Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

Home > Products > Integrated Circuits (ICs) > Interface > Analog Switches, Multiplexers, Demultiplexers

Analog Devices Inc./Maxim Integrated MAX4745HELB+

Name: MAX4745HELB+
Brand: Analog Devices Inc./Maxim Integrated
SKU: MAX4745HELB+
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: MAX4745HELB+

Manufacturer:: Analog Devices Inc./Maxim Integrated

Category:: Analog Switches, Multiplexers, Demultiplexers

Package:: 10-WFDFN

Datasheet:: MAX4745HELB+.pdf

Description:: IC SWITCH SPDTX2 950MOHM 10UDFN

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:4,355

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

MAX4745HELB+ from Maxim Integrated is a dual SPDT audio switch IC with negative rail capability (V_COM down to V_CC − 5.5V), 0.6Ω typical on-resistance, −68dB off-isolation at 100kHz, and integrated COM protection for V_CC = 0V operation-designed for speaker switching and audio path routing in handheld devices.

For engineers reviewing the MAX4745HELB+ datasheet, MAX4745HELB+ pinout, MAX4745HELB+ application, or MAX4745HELB+ equivalent, key selection criteria include its single-supply 1.8V–5.5V operation, break-before-make timing (20ns), click/pop suppression architecture, and 10-pin µDFN (2mm × 2mm) package compatibility with space-constrained portable audio designs.

Technical Context

The MAX4745HELB+ implements a dual independent SPDT analog switch topology with bidirectional signal handling and rail-to-rail analog range from V_CC − 5.5V to V_CC. It uses BiCMOS process technology to achieve low on-resistance flatness (0.55Ω max) and tight channel-to-channel matching (0.1Ω max).

Unlike the MAX4744H/MAX4745H variants with shared CB0 control and EN enable, the MAX4745HELB+ retains the two-bit CB1/CB2 control scheme of the MAX4745 family but adds the V_CC = 0V COM protection network found only in H-suffix parts-making it functionally distinct from non-H MAX4745 variants.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	+1.8V to +5.5V single supply-enables direct interface with Li-ion battery systems and 3.3V/5V logic without level shifters.
Analog Range	V_COM, V_NO, V_NC = V_CC − 5.5V to V_CC-supports true bipolar audio signals including sub-ground swing without clipping or distortion.
On-Resistance	0.6Ω typical at V_CC = 2.7V-minimizes insertion loss and thermal drift in high-fidelity audio paths.
Off-Isolation	−68dB typical at 100kHz-prevents audible crosstalk between active and inactive audio channels.
Break-Before-Make Delay	20ns-ensures no momentary short between NC and NO paths during switching, critical for pop-free speaker routing.
COM Protection	Active when V_CC < 0.5V-allows safe hot-plug of audio signals before power-up, preventing latch-up or ESD damage.
Total Harmonic Distortion	0.01% typical (20Hz–20kHz)-meets high-fidelity requirements for MP3 players and notebook audio subsystems.

Pinout & Package

The MAX4745HELB+ is housed in a 10-pin µDFN package (2mm × 2mm × 0.8mm, pkg code L1022-1) with wettable flanks and exposed pad for thermal performance. Pin 1 is marked by a dot or laser etch in the top-left corner per JEDEC MO-229.

Pin/Terminal	Circuit Role	Design Meaning
1	CB1	Digital control input for Switch 1-driven high/low to select NC1 or NO1 connection to COM1.
2	NO1	Normally open terminal of Switch 1-connects to COM1 only when CB1 = 1, used for alternate audio source routing.
3	GND	Analog/digital ground reference-must be low-impedance and tied directly to system ground plane to minimize THD.
4	NO2	Normally open terminal of Switch 2-provides second independent audio path selection synchronized with CB2.
5	CB2	Digital control input for Switch 2-determines NO2/NC2 connection to COM2 independently of CB1.
6	COM2	Common terminal of Switch 2-serves as bidirectional audio I/O node routed to either NO2 or NC2 based on CB2 state.
7	NC2	Normally closed terminal of Switch 2-maintains default audio path to COM2 until CB2 asserts high.
8	VCC	Positive supply input-must be bypassed with ≥1µF ceramic capacitor near pin to suppress PSRR degradation.
9	NC1	Normally closed terminal of Switch 1-provides default audio path to COM1 until CB1 asserts high.
10	COM1	Common terminal of Switch 1-bidirectional node connecting to amplifier output or speaker driver stage.

Key Features

Feature	Design Value
Negative rail capability	Supports analog signals down to V_CC − 5.5V-enables seamless integration with op-amps and codecs operating below ground.
Break-before-make switching	20ns guaranteed delay prevents transient shorting between NC and NO paths-eliminates audible pops during speaker switching.
V_CC = 0V COM protection	Leakage current ≤500nA when V_CC = 0V and V_COM = +5.5V-protects against improper power sequencing in battery-backed systems.
Low THD and crosstalk	0.01% THD and −75dB crosstalk at 100kHz-preserves signal integrity in stereo headphone and line-out applications.
Single-supply flexibility	Operates from 1.8V to 5.5V-compatible with modern low-voltage SoCs and legacy 5V peripherals without external regulators.

Applications

Speaker Switching	Power Routing
Use Scenario: Dynamically selecting between internal speaker and external headset in a smartphone during call handover. IC Role / Device Role / Timing Role: Dual SPDT switch routing amplified audio from baseband processor to either speaker or headset jack, controlled by AP GPIOs. Use Value: Eliminates mechanical relays; enables silent transition using break-before-make timing and COM protection during battery hot-swap.	Use Scenario: Isolating auxiliary power domains (e.g., USB VBUS and battery charger output) in a tablet's PMIC subsystem. IC Role / Device Role / Timing Role: Bidirectional analog switch managing power-path selection under firmware control, leveraging negative rail tolerance for voltage monitoring circuits. Use Value: Replaces discrete MOSFET solutions with lower BOM count, tighter R_ON matching, and guaranteed 20ns break-before-make timing.
Cellular Phones	MP3 Players
Use Scenario: Routing microphone bias and audio signals between main mic, secondary mic, and noise-cancellation circuitry in LTE handsets. IC Role / Device Role / Timing Role: Dual SPDT switch providing low-distortion, low-leakage signal path selection with sub-50nA off-leakage at −2.5V. Use Value: Maintains SNR >95dB across full audio band while supporting V_CC = 0V hot-plug of mic accessories.	Use Scenario: Selecting between line-in, DAC output, and headphone amplifier in portable music players with dual-output capability. IC Role / Device Role / Timing Role: Audio path manager enabling simultaneous playback and recording via independent COM1/COM2 routing. Use Value: Achieves 0.01% THD and −68dB off-isolation to prevent inter-channel bleed in high-resolution audio playback.

Speaker Switching

Power Routing

Use Scenario: Dynamically selecting between internal speaker and external headset in a smartphone during call handover.

IC Role / Device Role / Timing Role: Dual SPDT switch routing amplified audio from baseband processor to either speaker or headset jack, controlled by AP GPIOs.

Use Value: Eliminates mechanical relays; enables silent transition using break-before-make timing and COM protection during battery hot-swap.

Use Scenario: Isolating auxiliary power domains (e.g., USB VBUS and battery charger output) in a tablet's PMIC subsystem.

IC Role / Device Role / Timing Role: Bidirectional analog switch managing power-path selection under firmware control, leveraging negative rail tolerance for voltage monitoring circuits.

Use Value: Replaces discrete MOSFET solutions with lower BOM count, tighter R_ON matching, and guaranteed 20ns break-before-make timing.

Cellular Phones

MP3 Players

Use Scenario: Routing microphone bias and audio signals between main mic, secondary mic, and noise-cancellation circuitry in LTE handsets.

IC Role / Device Role / Timing Role: Dual SPDT switch providing low-distortion, low-leakage signal path selection with sub-50nA off-leakage at −2.5V.

Use Value: Maintains SNR >95dB across full audio band while supporting V_CC = 0V hot-plug of mic accessories.

Use Scenario: Selecting between line-in, DAC output, and headphone amplifier in portable music players with dual-output capability.

IC Role / Device Role / Timing Role: Audio path manager enabling simultaneous playback and recording via independent COM1/COM2 routing.

Use Value: Achieves 0.01% THD and −68dB off-isolation to prevent inter-channel bleed in high-resolution audio playback.

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual SPDT audio switch applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MAX4744HELB+	Includes internal shunt resistors on NO/NC pins for automatic capacitance discharge; MAX4745HELB+ lacks shunts.	Preferred where click/pop suppression is mandatory (e.g., speaker switching); MAX4745HELB+ requires external RC networks.	Select MAX4744HELB+ if shunt-based pop suppression is required; MAX4745HELB+ offers identical COM protection and control logic.
TS5A23157DCUR	Lower on-resistance (0.55Ω typ) but no V_CC = 0V COM protection; operates down to 1.65V supply.	Suitable for low-voltage portable designs without hot-plug requirements; lacks MAX4745HELB+'s −68dB off-isolation.	Choose TS5A23157DCUR for cost-sensitive 1.8V systems without V_CC sequencing concerns; retain MAX4745HELB+ for robust industrial audio routing.

Compared with MAX4744HELB+, the MAX4745HELB+ trades shunt-based click/pop suppression for identical COM protection and dual-bit control-making it optimal for firmware-controlled multi-source routing where external discharge is acceptable. Against TS5A23157DCUR, it delivers superior off-isolation and sequencing safety at the cost of slightly higher R_ON.

Availability

MAX4745HELB+ is available at Aetrix Electronics and suitable for cellular phones, MP3 players, and notebook computers requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.

Supply support for MAX4745HELB+ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Maxim Integrated (now part of Analog Devices) is a U.S.-based semiconductor company specializing in precision analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.

The MAX4744/MAX4745 family was designed specifically for low-distortion, low-power audio signal routing in portable electronics-emphasizing negative rail capability, pop-free switching, and compact packaging for space-constrained designs.

FAQ

What is the maximum allowable analog signal voltage on COM1/COM2 for MAX4745HELB+ when VCC = 3.3V?

The MAX4745HELB+ supports analog signals from V_CC − 5.5V to V_CC on all COM, NO, and NC terminals. At V_CC = 3.3V, this translates to −2.2V to +3.3V. Exceeding these limits risks forward-biasing internal clamping diodes and violating absolute maximum ratings-always ensure external signal sources respect this range to maintain 0.01% THD performance in the MAX4745HELB+.

Does MAX4745HELB+ support break-before-make timing, and what is its guaranteed value?

Yes, the MAX4745HELB+ guarantees a break-before-make delay time (t_D) of 20ns under specified conditions (V_CC = 2.7V, R_L = 32Ω, C_L = 35pF). This timing ensures the NC path opens fully before the NO path closes, eliminating transient shorts that cause audible pops-critical for speaker switching applications where the MAX4745HELB+ is deployed.

How does the COM protection feature of MAX4745HELB+ behave when VCC is ramping from 0V to nominal voltage?

The MAX4745HELB+ COM protection activates when V_CC < 0.5V, limiting leakage current to ≤500nA even with +5.5V applied to COM pins. As V_CC rises above 0.5V, protection deactivates and standard absolute maximum ratings apply. This behavior allows safe hot-plug of audio accessories before system power-up-a key reliability feature distinguishing the MAX4745HELB+ from non-H variants.

Can MAX4745HELB+ be used with 5V logic control signals while operating from a 1.8V supply?

Yes, the MAX4745HELB+ digital inputs (CB1, CB2) accept logic-high voltages up to +5.5V regardless of V_CC level. When V_CC = 1.8V, driving CB1/CB2 to 5V is permissible and does not damage the device-the internal input structure is overvoltage-tolerant. This simplifies interfacing with mixed-voltage systems and eliminates level-shifters in designs using the MAX4745HELB+.

What is the thermal resistance θ_JA of the MAX4745HELB+ in its 10-pin µDFN package?

The MAX4745HELB+ in the 10-pin µDFN (2mm × 2mm) package has a junction-to-ambient thermal resistance (θ_JA) of 248°C/W, calculated from its 403mW maximum power dissipation at T_A = +70°C and 5mW/°C derating above that temperature. Proper PCB layout-including a solid thermal pad connected to ≥4 thermal vias-is essential to maintain junction temperature within −40°C to +85°C operating range for reliable MAX4745HELB+ operation.

MAX4745HELB+ Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc./Maxim Integrated

Series:: -

Packaging:: Tube

Product Status:: Obsolete

Switch Circuit:: SPDT

Multiplexer/Demultiplexer Circuit:: 2:1

Number of Circuits:: 2

On-State Resistance (Max):: 950mOhm

Channel-to-Channel Matching (ΔRon):: 100mOhm (Max)

Voltage - Supply, Single (V+):: 1.8V ~ 5.5V

Voltage - Supply, Dual (V±):: -

Switch Time (Ton, Toff) (Max):: 560ns, 450ns

-3db Bandwidth:: 25MHz

Charge Injection:: 550pC

Channel Capacitance (CS(off), CD(off)):: 90pF, 90pF

Current - Leakage (IS(off)) (Max):: -

Crosstalk:: -75dB @ 100kHz

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 10-µDFN (2x2)

MAX4745HELB+ FAQ

1.How can I place an order for MAX4745HELB+ through Aetrix?

Please submit a Request for Quotation (RFQ) for MAX4745HELB+ on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for MAX4745HELB+ reliable?

The price and inventory of MAX4745HELB+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4745HELB+ is usually 5 days.

3.What payment methods are accepted for MAX4745HELB+?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4745HELB+ transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MAX4745HELB+?

MAX4745HELB+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MAX4745HELB+ order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for MAX4745HELB+?

For technical support, including MAX4745HELB+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4745HELB+ requirements.

6.How does Aetrix verify that MAX4745HELB+ is sourced from the original manufacturer or authorized distributors?

All MAX4745HELB+ products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MAX4745HELB+ meets industry standards.

7.What is the process for return or replacement of MAX4745HELB+?

All MAX4745HELB+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX4745HELB+, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The MAX4745HELB+ part is unused and in its original packaging.

Return procedure for MAX4745HELB+:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

Tech Hub

2026-09-03 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-01 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…

2026-08-14 Jumper Cables: How to Use, Connect and Choose Them Safely

Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…