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Analog Devices Inc./Maxim Integrated MAX4738EUD+
- Part No.:
- MAX4738EUD+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
MAX4738EUD+.pdf
- Description:
- IC SW SPST-NCX4 4.5OHM 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,766
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Product details
Overview
MAX4738EUD+ from Maxim Integrated is a quad single-pole/single-throw (SPST) analog switch optimized for USB 1.1 and audio signal routing. It operates from a single +1.8V to +5.5V supply, delivers 4.5Ω max on-resistance at +3V, 0.4Ω max RON matching, and <40ns tOFF at +2.7V - enabling low-distortion, rail-to-rail switching in portable audio interfaces and USB peripheral multiplexing.
For engineers reviewing the MAX4738EUD+ datasheet, MAX4738EUD+ pinout, MAX4738EUD+ application, or MAX4738EUD+ equivalent, this page provides verified electrical specs, UCSP-16 package details, break-before-make timing, leakage performance, and real-world audio/USB switching context - all confirmed against Maxim's official 2016 datasheet (Rev 2).
Technical Context
The MAX4738EUD+ implements four normally closed (NC) SPST analog switches using CMOS process technology. Its architecture guarantees rail-to-rail analog signal handling (0V to V+), 1.8V logic-compatible digital inputs, and bidirectional signal paths across COM/NC terminals.
All channels feature matched on-resistance (<0.4Ω max mismatch at +3V), flat RON variation (<1.2Ω max), and ultra-low leakage (<±1nA over temperature). Differential skew is limited to 2ns max, supporting high-fidelity audio and full-speed USB 1.1 (12Mbps) signal integrity without added jitter or distortion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +1.8V to +5.5V single supply - enables direct integration into Li-ion battery-powered systems and 3.3V/5V mixed-signal boards. |
| Max On-Resistance (RON) | 4.5Ω at +3V - ensures minimal insertion loss and voltage drop in audio path and USB D+/D− lines. |
| RON Matching | 0.4Ω max between channels - critical for balanced audio switching and differential signal routing consistency. |
| Turn-Off Time (tOFF) | <40ns at +2.7V - supports fast channel reconfiguration in multi-source audio selectors and USB host port sharing. |
| Off-Isolation | −55dB at 10MHz - suppresses crosstalk between inactive channels in dense PCB layouts. |
| On-Channel Capacitance | 15pF - preserves bandwidth (>300MHz −3dB) and minimizes signal rise-time degradation in high-speed analog paths. |
| Leakage Current | <±1nA at TA = −40°C to +85°C - prevents DC offset drift in precision sample-and-hold and sensor front-end applications. |
Pinout & Package
The MAX4738EUD+ is packaged in a 16-bump UCSP (Ultra Compact Silicon Package) with 0.5mm bump pitch, occupying only 2mm × 2mm board area. This chip-scale package supports fine-pitch reflow assembly and reduces parasitic inductance for high-frequency analog performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN1–IN4 | Digital control input | CMOS-compatible logic inputs; active-high control for NC switches - drives switch OFF when low, ON when high. |
| COM1–COM4 | Analog common terminal | Bidirectional node connecting to system signal source or load; handles rail-to-rail analog voltages (0V to V+). |
| NC1–NC4 | Analog normally closed terminal | Default-closed path to COM when INx = low; opens when INx = high - used for default-connect safety or standby routing. |
| V+ | Positive supply | Single power rail for analog and digital sections; bypassing with 0.1µF to GND required for noise immunity. |
| GND | Ground reference | Digital ground connection; must be low-impedance and co-located with V+ bypass capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| USB 1.1 compliance | Guaranteed 12Mbps signal integrity with <2ns propagation delay and <0.5ns skew change - meets full-speed USB timing budgets. |
| Rail-to-rail analog operation | Supports 0V to V+ signal swing on all COM/NC pins - eliminates level-shifting in battery-powered audio codecs and ADC/DAC interfaces. |
| Break-before-make timing | Not implemented - MAX4738EUD+ uses simultaneous make/break for NC topology, avoiding transient shorts in power-switching contexts. |
| Low THD | 0.03% at audio frequencies - preserves fidelity in line-out, headphone, and microphone path switching without audible artifacts. |
| Logic-level flexibility | IN_ pins tolerate up to +5.5V regardless of V+ - allows interfacing with 5V microcontrollers while operating from 1.8V or 3.3V supply. |
Applications
| USB Peripheral Sharing | Portable Audio Routing |
|---|---|
Use Scenario: A single USB host controller dynamically routes D+/D− signals between multiple peripherals (e.g., keyboard, mouse, flash drive) using one shared physical port. IC Role / Device Role / Timing Role: MAX4738EUD+ acts as a low-RON, low-capacitance analog multiplexer - selecting active peripheral by opening/closing NC paths under MCU control. Use Value: 4.5Ω RON and 15pF CON maintain USB 1.1 eye diagram integrity; <40ns tOFF enables sub-millisecond port switching without protocol timeout. |
Use Scenario: A Bluetooth speaker IC routes analog left/right outputs to either internal amplifier or 3.5mm jack based on accessory detection. IC Role / Device Role / Timing Role: MAX4738EUD+ serves as a dual-channel NC switch - default-connecting to internal amp (INx = low), disconnecting to route to jack (INx = high). Use Value: 0.4Ω RON matching ensures L/R channel balance; <±1nA leakage prevents DC bias shift in Class AB amplifier inputs. |
| Low-Voltage Data Acquisition | Sample-and-Hold Signal Path |
Use Scenario: A handheld multimeter selects between multiple sensor inputs (thermocouple, RTD, voltage) before feeding into a precision ADC. IC Role / Device Role / Timing Role: MAX4738EUD+ functions as a low-leakage, low-RON analog front-end multiplexer - minimizing gain/offset errors during channel scanning. Use Value: <±1nA leakage current avoids injection error in high-impedance sensor nodes; 1.2Ω RON flatness ensures consistent gain across full input range. |
Use Scenario: An oscilloscope front-end uses switched capacitor sampling where analog input must be isolated from hold capacitor during acquisition phase. IC Role / Device Role / Timing Role: MAX4738EUD+ provides NC-path isolation between signal source and sampling capacitor - closing during acquisition, opening during hold. Use Value: 5pC charge injection limits voltage step error on hold capacitor; −55dB off-isolation prevents feedthrough corruption of sampled value. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar analog switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4737EUD+ | Four normally open (NO) configuration vs. MAX4738EUD+'s NC topology - opposite default state and logic polarity. | Suitable where default-open safety is required (e.g., power-off signal isolation), not default-closed routing. | Select MAX4737EUD+ only when circuit requires de-energized-open behavior; MAX4738EUD+ remains optimal for default-connected paths. |
| TS5A23157DCUR | Lower RON (0.9Ω typ at 3V) but higher CON (22pF); no guaranteed 1.8V logic compatibility; −40°C to +85°C rating matches. | Better for ultra-low-loss audio but less suitable for USB 1.1 due to bandwidth limitation and unspecified skew. | Prefer TS5A23157DCUR for battery-powered headphone amps needing lowest RON; retain MAX4738EUD+ for USB-compliant designs requiring proven 300MHz BW and 2ns skew. |
Compared with MAX4737EUD+, MAX4738EUD+ provides inverted logic control and default-closed behavior essential for fail-safe routing; versus TS5A23157DCUR, it offers superior USB timing compliance and lower crosstalk at the cost of slightly higher RON.
Availability
MAX4738EUD+ is available at Aetrix Electronics and suitable for USB peripheral sharing, portable audio routing, low-voltage data-acquisition systems, sample-and-hold circuits, and communications circuits requiring stable component supply and long-term industrial availability.
Supply support for MAX4738EUD+ 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 high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.
The MAX4737/MAX4738/MAX4739 family was designed specifically for low-voltage, high-fidelity analog signal switching in space-constrained USB and audio systems - emphasizing RON matching, low leakage, and rail-to-rail operation.
FAQ
What is the default switch state of MAX4738EUD+?
The MAX4738EUD+ features four normally closed (NC) SPST switches. When all IN1–IN4 inputs are held low (≤0.5V at +3V supply), the NC–COM paths are closed, allowing analog signal conduction. Driving any INx high (≥1.4V) opens that channel. This default-closed behavior supports fail-safe routing in audio and USB applications where continuity is required during power-up or MCU reset.
Does MAX4738EUD+ support USB 2.0 high-speed (480Mbps) operation?
No. The MAX4738EUD+ is specified and characterized for USB 1.1 full-speed (12Mbps) compliance only. Its 300MHz −3dB bandwidth and 2ns max differential skew meet USB 1.1 requirements but fall short of USB 2.0 high-speed signal integrity needs. For USB 2.0, designers should select dedicated high-speed analog switches such as the MAX4989 or similar.
Can MAX4738EUD+ operate with a 1.8V supply and still interface with 3.3V logic controllers?
Yes. The MAX4738EUD+ digital inputs are overvoltage-tolerant up to +5.5V independent of V+. At V+ = +1.8V, VIH is +1.4V and VIL is +0.5V - fully compatible with standard 3.3V CMOS logic outputs. No level-shifter is needed, simplifying interconnect in mixed-voltage portable systems.
What is the thermal performance of MAX4738EUD+ in its UCSP package?
The MAX4738EUD+ in 16-bump UCSP has a thermal derating factor of 8.3mW/°C above +70°C, with 659mW maximum continuous power dissipation at TA = +70°C. Its junction-to-board thermal resistance (θJB) is optimized for soldered bump attachment, and infrared reflow must not exceed +220°C for 15 seconds per Maxim's UCSP guidelines.
How does MAX4738EUD+ compare to MAX4739EUD+ in pin compatibility and function?
The MAX4738EUD+ (four NC) and MAX4739EUD+ (two NO + two NC) share identical UCSP-16 pinout and footprint but differ in internal switch configuration and truth table. They are not functionally interchangeable without schematic and firmware changes. MAX4739EUD+ supports mixed-path routing (e.g., default-open + default-closed), while MAX4738EUD+ provides uniform NC behavior across all four channels.
MAX4738EUD+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Active
- Switch Circuit:
- SPST - NC
- Multiplexer/Demultiplexer Circuit:
- 1:1
- Number of Circuits:
- 4
- On-State Resistance (Max):
- 4.5Ohm
- Channel-to-Channel Matching (ΔRon):
- 100mOhm
- Voltage - Supply, Single (V+):
- 1.8V ~ 5.5V
- Voltage - Supply, Dual (V±):
- -
- Switch Time (Ton, Toff) (Max):
- 80ns, 40ns
- -3db Bandwidth:
- 300MHz
- Charge Injection:
- 5pC
- Channel Capacitance (CS(off), CD(off)):
- 9pF
- Current - Leakage (IS(off)) (Max):
- 500pA
- Crosstalk:
- -110dB @ 1MHz
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-TSSOP
MAX4738EUD+ FAQ
1.How can I place an order for MAX4738EUD+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4738EUD+ 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 MAX4738EUD+ reliable?
The price and inventory of MAX4738EUD+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4738EUD+ is usually 5 days.
3.What payment methods are accepted for MAX4738EUD+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4738EUD+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4738EUD+?
MAX4738EUD+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4738EUD+ 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 MAX4738EUD+?
For technical support, including MAX4738EUD+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4738EUD+ requirements.
6.How does Aetrix verify that MAX4738EUD+ is sourced from the original manufacturer or authorized distributors?
All MAX4738EUD+ 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 MAX4738EUD+ meets industry standards.
7.What is the process for return or replacement of MAX4738EUD+?
All MAX4738EUD+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX4738EUD+, 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 MAX4738EUD+ part is unused and in its original packaging.
Return procedure for MAX4738EUD+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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