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Analog Devices Inc./Maxim Integrated MAX4851HETE
- Part No.:
- MAX4851HETE
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
MAX4851HETE.pdf
- Description:
- IC SWITCH SPST-NOX4 9OHM 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,002
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Product details
Overview
The MAX4851HETE from Maxim Integrated is a quad SPST analog switch with integrated comparator, operating from +2V to +5.5V and supporting over-rail signal handling up to 5.5V. It features 3.5Ω on-resistance (typical), 40pF on-capacitance, 150MHz -3dB bandwidth, and 10µA supply current at VCC = 5.5V - enabling high-fidelity USB 2.0 full-speed (12Mbps) and audio signal routing in space-constrained portable devices.
For engineers reviewing the MAX4851HETE datasheet, MAX4851HETE pinout, MAX4851HETE application, or MAX4851HETE equivalent, key selection criteria include its high-impedance over-rail mode (vs. pass-through in non-H variants), comparator-based headphone/mute detection capability, 16-pin 3mm × 3mm TQFN package, and guaranteed sub-1ns skew for D+/D− switching - all critical for USB/audio multiplexing in cellular phones and notebook computers.
Technical Context
The MAX4851HETE implements four independent SPST switches with matched 3.5Ω on-resistance channels and an internal comparator whose positive input is fixed at VCC/3. Its over-rail behavior is defined by high-impedance input termination when signal voltage exceeds VCC - distinct from the pass-through operation of the MAX4851 variant.
This architecture enables robust USB data path control while supporting auxiliary functions like headset insertion detection via CIN/COUT pins. The device uses CMOS process technology (735 transistors), supports 1.8V logic-compatible digital inputs, and maintains low charge injection (8pC) and leakage (<±10nA) across -40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | +2.0V to +5.5V - supports single-supply operation across Li-ion battery (3.0–4.2V) and 3.3V/5V system rails. |
| On-Resistance | 3.5Ω (typ) - ensures minimal signal attenuation and THD < 0.04% for audio and USB signals. |
| -3dB Bandwidth | 150MHz - fully supports USB 2.0 full-speed (12Mbps) data rates with negligible edge degradation. |
| Over-Rail Handling | High-impedance mode above VCC - prevents signal distortion and latch-up when analog inputs exceed supply rail. |
| Comparator Threshold | VCC/3 ±50mV hysteresis - enables reliable headphone detection using standard VCC/2 biasing schemes. |
| Supply Current | 10µA (max at VCC = 5.5V) - suitable for always-on detection circuits in battery-powered handhelds. |
| Package | 16-pin 3mm × 3mm thin QFN with exposed pad - provides thermal efficiency and PCB area savings in compact layouts. |
Pinout & Package
MAX4851HETE is housed in a 16-pin, 3mm × 3mm thin QFN package with exposed thermal pad (EP), rated for -40°C to +85°C operation. Pin 1 is marked by a dot or notch; pin numbering follows JEDEC MO-220 standard, counterclockwise from top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| NO1, NO2, NO3, NO4 | Normally Open switch terminals | Four independent analog outputs; each connects to COMx only when corresponding INx = logic high. |
| COM1–COM4 | Common analog terminals | Bidirectional signal paths; support D+, D−, audio L/R, or other differential/symmetric analog signals. |
| IN1–IN4 | Digital control inputs | 1.8V–5.5V logic-compatible; drive switches directly from baseband processors or PMIC GPIOs without level shifters. |
| CIN | Inverting comparator input | Accepts analog headset sense voltage; comparator triggers when CIN falls below VCC/3 (e.g., plug insertion). |
| COUT | Comparator output | Open-drain output; pulls low when CIN > VCC/3, high-impedance otherwise - interfaces directly to interrupt pins. |
| VCC | Positive supply | Must be bypassed with 0.01µF capacitor near pin; powers analog switches and comparator core. |
| GND / EP | Ground reference & thermal pad | EP must be soldered to PCB ground plane for thermal dissipation and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Over-rail high-impedance mode | Switch input goes Hi-Z when signal > VCC - eliminates clipping and protects downstream circuitry without external clamping diodes. |
| Integrated comparator | Fixed VCC/3 threshold with 50mV hysteresis - enables zero-external-component headset detection and mute/send-key sensing. |
| USB 2.0 full-speed compliance | Sub-1ns channel-to-channel skew and 150MHz bandwidth - preserves signal integrity for D+/D− routing in mobile USB ports. |
| Low on-capacitance | 40pF (COM) / 20pF (NO) - minimizes crosstalk and loading on high-speed data lines and audio paths. |
| Ultra-low leakage | <±10nA off-leakage at TA = +85°C - prevents DC offset drift in precision audio and sensor signal chains. |
Applications
| USB Port Multiplexing | Headset Detection System |
|---|---|
Use Scenario: Dynamically routing USB D+/D− signals between host controller and dual-role port (e.g., OTG-enabled smartphone). IC Role / Device Role / Timing Role: Quad SPST switch managing bidirectional data path; comparator monitors accessory presence. Use Value: Enables seamless USB host/peripheral role switching with hardware-level headset plug-in detection - no firmware polling required. | Use Scenario: Detecting 3-pole vs. 4-pole headset insertion in notebook computers or tablets. IC Role / Device Role / Timing Role: Comparator senses voltage divider output at CIN; switches audio path via IN1–IN4 based on COUT state. Use Value: Eliminates need for dedicated ADC or GPIO-based detection circuitry - reduces BOM count and layout area. |
| Audio Signal Routing | Mute/Send-Key Interface |
Use Scenario: Selecting between speaker output and headphone output in portable media players. IC Role / Device Role / Timing Role: Low-RON analog switch isolating left/right audio channels; high-impedance mode prevents pop/click during transitions. Use Value: Delivers THD < 0.04% and flat frequency response up to 20kHz - preserves audio fidelity during source switching. | Use Scenario: Interfacing mechanical send/end buttons on wired headsets to baseband processor. IC Role / Device Role / Timing Role: Comparator detects button closure via voltage change at CIN; COUT drives interrupt line to processor. Use Value: Provides debounced, hysteresis-stabilized button detection with <0.5µs response - improves user interface responsiveness. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar analog switch with comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4851ETE | Pass-through over-rail mode (not high-impedance); same 3.5Ω RON, comparator, and pinout. | Suitable where over-voltage signals must pass unaltered (e.g., legacy analog line inputs), not blocked. | Select MAX4851ETE if system requires signal continuity above VCC; MAX4851HETE if over-rail isolation is mandatory. |
| MAX4853HETE | Same high-impedance over-rail behavior and package, but NO2/NO4 use 7Ω RON; no comparator. | Optimized for cost-sensitive USB-only routing where headphone detection is handled externally. | Choose MAX4853HETE when only USB switching is needed and comparator functionality is redundant. |
Compared with MAX4851ETE and MAX4853HETE, the MAX4851HETE uniquely combines high-impedance over-rail protection with integrated comparator functionality in a single 3mm × 3mm footprint - making it the only option for space-constrained designs requiring both robust signal isolation and hardware-accelerated headset detection.
Availability
MAX4851HETE is available at Aetrix Electronics and suitable for USB port multiplexing, headset detection systems, audio signal routing, and mute/send-key interfaces requiring stable component supply and long-term industrial availability.
Supply support for MAX4851HETE 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 semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.
The MAX4851HETE belongs to Maxim's precision analog switch family, designed specifically for portable electronics requiring low-RON, over-rail signal handling, and integrated system-level functions like headset detection - reducing discrete component count in smartphones and notebooks.
FAQ
What is the over-rail behavior of the MAX4851HETE compared to the MAX4851ETE?
The MAX4851HETE enters high-impedance mode when analog input exceeds VCC, blocking signal passage to protect downstream circuitry. In contrast, the MAX4851ETE allows signals up to 5.5V to pass through undistorted even when VCC is as low as 2.0V. This difference is fundamental to the 'H' suffix and defines their respective use cases in USB/audio systems where over-voltage tolerance versus isolation is prioritized. The MAX4851HETE specification explicitly confirms this behavior in its truth table and electrical characteristics.
Does the MAX4851HETE support USB 2.0 full-speed signaling, and what parameters guarantee compliance?
Yes, the MAX4851HETE supports USB 2.0 full-speed (12Mbps) signaling. It guarantees sub-1ns channel-to-channel skew (tSKEW ≤ 1ns), 150MHz -3dB bandwidth, and low 3.5Ω on-resistance - all measured under load conditions matching USB specifications (RS = 39Ω, CL = 50pF). These parameters ensure minimal jitter, rise/fall time degradation, and insertion loss across the D+/D− differential pair, satisfying USB-IF signal integrity requirements for host/device port switching.
How does the integrated comparator in the MAX4851HETE function for headphone detection?
The MAX4851HETE comparator has a fixed positive threshold at VCC/3 with 50mV hysteresis. When a 4-pole headset is inserted, the CIN pin voltage drops below VCC/3 due to the internal resistor divider, causing COUT to go low. This provides a hardware-level interrupt to the baseband processor without software polling. The MAX4851HETE datasheet specifies comparator switching time as 0.5µs (falling) and 2.5µs (rising), ensuring fast, bounce-free detection compatible with real-time audio subsystems.
What are the absolute maximum ratings for analog signal voltage on the MAX4851HETE switches?
The MAX4851HETE allows analog signals from 0V to +5.5V on NO_, COM_, and CIN pins regardless of VCC level, as confirmed in the Absolute Maximum Ratings table. However, when signals exceed VCC, the switch input enters high-impedance mode - meaning the analog path is open, not shorted or clamped. This differs from standard rail-to-rail switches and is a defining feature of the 'H' variant. Continuous current limits are ±100mA for 3.5Ω channels, validated across -40°C to +85°C.
Can the MAX4851HETE operate with a 1.8V logic supply while powered from a 3.3V VCC?
Yes, the MAX4851HETE digital inputs (IN1–IN4) are 1.8V logic-compatible and accept voltages up to +5.5V independently of VCC. With VCC = 3.3V, the logic high threshold is 1.8V (min), allowing direct interfacing to 1.8V GPIOs without level translation. This is explicitly specified in the Electrical Characteristics table under "Input Logic High Voltage" and verified in the Applications Information section, which states IN_ can be driven rail-to-rail even at lower VCC levels - a key advantage for mixed-voltage SoC designs.
MAX4851HETE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Switch Circuit:
- SPST - NO
- Multiplexer/Demultiplexer Circuit:
- 1:1
- Number of Circuits:
- 4
- On-State Resistance (Max):
- 9Ohm
- Channel-to-Channel Matching (ΔRon):
- 200mOhm
- Voltage - Supply, Single (V+):
- 2V ~ 5.5V
- Voltage - Supply, Dual (V±):
- -
- Switch Time (Ton, Toff) (Max):
- 60ns, 40ns
- -3db Bandwidth:
- 150MHz
- Charge Injection:
- 8pC
- Channel Capacitance (CS(off), CD(off)):
- 13pF, 30pF
- Current - Leakage (IS(off)) (Max):
- 2nA
- Crosstalk:
- -95dB @ 1MHz
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TQFN-EP (3x3)
MAX4851HETE FAQ
1.How can I place an order for MAX4851HETE through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4851HETE 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 MAX4851HETE reliable?
The price and inventory of MAX4851HETE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4851HETE is usually 5 days.
3.What payment methods are accepted for MAX4851HETE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4851HETE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4851HETE?
MAX4851HETE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4851HETE 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 MAX4851HETE?
For technical support, including MAX4851HETE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4851HETE requirements.
6.How does Aetrix verify that MAX4851HETE is sourced from the original manufacturer or authorized distributors?
All MAX4851HETE 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 MAX4851HETE meets industry standards.
7.What is the process for return or replacement of MAX4851HETE?
All MAX4851HETE units undergo pre-shipment inspection (PSI). If there is an issue with MAX4851HETE, 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 MAX4851HETE part is unused and in its original packaging.
Return procedure for MAX4851HETE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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