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Analog Devices Inc./Maxim Integrated MAX4781EGE
- Part No.:
- MAX4781EGE
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-VQFN Exposed Pad
- Datasheet:
-
MAX4781EGE.pdf
- Description:
- IC SWITCH SP8TX1 1OHM 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:8,658
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Product details
Overview
MAX4781EGE from Maxim Integrated is an 8-channel CMOS analog multiplexer operating from +1.6V to +3.6V, delivering 1Ω max on-resistance at +3V supply, 0.4Ω max RON matching, and rail-to-rail signal handling. It supports fast switching (tON = 25ns, tOFF = 15ns) with <3µW quiescent power, targeting low-voltage data-acquisition and audio routing in space-constrained portable systems.
For engineers reviewing the MAX4781EGE datasheet, MAX4781EGE pinout, MAX4781EGE application, or MAX4781EGE equivalent, this device serves as a high-speed, low-RON analog switch for battery-powered instrumentation, precision sensor interfaces, and compact audio signal path management where supply headroom is limited to ≤3.6V.
Technical Context
The MAX4781EGE implements an 8:1 single-pole multiplexer architecture controlled by three address lines (A, B, C) and an active-high ENABLE input. All analog I/O pins (X0–X7, X) are bidirectional and support rail-to-rail voltage swing from GND to VCC, with internal ESD diodes clamping signals beyond supply rails.
Its CMOS switch core delivers flat on-resistance (<0.2Ω max flatness), minimal charge injection (−110pC), and low off-capacitance (38pF), enabling high-fidelity signal routing up to 50MHz with −90dB off-isolation at 1MHz and −80dB crosstalk between adjacent channels.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-resistance (RON) | 1Ω max at +3V supply - ensures minimal signal attenuation and gain error in precision analog paths |
| RON matching | 0.4Ω max between channels - enables accurate channel-to-channel signal comparison in multiplexed ADC front-ends |
| Supply range | +1.6V to +3.6V single supply - compatible with Li-ion, Li-poly, and dual-cell alkaline battery systems |
| Switching speed | tON = 25ns, tOFF = 15ns - supports high-throughput data acquisition at >10 MSPS effective sampling rates |
| Analog bandwidth | 50MHz flat response - preserves signal integrity for audio, ultrasound, and baseband communication signals |
| Off-isolation | −90dB at 1MHz - prevents leakage-induced crosstalk in multi-signal monitoring applications |
| Quiescent current | <3µW total - extends battery life in always-on sensor nodes and portable medical devices |
Pinout & Package
MAX4781EGE is housed in a 4mm × 4mm, 16-pin QFN package with exposed thermal pad (pin 16 = VCC, pin 6 = GND, pin 5 = N.C.). Pin numbering follows standard QFN top-view layout with pin 1 at bottom-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| X0–X7 | Analog inputs | Eight bidirectional analog terminals selectable via A/B/C address lines; support rail-to-rail signal routing |
| X | Analog output/common | Single bidirectional common terminal - connects to selected Xn channel when ENABLE = low |
| A, B, C | Digital address inputs | 3-bit binary select lines determining which of X0–X7 connects to X; logic thresholds scale with VCC |
| ENABLE | Global enable control | Active-high input; drives all switches open (high-Z) when high - enables system-level power gating |
| VCC | Positive supply | Single analog/digital supply pin; powers internal CMOS switches and logic; must be decoupled locally |
| GND | Ground reference | Analog and digital ground return; ties internal ESD diode cathodes/anodes and substrate bias |
| N.C. | No connection | Internally unconnected pin - must remain floating; no external tie required or recommended |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail analog operation | Supports full VCC–GND signal swing without clipping - eliminates level-shifting in low-voltage sensor interfaces |
| Low on-resistance flatness | 0.2Ω max variation across signal range - maintains consistent gain and linearity in variable-amplitude signal paths |
| Break-before-make timing | 2ns guaranteed - prevents momentary shorting during channel transitions in critical safety or measurement circuits |
| CMOS logic compatibility | +1.8V logic threshold at +3V supply - interoperates directly with 1.8V/3.3V microcontrollers and FPGAs |
| Pin compatibility | Matches 74HC4051 and MAX4617 footprints - allows drop-in replacement in existing TSSOP layouts with QFN adapter |
Applications
| Battery-Powered Data Loggers | Portable Audio Signal Routing |
|---|---|
Use Scenario: Multiplexing outputs from 8 temperature, pressure, and humidity sensors into a single ADC channel in handheld environmental monitors. IC Role / Device Role / Timing Role: 8:1 analog multiplexer providing channel selection under MCU GPIO control with sub-30ns switching. Use Value: Enables high-resolution sensor fusion within 3.3V supply constraints while maintaining <0.5% gain error across channels due to tight RON matching. |
Use Scenario: Routing microphone, line-in, and headphone output signals in Bluetooth earbuds with dynamic path reconfiguration. IC Role / Device Role / Timing Role: Bidirectional analog switch managing signal direction and source selection without external amplifiers. Use Value: Delivers <−90dB off-isolation to prevent mic bleed into audio playback and preserves THD <0.045% across 20Hz–20kHz band. |
| Low-Voltage Medical Sensors | Industrial Fieldbus Interface Modules |
Use Scenario: Isolating and selecting ECG, EMG, and pulse oximetry analog front-ends in wearable diagnostic patches. IC Role / Device Role / Timing Role: Precision analog multiplexer with ultra-low leakage (<7nA off-state) minimizing DC offset drift in biopotential amplifiers. Use Value: Ensures baseline stability over 8-hour continuous monitoring by limiting input bias current contribution to <100nV error at 1MΩ source impedance. |
Use Scenario: Switching between multiple RS-485 transceiver outputs onto a shared differential bus in modular PLC backplanes. IC Role / Device Role / Timing Role: High-speed analog switch enabling hot-swappable communication port selection without bus contention. Use Value: Achieves 25ns turn-on time to minimize bus arbitration latency and supports ±150mA continuous current for robust fault-tolerant signaling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar analog multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4781EUE | TSSOP-16 package (4.4mm × 5mm); identical electrical specs and pinout; 457mW max power dissipation vs. 1481mW for QFN | Better suited for through-hole prototyping or legacy PCBs with TSSOP land patterns; lower thermal performance in high-density layouts | Select MAX4781EUE when board assembly uses TSSOP footprint or requires manual soldering accessibility |
| ADG1408BRUZ | ±15V dual-supply capable; 0.6Ω RON at ±15V; higher 125ns tON; 24-lead TSSOP; not pin-compatible | Targets industrial test equipment requiring bipolar signal handling; incompatible with 1.8V logic control without level shifters | Choose ADG1408BRUZ only when bipolar rail-to-rail operation or higher voltage tolerance (>3.6V) is mandatory |
Compared with MAX4781EUE, the MAX4781EGE offers superior thermal performance and smaller footprint for high-density portable designs, while ADG1408BRUZ trades speed and low-voltage compatibility for extended voltage range - neither is a pin-for-pin replacement but both serve overlapping analog routing functions.
Availability
MAX4781EGE is available at Aetrix Electronics and suitable for battery-operated equipment, audio signal routing, and low-voltage data-acquisition systems requiring stable component supply across automotive, industrial, and medical product lifecycles.
Supply support for MAX4781EGE 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) designs precision analog, mixed-signal, and power-management ICs for demanding industrial, medical, and communications applications.
The MAX4781EGE belongs to Maxim's high-speed analog switch/multiplexer family, engineered specifically for low-voltage, low-RON, rail-to-rail signal routing in portable and energy-sensitive systems.
FAQ
What is the maximum analog signal voltage range supported by the MAX4781EGE?
The MAX4781EGE supports rail-to-rail analog signals from GND to VCC. With a +3.6V supply, this means 0V to +3.6V. Signals exceeding VCC or falling below GND are clamped by internal ESD diodes, so the absolute maximum analog input is limited to −0.3V to (VCC + 0.3V). Operation outside the rail-to-rail range risks forward-biasing protection diodes and increasing leakage.
Does the MAX4781EGE require external pull-up or pull-down resistors on its address lines A, B, C?
No, the MAX4781EGE does not require external pull-up or pull-down resistors on A, B, or C. Its digital inputs have CMOS-compatible thresholds (VIH = 1.4V, VIL = 0.5V at +3V supply) and exhibit <1µA leakage, allowing direct connection to microcontroller GPIOs. However, if left floating during power-up, undefined channel selection may occur - best practice is to initialize these lines in firmware or use weak internal MCU pulls.
Can the MAX4781EGE be used with a +1.8V supply, and how does performance change?
Yes, the MAX4781EGE operates down to +1.6V and is fully specified at +1.8V. At +1.8V, RON increases to 3.5Ω max (vs. 1Ω at +3V), tON/tOFF extend to 32ns/22ns, and logic thresholds adjust to VIH = 1.0V/VIL = 0.4V. All functionality remains intact, making it viable for ultra-low-power applications where speed and on-resistance trade-offs are acceptable.
Is the ENABLE pin of the MAX4781EGE active-high or active-low?
The ENABLE pin of the MAX4781EGE is active-high. When ENABLE is driven logic high, all internal switches open (high-impedance state), disconnecting X from X0–X7. When ENABLE is logic low, the selected channel (determined by A/B/C) connects X to the corresponding Xn. The datasheet specifies "drive to logic high to set all switches off", confirming active-high behavior.
What is the thermal pad connection requirement for the MAX4781EGE QFN package?
The MAX4781EGE QFN package includes an exposed thermal pad (EP) that must be soldered to a PCB copper pour tied to GND for optimal thermal performance and EMI suppression. The datasheet specifies 1481mW max power dissipation with proper thermal relief; omitting EP connection reduces safe operating area by >60% and risks junction overheating above 70°C ambient. Use 9 thermal vias (0.3mm diameter) under the pad.
MAX4781EGE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Switch Circuit:
- SP8T - Open/Closed
- Multiplexer/Demultiplexer Circuit:
- 8:1
- Number of Circuits:
- 1
- On-State Resistance (Max):
- 1Ohm
- Channel-to-Channel Matching (ΔRon):
- 300mOhm
- Voltage - Supply, Single (V+):
- 1.6V ~ 3.6V
- Voltage - Supply, Dual (V±):
- -
- Switch Time (Ton, Toff) (Max):
- 25ns, 15ns
- -3db Bandwidth:
- -
- Charge Injection:
- -110pC
- Channel Capacitance (CS(off), CD(off)):
- 38pF, 310pF
- Current - Leakage (IS(off)) (Max):
- 2nA
- Crosstalk:
- -65dB @ 10MHz
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (4x4)
MAX4781EGE FAQ
1.How can I place an order for MAX4781EGE through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4781EGE 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 MAX4781EGE reliable?
The price and inventory of MAX4781EGE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4781EGE is usually 5 days.
3.What payment methods are accepted for MAX4781EGE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4781EGE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4781EGE?
MAX4781EGE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4781EGE 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 MAX4781EGE?
For technical support, including MAX4781EGE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4781EGE requirements.
6.How does Aetrix verify that MAX4781EGE is sourced from the original manufacturer or authorized distributors?
All MAX4781EGE 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 MAX4781EGE meets industry standards.
7.What is the process for return or replacement of MAX4781EGE?
All MAX4781EGE units undergo pre-shipment inspection (PSI). If there is an issue with MAX4781EGE, 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 MAX4781EGE part is unused and in its original packaging.
Return procedure for MAX4781EGE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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