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Analog Devices Inc./Maxim Integrated MAX4257ESA+T
- Part No.:
- MAX4257ESA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX4257ESA+T.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,908
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Product details
Overview
MAX4257ESA+T from Analog Devices is a single-supply, rail-to-rail output operational amplifier optimized for low-noise (7.9nV/√Hz at 30kHz), ultra-low distortion (0.0012% THD+N at 1kHz), and low quiescent current (400µA per amplifier) operation from 2.4V to 5.5V. It features 22MHz gain-bandwidth product, stability at gains ≥10V/V, and operates across –40°C to +85°C - ideal for precision ADC buffering in portable instrumentation.
For engineers reviewing the MAX4257ESA+T datasheet, MAX4257ESA+T pinout, MAX4257ESA+T application, or MAX4257ESA+T equivalent, key selection criteria include its decompensated architecture requiring minimum gain of 10V/V, shutdown capability (0.5µA), 8mV rail-to-rail swing with 10kΩ load, and SO-8 package compatibility with space-constrained analog front-ends.
Technical Context
The MAX4257ESA+T is a dual-channel, internally compensated op amp designed for high closed-loop gain applications (AV ≥ 10V/V). Its 22MHz GBW and 2.1V/µs slew rate support fast settling (1.6µs to 0.01%) while maintaining low distortion under heavy capacitive loading (up to 400pF).
It employs a push-pull output stage enabling true rail-to-rail swing and ground-sensing input (VCM includes VSS), with guaranteed no phase reversal during overdrive. Input bias current is 1pA (typ), offset voltage is ±0.07mV (typ), and PSRR exceeds 75dB - making it suitable for high-impedance sensor interfaces and precision signal conditioning.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 22MHz - enables stable operation at AV ≥ 10V/V with sufficient loop gain for precision closed-loop designs |
| THD+N (1kHz) | 0.0012% - ensures minimal harmonic corruption in audio and measurement signal chains |
| Input Voltage-Noise Density | 7.9nV/√Hz at 30kHz - preserves SNR in wideband sensor amplification and ADC driver stages |
| Rail-to-Rail Output Swing | Within 8mV of rails (10kΩ load) - maximizes dynamic range in low-voltage (2.4V–5.5V) systems |
| Quiescent Current | 400µA per amplifier - supports battery-powered operation without compromising AC performance |
| Input Common-Mode Range | Includes ground (VSS) - allows direct interfacing with single-ended, ground-referenced sensors |
| Capacitive Load Drive | Stable up to 400pF - eliminates need for isolation resistors in typical PCB trace and filter capacitor scenarios |
Pinout & Package
MAX4257ESA+T is housed in an 8-pin SO (Small Outline) package with exposed pad (SOIC-8), footprint compatible with industry-standard 150mil-wide SOIC layouts.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUTA | Output of amplifier A - rail-to-rail capable, high-impedance in shutdown mode when SHDNA asserted |
| 2 | IN–A | Inverting input of amplifier A - 11pF input capacitance requires feed-forward compensation for optimal stability at high gains |
| 3 | IN+A | Noninverting input of amplifier A - supports common-mode voltages down to VSS (ground) |
| 4 | VSS | Negative supply - connect directly to ground in single-supply configurations |
| 5 | VDD | Positive supply - bypass with 0.1µF ceramic capacitor near pin for noise immunity |
| 6 | IN+B | Noninverting input of amplifier B - independent channel with identical DC/AC specs as Channel A |
| 7 | IN–B | Inverting input of amplifier B - matched input characteristics enable dual-channel differential or parallel configurations |
| 8 | OUTB | Output of amplifier B - fully independent output with same rail-to-rail swing and load drive capability as OUTA |
Key Features
| Feature | Design Value |
|---|---|
| Decompensated architecture | Stable only at gains ≥10V/V - delivers 22MHz GBW and 2.1V/µs slew rate for high-speed precision gain stages |
| Ultra-low input current noise | 0.5fA/√Hz - critical for preserving signal integrity in high-impedance piezoelectric or photodiode sensor interfaces |
| Ground-sensing input | VCM extends to VSS - enables direct connection to unipolar transducer outputs without level-shifting circuitry |
| Low-power shutdown | Reduces IQ to 0.5µA and places outputs in high-Z state - essential for power-gating in multi-stage analog signal paths |
| 400pF capacitive-load stability | No external isolation resistor required for typical PCB traces and RC filters - simplifies layout and reduces component count |
Applications
| ADC Buffering | Portable Medical Instrumentation |
|---|---|
Use Scenario: Driving the input of a 16-bit SAR ADC (e.g., MAX195) in a handheld ECG monitor. IC Role / Device Role / Timing Role: Precision voltage follower/buffer isolating high-impedance electrode signals from ADC sampling kickback. Use Value: 7.9nV/√Hz input noise and 0.0012% THD+N preserve ENOB; rail-to-rail swing maximizes utilization of 5V ADC reference. | Use Scenario: Signal conditioning for piezoresistive pressure sensors in battery-powered spirometers. IC Role / Device Role / Timing Role: Low-noise, low-drift gain stage amplifying µV-level bridge outputs before digitization. Use Value: 1pA input bias current prevents loading of high-Z sensor bridges; 400µA IQ extends battery life in Class II medical devices. |
| Digital Scale Strain Gauge Interface | Wireless Communication PA Control |
Use Scenario: Amplifying mV-level Wheatstone bridge outputs in industrial digital scales. IC Role / Device Role / Timing Role: Instrumentation-grade differential-to-single-ended converter with gain ≥10V/V. Use Value: ±0.07mV offset and 0.3µV/°C drift ensure <0.01% linearity over temperature; SO-8 package supports automated assembly. | Use Scenario: Closed-loop RF power amplifier (PA) output monitoring in LTE/Wi-Fi modules. IC Role / Device Role / Timing Role: High-speed, low-distortion comparator input buffer for directional coupler feedback paths. Use Value: 22MHz GBW and 2.1V/µs slew rate support accurate envelope tracking at >10MHz modulation bandwidths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel, high-gain op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2350UA | Unity-gain stable (3.8MHz GBW), lower noise (7nV/√Hz), no shutdown | Suitable for AV = 1–5V/V; lacks shutdown and higher GBW for gain ≥10V/V | Select when unity-gain stability or lower noise at sub-1MHz bandwidth is prioritized over gain-headroom and power gating |
| AD8629ARZ | Zero-drift architecture (0.1µV/°C drift), lower offset (1µV), 2.5MHz GBW, no shutdown | Better DC accuracy for precision DC-coupled sensors; insufficient GBW for >100kHz closed-loop gain ≥10V/V | Select when ultra-low drift and offset dominate over AC performance and power management features |
Compared with OPA2350UA and AD8629ARZ, MAX4257ESA+T uniquely combines decompensated 22MHz GBW, shutdown capability, and rail-to-rail output in an SO-8 package - making it the only option among the three qualified for high-gain, low-power, battery-operated signal chains requiring both speed and efficiency.
Availability
MAX4257ESA+T is available at Aetrix Electronics and suitable for portable medical instrumentation, precision ADC buffering, digital scale strain gauge interfaces, and wireless communication PA control requiring stable component supply across industrial and commercial temperature ranges.
Supply support for MAX4257ESA+T 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
Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, and communications markets.
The MAX4249–MAX4257 family was engineered specifically for low-noise, low-distortion, rail-to-rail signal conditioning in battery-powered and space-constrained analog front-ends - emphasizing power efficiency without sacrificing AC performance.
FAQ
What is the minimum stable gain for MAX4257ESA+T?
The MAX4257ESA+T is internally compensated for minimum closed-loop gain of 10V/V. Operating at lower gains (e.g., unity or AV = 2V/V) risks instability and peaking due to insufficient phase margin. For unity-gain applications, consider the MAX4250 series instead.
Does MAX4257ESA+T include a shutdown feature?
No, MAX4257ESA+T does not include a shutdown input. Shutdown functionality is present only on MAX4249, MAX4251, MAX4253, and MAX4256 variants. The MAX4257ESA+T provides dual-channel amplification without power-gating capability.
What is the maximum capacitive load MAX4257ESA+T can drive without external compensation?
MAX4257ESA+T remains stable driving capacitive loads up to 400pF with no external components. Beyond this value, an isolation resistor (e.g., 150Ω for 1000pF) must be placed in series with the output to maintain phase margin and prevent oscillation.
Is MAX4257ESA+T pin-compatible with other devices in the MAX4249–MAX4257 family?
Yes, MAX4257ESA+T shares the same 8-pin SO pinout with MAX4252, MAX4256, and MAX4257EUA+, but differs from MAX4249 (14-pin SO/10-pin µMAX) and MAX4251 (8-pin SO with SHDN). Always verify pin function mapping - especially absence of SHDN on MAX4257ESA+T - before board reuse.
What is the input common-mode voltage range for MAX4257ESA+T?
The input common-mode voltage range for MAX4257ESA+T extends from VSS (ground) to VDD – 1.1V. This ground-sensing capability allows direct interface with single-ended, ground-referenced sources such as resistive sensors and transducer bridges without level-shifting circuitry.
MAX4257ESA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 2
- Output Type:
- Push-Pull, Rail-to-Rail
- Slew Rate:
- 2.1V/µs
- Gain Bandwidth Product:
- 22 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 0.1 pA
- Voltage - Input Offset:
- 70 µV
- Current - Supply:
- 420µA (x2 Channels)
- Current - Output / Channel:
- 68 mA
- Voltage - Supply Span (Min):
- 2.4 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX4257ESA+T FAQ
1.How can I place an order for MAX4257ESA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4257ESA+T 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 MAX4257ESA+T reliable?
The price and inventory of MAX4257ESA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4257ESA+T is usually 5 days.
3.What payment methods are accepted for MAX4257ESA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4257ESA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4257ESA+T?
MAX4257ESA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4257ESA+T 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 MAX4257ESA+T?
For technical support, including MAX4257ESA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4257ESA+T requirements.
6.How does Aetrix verify that MAX4257ESA+T is sourced from the original manufacturer or authorized distributors?
All MAX4257ESA+T 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 MAX4257ESA+T meets industry standards.
7.What is the process for return or replacement of MAX4257ESA+T?
All MAX4257ESA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4257ESA+T, 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 MAX4257ESA+T part is unused and in its original packaging.
Return procedure for MAX4257ESA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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