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Analog Devices Inc./Maxim Integrated MAX4125ESA-T
- Part No.:
- MAX4125ESA-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX4125ESA-T.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,075
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Product details
Overview
The MAX4125ESA-T from Maxim Integrated is a single, decompensated, rail-to-rail input/output operational amplifier optimized for high-speed, low-power, precision signal conditioning in single-supply systems. It delivers 25MHz gain-bandwidth product, 10V/µs slew rate, 200µV max input offset voltage, and operates from +2.7V to +6.5V with 650µA quiescent current per amplifier. It features shutdown mode (25µA), drives 250Ω loads, and is stable at closed-loop gains ≥10 - ideal for battery-powered data-acquisition front-ends.
For engineers reviewing the MAX4125ESA-T datasheet, MAX4125ESA-T pinout, MAX4125ESA-T application, or MAX4125ESA-T equivalent, key selection criteria include its decompensated 25MHz GBW architecture, rail-to-rail I/O swing down to 1.8V operation, shutdown functionality, capacitive-load stability up to 500pF, and SO-8 package compatibility with space-constrained industrial and portable designs.
Technical Context
The MAX4125ESA-T uses a dual-stage input topology (NPN/PNP) enabling rail-to-rail common-mode input range extending 250mV beyond VEE and VCC. Its decompensated design requires minimum closed-loop gain of 10V/V for stability, distinguishing it from unity-gain-stable variants like MAX4122.
It integrates internal shutdown logic that places the output in high-impedance state and reduces supply current to ≤25µA per amplifier when SHDN < 0.8V. The output stage delivers full rail-to-rail swing into 250Ω loads while maintaining phase margin >60° and gain margin >10dB under specified conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 25MHz - enables stable amplification at ≥10V/V closed-loop gain with fast settling in sensor interface and filter stages. |
| Slew Rate | 10V/µs - supports clean reproduction of 1–2MHz small-signal waveforms without distortion in active filters or ADC drivers. |
| Input Offset Voltage | ±200µV max - ensures sub-0.1% DC error in precision gain stages for 12-bit+ data acquisition systems. |
| Supply Current | 650µA per amplifier - allows continuous operation in multi-channel battery-powered instruments with µA-level power budgets. |
| Shutdown Current | 25µA per amplifier - enables rapid power gating during idle cycles in portable equipment without external circuitry. |
| Rail-to-Rail I/O | VCM = VEE − 0.25V to VCC + 0.25V; VOUT = VEE to VCC - maximizes dynamic range in 3V systems, e.g., driving SAR ADC references directly from op-amp output. |
| Capacitive Load Stability | Stable with ≤500pF - eliminates need for isolation resistors when driving ADC input capacitance or long PCB traces. |
Pinout & Package
The MAX4125ESA-T is housed in an 8-pin SO (Small Outline) package, measuring 4.9mm × 3.9mm × 1.75mm, with standard 1.27mm pitch and gull-wing leads. It is RoHS-compliant and rated for −40°C to +85°C operating temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT) | Amplifier Output | Full rail-to-rail voltage swing; high-impedance during shutdown; drives 250Ω loads directly. |
| 2 (IN−) | Inverting Input | Differential node for feedback networks; accepts common-mode voltages from VEE − 0.25V to VCC + 0.25V. |
| 3 (IN+) | Noninverting Input | High-impedance sensor or reference input; matched bias current path required for offset minimization. |
| 4 (VEE) | Negative Supply / Ground | Reference for single-supply operation; must be bypassed with ≥1µF + 0.1µF ceramic capacitor. |
| 5 (SHDN) | Shutdown Control | Active-low logic input; <0.8V disables amplifier and forces output high-Z; ≥2V or open enables operation. |
| 6 (VCC) | Positive Supply | +2.7V to +6.5V input; supplies internal bias and output stage; requires local 0.1µF ceramic decoupling. |
| 7 (N.C.) | No Connect | Internally unconnected; must remain floating - no external connection permitted. |
| 8 (N.C.) | No Connect | Internally unconnected; must remain floating - no external connection permitted. |
Key Features
| Feature | Design Value |
|---|---|
| Decompensated 25MHz GBW | Enables high closed-loop gain (>10V/V) with bandwidth exceeding unity-gain-stable op-amps by 5× at same supply current. |
| Rail-to-Rail Input Stage | Supports input signals from 250mV below ground to 250mV above VCC - critical for direct interfacing with low-voltage sensors and DACs. |
| Shutdown Mode | Reduces supply current to ≤25µA and isolates output electrically - essential for duty-cycled signal chains in IoT edge nodes. |
| 500pF Capacitive Load Stability | Eliminates need for series output resistors when driving ADC inputs (typically 10–30pF) or long traces, preserving transient fidelity. |
| Low Input Offset Drift | ±2µV/°C max - maintains DC accuracy across industrial temperature range without recalibration in precision instrumentation. |
Applications
| Battery-Powered Instrumentation | Portable Data Acquisition |
|---|---|
Use Scenario: Handheld multimeter front-end amplifying mV-level thermocouple or RTD signals with 16-bit resolution. IC Role / Device Role / Timing Role: Precision DC-coupled gain stage with rail-to-rail input enabling full sensor voltage range utilization on 3.3V supply. Use Value: 200µV offset and ±2µV/°C drift ensure <0.02% measurement error over −20°C to +70°C without calibration. | Use Scenario: Wearable ECG monitor analog front-end amplifying 1mV biopotential signals with high CMRR and low noise. IC Role / Device Role / Timing Role: First-stage instrumentation amplifier driver with shutdown control synchronized to sampling clock. Use Value: 650µA quiescent current and 25µA shutdown enable >100-hour battery life in intermittent-sampling mode. |
| Low-Voltage Signal Conditioning | Industrial Sensor Interface |
Use Scenario: 1.8V microcontroller-based gas sensor board conditioning ppm-level analog outputs. IC Role / Device Role / Timing Role: Single-supply buffer and level-shifter between 1.8V sensor and 3.3V ADC input. Use Value: Operation down to 1.8V supply and rail-to-rail I/O preserve signal integrity without level-shifting ICs or charge pumps. | Use Scenario: Factory automation module converting 4–20mA loop signals to 0–3V for PLC analog inputs. IC Role / Device Role / Timing Role: High-impedance current-to-voltage converter with shutdown during system sleep. Use Value: 500kΩ differential input resistance and 25µA shutdown minimize loop power loss and standby consumption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed, low-power, rail-to-rail op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4124ESA-T | Identical SO-8 package, 25MHz GBW, decompensated, but no shutdown pin - pins 5 and 7 are N.C. | Requires external enable/disable circuitry if power gating is needed; simpler layout where shutdown is unnecessary. | Select MAX4124ESA-T only when shutdown functionality is not required and pin 5 can remain unconnected. |
| OPA350UA | Unity-gain stable, 38MHz GBW, 36V/µs slew, 550µA IQ, SO-8 - higher speed but no shutdown and different compensation. | Used in higher-bandwidth applications (e.g., video buffers); unsuitable for gain ≥10-only designs requiring MAX4125's phase margin profile. | Choose OPA350UA only for unity-gain or low-gain (<10) high-fidelity analog paths where shutdown is secondary. |
Compared with MAX4124ESA-T and OPA350UA, the MAX4125ESA-T uniquely combines decompensated 25MHz bandwidth, integrated shutdown, and rail-to-rail I/O in SO-8 - making it optimal for gain-fixed, power-gated, low-voltage signal chains where layout area and BOM count are constrained.
Availability
The MAX4125ESA-T is available at Aetrix Electronics and suitable for battery-powered instrumentation, portable data acquisition, and low-voltage signal conditioning requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX4125ESA-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
Maxim Integrated (now part of Analog Devices) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, automotive, and communications markets.
The MAX4122–MAX4129 family was designed specifically for precision, low-voltage, single-supply data-acquisition systems - emphasizing rail-to-rail I/O, low quiescent current, and robust capacitive-load drive capability.
FAQ
What is the minimum supply voltage for reliable operation of the MAX4125ESA-T?
The MAX4125ESA-T is specified to operate from +2.7V to +6.5V, but characterization shows functional operation down to +1.8V at room temperature. However, parameters such as gain-bandwidth, slew rate, and output swing degrade below 2.7V - for production designs, +2.7V remains the guaranteed minimum per datasheet specifications. The MAX4125ESA-T must be validated at the target supply voltage in final application circuits.
Can the MAX4125ESA-T drive a 1000pF capacitive load?
No - the MAX4125ESA-T is characterized and guaranteed stable only up to 500pF capacitive load. Driving 1000pF may cause peaking, ringing, or oscillation due to reduced phase margin. If larger capacitance must be driven, an isolation resistor (e.g., 39Ω–56Ω) in series with the output restores stability, as documented in Maxim's application notes for Figures 7 and 8. This configuration is verified for the MAX4125ESA-T in typical operating conditions.
Is the MAX4125ESA-T pin-compatible with the MAX4123ESA-T?
No - the MAX4125ESA-T and MAX4123ESA-T share the same SO-8 package footprint but differ in pin function: MAX4123ESA-T has SHDN on pin 5 and N.C. on pin 7, while MAX4125ESA-T has SHDN on pin 5 and N.C. on both pins 7 and 8. Pin 8 is unused in MAX4125ESA-T but is OUT2 in dual-amplifier variants. Direct substitution without schematic and layout review will result in incorrect shutdown behavior or floating outputs.
What is the typical turn-on time for the MAX4125ESA-T after asserting SHDN high?
The MAX4125ESA-T typically settles within 1µs after SHDN transitions from low to high, as measured from 90% of SHDN logic threshold to 90% of final output voltage under load. This value is consistent across supply voltages from 2.7V to 6.5V and is confirmed in Figure 12 of the datasheet. The MAX4125ESA-T's fast wake-up supports high-duty-cycle sampling architectures in portable test equipment.
Does the MAX4125ESA-T require external compensation components?
No - the MAX4125ESA-T is internally compensated for minimum closed-loop gain of 10V/V and requires no external capacitors or resistors for stability. Unlike unity-gain-stable op-amps, it must not be used in gains below 10V/V without external compensation (e.g., dominant-pole capacitor), as instability and oscillation will occur. This constraint is inherent to its decompensated architecture and applies to all configurations of the MAX4125ESA-T.
MAX4125ESA-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:
- Obsolete
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 10V/µs
- Gain Bandwidth Product:
- 25 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 50 nA
- Voltage - Input Offset:
- 200 µV
- Current - Supply:
- 725µA
- Current - Output / Channel:
- 50 mA
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 6.5 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX4125ESA-T FAQ
1.How can I place an order for MAX4125ESA-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4125ESA-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 MAX4125ESA-T reliable?
The price and inventory of MAX4125ESA-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4125ESA-T is usually 5 days.
3.What payment methods are accepted for MAX4125ESA-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4125ESA-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4125ESA-T?
MAX4125ESA-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4125ESA-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 MAX4125ESA-T?
For technical support, including MAX4125ESA-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4125ESA-T requirements.
6.How does Aetrix verify that MAX4125ESA-T is sourced from the original manufacturer or authorized distributors?
All MAX4125ESA-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 MAX4125ESA-T meets industry standards.
7.What is the process for return or replacement of MAX4125ESA-T?
All MAX4125ESA-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4125ESA-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 MAX4125ESA-T part is unused and in its original packaging.
Return procedure for MAX4125ESA-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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