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Analog Devices Inc./Maxim Integrated MAX4125ESA
- Part No.:
- MAX4125ESA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX4125ESA.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,833
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Product details
Overview
MAX4125ESA from Maxim Integrated is a single-channel, decompensated rail-to-rail input/output operational amplifier optimized for high-speed, low-power signal conditioning in precision data-acquisition systems. It delivers 25MHz gain-bandwidth product, 10V/µs slew rate, and 200µV max input offset voltage while consuming only 650µA quiescent current per amplifier. Its shutdown mode reduces supply current to 25µA and places the output in high-impedance state - ideal for battery-powered portable instrumentation.
For engineers reviewing the MAX4125ESA datasheet, MAX4125ESA pinout, MAX4125ESA application, or MAX4125ESA equivalent, key selection criteria include its stable operation at closed-loop gains ≥10V/V, rail-to-rail swing into 250Ω loads, −40°C to +85°C temperature range, and compatibility with single supplies from +2.7V to +6.5V or dual ±1.35V to ±3.25V.
Technical Context
The MAX4125ESA uses a decompensated architecture requiring minimum closed-loop gain of 10V/V for stability, distinguishing it from unity-gain-stable variants like MAX4123. Its input stage combines NPN and PNP differential pairs to achieve rail-to-rail common-mode range extending 250mV beyond VEE and VCC, enabling operation down to 1.8V despite 2.7V minimum spec.
It features an integrated shutdown control (SHDN) that disables the amplifier and forces output into high-impedance state while reducing quiescent current to ≤25µA. The output stage drives 250Ω loads with <150mV headroom to rails and remains stable with up to 500pF capacitive loads without external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 25MHz - enables stable amplification of signals up to ~2.5MHz at G = 10V/V |
| Slew Rate | 10V/µs - supports clean 1MHz full-scale step response with ≤0.1% distortion |
| Input Offset Voltage | ±200µV max - ensures ≤0.004% error in 5V-span 12-bit systems |
| Quiescent Current | 650µA per amplifier - allows >1000 hours runtime on a 650mAh coin cell |
| Shutdown Current | 25µA per amplifier - reduces system standby power by 26× vs active mode |
| Supply Range | +2.7V to +6.5V single or ±1.35V to ±3.25V dual - supports Li-ion, 3.3V, and 5V rails |
| Output Drive | 250Ω load - interfaces directly with ADC drivers, analog switches, and DAC buffers |
Pinout & Package
MAX4125ESA is housed in an 8-pin SO (Small Outline) package with standard 1.27mm pitch, JEDEC MS-012AC compliant, measuring 4.9mm × 3.9mm × 1.75mm. Thermal resistance θJA is 150°C/W.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT | Amplifier output - rail-to-rail swing, high-impedance during shutdown |
| 2 | IN− | Inverting input - part of complementary NPN/PNP input stage |
| 3 | IN+ | Noninverting input - accepts common-mode voltages from VEE − 0.25V to VCC + 0.25V |
| 4 | VEE | Negative supply / ground - reference for single-supply operation |
| 5 | VCC | Positive supply - powers internal bias networks and output stage |
| 6 | SHDN | Shutdown control - logic-low (<0.8V) disables amplifier; floating/high enables |
| 7 | N.C. | No connect - internally unused; must remain unconnected |
| 8 | N.C. | No connect - internally unused; must remain unconnected |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail I/O | Enables full dynamic range utilization in low-voltage (≥2.7V) single-supply systems |
| 25MHz GBW at G ≥10 | Supports high-fidelity amplification of sensor signals in portable medical and test equipment |
| 25µA shutdown current | Permits microcontroller-controlled power gating in multi-stage analog front-ends |
| Stable with 500pF load | Eliminates need for isolation resistors when driving ADC input capacitance or long traces |
| No phase reversal | Prevents latch-up or erroneous output behavior during input overdrive events |
Applications
| Battery-Powered Instruments | Portable Data Loggers |
|---|---|
Use Scenario: Handheld multimeter front-end amplifying mV-level thermocouple or shunt voltage signals. IC Role / Device Role / Timing Role: Precision DC-coupled gain stage with rail-to-rail input enabling full-scale measurement from near-ground to supply rail. Use Value: 200µV offset and 25MHz bandwidth ensure sub-0.01% gain error and fast settling for auto-ranging functions. | Use Scenario: Low-power sensor node conditioning analog outputs from accelerometers, pressure sensors, and gas detectors. IC Role / Device Role / Timing Role: Signal conditioner preceding SAR ADC - provides gain, filtering, and drive capability with minimal quiescent power. Use Value: 650µA operating current and 25µA shutdown mode extend battery life while maintaining measurement fidelity. |
| Low-Voltage Data Acquisition | Medical Sensor Interfaces |
Use Scenario: 3.3V-powered industrial DAQ module acquiring 0–5V sensor outputs with 12-bit+ resolution. IC Role / Device Role / Timing Role: Input buffer and level-shifter ensuring rail-to-rail signal integrity across varying sensor output ranges. Use Value: Common-mode range extending 250mV beyond rails eliminates need for external level-shifting circuitry. | Use Scenario: ECG/EEG front-end amplifying µV-level biopotentials with high CMRR and low noise. IC Role / Device Role / Timing Role: First-stage instrumentation amplifier driver - provides gain, low-noise buffering, and output drive into anti-aliasing filter. Use Value: 22nV/√Hz input noise density and 78dB min CMRR support diagnostic-grade signal fidelity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar rail-to-rail op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4123ESA | Unity-gain stable, 5MHz GBW, same 8-SO package and shutdown function | Better suited for G = 1–5 applications (e.g., voltage followers, active filters) | Select MAX4123ESA when closed-loop gain <10V/V is required; MAX4125ESA is mandatory for ≥10V/V high-speed gain stages |
| OPA350UA | Unity-gain stable, 38MHz GBW, 5.5V max supply, no shutdown pin | Lacks integrated shutdown; requires external enable logic for power gating | Choose OPA350UA only if higher bandwidth at G = 1 is critical and shutdown functionality is implemented externally |
Compared with MAX4123ESA and OPA350UA, the MAX4125ESA uniquely balances high-speed decompensated performance (25MHz), integrated shutdown, and rail-to-rail operation in a single 8-pin SO package - making it optimal for space-constrained, battery-sensitive designs requiring gain ≥10V/V.
Availability
MAX4125ESA is available at Aetrix Electronics and suitable for battery-powered instruments, portable data loggers, and low-voltage data-acquisition systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX4125ESA 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 industrial, medical, and communications applications.
The MAX4122–MAX4129 family was engineered specifically for low-power, rail-to-rail signal conditioning in portable and battery-operated precision data-acquisition systems.
FAQ
What is the minimum closed-loop gain required for stable operation of the MAX4125ESA?
The MAX4125ESA is decompensated and requires a minimum closed-loop gain of 10V/V for stability. Attempting unity-gain or G = 2 configurations will cause oscillation. For lower-gain applications, use the unity-gain-stable MAX4123ESA instead. This design choice enables the MAX4125ESA's 25MHz bandwidth while maintaining phase margin above 60° at G ≥10.
Does the MAX4125ESA support true rail-to-rail input common-mode voltage range?
Yes - the MAX4125ESA accepts input voltages from (VEE − 0.25V) to (VCC + 0.25V), exceeding both supply rails by 250mV. This is achieved via complementary NPN/PNP input pairs, allowing accurate amplification of signals near ground or near VCC in single-supply systems. The transition region near VCC/2 is widened to minimize CMRR degradation.
How does the shutdown function affect the output state of the MAX4125ESA?
When SHDN is pulled low (<0.8V), the MAX4125ESA disables its internal circuitry and places the OUT pin in a high-impedance (Hi-Z) state - not tri-state in the digital sense, but electrically disconnected from both rails. This prevents loading of downstream circuitry. Supply current drops to ≤25µA per amplifier, and turn-on time after SHDN release is typically 1µs.
Can the MAX4125ESA drive a 500pF capacitive load without external compensation?
Yes - the MAX4125ESA is explicitly characterized and guaranteed stable with up to 500pF capacitive loads at G ≥10V/V, per datasheet Figure 4 and AC Electrical Characteristics table. This eliminates the need for series isolation resistors in typical ADC driver or filter interface applications, simplifying layout and preserving signal integrity.
What is the maximum output voltage swing of the MAX4125ESA into a 250Ω load?
Into a 250Ω load referenced to VEE (ground), the MAX4125ESA delivers a minimum output swing of VEE + 12mV to VCC − 15mV at VCC = 5V (DC Electrical Characteristics, TA = +25°C). At VCC = 2.7V, swing is VEE + 25mV to VCC − 35mV. These values confirm true rail-to-rail capability under moderate load conditions.
MAX4125ESA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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 FAQ
1.How can I place an order for MAX4125ESA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4125ESA 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 reliable?
The price and inventory of MAX4125ESA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4125ESA is usually 5 days.
3.What payment methods are accepted for MAX4125ESA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4125ESA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4125ESA?
MAX4125ESA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4125ESA 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?
For technical support, including MAX4125ESA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4125ESA requirements.
6.How does Aetrix verify that MAX4125ESA is sourced from the original manufacturer or authorized distributors?
All MAX4125ESA 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 meets industry standards.
7.What is the process for return or replacement of MAX4125ESA?
All MAX4125ESA units undergo pre-shipment inspection (PSI). If there is an issue with MAX4125ESA, 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 part is unused and in its original packaging.
Return procedure for MAX4125ESA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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