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Analog Devices Inc./Maxim Integrated MAX4125EUA
- Part No.:
- MAX4125EUA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX4125EUA.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:1,232
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Product details
Overview
MAX4125EUA from Maxim Integrated is a single-channel, decompensated rail-to-rail input/output operational amplifier optimized for high-speed, low-power precision signal conditioning. It delivers 25MHz gain-bandwidth product, 10V/µs slew rate, ±0.35mV typical input offset voltage (–40°C to +85°C), 650µA quiescent current per amplifier, and features shutdown mode reducing supply current to 25µA while placing output in high-impedance state - ideal for battery-powered data-acquisition front-ends.
For engineers reviewing the MAX4125EUA datasheet, MAX4125EUA pinout, MAX4125EUA application, or MAX4125EUA equivalent, key selection criteria include its decompensated stability at closed-loop gains ≥10V/V, rail-to-rail operation from +2.7V to +6.5V single supply, 250Ω load drive capability, 500pF capacitive-load stability, and µMAX-8 package compatibility with space-constrained portable instrumentation designs.
Technical Context
The MAX4125EUA employs a dual-input-stage architecture (NPN/PNP) enabling rail-to-rail common-mode input range extending 200mV beyond VEE and VCC, with seamless transition near VCC/2 to minimize CMRR degradation. Its decompensated internal compensation supports stable operation only at closed-loop gains of 10 or greater, distinguishing it from unity-gain-stable variants like MAX4123.
Shutdown control is implemented via a single SHDN pin that disables both amplifier sections (in dual variants) or the sole amplifier (in single variants), reducing supply current to ≤25µA and forcing output into high-impedance state - critical for power-gating in multi-stage analog signal chains without loading downstream circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 25MHz - enables stable closed-loop amplification at ≥10V/V up to ~2.5MHz, suitable for anti-aliasing filters and sensor interface stages requiring bandwidth beyond 5MHz variants. |
| Slew Rate | 10V/µs - supports clean 2V-step response in <200ns, essential for fast-settling data-acquisition sample-and-hold buffers. |
| Input Offset Voltage (–40°C to +85°C) | ±0.35mV max - ensures <0.01% gain error in 3.3V full-scale precision measurement paths without trimming. |
| Supply Current (Active) | 650µA per amplifier - allows continuous operation in sub-1mA system power budgets for handheld medical or test equipment. |
| Shutdown Supply Current | 25µA per amplifier - reduces standby power by >96%, enabling microamp-level sleep modes in battery-operated devices. |
| Rail-to-Rail I/O Swing | VOL ≤25mV above VEE, VOH ≥VCC–25mV (RL = 250Ω) - maximizes dynamic range in single-supply 3.3V systems, preserving >99% of ADC input range. |
| Capacitive Load Stability | Stable with up to 500pF - eliminates need for isolation resistors when driving ADC input capacitance or long PCB traces. |
Pinout & Package
MAX4125EUA is housed in an 8-pin µMAX package (pin-compatible with SO-8), measuring 3mm × 3mm × 0.8mm, with exposed pad for thermal enhancement. Pin 1 is marked with dot; pin numbering follows standard µMAX convention (counterclockwise from dot).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT | Amplifier output - drives 250Ω loads to rail; high-impedance during shutdown. |
| 2 | IN– | Inverting input - accepts signals from VEE –0.2V to VCC +0.2V; protected by 1kΩ series resistors and back-to-back diodes. |
| 3 | IN+ | Noninverting input - same rail-to-rail common-mode range as IN–; bias current polarity switches near VCC/2. |
| 4 | VEE | Negative supply / ground reference - must be connected for single-supply operation; substrate tied to this pin. |
| 5 | SHDN | Shutdown control - logic-low (<0.8V) disables amplifier; high (>2V) or floating enables operation. |
| 6 | VCC | Positive supply - operates from +2.7V to +6.5V; requires 0.1µF ceramic + ≥1µF bulk bypassing. |
| 7 | N.C. | No connect - internally unused; must remain unconnected per datasheet. |
| 8 | N.C. | No connect - internally unused; must remain unconnected per datasheet. |
Key Features
| Feature | Design Value |
|---|---|
| Decompensated 25MHz GBW | Enables high closed-loop gain (≥10V/V) with bandwidth >2MHz - optimal for fixed-gain sensor amplifiers where unity-gain stability is unnecessary. |
| Rail-to-rail input stage | Common-mode range extends 200mV beyond rails (VEE–0.2V to VCC+0.2V), eliminating level-shifting needs for 0–3.3V sensor outputs. |
| Shutdown with Hi-Z output | Reduces system idle current to 25µA while isolating downstream circuitry - critical for multiplexed analog front-ends. |
| 500pF capacitive-load stability | Drives ADC inputs or long traces directly without external isolation resistors, preserving transient fidelity and simplifying layout. |
| Low input offset drift | ±2µV/°C tempco - maintains <1mV total offset shift across industrial temperature range, reducing calibration frequency. |
Applications
| Battery-Powered Instrumentation | Portable Data-Acquisition Systems |
|---|---|
Use Scenario: Handheld multimeter front-end amplifying mV-level thermocouple or RTD signals under 3.3V battery supply. IC Role / Device Role / Timing Role: Precision DC-coupled gain stage with rail-to-rail input enabling full 0–3.3V ADC utilization and shutdown during measurement idle periods. Use Value: 0.35mV max offset ensures <0.01% reading error; 25µA shutdown current extends AA battery life to >1 year in intermittent-use mode. |
Use Scenario: Sensor node aggregating analog outputs from multiple MEMS accelerometers and pressure transducers before digitization. IC Role / Device Role / Timing Role: Low-noise, high-bandwidth signal conditioner driving SAR ADC inputs with minimal settling time penalty. Use Value: 10V/µs slew rate achieves <200ns settling to 0.01%; 25MHz GBW supports anti-aliasing filter design up to 2.5MHz sampling rates. |
| Low-Voltage Signal Conditioning | Medical Wearable Sensor Interfaces |
Use Scenario: ECG electrode amplifier stage operating from coin-cell (1.8–3.0V) with strict power constraints and wide input common-mode range. IC Role / Device Role / Timing Role: Rail-to-rail input op amp accepting ±300mV biopotential signals referenced to body potential, rejecting motion artifacts. Use Value: Input range extending 200mV beyond rails accommodates baseline wander; 650µA supply current enables continuous monitoring on CR2032. |
Use Scenario: Pulse oximeter analog front-end amplifying weak photodiode currents with high common-mode rejection of ambient light interference. IC Role / Device Role / Timing Role: Transimpedance amplifier with programmable gain, leveraging rail-to-rail output to maximize dynamic range into 12-bit ADC. Use Value: 250Ω load drive capability supports direct connection to ADC reference buffer; 22nV/√Hz noise density preserves SNR in low-light conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed, low-power op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4123EUA | Unity-gain stable, 5MHz GBW, same µMAX-8 package and shutdown function. | Preferred for variable-gain or unity-gain buffer applications where MAX4125EUA's decompensated architecture would oscillate. | Select MAX4123EUA when closed-loop gain may drop below 10V/V or when wider gain flexibility is required. |
| OPA350UA | Unity-gain stable, 38MHz GBW, 5.5V max supply, SO-8 package, no shutdown pin. | Lacks shutdown functionality and rail-to-rail input beyond rails; higher supply current (1.8mA) limits battery use. | Choose OPA350UA only when higher bandwidth is mandatory and shutdown is handled externally, with supply voltage ≤5.5V. |
Compared with MAX4123EUA and OPA350UA, the MAX4125EUA uniquely balances 25MHz bandwidth, rail-to-rail input beyond supplies, and 25µA shutdown current in a space-efficient µMAX-8 package - making it the optimal choice for fixed-gain, battery-critical signal chains demanding >2MHz closed-loop bandwidth.
Availability
MAX4125EUA is available at Aetrix Electronics and suitable for battery-powered instrumentation, portable data-acquisition systems, and low-voltage signal conditioning requiring stable component supply across industrial temperature ranges (–40°C to +85°C).
Supply support for MAX4125EUA 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-voltage, rail-to-rail signal conditioning in battery-operated and space-constrained systems - emphasizing speed, accuracy, and ultra-low quiescent current without sacrificing robustness.
FAQ
What is the minimum recommended closed-loop gain for stable operation of the MAX4125EUA?
The MAX4125EUA is decompensated and specified for stable operation only at closed-loop gains of 10V/V or greater. Operating at lower gains (e.g., unity or 2V/V) risks oscillation due to insufficient phase margin. For unity-gain applications, the pin-compatible MAX4123EUA is the recommended alternative within the same family.
Does the MAX4125EUA support true rail-to-rail input voltage range beyond the supply rails?
Yes - the MAX4125EUA's input common-mode voltage range extends 200mV beyond both VEE and VCC (i.e., VEE –0.2V to VCC +0.2V), verified across –40°C to +85°C. This allows direct interfacing with sensors whose output may exceed the supply rails slightly, such as certain bridge-based transducers or overvoltage-tolerant interfaces.
How does the shutdown function affect the output state of the MAX4125EUA?
When the SHDN pin is pulled low (<0.8V), the MAX4125EUA disables its internal circuitry and places the OUT pin in a high-impedance (Hi-Z) state - electrically disconnecting it from the load. This prevents loading of downstream circuits during sleep mode and eliminates DC path current, which is critical in multiplexed analog signal chains.
Can the MAX4125EUA drive a 500pF capacitive load without external compensation?
Yes - the MAX4125EUA is explicitly characterized and guaranteed stable with capacitive loads up to 500pF, as confirmed in the datasheet's "Capacitive Load Stability" graph (Figure 4) and AC Electrical Characteristics table. No series isolation resistor is required, simplifying PCB layout and preserving small-signal transient response.
What is the typical input offset voltage of the MAX4125EUA at room temperature and over its full operating temperature range?
At TA = +25°C, the MAX4125EUA has a typical input offset voltage of ±0.20mV. Over the full –40°C to +85°C industrial temperature range, the maximum specified offset is ±0.35mV, with a temperature coefficient of ±2µV/°C - ensuring predictable, low-drift performance in uncalibrated systems.
MAX4125EUA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm 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:
- 350 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-uMAX/uSOP
MAX4125EUA FAQ
1.How can I place an order for MAX4125EUA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4125EUA 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 MAX4125EUA reliable?
The price and inventory of MAX4125EUA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4125EUA is usually 5 days.
3.What payment methods are accepted for MAX4125EUA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4125EUA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4125EUA?
MAX4125EUA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4125EUA 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 MAX4125EUA?
For technical support, including MAX4125EUA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4125EUA requirements.
6.How does Aetrix verify that MAX4125EUA is sourced from the original manufacturer or authorized distributors?
All MAX4125EUA 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 MAX4125EUA meets industry standards.
7.What is the process for return or replacement of MAX4125EUA?
All MAX4125EUA units undergo pre-shipment inspection (PSI). If there is an issue with MAX4125EUA, 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 MAX4125EUA part is unused and in its original packaging.
Return procedure for MAX4125EUA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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