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Analog Devices Inc./Maxim Integrated MAX4291EXK-T
- Part No.:
- MAX4291EXK-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
MAX4291EXK-T.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,487
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Product details
Overview
MAX4291EXK-T from Maxim Integrated is a single-channel, micropower, rail-to-rail input/output operational amplifier optimized for ultra-low-voltage battery-powered systems. It operates from 1.8V to 5.5V single supply, draws only 100µA quiescent current per amplifier, delivers 500kHz gain-bandwidth, achieves ±200µV input offset voltage (typ), and swings within 46mV of both rails into 2kΩ - enabling precision signal conditioning in 2-cell alkaline or Li-ion portable instrumentation.
For engineers reviewing the MAX4291EXK-T datasheet, MAX4291EXK-T pinout, MAX4291EXK-T application, or MAX4291EXK-T equivalent, key selection criteria include guaranteed 1.8V operation, rail-to-rail I/O performance at sub-100µA supply current, SC70-5 package footprint constraints, and suitability for low-noise sensor front-ends where THD+N is 0.017% at 1kHz.
Technical Context
The MAX4291EXK-T employs a dual-input-stage architecture combining NPN and PNP differential pairs to achieve true rail-to-rail common-mode input range extending from VEE to VCC. Its output stage uses complementary MOSFETs configured as a current source/sink, delivering rail-to-rail swing with 46mV headroom into 2kΩ while maintaining unity-gain stability up to 100pF capacitive load.
This op amp is explicitly characterized for operation down to 1.5V (typical) despite 1.8V minimum guarantee, supports no phase reversal on overdriven inputs, and exhibits 120dB open-loop voltage gain (RL = 100kΩ) - making it suitable for high-precision, low-power closed-loop configurations such as strain gauge amplifiers and digital scale front-ends.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.8V to 5.5V single supply - enables direct interface with decaying two-cell battery stacks (e.g., 2.4V fresh to 1.8V end-of-life). |
| Quiescent Current | 100µA per amplifier - allows continuous operation in multi-year battery-powered IoT sensors without significant drain. |
| Gain-Bandwidth Product | 500kHz - supports stable DC-coupled amplification of low-frequency biosignals and industrial transducer outputs. |
| Input Offset Voltage | ±200µV (typ) - ensures ≤0.02% error in 1V full-scale 12-bit ADC interfaces without trimming. |
| Output Swing (2kΩ) | Within 46mV of rails - preserves dynamic range in 1.8V systems where headroom is critical for signal fidelity. |
| THD + Noise | 0.017% at 1kHz - meets audio-grade requirements for voice-band sensor preprocessing. |
| CMRR / PSRR | 80dB min (VCC = 1.8V) - rejects battery voltage ripple and PCB ground noise in unregulated supply environments. |
Pinout & Package
The MAX4291EXK-T is housed in a 5-pin SC70 package (2.0mm × 1.25mm × 0.9mm), compatible with standard SOT23 reflow profiles and optimized for space-constrained portable PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN+) | Noninverting Input | Accepts rail-to-rail common-mode signals; matched impedance required to minimize bias-current-induced offset. |
| 2 (IN−) | Inverting Input | Differential input node; protected by 10.6kΩ series resistors and back-to-back diode clamps. |
| 3 (OUT) | Amplifier Output | Drives rail-to-rail into 2kΩ; stable with ≤100pF capacitive loads in unity-gain configuration. |
| 4 (VEE) | Negative Supply | Connected to GND in single-supply mode; defines lower rail for input common-mode and output swing. |
| 5 (VCC) | Positive Supply | Accepts 1.8V–5.5V; bypassed with 100nF capacitor to VEE for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-Rail Input/Output | Enables full utilization of 1.8V supply range - no external level-shifting needed for sensor interfacing. |
| Ultra-Low Quiescent Current | 100µA per amplifier allows >10-year battery life in always-on environmental monitors using CR2032 cells. |
| No Phase Reversal | Prevents latch-up during input overdrive - critical for robust operation in noisy industrial sensor nodes. |
| Unity-Gain Stable | Operates reliably with up to 100pF capacitive load - eliminates need for isolation resistors in most PCB trace scenarios. |
| Low Input Offset Drift | 1.2µV/°C - maintains calibration integrity across −40°C to +85°C industrial temperature range. |
Applications
| Strain Gauge Amplifier | Digital Scale Front-End |
|---|---|
Use Scenario: Amplifying mV-level Wheatstone bridge output from metal foil strain gauges in load cells. IC Role / Device Role / Timing Role: Precision DC-coupled gain stage with rail-to-rail input to capture full bridge swing and rail-to-rail output to maximize ADC input range. Use Value: ±200µV offset and 80dB CMRR ensure <0.1% measurement error at 12-bit resolution without calibration. | Use Scenario: Signal conditioning for microcontroller-based kitchen or medical scales using silicon piezoresistive sensors. IC Role / Device Role / Timing Role: Low-drift, low-noise amplifier driving SAR ADC input with minimal power overhead. Use Value: 0.017% THD+N at 1kHz preserves weight resolution under dynamic loading; 100µA IQ extends AA battery life beyond 2 years. |
| Two-Cell Battery Monitor | Portable Medical Sensor |
Use Scenario: Measuring discharge current in 2-cell Li-ion or NiMH battery packs for handheld test equipment. IC Role / Device Role / Timing Role: High-side current sense amplifier with rail-to-rail output referenced to system ground. Use Value: Operation down to 1.8V ensures accurate monitoring until battery EOL; 46mV output headroom prevents clipping at low VCC. | Use Scenario: Front-end amplification of ECG or pulse oximetry photodiode signals in wearable health monitors. IC Role / Device Role / Timing Role: Low-noise, low-power transimpedance or differential amplifier in analog signal chain prior to ADC. Use Value: 120dB open-loop gain enables precise gain setting with 1% resistors; SC70 package fits within 8mm² wearable PCB area budget. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar micropower rail-to-rail op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV851DBVR | Lower IQ (400nA), narrower GBW (1.7MHz), higher VOS (1.6mV), same SC70-5 package | Better for ultra-long-life coin-cell devices; unsuitable for precision <1mV offset requirements | Select when battery life >5 years is mandatory and offset tolerance >1mV is acceptable |
| OPA316IDBVR | Higher IQ (400µA), wider GBW (10MHz), lower VOS (100µV), same SC70-5 package | Better for higher-speed sensor interfaces; consumes 4× more current than MAX4291EXK-T | Select when bandwidth >1MHz or offset <150µV is required and power budget permits |
Compared with TLV851DBVR and OPA316IDBVR, the MAX4291EXK-T uniquely balances 100µA IQ, 500kHz GBW, and ±200µV VOS in SC70 - making it optimal for mid-precision, multi-year battery-powered instrumentation where power and accuracy must coexist.
Availability
MAX4291EXK-T is available at Aetrix Electronics and suitable for portable medical sensors, two-cell battery instrumentation, and low-power industrial transducer interfaces requiring stable component supply across extended production lifecycles.
Supply support for MAX4291EXK-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) designs precision analog, mixed-signal, and power-management ICs for demanding industrial, automotive, and communications applications.
The MAX4291EXK-T belongs to the MAX4291/MAX4292/MAX4294 family of ultra-small, micropower, rail-to-rail op amps engineered specifically for high-accuracy signal conditioning in space- and energy-constrained portable electronics.
FAQ
What is the minimum operating voltage for the MAX4291EXK-T?
The MAX4291EXK-T is fully specified and guaranteed to operate from 1.8V to 5.5V single supply. Test data shows typical functionality down to 1.5V, but design margins should rely on the 1.8V minimum rating. This makes the MAX4291EXK-T suitable for use with aging two-cell alkaline or NiMH batteries where voltage drops below 1.8V only near end-of-life.
Does the MAX4291EXK-T support rail-to-rail input and output simultaneously?
Yes, the MAX4291EXK-T provides true rail-to-rail input common-mode range (VEE to VCC) and rail-to-rail output swing (within 46mV of both rails into 2kΩ). This simultaneous capability allows full-scale signal handling in 1.8V systems without external level-shifting circuitry - a key advantage for low-voltage sensor front-ends.
Can the MAX4291EXK-T drive capacitive loads without oscillation?
The MAX4291EXK-T is unity-gain stable with capacitive loads up to 100pF. For larger loads (e.g., long PCB traces or ADC input capacitance), an isolation resistor (e.g., 100Ω) between output and load restores stability. The MAX4291EXK-T's internal compensation eliminates need for external compensation networks in standard configurations.
What is the input protection scheme used in the MAX4291EXK-T?
The MAX4291EXK-T features internal 10.6kΩ series resistors on both inputs plus back-to-back triple-diode clamps. This protects against differential overvoltage events up to ±5.5V. Input resistance is ~0.75MΩ below 1.8V differential, dropping to ~21.2kΩ above that threshold - a behavior documented in the MAX4291EXK-T datasheet for accurate fault-current modeling.
Is the MAX4291EXK-T pin-compatible with other variants in the MAX429x family?
No - the MAX4291EXK-T (single, SC70-5) has a different pinout than the dual MAX4292 or quad MAX4294. While all share functional similarity, only the MAX4291EXK-T maps IN+, IN−, OUT, VEE, and VCC to pins 1–5 in SC70. Substituting other variants requires PCB layout changes due to differing channel count and package footprints.
MAX4291EXK-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 5-TSSOP, SC-70-5, SOT-353
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.2V/µs
- Gain Bandwidth Product:
- 500 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 15 nA
- Voltage - Input Offset:
- 400 µV
- Current - Supply:
- 100µA
- Current - Output / Channel:
- 20 mA
- Voltage - Supply Span (Min):
- 1.8 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-5
MAX4291EXK-T FAQ
1.How can I place an order for MAX4291EXK-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4291EXK-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 MAX4291EXK-T reliable?
The price and inventory of MAX4291EXK-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4291EXK-T is usually 5 days.
3.What payment methods are accepted for MAX4291EXK-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4291EXK-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4291EXK-T?
MAX4291EXK-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4291EXK-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 MAX4291EXK-T?
For technical support, including MAX4291EXK-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4291EXK-T requirements.
6.How does Aetrix verify that MAX4291EXK-T is sourced from the original manufacturer or authorized distributors?
All MAX4291EXK-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 MAX4291EXK-T meets industry standards.
7.What is the process for return or replacement of MAX4291EXK-T?
All MAX4291EXK-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4291EXK-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 MAX4291EXK-T part is unused and in its original packaging.
Return procedure for MAX4291EXK-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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