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Analog Devices Inc./Maxim Integrated MAX4291EUK-T
- Part No.:
- MAX4291EUK-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX4291EUK-T.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,261
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Product details
Overview
The MAX4291EUK-T from Maxim Integrated is a single-channel, micropower, rail-to-rail input/output operational amplifier optimized for ultra-low-voltage, high-precision portable systems. It operates from 1.8V to 5.5V single supply (or ±0.9V to ±2.75V dual), draws only 100µA per amplifier, delivers 500kHz gain-bandwidth, achieves 120dB open-loop voltage gain, and features ±200µV input offset voltage - enabling accurate signal conditioning in two-cell battery-powered instrumentation and sensor interfaces.
For engineers reviewing the MAX4291EUK-T datasheet, MAX4291EUK-T pinout, MAX4291EUK-T application, or MAX4291EUK-T equivalent, key selection criteria include guaranteed 1.8V operation, rail-to-rail I/O swing within 46mV of rails into 2kΩ, unity-gain stability with ≤100pF capacitive loads, no phase reversal on overdriven inputs, and SC70/SOT23-5 package compatibility for space-constrained designs.
Technical Context
The MAX4291EUK-T employs a composite NPN/PNP input stage enabling true rail-to-rail common-mode input range (0V to VCC) and eliminating phase reversal during input overdrive. Its output stage uses complementary push-pull architecture to achieve rail-to-rail swing while sourcing/sinking ≥3.5mA at 1.8V supply.
It is unity-gain stable up to 100pF capacitive load without external compensation and maintains 80dB CMRR and 100dB PSRR across 1.8V–5.5V supply range - critical for precision analog front-ends in decaying-battery environments like digital scales and strain gauge amplifiers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.8V to 5.5V single supply - supports operation down to end-of-life voltage of two alkaline, NiMH, or Li-ion cells. |
| Quiescent Current | 100µA per amplifier - enables multi-year battery life in always-on portable instrumentation. |
| Gain-Bandwidth Product | 500kHz - sufficient for DC-coupled sensor signals (e.g., thermocouples, RTDs) and low-frequency filtering. |
| Input Offset Voltage | ±200µV (max) - 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 constrained. |
| Open-Loop Gain | 120dB (RL = 100kΩ) - enables <1ppm gain error in precision transimpedance or difference amplifier configurations. |
| THD + Noise | 0.017% at 1kHz - suitable for audio preamplification and high-fidelity sensor signal chains. |
Pinout & Package
The MAX4291EUK-T is housed in a 5-pin SOT23-5 package (JEDEC MO-178AA), with exposed pad not electrically connected. Pin 1 is marked by a dot or beveled edge.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN+) | Noninverting Input | Accepts input signals from 0V to VCC; matched impedance required to minimize bias-current-induced offset. |
| 2 (IN−) | Inverting Input | Differential input node; internal 10.6kΩ series resistors provide ESD protection up to ±2kV HBM. |
| 3 (OUT) | Amplifier Output | Drives resistive loads ≥2kΩ or capacitive loads ≤100pF directly; isolation resistor needed for larger CL. |
| 4 (VEE) | Negative Supply | Connected to ground in single-supply mode; must be bypassed with 100nF capacitor to GND. |
| 5 (VCC) | Positive Supply | Accepts 1.8V–5.5V; requires local 100nF ceramic bypass capacitor placed adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-Rail Input/Output | Enables full utilization of 1.8V supply range - no level-shifting needed for microcontroller ADC reference tracking. |
| No Phase Reversal | Prevents latch-up or erroneous output transitions when input exceeds supply rails - critical for unbuffered sensor inputs. |
| Unity-Gain Stable (≤100pF) | Eliminates need for external compensation in photodiode transimpedance or active filter designs. |
| Low Input Bias Current Drift | ±90nA max over temperature - reduces offset drift in high-impedance pH or ion-selective electrode amplifiers. |
| Guaranteed 1.8V Operation | Validated across −40°C to +85°C - ensures reliable startup and function in cold-weather portable medical devices. |
Applications
| 2-Cell Battery Instrumentation | Sensor Signal Conditioning |
|---|---|
Use Scenario: Precision measurement of battery stack current in handheld multimeters or portable data loggers using two AA/AAA cells. IC Role / Device Role / Timing Role: Current-sense amplifier configured in high-side sensing topology with PNP pass transistor feedback. Use Value: Delivers 1V output for 50mA load using R1=2Ω, R2=100kΩ, R3=1MΩ - achieving sub-0.1% gain error despite ±200µV VOS. | Use Scenario: Amplifying low-level mV-range outputs from strain gauges in portable load cells or digital scales. IC Role / Device Role / Timing Role: First-stage instrumentation amplifier with rail-to-rail input enabling direct connection to bridge outputs referenced to VCC/2. Use Value: 120dB open-loop gain and 80dB CMRR suppress common-mode noise from shared battery supply and PCB traces. |
| Portable Medical Sensors | Low-Voltage Audio Preamp |
Use Scenario: Signal conditioning for ECG electrodes or pulse oximetry photodiodes in battery-powered wearable monitors. IC Role / Device Role / Timing Role: Transimpedance amplifier converting photocurrent to voltage with 500kHz GBW supporting >100Hz physiological bandwidth. Use Value: 100µA quiescent current extends operating time beyond 72 hours on two CR2032 cells; rail-to-rail output drives ADC reference directly. | Use Scenario: Microphone preamplifier stage in Bluetooth earbuds or voice-recording pens powered by single Li-ion cell. IC Role / Device Role / Timing Role: Noninverting gain stage with AV = 100, configured for 0.017% THD+N at 1kHz to preserve speech fidelity. Use Value: 46mV output swing margin at 1.8V allows clean clipping-free operation up to 1.754Vpp - maximizing SNR before ADC saturation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV851DBVR | Lower 50µA IQ but only 125kHz GBW; 1.2V min supply; no guaranteed 1.8V performance. | Less suitable for 500kHz sensor filtering or fast-settling current monitoring. | Select when ultra-low power dominates over bandwidth and 1.8V guarantee is noncritical. |
| OPA316IDBVR | Higher 100µA IQ, 10MHz GBW, 1.8V min supply; rail-to-rail I/O but higher VOS (±500µV). | Better for higher-frequency active filters but introduces 2.5× more offset error in precision DC measurements. | Select when bandwidth >1MHz is required and offset trimming is acceptable. |
Compared with TLV851DBVR and OPA316IDBVR, the MAX4291EUK-T uniquely balances 500kHz bandwidth, guaranteed 1.8V operation, and ±200µV VOS in a 5-pin SOT23 - making it optimal for battery-powered instrumentation where accuracy, low voltage, and moderate speed must coexist without calibration.
Availability
The MAX4291EUK-T is available at Aetrix Electronics and suitable for 2-cell battery-operated systems, portable electronic equipment, and battery-powered instrumentation requiring stable component supply across industrial temperature ranges.
Supply support for MAX4291EUK-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, medical, and portable applications.
The MAX4291EUK-T belongs to the MAX4291/MAX4292/MAX4294 family - engineered specifically for ultra-low-voltage, micropower, rail-to-rail I/O operation in space-constrained, battery-powered systems.
FAQ
What is the minimum supply voltage guaranteed for the MAX4291EUK-T?
The MAX4291EUK-T is fully specified and guaranteed to operate from 1.8V to 5.5V single supply across −40°C to +85°C. While typical operation extends down to 1.5V, only the 1.8V minimum is production-tested and warranted. This guarantee ensures reliable function in two-cell alkaline, NiMH, or Li-ion battery stacks at end-of-life voltage.
Can the MAX4291EUK-T drive a 10nF capacitive load directly?
No - the MAX4291EUK-T is unity-gain stable only up to 100pF capacitive load. Driving 10nF directly will cause severe peaking or oscillation. To interface with such loads, place a 100Ω isolation resistor between the MAX4291EUK-T output and the capacitor, as shown in Figure 7a of the datasheet. This preserves stability but introduces gain error due to voltage division.
What is the output voltage swing of the MAX4291EUK-T into a 2kΩ load?
At TA = +25°C with VCC = 1.8V and RL = 2kΩ to VCC/2, the MAX4291EUK-T output swings to within 46mV of both rails - i.e., VOH ≥ 1.754V and VOL ≤ 46mV. This rail-to-rail capability maximizes dynamic range in low-voltage systems and eliminates need for external level-shifting circuitry.
Does the MAX4291EUK-T have phase reversal when inputs exceed the supply rails?
No - the MAX4291EUK-T features a proprietary NPN/PNP composite input stage that prevents phase reversal even when IN+ or IN− is driven beyond VCC or VEE. This behavior is explicitly guaranteed in the datasheet and makes the device robust against transient overvoltage conditions in unbuffered sensor interfaces.
How does the MAX4291EUK-T compare to the MAX4291EXK-T?
The MAX4291EUK-T and MAX4291EXK-T share identical electrical specifications and temperature range (−40°C to +85°C), differing only in package: MAX4291EUK-T uses 5-pin SOT23-5 (JEDEC MO-178AA), while MAX4291EXK-T uses 5-pin SC70 (JEDEC MO-178AB). Both are pin-compatible and functionally interchangeable; choice depends on board layout constraints and assembly capability.
MAX4291EUK-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- 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:
- SOT-23-5
MAX4291EUK-T FAQ
1.How can I place an order for MAX4291EUK-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4291EUK-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 MAX4291EUK-T reliable?
The price and inventory of MAX4291EUK-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4291EUK-T is usually 5 days.
3.What payment methods are accepted for MAX4291EUK-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4291EUK-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4291EUK-T?
MAX4291EUK-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4291EUK-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 MAX4291EUK-T?
For technical support, including MAX4291EUK-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4291EUK-T requirements.
6.How does Aetrix verify that MAX4291EUK-T is sourced from the original manufacturer or authorized distributors?
All MAX4291EUK-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 MAX4291EUK-T meets industry standards.
7.What is the process for return or replacement of MAX4291EUK-T?
All MAX4291EUK-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4291EUK-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 MAX4291EUK-T part is unused and in its original packaging.
Return procedure for MAX4291EUK-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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