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Analog Devices Inc./Maxim Integrated MAX4040EUK+T
- Part No.:
- MAX4040EUK+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX4040EUK+T.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,254
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Product details
Overview
The MAX4040EUK+T from Maxim Integrated is a single-channel, micropower, rail-to-rail input/output operational amplifier optimized for battery-powered systems. It operates from a single +2.4V to +5.5V supply, draws only 10µA quiescent current, delivers 90kHz gain-bandwidth product, and achieves output swing within 10mV of both rails with 100kΩ load - enabling full utilization of low-voltage supply headroom in portable sensor signal conditioning.
For engineers reviewing the MAX4040EUK+T datasheet, MAX4040EUK+T pinout, MAX4040EUK+T application, or MAX4040EUK+T equivalent, key selection criteria include ultra-low supply current, guaranteed rail-to-rail I/O performance over –40°C to +85°C, SOT23-5 package footprint, input offset voltage ≤±2.5mV, and unity-gain stability with up to 200pF capacitive load.
Technical Context
The MAX4040EUK+T employs a dual-input-stage architecture combining NPN and PNP differential pairs to achieve true rail-to-rail common-mode input range (VEE to VCC), with crossover at mid-supply. Its output stage uses complementary push-pull transistors capable of sourcing/sinking current to drive loads down to 25kΩ while maintaining rail-to-rail swing.
It features no phase reversal under overdriven inputs, 200µV typical input offset voltage, 70nV/√Hz input voltage noise density, and 68° phase margin - ensuring stable operation in precision DC-coupled and low-frequency AC applications without external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +2.4V to +5.5V single supply - enables direct operation from coin-cell or Li-ion battery without regulation |
| Quiescent Current | 10µA per amplifier - extends battery life in always-on sensor nodes and wearables |
| Gain-Bandwidth Product | 90kHz - supports DC to ~10kHz signal conditioning for strain gauges and temperature sensors |
| Input Offset Voltage | ±2.5mV max (–40°C to +85°C) - ensures <0.1% error in 1V full-scale bridge amplifier designs |
| Rail-to-Rail Output Swing | Within 10mV of rails (100kΩ load) - maximizes dynamic range in 3.3V or lower systems |
| Input Common-Mode Range | VEE to VCC - allows direct sensing of signals referenced to ground or supply rail |
| Capacitive Load Stability | Stable with ≤200pF - eliminates need for isolation resistor in most PCB trace and filter capacitor scenarios |
Pinout & Package
The MAX4040EUK+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; device orientation follows standard SOT23 top-view convention.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VEE | Negative supply terminal | Tie to ground in single-supply operation; defines lower rail for input common-mode and output swing |
| 2 - IN− | Inverting input | Differential input node; internal 2.2kΩ series resistors and diode clamps provide ±1.8V differential protection |
| 3 - OUT | Amplifier output | Rail-to-rail output stage; high-impedance when externally disabled (not applicable - no shutdown pin) |
| 4 - IN+ | Noninverting input | Differential input node; matched bias current behavior with IN− minimizes offset in balanced source impedances |
| 5 - VCC | Positive supply terminal | Accepts +2.4V to +5.5V; PSRR of 85dB allows direct connection to decaying battery voltage |
Key Features
| Feature | Design Value |
|---|---|
| No phase reversal on overdrive | Prevents latch-up and erroneous output states when inputs exceed common-mode range - critical for fault-tolerant sensor interfaces |
| Rail-to-rail input common-mode range | VEE to VCC operation enables direct measurement of ground-referenced or supply-referenced signals without level-shifting circuitry |
| 200µV typical input offset voltage | Reduces zero-error in precision instrumentation amplifiers and low-level transducer signal chains |
| Unity-gain stable with 200pF load | Supports direct driving of ADC input filters, long traces, or bypass caps without destabilizing feedback networks |
| 70nV/√Hz input voltage noise density | Preserves SNR in low-amplitude sensor outputs such as thermopiles and piezoresistive elements |
Applications
| Battery-Powered Sensor Amplifier | Strain Gauge Interface |
|---|---|
Use Scenario: Signal conditioning for MEMS accelerometers and environmental sensors in wireless IoT nodes powered by CR2032 coin cells. IC Role / Device Role / Timing Role: Single-supply op amp configured as noninverting amplifier with gain = 100, providing rail-to-rail output swing and sub-10µA quiescent draw. Use Value: Enables >5-year battery life while preserving full 0–3.0V ADC input range across temperature, due to guaranteed rail-to-rail I/O and low TCVOS (2µV/°C). | Use Scenario: Amplifying mV-level Wheatstone bridge outputs from metal foil strain gauges in portable digital scales and industrial load cells. IC Role / Device Role / Timing Role: Precision DC-coupled amplifier with matched input impedance, rejecting common-mode noise from bridge excitation. Use Value: Delivers <0.05% linearity error over 0–50°C using only passive components, thanks to low input bias current (±10nA max) and rail-to-rail input range. |
| Portable Medical Device Front-End | Low-Voltage Current Monitor |
Use Scenario: Biopotential signal amplification (ECG, EMG) in handheld diagnostic tools operating from single 3.3V LDO. IC Role / Device Role / Timing Role: First-stage instrumentation amplifier input buffer with high CMRR (75dB min) and low input capacitance (3pF). Use Value: Maintains signal integrity with minimal phase shift up to 1kHz, supported by 68° phase margin and 90kHz GBW - avoiding aliasing in 2.5ksps sampling systems. | Use Scenario: High-side current sensing in battery management systems for rechargeable AA/AAA packs. IC Role / Device Role / Timing Role: Transconductance amplifier converting shunt voltage to ground-referenced output using PNP-based current mirror topology. Use Value: Achieves <1% full-scale error at 50mA load with R1=2Ω, R2=100kΩ, R3=1MΩ - consuming only 10µA itself while rejecting supply ripple via 85dB PSRR. |
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 supply current (420nA), but only 12kHz GBW and 2.5mV VOS max; SOT23-5 package | Better for nano-power wake-up circuits; insufficient bandwidth for 1kHz sensor signals | Select TLV851DBVR only when bandwidth demand <15kHz and supply current is primary constraint |
| OPA316IDBVR | Higher supply current (400µA), 10MHz GBW, 0.5mV VOS max; same SOT23-5 footprint | Suitable for higher-speed analog front-ends but increases battery drain 40× | Choose OPA316IDBVR when signal bandwidth exceeds 50kHz and precision offset is critical |
Compared with TLV851DBVR and OPA316IDBVR, the MAX4040EUK+T uniquely balances 90kHz bandwidth, 10µA supply current, and rail-to-rail I/O in a space-constrained SOT23-5 - making it optimal for mid-bandwidth, battery-limited applications like digital scales and portable medical monitors where neither nano-power nor high-speed trade-offs are acceptable.
Availability
The MAX4040EUK+T is available at Aetrix Electronics and suitable for battery-powered sensor amplifiers, strain gauge interfaces, portable medical device front-ends, and low-voltage current monitors requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX4040EUK+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 industrial, medical, communications, and consumer applications.
The MAX4040EUK+T belongs to the MAX4040–MAX4044 micropower rail-to-rail op amp family, engineered specifically for ultra-low-power, low-voltage signal conditioning in portable and battery-operated equipment.
FAQ
What is the maximum capacitive load the MAX4040EUK+T can drive without oscillation?
The MAX4040EUK+T is unity-gain stable with capacitive loads up to 200pF, as confirmed in the datasheet's "Capacitive-Load Stability" specification. This includes PCB trace capacitance, ADC input capacitance, and small ceramic bypass caps. For loads exceeding 200pF, an isolation resistor (e.g., 1kΩ) between the MAX4040EUK+T output and the capacitive load restores stability, though it introduces gain error due to voltage division.
Does the MAX4040EUK+T have a shutdown pin?
No, the MAX4040EUK+T does not include a shutdown pin. Shutdown functionality is only available on the MAX4041 and MAX4043 variants in the same family. The MAX4040EUK+T operates continuously when powered and draws 10µA per amplifier under normal conditions - making it ideal for always-on monitoring applications where external enable control is unnecessary.
What is the input common-mode voltage range of the MAX4040EUK+T?
The MAX4040EUK+T has a rail-to-rail input common-mode voltage range extending from VEE to VCC, as explicitly specified in the Electrical Characteristics table. This allows the device to accurately amplify signals referenced to ground (in single-supply mode) or to either supply rail - a critical capability for interfacing with bridge sensors, current-sense amplifiers, and other circuits where input signals approach supply limits.
Can the MAX4040EUK+T be used as a comparator?
Yes, the MAX4040EUK+T can be used as a rail-to-rail input/output comparator in open-loop configuration. Propagation delay is typically 20–50µs depending on overdrive voltage (per Figure 7). However, quiescent current rises to ~28–35µA during saturation, and external hysteresis (e.g., positive feedback network) is recommended to prevent oscillation near threshold - unlike purpose-built comparators, the MAX4040EUK+T lacks built-in hysteresis or speed optimization.
What is the guaranteed operating temperature range for the MAX4040EUK+T?
The MAX4040EUK+T is fully specified and guaranteed over the extended industrial temperature range of –40°C to +85°C. All key parameters - including input offset voltage (±3.5mV max), supply current (10µA typ), and output swing - are tested and warranted across this range, making it suitable for deployment in outdoor, automotive cabin, and industrial environments without derating.
MAX4040EUK+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:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.04V/µs
- Gain Bandwidth Product:
- 90 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 2 nA
- Voltage - Input Offset:
- 250 µV
- Current - Supply:
- 14µA
- Current - Output / Channel:
- 2.5 mA
- Voltage - Supply Span (Min):
- 2.4 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
MAX4040EUK+T FAQ
1.How can I place an order for MAX4040EUK+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4040EUK+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 MAX4040EUK+T reliable?
The price and inventory of MAX4040EUK+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4040EUK+T is usually 5 days.
3.What payment methods are accepted for MAX4040EUK+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4040EUK+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4040EUK+T?
MAX4040EUK+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4040EUK+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 MAX4040EUK+T?
For technical support, including MAX4040EUK+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4040EUK+T requirements.
6.How does Aetrix verify that MAX4040EUK+T is sourced from the original manufacturer or authorized distributors?
All MAX4040EUK+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 MAX4040EUK+T meets industry standards.
7.What is the process for return or replacement of MAX4040EUK+T?
All MAX4040EUK+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4040EUK+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 MAX4040EUK+T part is unused and in its original packaging.
Return procedure for MAX4040EUK+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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