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Analog Devices Inc./Maxim Integrated MAX4040ESA-T
- Part No.:
- MAX4040ESA-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX4040ESA-T.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,282
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Product details
Overview
The MAX4040ESA-T from Maxim Integrated is a single-channel, micropower, rail-to-rail input/output operational amplifier optimized for ultra-low-power, low-voltage portable systems. It operates from +2.4V to +5.5V single supply, draws only 10µA quiescent current, delivers 90kHz gain-bandwidth, achieves ±200µV input offset voltage, and swings within 10mV of rails with 100kΩ load - enabling precision signal conditioning in battery-powered sensor front-ends.
For engineers reviewing the MAX4040ESA-T datasheet, MAX4040ESA-T pinout, MAX4040ESA-T application, or MAX4040ESA-T equivalent, key selection criteria include its SOT23-5 package footprint, guaranteed -40°C to +85°C operation, rail-to-rail I/O performance at sub-3V supply, shutdown capability (in MAX4041/MAX4043 variants), and suitability for high-impedance, low-noise amplification where power budget is constrained to <15µA per channel.
Technical Context
The MAX4040ESA-T employs a dual-input-stage architecture-comprising complementary NPN and PNP differential pairs-to achieve true rail-to-rail common-mode input range extending from VEE to VCC. Its output stage uses a current-source/sink topology capable of driving 25kΩ loads while maintaining ≤60mV rail proximity across temperature and supply voltage.
It features no phase reversal under overdriven inputs, unity-gain stability with capacitive loads up to 200pF, and 85dB PSRR-enabling direct connection to decaying battery rails without regulation. Input bias current polarity reverses near mid-supply due to crossover between NPN/PNP stages, requiring matched source impedances at IN+ and IN- to minimize offset error.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +2.4V to +5.5V single supply - supports direct battery operation down to two alkaline cells or one Li-ion cell. |
| Quiescent Current | 10µA per amplifier - enables multi-year operation on coin-cell batteries in always-on sensor nodes. |
| Gain-Bandwidth Product | 90kHz - sufficient for DC–10kHz sensor signals (e.g., strain gauges, thermistors) with stable unity-gain configuration. |
| Input Offset Voltage | ±200µV (typ) - ensures ≤0.2% error in 1V full-scale measurements without trimming. |
| Rail-to-Rail Output Swing | Within 10mV of rails (100kΩ load) - maximizes dynamic range in low-voltage ADC interfaces. |
| Input Common-Mode Range | VEE to VCC - allows direct sensing of ground-referenced or rail-referenced signals without level-shifting. |
| PSRR | 85dB - rejects battery voltage droop during pulsed load events, preserving measurement accuracy. |
Pinout & Package
MAX4040ESA-T is housed in a 5-pin SOT23-5 surface-mount package (JEDEC MO-178AA), with exposed pad not electrically connected. Pin 1 is marked by a dot or beveled edge; pin numbering follows standard SOT23 counterclockwise from the mark.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VEE | Negative supply terminal | Tie to ground in single-supply systems; sets lower rail reference for input common-mode and output swing. |
| 2 - IN− | Inverting input | Differential input node; requires impedance matching to IN+ to minimize bias-current-induced offset. |
| 3 - OUT | Amplifier output | High-impedance state only in shutdown variants (not applicable to MAX4040); drives resistive loads up to 25kΩ. |
| 4 - IN+ | Noninverting input | Differential input node; polarity reversal of input bias current occurs near VCC/2 due to NPN/PNP crossover. |
| 5 - VCC | Positive supply terminal | Accepts +2.4V to +5.5V; bypassing with 100nF capacitor to VEE is mandatory for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input common-mode range | Extends from VEE to VCC - eliminates need for external level shifters when interfacing with ground- or rail-referenced sensors. |
| No phase reversal on overdrive | Prevents latch-up or uncontrolled output transitions during input transients beyond rails - critical for comparator-mode use. |
| Unity-gain stable with 200pF load | Enables direct driving of ADC input capacitance or long PCB traces without external isolation resistors. |
| Low input bias current (±2nA typ) | Minimizes voltage error across high-impedance sources (e.g., pH electrodes, piezoresistive sensors). |
| 200µV input offset voltage | Reduces calibration burden in precision instrumentation; drift of only 2µV/°C maintains accuracy over industrial temperature range. |
Applications
| Strain Gauge Signal Conditioning | Battery-Operated Digital Scale |
|---|---|
Use Scenario: Amplifying mV-level Wheatstone bridge outputs from metal foil strain gauges in handheld load cells. IC Role / Device Role / Timing Role: Precision, low-drift, rail-to-rail op amp configured as an instrumentation amplifier front-end with gain ≥100V/V. Use Value: 10µA supply current extends battery life to >5 years; 200µV offset contributes <0.02% error in 100mV full-scale bridge output. | Use Scenario: Weighing platform using load cells powered by CR2032 coin cell, requiring continuous monitoring with µA-level system budget. IC Role / Device Role / Timing Role: Single-supply signal conditioner converting bridge differential voltage to ADC-compatible 0–VCC range. Use Value: Rail-to-rail I/O enables full utilization of 12-bit ADC input range; 90kHz GBW supports fast settling after mechanical settling. |
| Portable Medical Sensor Front-End | Low-Power Industrial Temperature Monitor |
Use Scenario: Amplifying thermistor or RTD voltage drops in wearable pulse oximeters or glucose meters. IC Role / Device Role / Timing Role: Micropower transducer interface amplifier with high input impedance and low noise density (70nV/√Hz). Use Value: 70nV/√Hz input voltage noise preserves SNR for µV-level thermistor signals; 10mV rail swing maximizes resolution at 3V supply. | Use Scenario: Remote wireless temperature node using thermocouple or semiconductor sensor, powered by energy harvesting or primary battery. IC Role / Device Role / Timing Role: Low-drift, rail-to-rail buffer for cold-junction compensation or sensor excitation circuitry. Use Value: 2µV/°C offset drift ensures <1°C error over -40°C to +85°C; 85dB PSRR rejects noise from switching regulators in same enclosure. |
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 |
|---|---|---|---|
| TLV8512IDR | Higher 500nA input bias current; 350kHz GBW; 25µA supply current - 2.5× higher power draw. | Not suitable for coin-cell lifetime-critical designs; better for higher-speed sensor interfaces where bandwidth >100kHz is required. | Select TLV8512IDR only if additional bandwidth justifies 2.5× higher quiescent current and reduced battery life. |
| OPA316IDBVR | Lower 10µV offset; 10MHz GBW; 400µA supply current - 40× higher power consumption. | Designed for precision analog front-ends with active filtering or driving SAR ADCs; incompatible with multi-year battery operation. | Choose OPA316IDBVR only when sub-10µV offset and MHz-range bandwidth outweigh strict µA-level power constraints. |
Compared with TLV8512IDR and OPA316IDBVR, the MAX4040ESA-T uniquely balances ultra-low 10µA supply current, rail-to-rail I/O, and 90kHz bandwidth - making it the only viable option for decade-long battery life in low-frequency, high-impedance sensor amplification.
Availability
MAX4040ESA-T is available at Aetrix Electronics and suitable for battery-powered medical devices, portable instrumentation, industrial sensor nodes, and energy-harvesting IoT endpoints requiring stable component supply with guaranteed long-term availability.
Supply support for MAX4040ESA-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) is a U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.
The MAX4040ESA-T belongs to the MAX4040–MAX4044 micropower op amp family, designed specifically for ultra-low-power, rail-to-rail signal conditioning in portable and battery-constrained systems operating down to +2.4V.
FAQ
Does the MAX4040ESA-T have a shutdown pin?
No, the MAX4040ESA-T does not include a shutdown function. Shutdown capability is exclusive to the MAX4041 and MAX4043 variants in the same family. The MAX4040ESA-T operates continuously when powered and draws 10µA quiescent current at all times. For applications requiring sleep mode, consider substituting MAX4041ESA or MAX4043ESD with verified pin compatibility and design validation.
What is the maximum capacitive load the MAX4040ESA-T can drive without oscillation?
According to the official datasheet, the MAX4040ESA-T is unity-gain stable with capacitive loads up to 200pF. Driving larger capacitive loads (e.g., >300pF) requires adding an isolation resistor (typically 100Ω–1kΩ) between the output and the load to maintain phase margin. This trade-off reduces gain accuracy but prevents peaking or sustained oscillation observed in Figure 6b of the MAX4040–MAX4044 datasheet.
Can the MAX4040ESA-T be used as a comparator?
Yes, the MAX4040ESA-T can be used as a rail-to-rail input/output comparator, though it is not optimized for speed. Propagation delay ranges from ~20µs to >100µs depending on overdrive voltage (Figure 7). External hysteresis (e.g., via feedback resistor network as shown in Figure 8) is strongly recommended to prevent output oscillation near threshold. Quiescent current rises to ~28–35µA during saturation, which must be accounted for in ultra-low-power budgets.
Is the MAX4040ESA-T pin-compatible with other packages in the MAX4040 family?
The MAX4040ESA-T (SOT23-5) shares identical pinout with the MAX4040EUK-T (also SOT23-5), but is not pin-compatible with the 8-pin µMAX or SO packages (e.g., MAX4040EUA, MAX4040ESA in 8-pin SO). The 5-pin variant has no NC or SHDN pins - only VEE, IN−, OUT, IN+, VCC. Substituting package types requires PCB layout revision and verification of thermal and parasitic effects.
What is the guaranteed operating temperature range for the MAX4040ESA-T?
The MAX4040ESA-T is specified and guaranteed over the extended industrial temperature range of -40°C to +85°C. All electrical characteristics in the datasheet - including supply current, offset voltage, gain-bandwidth, and output swing - are tested and warranted across this full range. No derating or additional qualification is required for deployment in outdoor or uncontrolled-environment industrial applications.
MAX4040ESA-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- 200 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:
- 8-SOIC
MAX4040ESA-T FAQ
1.How can I place an order for MAX4040ESA-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4040ESA-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 MAX4040ESA-T reliable?
The price and inventory of MAX4040ESA-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4040ESA-T is usually 5 days.
3.What payment methods are accepted for MAX4040ESA-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4040ESA-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4040ESA-T?
MAX4040ESA-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4040ESA-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 MAX4040ESA-T?
For technical support, including MAX4040ESA-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4040ESA-T requirements.
6.How does Aetrix verify that MAX4040ESA-T is sourced from the original manufacturer or authorized distributors?
All MAX4040ESA-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 MAX4040ESA-T meets industry standards.
7.What is the process for return or replacement of MAX4040ESA-T?
All MAX4040ESA-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4040ESA-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 MAX4040ESA-T part is unused and in its original packaging.
Return procedure for MAX4040ESA-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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