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Analog Devices Inc./Maxim Integrated MAX4042ESA-T
- Part No.:
- MAX4042ESA-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX4042ESA-T.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,801
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Product details
Overview
The MAX4042ESA-T from Maxim Integrated is a dual micropower rail-to-rail input/output operational amplifier optimized for single-supply battery-powered systems. It operates from +2.4V to +5.5V, draws only 10µA per amplifier, delivers 90kHz gain-bandwidth, and swings within 10mV of rails with 100kΩ load - enabling precision signal conditioning in portable medical sensors and low-voltage data acquisition.
For engineers reviewing the MAX4042ESA-T datasheet, MAX4042ESA-T pinout, MAX4042ESA-T application, or MAX4042ESA-T equivalent, key selection criteria include ultra-low supply current (10µA), rail-to-rail I/O capability, guaranteed operation over –40°C to +85°C, dual-channel configuration in 8-pin SO package, and absence of shutdown functionality (unlike MAX4041/MAX4043).
Technical Context
The MAX4042ESA-T implements a composite NPN/PNP rail-to-rail input stage with crossover at mid-supply, delivering 200µV typical input offset voltage and 45MΩ differential input resistance below 1.8V differential input. Its output stage uses complementary push-pull architecture capable of sourcing/sinking current to drive 25kΩ loads while maintaining rail-to-rail swing.
It features no phase reversal under overdriven inputs, unity-gain stability with up to 200pF capacitive loads, and high open-loop gain (94dB typ) - making it suitable for low-noise, low-offset DC-coupled amplification without external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +2.4V to +5.5V single supply - supports direct connection to decaying Li-ion or alkaline battery stacks without regulation. |
| Supply Current per Amp | 10µA - enables multi-year operation on coin-cell batteries in always-on sensor front-ends. |
| Gain-Bandwidth Product | 90kHz - sufficient for DC–10kHz biosignal amplification (ECG, EEG) and strain gauge readout. |
| Input Offset Voltage | ±0.25mV max - ensures sub-10µV error in 100mV full-scale bridge sensor outputs. |
| Rail-to-Rail Output Swing | Within 10mV of VEE/VCC at 100kΩ - maximizes dynamic range in 3.3V or lower ADC interfaces. |
| Input Common-Mode Range | VEE to VCC - allows direct sensing of signals referenced to ground or supply rail in single-supply topologies. |
| Operating Temperature | –40°C to +85°C - qualified for industrial and automotive cabin ambient environments. |
Pinout & Package
MAX4042ESA-T is housed in an 8-pin SO (Small Outline) package, 150mil width, with standard JEDEC MS-012AC footprint and gull-wing leads. Pin 1 is marked with a beveled corner or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUTA | Amplifier A output - high-impedance when unused; drives 25kΩ load to within 60mV of rails. |
| 2 | IN- | Inverting input - protected by 2.2kΩ series resistors and back-to-back diode clamps. |
| 3 | IN+ | Noninverting input - matched impedance critical to minimize bias-current-induced offset. |
| 4 | VEE | Negative supply - tied to GND for single-supply operation; substrate connected internally. |
| 5 | VCC | Positive supply - requires 100nF ceramic bypass capacitor to VEE for stability. |
| 6 | IN+ | Noninverting input for Amplifier B - electrically isolated from IN+ of Amp A (no crosstalk path). |
| 7 | IN- | Inverting input for Amplifier B - independent bias current path; not shared with Amp A. |
| 8 | OUTB | Amplifier B output - identical performance to OUTA; channel-to-channel isolation >80dB @ 1kHz. |
Key Features
| Feature | Design Value |
|---|---|
| No phase reversal on overdrive | Prevents latch-up or erroneous output states when input exceeds common-mode range - critical for fault-tolerant sensor interfaces. |
| Rail-to-rail input common-mode range | Enables direct amplification of ground-referenced or supply-referenced signals without level-shifting circuitry. |
| Unity-gain stable with 200pF load | Eliminates need for external compensation when driving ADC input capacitance or long PCB traces. |
| Low input bias current (±2nA typ) | Minimizes voltage error across high-impedance sources like pH electrodes or piezoresistive sensors. |
| High CMRR (85dB min) | Rejects power-supply ripple and EMI coupling in noisy embedded environments - e.g., motor-driven portable tools. |
Applications
| Portable Medical Sensors | Industrial Strain Gauge Readout |
|---|---|
Use Scenario: Amplifying microvolt-level signals from wearable ECG electrodes powered by CR2032 coin cell. IC Role / Device Role / Timing Role: Dual-channel DC-coupled instrumentation amplifier front-end with one channel for lead-I and one for lead-II derivation. Use Value: 10µA per amplifier extends battery life beyond 3 years; rail-to-rail output fully utilizes 12-bit SAR ADC input range. | Use Scenario: Signal conditioning for quarter-bridge strain gauges in handheld torque wrenches. IC Role / Device Role / Timing Role: Low-drift, low-power buffer and gain stage interfacing Wheatstone bridge to sigma-delta ADC. Use Value: ±0.25mV input offset ensures <0.1% full-scale error at 2mV/V bridge sensitivity; 90kHz GBW supports fast calibration sweeps. |
| Battery Stack Current Monitoring | Low-Voltage Digital Scale Front-End |
Use Scenario: High-side current sensing across shunt resistor in 3-cell Li-ion pack for state-of-charge estimation. IC Role / Device Role / Timing Role: Precision difference amplifier configured as current-sense amplifier with gain set by external resistors. Use Value: Rail-to-rail input accepts common-mode voltages up to VCC; 200µV offset minimizes zero-current error at µA-level sleep currents. | Use Scenario: Amplifying mV-level output from load-cell transducers in battery-powered kitchen scales. IC Role / Device Role / Timing Role: Dual-op-amp stage: first for bridge excitation buffering, second for differential gain and filtering. Use Value: Dual configuration reduces component count vs. discrete op-amps; 85°C rating ensures reliability during repeated thermal cycling in home environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual micropower rail-to-rail op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMV358IDR | Higher supply current (80µA/amp), wider supply range (2.7V–5.5V), no rail-to-rail input (CMVR = VEE to VCC–1.2V) | Not suitable for sub-2.7V battery operation or ground-sensed signals; requires level-shifting for single-supply bridge amps | Select only if higher speed (1MHz GBW) or higher drive strength is required and supply ≥2.7V is guaranteed. |
| MCP6022-E/SN | Lower supply current (100nA typ), but lower GBW (10kHz), higher input offset (250µV max), same rail-to-rail I/O | Better for nanoamp-biased photodiode amps; insufficient bandwidth for fast strain gauge settling or ECG slew rates | Prefer for ultra-low-power, low-bandwidth sensor nodes where 10kHz response suffices and offset tolerance >250µV is acceptable. |
Compared with LMV358IDR and MCP6022-E/SN, the MAX4042ESA-T uniquely balances 10µA supply current, 90kHz bandwidth, rail-to-rail input down to 2.4V, and ±0.25mV offset - making it optimal for precision, battery-constrained analog front-ends where all four parameters are simultaneously critical.
Availability
MAX4042ESA-T is available at Aetrix Electronics and suitable for portable medical devices, industrial handheld test equipment, and battery-powered weighing systems requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for MAX4042ESA-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 communications applications.
The MAX4040–MAX4044 family was engineered specifically for micropower, rail-to-rail signal conditioning in space- and energy-constrained portable electronics - emphasizing low-voltage operation, minimal quiescent current, and robust input protection.
FAQ
Does the MAX4042ESA-T include a shutdown feature?
No, the MAX4042ESA-T does not have a shutdown pin. Unlike the MAX4041 and MAX4043 variants, the MAX4042ESA-T lacks SHDN functionality and operates continuously when powered. This simplifies design for always-on applications but precludes dynamic power gating. The MAX4042ESA-T draws 10µA per amplifier regardless of signal activity, and its outputs remain active at all times.
What is the maximum capacitive load the MAX4042ESA-T can drive without oscillation?
The MAX4042ESA-T is unity-gain stable with capacitive loads up to 200pF when driving a resistive load ≥10kΩ. For heavier capacitive loads (e.g., >500pF), an isolation resistor (RISO = 100Ω–1kΩ) must be placed in series with the output to maintain stability. This configuration trades off gain accuracy (due to RISO–RL voltage division) for reliable step response, as confirmed in Figure 6c of the MAX4042ESA-T datasheet.
Can the MAX4042ESA-T be used as a comparator?
Yes, the MAX4042ESA-T can function as a rail-to-rail input/output comparator, though it is not optimized for speed. Propagation delay is ~200µs for 10mV overdrive at +2.4V supply (Figure 7). External hysteresis (e.g., via positive feedback resistor network) is strongly recommended to prevent oscillation near threshold. Quiescent current rises to ~28–35µA during saturation, which remains acceptable for intermittent-compare applications in low-duty-cycle systems.
Is the MAX4042ESA-T pin-compatible with other packages in the MAX4040–MAX4044 family?
No, the MAX4042ESA-T (8-pin SO) is not pin-compatible with the MAX4040 in SOT23-5 or the MAX4043/MAX4044 in µMAX or SO packages. While all share functional similarity, pin assignments differ significantly - e.g., MAX4042ESA-T places both IN+ inputs on pins 3 and 6, whereas MAX4043 uses pins 5 and 11. PCB layout must be tailored to the specific package; no mechanical or electrical drop-in replacement exists across the family.
What is the input protection scheme on the MAX4042ESA-T?
The MAX4042ESA-T employs internal 2.2kΩ series resistors on both inputs plus back-to-back triple-diode clamps between IN+ and IN−. Below 1.8V differential input, input resistance remains ~45MΩ. Above 1.8V, resistance drops exponentially to ~4.4kΩ, limiting fault current per the equation IBIAS = (VDIFF − 1.8V)/4.4kΩ. This protects against ESD and transient overvoltage while preserving low bias current in normal operation.
MAX4042ESA-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:
- 2
- 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 (x2 Channels)
- 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
MAX4042ESA-T FAQ
1.How can I place an order for MAX4042ESA-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4042ESA-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 MAX4042ESA-T reliable?
The price and inventory of MAX4042ESA-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4042ESA-T is usually 5 days.
3.What payment methods are accepted for MAX4042ESA-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4042ESA-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4042ESA-T?
MAX4042ESA-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4042ESA-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 MAX4042ESA-T?
For technical support, including MAX4042ESA-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4042ESA-T requirements.
6.How does Aetrix verify that MAX4042ESA-T is sourced from the original manufacturer or authorized distributors?
All MAX4042ESA-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 MAX4042ESA-T meets industry standards.
7.What is the process for return or replacement of MAX4042ESA-T?
All MAX4042ESA-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4042ESA-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 MAX4042ESA-T part is unused and in its original packaging.
Return procedure for MAX4042ESA-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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