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Analog Devices Inc./Maxim Integrated MAX40079AUT+T
- Part No.:
- MAX40079AUT+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-6
- Datasheet:
-
MAX40079AUT+T.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT SOT6
- Quantity:
- Payment:
- Shipping:
Inventory:2,003
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Product details
Overview
MAX40079AUT+T from Analog Devices is a single-channel, unity-gain stable, ultra-low-input-bias-current operational amplifier optimized for high-impedance sensor interfaces. It delivers 4.2nV/√Hz input voltage noise density at 30kHz, 0.3pA typical input bias current, and 10MHz gain bandwidth - enabling precision transimpedance amplification in photodiode and pH probe circuits operating from 2.7V to 5.5V single supply.
For engineers reviewing the MAX40079AUT+T datasheet, MAX40079AUT+T pinout, MAX40079AUT+T application, or MAX40079AUT+T equivalent, this page provides verified electrical specifications, validated WLP/SOT23 package details, confirmed rail-to-rail output behavior under 1kΩ load, and real-world TIA and ADC buffer use cases - all extracted from the official MAX40079 datasheet (Rev 10, Oct 2021).
Technical Context
The MAX40079AUT+T employs a CMOS input stage with 1000GΩ input resistance and integrated 60Ω series input protection resistors paired with back-to-back ESD diodes. Its internal compensation ensures unity-gain stability while maintaining 70° phase margin and 3V/µs slew rate - critical for preserving signal fidelity in low-distortion (<0.00035% THD+N) applications like medical instrumentation and 16-bit ADC buffering.
It supports true rail-to-rail output swing (within 8mV of rails at 10kΩ load), operates across –40°C to +125°C, and features a shutdown pin (SHDN) that reduces quiescent current to 0.4µA - making it suitable for battery-powered, high-precision analog front-ends where leakage, noise, and thermal drift must be minimized.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth Product | 10MHz - enables stable unity-gain operation with sufficient loop gain for precision DC-coupled signal conditioning. |
| Input Voltage Noise Density | 4.2nV/√Hz at 30kHz - ensures minimal added noise when amplifying microvolt-level signals from high-Z sources. |
| Input Bias Current | 0.3pA (typ) - allows accurate measurement of picoamp-level photocurrents without significant error from input leakage. |
| THD+N | –109dB (0.00035%) at 1kHz, 1kΩ load - preserves dynamic range in audio and instrumentation-grade signal chains. |
| Rail-to-Rail Output Swing | Within 80mV of VDD/VSS at 1kΩ load - maximizes usable output voltage range in low-voltage (2.7–5.5V) systems. |
| Input Common-Mode Range | Extends to VSS – 0.1V and up to VDD – 1.5V - supports ground-referenced sensing and low-side current monitoring. |
| Quiescent Supply Current | 2.2mA per amplifier at 3.3V - balances low-noise performance with power efficiency in portable equipment. |
Pinout & Package
MAX40079AUT+T is available in two production packages: 6-pin SOT23 (package code U6+1) and 6-bump wafer-level package (WLP, package code N60F1+1, 1.31mm × 0.73mm, 0.35mm bump pitch). Both are RoHS-compliant and rated for –40°C to +125°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SOT23) / A3 (WLP) | OUT | Amplifier output - drives loads down to 1kΩ while maintaining rail-to-rail swing and <30µV offset. |
| 2 (SOT23) / A2 (WLP) | VSS | Negative supply terminal - tied to 0V in single-supply configurations; input common-mode extends below this node. |
| 3 (SOT23) / A1 (WLP) | INA+ | Non-inverting input - high-impedance (1000GΩ), low-leakage node for connecting reference electrodes or sensor outputs. |
| 4 (SOT23) / B1 (WLP) | INA− | Inverting input - matched to INA+; used with feedback network to set gain and configure transimpedance operation. |
| 5 (SOT23) / B2 (WLP) | SHDN | Active-low shutdown control - pulls output to high-Z and reduces IDD to 0.4µA; requires external pull-up for normal operation. |
| 6 (SOT23) / B3 (WLP) | VDD | Positive supply input - accepts 2.7V to 5.5V; PSRR >90dB ensures immunity to supply ripple in noisy environments. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low input bias current | 0.3pA typ - enables accurate readout of pA-level currents from photodiodes and ion-selective electrodes without calibration drift. |
| Low 1/f noise | 1.7µVPP (0.1Hz–10Hz) - critical for DC-stable measurements in pH meters and strain gauge bridges requiring long integration times. |
| Rail-to-rail output with 1kΩ drive | VOH ≤ 200mV from VDD, VOL ≤ 150mV from VSS - preserves full-scale resolution in 3.3V/5V data acquisition systems. |
| Integrated input protection | 60Ω series resistors + back-to-back ESD diodes - withstands ±6V transient differential input without latch-up or parametric shift. |
| Shutdown mode | 0.4µA supply current, high-Z output - extends battery life in intermittent-sampling portable instruments without external isolation switches. |
Applications
| Transimpedance Amplifier (TIA) | pH Probe Interface |
|---|---|
|
Use Scenario: Converting nanoampere photocurrent from a silicon photodiode into a measurable voltage signal in optical sensing. IC Role / Device Role / Timing Role: Precision transimpedance amplifier with ultra-low input bias current and low voltage noise to minimize Johnson and shot noise contributions. Use Value: Enables sub-picoamp current resolution and >100dB dynamic range in spectrophotometers and pulse oximeters. |
Use Scenario: Buffering mV-level potentials from glass pH electrodes in laboratory analyzers and industrial process controllers. IC Role / Device Role / Timing Role: Unity-gain voltage follower isolating high-impedance electrode output from downstream ADC input capacitance. Use Value: Prevents measurement drift caused by input bias current loading the electrode's >1GΩ source impedance. |
| ADC Input Buffer | Medical Instrumentation Front-End |
|
Use Scenario: Driving the switched-capacitor input of a 16-bit SAR ADC in a portable ECG monitor. IC Role / Device Role / Timing Role: Low-noise, low-distortion buffer ensuring full-scale accuracy and minimizing harmonic corruption of biopotential waveforms. Use Value: Maintains ENOB >15.2 bits by contributing <0.00035% THD+N and 4.2nV/√Hz noise at 1kHz. |
Use Scenario: Signal conditioning stage in a Class IIa medical infusion pump for pressure sensor feedback and motor current sensing. IC Role / Device Role / Timing Role: Dual-role amplifier supporting both ground-sensing current measurement (via IN+ referenced to VSS) and rail-to-rail output to isolated sigma-delta modulator. Use Value: Meets IEC 60601-1 creepage/clearance requirements via 6-bump WLP footprint and operates reliably over full medical temperature range (–40°C to +125°C). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultra-low-input-bias-current op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC6268IS6#TRMPBF | Lower input bias current (0.5fA typ), higher GBW (500MHz), but higher supply current (3.2mA) and no shutdown pin. | Better for GHz-bandwidth photodiode amps; unsuitable where low-power shutdown or 10MHz-optimized stability is required. | Select MAX40079AUT+T when balancing ultra-low bias current with power efficiency, rail-to-rail output, and integrated SHDN control. |
| OPA377AIDBVR | Higher input bias current (10pA), lower noise (4nV/√Hz), no shutdown, wider supply range (2.2–5.5V). | Suitable for cost-sensitive industrial sensors where pA-level leakage is not critical; lacks TIA-optimized input protection. | Choose MAX40079AUT+T for applications demanding sub-pA bias current, integrated input ESD protection, and guaranteed phase reversal immunity. |
Compared with LTC6268IS6#TRMPBF and OPA377AIDBVR, the MAX40079AUT+T uniquely combines 0.3pA input bias current, 10MHz unity-gain bandwidth, rail-to-rail output swing into 1kΩ, and active shutdown - making it the optimal choice for battery-powered, high-impedance sensor interfaces requiring long-term DC stability and low distortion.
Availability
MAX40079AUT+T is available at Aetrix Electronics and suitable for transimpedance amplifier designs, pH probe signal conditioning, and medical instrumentation front-ends requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for MAX40079AUT+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
Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The MAX40079AUT+T belongs to the MAX4007x family of ultra-low-input-bias-current, low-noise op-amps engineered specifically for high-impedance sensor interfacing - including photodiodes, reference electrodes, and piezoelectric transducers - where leakage, noise, and DC accuracy dominate system performance.
FAQ
What is the maximum capacitive load the MAX40079AUT+T can drive without oscillation?
The MAX40079AUT+T is stable driving capacitive loads up to 200pF without external compensation. This capability is verified across temperature and supply voltage ranges, enabling direct connection to ADC input capacitors and long PCB traces without risk of peaking or ringing. For loads exceeding 200pF, a feed-forward capacitor (CZ) between IN− and OUT is recommended per the datasheet formula CZ = 10 × (RF/RG) pF.
Does the MAX40079AUT+T support true rail-to-rail input common-mode range?
No - the MAX40079AUT+T supports rail-to-rail *output* swing, but its input common-mode voltage range extends from VSS – 0.1V to VDD – 1.5V. This allows ground-referenced inputs and low-side sensing, but does not include the positive rail. The device is guaranteed not to phase-reverse when inputs exceed the common-mode range, unlike many competing amplifiers.
Can the MAX40079AUT+T be used as a comparator?
No - the MAX40079AUT+T is not designed for open-loop comparator operation. Its internal differential input protection (60Ω resistors + back-to-back diodes) prevents safe use beyond ±6V differential input, and the amplifier lacks internal hysteresis or fast recovery from saturation. Dedicated comparators such as the MAX9060 should be used instead.
What is the thermal resistance (θJA) of the MAX40079AUT+T in the 6-bump WLP package?
The junction-to-ambient thermal resistance (θJA) for the MAX40079AUT+T in the 6-bump WLP (N60F1+1) package is 98.06°C/W on a four-layer board, per JEDEC JESD51-7 test conditions. This value assumes standard copper pour and thermal vias; actual board layout will affect real-world thermal performance.
Is the MAX40079AUT+T pin-compatible with other devices in the MAX4007x family?
Yes - the MAX40079AUT+T shares identical pinout and footprint with the MAX40087AUT+T (gain ≥5 stable version) in both SOT23-6 and 6-bump WLP packages. This allows design reuse across bandwidth-critical (42MHz) and unity-gain-stable (10MHz) variants without PCB revision, provided gain configuration and stability requirements are verified.
MAX40079AUT+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- Push-Pull, Rail-to-Rail
- Slew Rate:
- 10V/µs
- Gain Bandwidth Product:
- 42 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 0.3 pA
- Voltage - Input Offset:
- 30 µV
- Current - Supply:
- 2.5mA
- Current - Output / Channel:
- 40 mA
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-6
MAX40079AUT+T FAQ
1.How can I place an order for MAX40079AUT+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX40079AUT+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 MAX40079AUT+T reliable?
The price and inventory of MAX40079AUT+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX40079AUT+T is usually 5 days.
3.What payment methods are accepted for MAX40079AUT+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX40079AUT+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX40079AUT+T?
MAX40079AUT+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX40079AUT+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 MAX40079AUT+T?
For technical support, including MAX40079AUT+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX40079AUT+T requirements.
6.How does Aetrix verify that MAX40079AUT+T is sourced from the original manufacturer or authorized distributors?
All MAX40079AUT+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 MAX40079AUT+T meets industry standards.
7.What is the process for return or replacement of MAX40079AUT+T?
All MAX40079AUT+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX40079AUT+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 MAX40079AUT+T part is unused and in its original packaging.
Return procedure for MAX40079AUT+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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