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Analog Devices Inc./Maxim Integrated MAX40077AUA+
- Part No.:
- MAX40077AUA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX40077AUA+.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:1,027
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Product details
Overview
MAX40077AUA+ from Analog Devices is a single-channel, unity-gain stable, ultra-low-input-bias-current operational amplifier optimized for transimpedance and high-impedance sensor signal conditioning. It delivers 4.2nV/√Hz input voltage noise density at 30kHz, 0.3pA typical input bias current, and 10MHz gain bandwidth product while operating from 2.7V to 5.5V single supply - enabling precision pH probe front-ends and photodiode TIA designs.
For engineers reviewing the MAX40077AUA+ datasheet, MAX40077AUA+ pinout, MAX40077AUA+ application, or MAX40077AUA+ equivalent, this page provides verified technical context, package-specific pin mapping, real-world application cards, and two validated alternative op amps with documented functional trade-offs for low-noise, rail-to-rail output, ground-sensing amplifier selection.
Technical Context
The MAX40077AUA+ is a unity-gain stable, single-channel op amp in the MAX40079/MAX40077/MAX40078 family, featuring a fully differential input stage with input common-mode range extending 0.2V below VSS and up to VDD – 1.5V. Its push-pull output stage supports rail-to-rail swing into 1kΩ loads while maintaining DC accuracy and ±20mA output drive capability.
It achieves 0.00035% THD+N (–109dB) at 1kHz with 1kΩ load, 30μV max input offset voltage, and 0.3μV/°C typical offset drift over –40°C to +125°C. The 7pF input capacitance and internal 60Ω series resistors enable robust ESD protection but preclude open-loop comparator use.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth Product | 10MHz - enables stable unity-gain buffering of signals up to ~1MHz with adequate phase margin |
| Input Voltage Noise Density | 4.2nV/√Hz at 30kHz - critical for preserving SNR in ADC buffer and microphone preamp stages |
| Input Bias Current | 0.3pA (typ) - allows direct interfacing with >1GΩ source impedances (e.g., pH electrodes, photodiodes) |
| THD+N | –109dB (0.00035%) at 1kHz, 1kΩ load - ensures minimal harmonic corruption in precision DAC output amplification |
| Rail-to-Rail Output Swing | Within 80mV of rails into 1kΩ - maximizes dynamic range in 3.3V or 5V systems without level-shifting circuitry |
| Supply Range | +2.7V to +5.5V single supply - compatible with standard logic rails and battery-powered instrumentation |
| Operating Temperature | –40°C to +125°C - qualified for automotive under-hood and industrial process control environments |
Pinout & Package
MAX40077AUA+ is packaged in a 6-pin SOT23 (package code U6+1), with exposed pad thermal enhancement. Pin 1 is marked by a dot; pin numbering follows standard SOT23 convention (counterclockwise from mark).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT | Amplifier output - drives loads down to 1kΩ while maintaining rail-to-rail swing and DC accuracy |
| 2 | VSS | Negative supply (0V in single-supply) - must be connected directly to clean ground plane for noise-sensitive applications |
| 3 | IN+ | Non-inverting input - accepts common-mode voltages from –0.2V to VDD – 1.5V, enabling true ground-sensing |
| 4 | IN– | Inverting input - matched to IN+ for CMRR >87dB; protected by 60Ω series resistors and back-to-back diodes |
| 5 | SHDN | Active-low shutdown - pulls to VSS to reduce quiescent current to 0.4μA; leaves output in high-Z state |
| 6 | VDD | Positive supply - decoupling capacitor (≥100nF) required within 2mm of pin for stability at full bandwidth |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low input bias current | 0.3pA typ - eliminates voltage error across high-impedance sources like reference electrodes and piezoelectric sensors |
| Low 1/f noise | 1.7μVPP integrated (0.1Hz–10Hz) - essential for DC-stable pH measurement and strain gauge amplification |
| Rail-to-rail output with 1kΩ drive | Output swings to within 80mV of VDD/VSS into 1kΩ - preserves full-scale resolution in low-voltage data acquisition |
| EMI rejection ratio | 55dB at 2.4GHz - mitigates RF interference in medical and industrial environments near wireless transceivers |
| Stable capacitive load drive | Up to 50pF without oscillation - simplifies layout for PCB traces and sensor cable capacitance in TIA configurations |
Applications
| Transimpedance Amplifier (TIA) | pH Probe Front-End |
|---|---|
Use Scenario: Converting photocurrent from a silicon photodiode (10pF–100pF junction capacitance) into precise voltage output for optical sensing. IC Role / Device Role / Timing Role: Transimpedance amplifier with virtual-ground input node; sets gain via feedback resistor while rejecting dark current. Use Value: 0.3pA input bias current prevents DC offset error; 4.2nV/√Hz noise density maintains >14-bit ENOB at 100kHz bandwidth. |
Use Scenario: Buffering millivolt-level Nernst potential from glass pH electrode in lab-grade analyzers or water quality monitors. IC Role / Device Role / Timing Role: Unity-gain voltage follower with ultra-high input impedance (>1000GΩ) to prevent loading of high-resistance electrode. Use Value: Input bias current <1pA avoids >10mV error across 10GΩ electrode resistance; rail-to-rail output maximizes ADC utilization. |
| ADC Input Buffer | Medical ECG Signal Conditioning |
Use Scenario: Driving SAR or sigma-delta ADC inputs in portable data loggers requiring low power and high linearity. IC Role / Device Role / Timing Role: Low-distortion, low-noise buffer isolating ADC sample-and-hold from noisy analog front-end circuitry. Use Value: –109dB THD+N ensures <0.00035% harmonic distortion; 10MHz GBW supports settling in <2µs for 16-bit conversion. |
Use Scenario: Amplifying microvolt-level biopotential signals from dry-electrode ECG patches in wearable health monitors. IC Role / Device Role / Timing Role: First-stage instrumentation amplifier input buffer with ground-referenced common-mode range. Use Value: Input common-mode extends to –0.2V (below ground), enabling true low-side current sensing; 120dB PSRR rejects power supply ripple. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise, low-input-bias-current operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA377AIDBVR | Higher input bias current (0.5pA typ), lower GBW (9MHz), no shutdown pin | Lacks SHDN functionality; less suitable for battery-powered TIA where sleep mode reduces system current | Choose when cost sensitivity outweighs need for sub-0.4pA bias current and active shutdown control |
| LTC6268IS6#TRMPBF | Lower input bias current (0.05pA typ), higher GBW (500MHz), higher supply current (3.2mA) | Overkill for 10MHz applications; excessive power draw in portable instrumentation | Choose only when sub-0.1pA bias and >100MHz bandwidth are mandatory - otherwise adds unnecessary cost and thermal load |
Compared with OPA377AIDBVR and LTC6268IS6#TRMPBF, MAX40077AUA+ offers the optimal balance of 0.3pA input bias, 10MHz bandwidth, 2.2mA quiescent current, and integrated shutdown - making it the most practical choice for portable, precision, ground-sensing sensor interfaces where power, noise, and size are co-constrained.
Availability
MAX40077AUA+ is available at Aetrix Electronics and suitable for transimpedance amplifier designs, pH probe instrumentation, and medical ECG front-ends requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for MAX40077AUA+ 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 precision instrumentation, industrial automation, and healthcare markets.
MAX40077AUA+ belongs to the MAX4007x ultra-low-input-bias-current op amp family, engineered specifically for high-impedance sensor interfacing - including photodiodes, reference electrodes, and piezoelectric transducers - where leakage current and voltage noise dominate system error budgets.
FAQ
What is the maximum capacitive load the MAX40077AUA+ can drive without instability?
The MAX40077AUA+ is specified to remain stable with up to 50pF capacitive load at the output, per its Electrical Characteristics table. This value applies under standard test conditions (RL = 10kΩ, CL = 10pF). For heavier capacitive loads - such as long PCB traces or coaxial cables in TIA applications - external compensation (e.g., feed-forward capacitor CZ) may be required. Always verify stability with actual layout parasitics using small-signal pulse response testing.
Does the MAX40077AUA+ support true ground-sensing operation?
Yes. The MAX40077AUA+ guarantees an input common-mode voltage range extending to –0.2V below VSS (ground) at +25°C and –0.1V below VSS over the full –40°C to +125°C range. This enables accurate low-side current sensing and direct interfacing with sensors whose output references below ground - a key requirement in pH probes and certain medical biopotential circuits.
Can the MAX40077AUA+ be used in a transimpedance amplifier without external compensation?
Yes - but only for moderate-bandwidth TIAs (≤100kHz) with photodiode junction capacitance ≤20pF and feedback resistors ≤10MΩ. The MAX40077AUA+'s 10MHz GBW and internal compensation allow stable unity-gain operation; however, for higher-speed or higher-capacitance photodiodes, a feed-forward capacitor (CZ) between IN– and OUT is recommended to maintain phase margin above 70°.
What is the shutdown current consumption of the MAX40077AUA+?
The MAX40077AUA+ draws 0.4μA typical supply current in shutdown mode (SHDN = VSS), as specified in its Electrical Characteristics table. During shutdown, the output enters a high-impedance state, and internal bias circuitry is disabled - making it suitable for battery-powered devices requiring ultra-low standby power. Note that power-up time is 13μs, ensuring fast wake-up for event-triggered sensing.
Is the MAX40077AUA+ pin-compatible with other op amps in the MAX4007x family?
No. The MAX40077AUA+ uses the 6-pin SOT23 package (U6+1), while the dual-channel MAX40077 uses 8-pin μMAX or 8-bump WLP, and the quad MAX40078 uses 14-TSSOP. Although functional pin functions align across variants (e.g., IN+, IN–, OUT, VDD, VSS), physical pinouts differ. The MAX40077AUA+ shares pinout only with the single-channel MAX40079 and MAX40087 - but those differ in gain stability (MAX40087 requires AV ≥5) and lack shutdown in some versions.
MAX40077AUA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 2
- Output Type:
- Push-Pull, Rail-to-Rail
- Slew Rate:
- 10V/µs
- Gain Bandwidth Product:
- 10 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 0.3 pA
- Voltage - Input Offset:
- 30 µV
- Current - Supply:
- 2.2mA (x2 Channels)
- Current - Output / Channel:
- 50 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:
- 8-uMAX/uSOP
MAX40077AUA+ FAQ
1.How can I place an order for MAX40077AUA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX40077AUA+ 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 MAX40077AUA+ reliable?
The price and inventory of MAX40077AUA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX40077AUA+ is usually 5 days.
3.What payment methods are accepted for MAX40077AUA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX40077AUA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX40077AUA+?
MAX40077AUA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX40077AUA+ 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 MAX40077AUA+?
For technical support, including MAX40077AUA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX40077AUA+ requirements.
6.How does Aetrix verify that MAX40077AUA+ is sourced from the original manufacturer or authorized distributors?
All MAX40077AUA+ 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 MAX40077AUA+ meets industry standards.
7.What is the process for return or replacement of MAX40077AUA+?
All MAX40077AUA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX40077AUA+, 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 MAX40077AUA+ part is unused and in its original packaging.
Return procedure for MAX40077AUA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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