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Analog Devices Inc./Maxim Integrated MAX40078AUD+
- Part No.:
- MAX40078AUD+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
MAX40078AUD+.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:233
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Product details
Overview
MAX40078AUD+ from Analog Devices is a quad-channel, unity-gain stable, ultra-low-input-bias-current operational amplifier optimized for high-impedance sensor interfacing and precision signal conditioning. It delivers 4.2nV/√Hz input voltage noise density at 30kHz, 0.3pA (typ) input bias current, and 10MHz gain-bandwidth product - enabling high-fidelity transimpedance amplification in pH probes, strain gauges, and medical instrumentation.
For engineers reviewing the MAX40078AUD+ datasheet, MAX40078AUD+ pinout, MAX40078AUD+ application, or MAX40078AUD+ equivalent, this page provides verified electrical specifications, package mapping to the 14-pin TSSOP (U14M+1), confirmed rail-to-rail output swing with 1kΩ load, and validated alternatives for low-noise, wide-temperature-range op amp selection.
Technical Context
The MAX40078AUD+ belongs to the MAX4007x/MAX4008x family of single/dual/quad ultra-low-noise, low-input-bias-current op amps. It is unity-gain stable with a 10MHz GBWP, 3V/µs slew rate, and operates across –40°C to +125°C. Its input common-mode range extends to ground (–0.1V min), and its push-pull output stage drives ±20mA while maintaining DC accuracy.
Designed for high-impedance source buffering, it features 1000GΩ input resistance, 7pF input capacitance, and integrated 60Ω series input protection resistors with back-to-back ESD diodes. It is not suitable for open-loop comparator use due to internal differential protection circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth Product | 10MHz - supports stable unity-gain configurations up to 10MHz signal bandwidth without oscillation. |
| Input Bias Current | 0.3pA (typ) - enables accurate amplification of picoamp-level currents from photodiodes or reference electrodes. |
| Input Voltage Noise Density | 4.2nV/√Hz at 30kHz - ensures minimal added noise in audio, medical, and precision ADC buffer applications. |
| Rail-to-Rail Output Swing | Within 80mV of rails into 1kΩ - maintains full dynamic range in 2.7V–5.5V single-supply systems. |
| Input Common-Mode Range | –0.1V to VDD – 1.5V - supports true ground-sensing and low-side current measurement without phase reversal. |
| Total Harmonic Distortion + Noise | –114dB (1kHz, 4VPP, RL = 10kΩ) - preserves signal integrity in 16-bit ADC front-ends and DAC output stages. |
| Quiescent Supply Current | 2.5mA per amplifier (max at 125°C) - balances low-noise performance with power efficiency in multi-channel designs. |
Pinout & Package
MAX40078AUD+ is packaged in a 14-pin TSSOP (package code U14M+1, outline 21-0066), measuring 5.0mm × 4.4mm × 1.2mm with 0.65mm pitch. Thermal resistance θJA is 100.4°C/W on a four-layer board.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUTD | Output of Channel D - rail-to-rail capable, drives loads ≥1kΩ with <80mV headroom to supply rails. |
| 2 | IND– | Inverting input of Channel D - protected by 60Ω series resistor and ESD diodes; not for open-loop comparator use. |
| 3 | IND+ | Non-inverting input of Channel D - supports common-mode input down to –0.1V (ground-referenced sensing). |
| 4 | VSS | Negative supply pin - connect to 0V in single-supply operation; forms return path for all four channels. |
| 5 | VDD | Positive supply pin - accepts 2.7V to 5.5V; powers all internal circuitry and output stages. |
| 6 | INA+ | Non-inverting input of Channel A - identical electrical characteristics to Pins 3, 9, and 12; high-impedance node (1000GΩ). |
| 7 | INA– | Inverting input of Channel A - matched to Pin 2 and Pin 9; used in TIA feedback networks with low leakage. |
| 8 | OUTA | Output of Channel A - electrically identical to Pins 1, 8, and 14; shares same drive capability and settling behavior. |
| 9 | INB– | Inverting input of Channel B - supports dual-channel TIA or differential sensor buffering with matched layout. |
| 10 | INB+ | Non-inverting input of Channel B - enables independent biasing of each channel's input common-mode point. |
| 11 | OUTB | Output of Channel B - synchronized settling (2µs to 0.01%) with other channels under identical load conditions. |
| 12 | INC+ | Non-inverting input of Channel C - allows four independent high-Z sensor interfaces on one IC. |
| 13 | INC– | Inverting input of Channel C - supports individual feedback networks per channel without crosstalk degradation. |
| 14 | OUTC | Output of Channel C - completes quad-channel output set; no shutdown control (unlike MAX40079/MAX40087). |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low input bias current | 0.3pA typical - minimizes voltage error across high-value feedback resistors (>1GΩ) in transimpedance amplifiers. |
| Low 1/f noise | 1.7µVPP (0.1Hz–10Hz) - critical for DC-stable pH probe and reference electrode signal chains. |
| Rail-to-rail output with 1kΩ load | Swings within 80mV of VDD/VSS - maximizes usable dynamic range in low-voltage (3.3V) data acquisition systems. |
| Guaranteed operation to +125°C | Specified over –40°C to +125°C - qualified for automotive cabin sensors, industrial motor controllers, and medical thermal modules. |
| Input protection architecture | 60Ω series resistors + back-to-back ESD diodes - prevents latch-up during transient overvoltage events up to ±6V (10s). |
Applications
| Transimpedance Amplifier (TIA) | pH Probe Signal Conditioning |
|---|---|
Use Scenario: Converting photocurrent from a silicon photodiode (10pA–100nA) into a precise voltage output for optical sensing. IC Role / Device Role / Timing Role: Quad-channel TIA core - each channel independently buffers and converts current from discrete photodiode elements. Use Value: 0.3pA input bias current prevents offset drift; 4.2nV/√Hz noise preserves SNR in low-light detection; rail-to-rail output enables full-scale use of 12-bit ADC input range. |
Use Scenario: Amplifying mV-level output from glass pH electrode while rejecting leakage currents induced by high-impedance electrolyte interface. IC Role / Device Role / Timing Role: Unity-gain buffer between pH probe and ADC - isolates high-Z electrode from PCB trace capacitance and digital noise. Use Value: 1000GΩ input resistance eliminates loading error; –0.1V input common-mode range allows direct ground-referenced electrode connection; low THD+N avoids harmonic distortion in calibration curves. |
| Strain Gauge Instrumentation | Medical ECG Front-End |
Use Scenario: Reading Wheatstone bridge output from bonded foil strain gauges in structural health monitoring systems. IC Role / Device Role / Timing Role: Precision differential amplifier stage - two channels configured as INA+, INA– for bridge excitation and output buffering. Use Value: 30µV max input offset voltage minimizes zero-error; CMRR >87dB suppresses common-mode bridge excitation noise; 10MHz GBWP supports fast step-response in dynamic load testing. |
Use Scenario: Buffering microvolt-level biopotential signals from Ag/AgCl electrodes in portable ECG monitors. IC Role / Device Role / Timing Role: First-stage amplifier in analog front-end - four channels support simultaneous lead I, II, III, and aVR acquisition. Use Value: Ultra-low 0.5fA/√Hz current noise prevents electrode interface current errors; 120dB PSRR rejects AC mains interference; –40°C to +125°C rating covers sterilization temperature cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultra-low-input-bias-current, low-noise operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADA4530-1ARZ | Lower input bias current (20fA typ), higher GBWP (2MHz), but only single-channel; requires external guard ring for optimal leakage control. | Better suited for femtoamp-level electrometer applications; less space-efficient for multi-channel designs. | Select when absolute lowest input bias current is required and board area permits discrete guarding; avoid if quad-channel integration is mandatory. |
| OPA192IDR | Higher input bias current (1pA typ), lower noise (5.5nV/√Hz), wider supply range (±2.25V to ±18V); no guaranteed operation above +105°C. | Preferred for industrial PLC analog I/O where extended temperature is not required and bipolar supplies are available. | Choose for cost-sensitive, non-automotive industrial systems needing robustness against EMI; not recommended for medical or automotive AEC-Q100 contexts. |
Compared with ADA4530-1ARZ and OPA192IDR, the MAX40078AUD+ uniquely combines quad-channel integration, guaranteed +125°C operation, and sub-picoamp input bias in a standard TSSOP package - making it the only option for space-constrained, high-reliability, multi-sensor front-ends requiring simultaneous low-leakage amplification.
Availability
MAX40078AUD+ is available at Aetrix Electronics and suitable for transimpedance amplifier designs, medical instrumentation signal chains, and industrial strain gauge readouts requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX40078AUD+ 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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The MAX4007x/MAX4008x family was designed specifically for ultra-high-impedance sensor signal conditioning - targeting applications where leakage current, 1/f noise, and input common-mode range below ground are primary design constraints.
FAQ
What is the maximum capacitive load the MAX40078AUD+ can drive stably?
The MAX40078AUD+ drives capacitive loads up to 200pF without oscillation when configured in unity-gain stable mode. Stability is verified per datasheet Figure 23 (stability vs. capacitive/resistive load), and the device remains stable with 100pF loads even under heavy resistive loading (1kΩ). For loads >100pF, adding a small series resistor (10–50Ω) at the output improves phase margin without degrading DC accuracy.
Does the MAX40078AUD+ include a shutdown pin?
No, the MAX40078AUD+ does not include a shutdown pin. Shutdown functionality is only available on the single-channel MAX40079 and MAX40087 variants (Pins 5 in SOT23-6 and 6-WLP packages). The MAX40078AUD+ is a quad-channel device with fixed operation - all four amplifiers remain active whenever VDD and VSS are powered within specification.
Can the MAX40078AUD+ be used in a photovoltaic-mode TIA configuration?
Yes, the MAX40078AUD+ is explicitly recommended for photovoltaic-mode TIAs in the datasheet (Figure 6). Its 0.3pA input bias current prevents dark current corruption, and its rail-to-rail output accommodates low-voltage photodiode bias points (100–200mV). The 7pF input capacitance must be considered alongside photodiode junction capacitance (CJ) to ensure stability - compensation techniques like feed-forward capacitor CZ are detailed in the Applications Information section.
What is the input voltage range relative to supply rails for the MAX40078AUD+?
The MAX40078AUD+ input common-mode voltage range is specified from –0.1V to VDD – 1.5V over the full –40°C to +125°C temperature range. This allows true ground-referenced inputs (e.g., low-side current sensing) and guarantees no phase reversal when inputs are overdriven within this range. Absolute maximum differential input voltage is ±3V continuous, ±6V transient (10s).
How does the MAX40078AUD+ compare to the MAX40077 in terms of package and pin compatibility?
The MAX40078AUD+ (14-TSSOP, U14M+1) and MAX40077 (8-WLP or µMAX-8) are functionally identical quad-channel amplifiers but differ in package and pinout. They are not pin-compatible: MAX40077 uses an 8-pin footprint for dual-channel operation, while MAX40078AUD+ uses 14 pins for quad-channel. Layout redesign is required when substituting - however, electrical specs (GBWP, noise, bias current) match exactly across the family.
MAX40078AUD+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 4
- 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 (x4 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:
- 14-TSSOP
MAX40078AUD+ FAQ
1.How can I place an order for MAX40078AUD+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX40078AUD+ 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 MAX40078AUD+ reliable?
The price and inventory of MAX40078AUD+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX40078AUD+ is usually 5 days.
3.What payment methods are accepted for MAX40078AUD+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX40078AUD+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX40078AUD+?
MAX40078AUD+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX40078AUD+ 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 MAX40078AUD+?
For technical support, including MAX40078AUD+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX40078AUD+ requirements.
6.How does Aetrix verify that MAX40078AUD+ is sourced from the original manufacturer or authorized distributors?
All MAX40078AUD+ 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 MAX40078AUD+ meets industry standards.
7.What is the process for return or replacement of MAX40078AUD+?
All MAX40078AUD+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX40078AUD+, 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 MAX40078AUD+ part is unused and in its original packaging.
Return procedure for MAX40078AUD+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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