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Analog Devices Inc./Maxim Integrated MAX4477ASA-T
- Part No.:
- MAX4477ASA-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX4477ASA-T.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,143
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Product details
Overview
MAX4477ASA-T from Maxim Integrated is a dual, rail-to-rail output, low-noise, low-distortion operational amplifier optimized for precision signal conditioning in single-supply systems. It delivers 10MHz gain-bandwidth, 0.0002% THD+N at 1kHz (1kΩ load), 4.5nV/√Hz input voltage-noise density, and operates from +2.7V to +5.5V - making it ideal for high-fidelity ADC buffering and sensor front-ends in medical instrumentation.
For engineers reviewing the MAX4477ASA-T datasheet, MAX4477ASA-T pinout, MAX4477ASA-T application, or MAX4477ASA-T equivalent, this page provides verified circuit role, package mapping, thermal performance, shutdown behavior, and validated alternative options for low-noise analog signal chains requiring DC accuracy and wide dynamic range.
Technical Context
The MAX4477ASA-T is a dual-channel, unity-gain stable op amp with BiCMOS process technology, featuring ground-sensing inputs (common-mode range extends 0.2V below VSS) and true rail-to-rail outputs capable of driving 1kΩ loads while maintaining DC accuracy. Its input bias current is ≤150pA (max), enabling use with high-impedance sources like piezoelectric transducers and strain gauges.
It supports single-supply operation from +2.7V to +5.5V, exhibits excellent PSRR (≥90dB) and CMRR (≥90dB), and maintains stability with capacitive loads up to 200pF. Unlike the MAX4488/MAX4489 variants, the MAX4477ASA-T is not decompensated - it is unity-gain stable and does not include a shutdown pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 10MHz - enables stable closed-loop operation at unity gain with sufficient phase margin for precision filtering and buffering. |
| THD+N (1kHz, 2VP-P, RL=1kΩ) | 0.0002% - ensures minimal harmonic corruption in 16-bit DAC output stages and audio-grade preamplifiers. |
| Input Voltage-Noise Density | 4.5nV/√Hz at 1kHz - critical for preserving SNR in low-level sensor amplification (e.g., microphone, strain gauge). |
| Input Bias Current | ±150pA max - allows direct interfacing with high-Z sources without significant offset error or signal attenuation. |
| Rail-to-Rail Output Swing | Within 80mV of rails (1kΩ load) - maximizes dynamic range in low-voltage systems (e.g., 3.3V or 5V single-supply designs). |
| Supply Voltage Range | +2.7V to +5.5V - compatible with modern low-power microcontrollers and battery-operated instrumentation. |
| Operating Temperature | -40°C to +125°C - qualified for industrial and automotive environments per AEC-Q100 (note: /V suffix required for automotive; MAX4477ASA-T is standard grade). |
Pinout & Package
MAX4477ASA-T is housed in an 8-pin SO (Small Outline) package (package code S8+4), with exposed pad not present. Thermal resistance θJA is 132°C/W on multi-layer board, supporting reliable operation at full temperature range under typical PCB layout conditions.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUTA | Output of amplifier A - rail-to-rail swing, capable of sourcing/sinking ±5mA; connect directly to ADC input or DAC buffer node. |
| 2 | INA− | Inverting input of amplifier A - high-impedance node; requires matched trace routing and guard ring for optimal CMRR. |
| 3 | INA+ | Noninverting input of amplifier A - accepts common-mode voltages down to VSS − 0.2V; suitable for ground-referenced sensors. |
| 4 | VSS | Negative supply - connect to system ground in single-supply configuration; serves as reference for all input/output voltage ranges. |
| 5 | VDD | Positive supply - bypass with 0.1µF ceramic capacitor close to pin to suppress high-frequency noise and ensure stability. |
| 6 | INB+ | Noninverting input of amplifier B - electrically isolated from amplifier A; enables independent dual-channel signal paths. |
| 7 | INB− | Inverting input of amplifier B - identical electrical characteristics to INA−; supports differential or single-ended configurations. |
| 8 | OUTB | Output of amplifier B - fully independent of OUTA; allows simultaneous processing of two analog signals (e.g., I/Q channels, dual-sensor readout). |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low distortion | 0.0002% THD+N at 1kHz enables 16-bit DAC linearity preservation without trimming. |
| Low input voltage-noise density | 4.5nV/√Hz at 1kHz ensures <1µV RMS integrated noise over 20kHz bandwidth - critical for ECG and microphone preamps. |
| Rail-to-rail output with 1kΩ drive | Maintains DC accuracy while delivering full-scale swing in 3.3V systems - eliminates need for level-shifting or external buffers. |
| Ground-sensing input | Common-mode range includes VSS − 0.2V, allowing direct connection to grounded thermocouples or bridge sensors without level shifters. |
| Unity-gain stability | No external compensation required for gains ≥ 1V/V - simplifies design of precision integrators, active filters, and unity-gain followers. |
Applications
| ADC Buffers | DAC Output Amplifiers |
|---|---|
|
Use Scenario: Driving the input of a 16-bit SAR ADC (e.g., MAX11274) in a portable data logger. IC Role / Device Role / Timing Role: Precision voltage follower providing low-output impedance, high CMRR, and minimal THD to preserve ENOB. Use Value: Enables full 16-bit resolution by limiting input settling error to <0.5 LSB and suppressing noise-induced quantization uncertainty. |
Use Scenario: Buffering the unbuffered voltage output of a 16-bit DAC (e.g., MAX5541) in medical imaging control circuits. IC Role / Device Role / Timing Role: Low-bias-current output amplifier ensuring monotonicity and minimizing gain error across full scale. Use Value: Input bias current ≤150pA prevents DAC output droop and guarantees 16-bit accuracy without calibration. |
| Low-Noise Microphone/Preamplifiers | Strain Gauges/Sensor Amplifiers |
|
Use Scenario: First-stage amplification for electret condenser microphone in hearing aid front-end. IC Role / Device Role / Timing Role: High-input-impedance, low-noise transimpedance or noninverting amplifier with DC-coupled output. Use Value: 4.5nV/√Hz input noise and 0.0002% THD+N preserve speech intelligibility and dynamic range above 100dB SPL. |
Use Scenario: Instrumentation amplifier front-end for quarter-bridge strain gauge in industrial load cell. IC Role / Device Role / Timing Role: Dual-channel difference amplifier with matched gain and offset tracking across temperature. Use Value: Dual architecture enables ratiometric measurement; 70µV max VOS and ±0.3µV/°C tempco minimize zero-drift errors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise, dual, rail-to-rail op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2188AIDR | Lower input voltage noise (3.2nV/√Hz), higher GBW (2MHz), zero-drift architecture; no shutdown; SO-8 package. | Better long-term drift stability and lower 1/f noise - preferred for DC-critical weigh scales and precision thermocouple amps. | Select when ultra-low VOS drift (<0.003µV/°C) and near-zero 1/f noise outweigh need for 10MHz bandwidth. |
| ADA4625-2ARMZ | Higher GBW (34MHz), lower THD+N (0.00008%), 2.8nV/√Hz noise; SO-8; specified for ±15V dual supply but functional at +5V single supply. | Superior slew rate (19V/µs) and full-power bandwidth - better suited for fast-settling multiplexed sensor arrays or ultrasound receive paths. | Select when >10MHz small-signal bandwidth and sub-100ns settling to 0.01% are required alongside low noise. |
Compared with OPA2188AIDR and ADA4625-2ARMZ, the MAX4477ASA-T offers the best balance of 10MHz bandwidth, 0.0002% THD+N, and proven rail-to-rail operation at +2.7V - making it optimal for cost-sensitive, battery-powered instrumentation where moderate speed and ultra-low distortion are prioritized over zero-drift or extreme slew rate.
Availability
MAX4477ASA-T is available at Aetrix Electronics and suitable for medical instrumentation, industrial sensor interfaces, and portable test equipment requiring stable component supply, extended temperature support, and RoHS-compliant packaging.
Supply support for MAX4477ASA-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 high-performance analog and mixed-signal ICs for precision, power, and interface applications across industrial, medical, and communications markets.
The MAX4475–MAX4478 family was engineered specifically for low-noise, low-distortion signal conditioning in single-supply systems - targeting high-resolution data acquisition, sensor front-ends, and audio-grade amplification where rail-to-rail swing and DC accuracy are essential.
FAQ
What is the gain-bandwidth product of the MAX4477ASA-T?
The MAX4477ASA-T has a gain-bandwidth product of 10MHz, confirmed in the AC Electrical Characteristics table under "Gain-Bandwidth Product" for MAX4475–MAX4478 devices. This value applies across the full operating temperature range (-40°C to +125°C) and supports stable unity-gain operation without external compensation. The MAX4477ASA-T is not decompensated - unlike the MAX4488/MAX4489 series, it does not require minimum gain for stability.
Does the MAX4477ASA-T include a shutdown pin?
No, the MAX4477ASA-T does not include a shutdown pin. Shutdown functionality is only available on the single-amplifier variants MAX4475 and MAX4488 (pin 5 in SOT23/TDFN packages). The MAX4477ASA-T is a dual op amp in SO-8 package with pins 1–8 assigned exclusively to OUTA, INA−, INA+, VSS, VDD, INB+, INB−, and OUTB - no SHDN or NC functions are implemented.
What is the maximum capacitive load the MAX4477ASA-T can drive stably?
The MAX4477ASA-T is stable driving capacitive loads up to 200pF, as stated in the AC Electrical Characteristics table under "Capacitive-Load Stability". This specification holds for unity-gain configurations with proper PCB layout (short traces, local bypassing). For loads >200pF, isolation resistors or feedback network adjustments may be required to maintain phase margin.
Is the MAX4477ASA-T AEC-Q100 qualified?
The MAX4477ASA-T is not AEC-Q100 qualified. Automotive qualification is indicated by the "/V" suffix (e.g., MAX4477ASA/V+T). Per the Selector Guide, only /V-suffixed parts undergo automotive stress testing. The MAX4477ASA-T is rated for -40°C to +125°C operation and meets industrial reliability standards, but lacks formal AEC-Q100 certification.
What is the input common-mode voltage range for the MAX4477ASA-T?
The input common-mode voltage range for the MAX4477ASA-T is guaranteed from (VSS − 0.2V) to (VDD − 1.6V) at +25°C, and from (VSS − 0.1V) to (VDD − 1.7V) over −40°C to +125°C. This ground-sensing capability allows direct interfacing with sensors referenced to system ground - such as bridge circuits or thermistors - without level-shifting circuitry.
MAX4477ASA-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:
- Push-Pull, Rail-to-Rail
- Slew Rate:
- 3V/µs
- Gain Bandwidth Product:
- 10 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 1 pA
- Voltage - Input Offset:
- 70 µV
- Current - Supply:
- 2.5mA (x2 Channels)
- Current - Output / Channel:
- 48 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-SOIC
MAX4477ASA-T FAQ
1.How can I place an order for MAX4477ASA-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4477ASA-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 MAX4477ASA-T reliable?
The price and inventory of MAX4477ASA-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4477ASA-T is usually 5 days.
3.What payment methods are accepted for MAX4477ASA-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4477ASA-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4477ASA-T?
MAX4477ASA-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4477ASA-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 MAX4477ASA-T?
For technical support, including MAX4477ASA-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4477ASA-T requirements.
6.How does Aetrix verify that MAX4477ASA-T is sourced from the original manufacturer or authorized distributors?
All MAX4477ASA-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 MAX4477ASA-T meets industry standards.
7.What is the process for return or replacement of MAX4477ASA-T?
All MAX4477ASA-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4477ASA-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 MAX4477ASA-T part is unused and in its original packaging.
Return procedure for MAX4477ASA-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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