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Analog Devices Inc./Maxim Integrated MAX4081FASA-T
- Part No.:
- MAX4081FASA-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX4081FASA-T.pdf
- Description:
- IC CURRENT SENSE 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,497
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Product details
Overview
The MAX4081FASA-T from Maxim Integrated is a bidirectional, high-side current-sense amplifier with 5V/V gain, 4.5V–76V common-mode input range, ±500mV full-scale sense voltage, and ±0.1% gain accuracy at +25°C - designed for precision battery charge/discharge monitoring in automotive and telecom power systems.
For engineers reviewing the MAX4081FASA-T datasheet, MAX4081FASA-T pinout, MAX4081FASA-T application, or MAX4081FASA-T equivalent, this device delivers verified bidirectional sensing capability, external reference-controlled zero-current output level, and automotive-grade (-40°C to +125°C) operation in an 8-pin SO package.
Technical Context
The MAX4081FASA-T implements a high-impedance differential input stage with internal current mirroring and output level-shifting referenced to externally applied VREF (via REF1A/REF1B), enabling true bidirectional output swing from VREF to GND (discharge) and VREF to VCC (charge). Its architecture avoids polarity-detection circuitry while maintaining monotonic output response across zero-crossing.
It operates independently of supply voltage: VCC (4.5V–76V) and VRS+ (4.5V–76V) ranges are decoupled, allowing high-side sensing even when monitored bus voltage exceeds VCC. Input offset voltage remains ≤±0.6mV over full temperature range, and CMRR exceeds 100dB across 10Hz–100kHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 5V/V - sets full-scale output span to ±2.5V when VREF = 2.5V and RSENSE yields ±500mV VSENSE |
| Common-Mode Input Range | 4.5V to 76V - enables direct high-side sensing on 12V/24V/48V/72V buses without level-shifting |
| Full-Scale Sense Voltage | ±500mV - supports accurate low-loss current measurement down to 50mA with 10mΩ shunt |
| Gain Accuracy | ±0.1% (typ), ±1.2% (max over -40°C to +125°C) - ensures <±6mV error in 5V output span for battery SOC estimation |
| Supply Current | 103µA (typ) - enables always-on current monitoring in low-power automotive ECU modules |
| Bandwidth | 150kHz - sufficient for PWM motor control loop feedback and fast battery protection response |
| Input Offset Voltage | ±0.1mV (typ), ±1.2mV (max) - minimizes zero-current drift in precision energy metering applications |
Pinout & Package
MAX4081FASA-T is housed in an 8-pin SO (Small Outline) package, RoHS-compliant, with exposed pad not electrically connected. Pin 1 is RS+, pin 2 is VCC, pin 3/6/7 are no-connect (NC), pin 4 is GND, pin 5 is OUT, pin 8 is RS-, and pins REF1A (7) and REF1B (6) are dedicated reference inputs per MAX4081 functional diagram.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (RS+) | High-side sense resistor terminal | Connects to positive side of shunt; withstands up to +80V absolute max relative to GND |
| 2 (VCC) | Supply voltage input | Independent 4.5V–76V rail; bypass with ≥0.1µF ceramic capacitor to GND |
| 3, 6, 7 (N.C.) | No internal connection | May be left open or tied to GND; no electrical function or thermal benefit |
| 4 (GND) | Analog ground reference | Return path for internal amplifiers and reference circuitry; separate from power ground recommended |
| 5 (OUT) | Voltage output | Bidirectional output referenced to VREF; swings from VREF to GND (discharge) or VREF to VCC (charge) |
| 6 (REF1B) | Reference input B | Paired with REF1A to define VREF = (REF1A + REF1B)/2; connect to REF1A or GND per configuration |
| 7 (REF1A) | Reference input A | Primary reference node; sets zero-current output level; requires low-noise, stable voltage source |
| 8 (RS-) | Low-side sense resistor terminal | Connects to load side of shunt; common-mode voltage tracks RS+ within ±80V differential limit |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional sensing with single output | Eliminates need for dual-output comparators or polarity-detection logic in battery management systems |
| User-configurable zero-current reference | VREF set via external REF1A/REF1B allows flexible ADC input alignment (e.g., centered at 2.5V for 5V SAR ADC) |
| 76V independent common-mode and supply range | Enables direct monitoring of 48V telecom backplanes or 72V EV auxiliary supplies without auxiliary bias rails |
| ±0.1% gain accuracy at +25°C | Supports Class 0.1 current measurement compliance in industrial energy metering and UPS monitoring |
| 150kHz bandwidth with 20µs settling | Meets real-time response requirements for motor phase current feedback in BLDC controllers |
Applications
| Automotive Battery Management | 48V Telecom Backplane Monitoring |
|---|---|
|
Use Scenario: Real-time tracking of Li-ion battery pack charge/discharge cycles in start-stop and mild-hybrid vehicles. IC Role / Device Role / Timing Role: High-side bidirectional current sensor feeding analog input of battery monitor IC (e.g., MAX17852). Use Value: Enables accurate state-of-charge (SOC) and state-of-health (SOH) calculation with <±0.5% current integration error over lifetime. |
Use Scenario: Continuous current monitoring of 48V DC distribution bus in telecom central office equipment. IC Role / Device Role / Timing Role: High-voltage, high-common-mode current amplifier interfacing to isolated ADC via digital isolator. Use Value: Provides fault detection resolution down to 100mA with immunity to bus transients up to ±100V. |
| Bidirectional Motor Control Feedback | Precision High-Voltage Current Source |
|
Use Scenario: Closed-loop current regulation in H-bridge-driven industrial actuators requiring regenerative braking feedback. IC Role / Device Role / Timing Role: Bidirectional sense amplifier delivering real-time ILOAD signal to PWM controller's current-limit comparator. Use Value: Delivers 20µs response to current reversals, enabling sub-100µs overcurrent shutdown during brake-to-drive transitions. |
Use Scenario: Stable current sourcing for avalanche photodiode (APD) bias in fiber-optic receiver modules. IC Role / Device Role / Timing Role: High-accuracy, low-drift current mirror driver with programmable full-scale via external RSENSE. Use Value: Maintains <±0.2% current stability over -40°C to +85°C, critical for APD gain control in optical transceivers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional high-side current sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A1QDRQ1 | 20V/V fixed gain, integrated 100mV zero-drift amplifier, 80V common-mode, 1.1MHz bandwidth | Higher bandwidth but narrower full-scale sense range (±80mV); requires external gain stage for ±500mV use cases | Select when >1MHz transient response is required and system can accommodate lower VSENSE headroom |
| ACS724LLCTR-10AU-T | Galvanically isolated Hall-effect sensor, 10A range, 1.2mV/mA sensitivity, 3.3V output, 120kHz bandwidth | No external reference needed; outputs absolute voltage (not ratiometric to VREF); limited to 10A full-scale | Select when isolation is mandatory and unidirectional or low-precision bidirectional sensing suffices |
Compared with INA240A1QDRQ1 and ACS724LLCTR-10AU-T, the MAX4081FASA-T offers uniquely configurable reference alignment, wider ±500mV sense range at 5V/V gain, and proven automotive qualification - making it optimal for precision battery telemetry where VREF-based ADC interfacing and wide dynamic current range are essential.
Availability
MAX4081FASA-T is available at Aetrix Electronics and suitable for automotive battery management, 48V telecom power distribution, bidirectional motor control, precision high-voltage current sources, and board-level system current sensing requiring stable component supply across extended temperature and voltage ranges.
Supply support for MAX4081FASA-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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for demanding industrial, automotive, and communications applications.
The MAX4080/MAX4081 family was engineered specifically for high-voltage, high-accuracy bidirectional current sensing in safety-critical power systems - emphasizing rail-to-rail common-mode tolerance, low offset drift, and reference-flexible output architecture.
FAQ
What is the maximum common-mode voltage the MAX4081FASA-T can withstand?
The MAX4081FASA-T supports a guaranteed common-mode input range of 4.5V to 76V, with absolute maximum ratings allowing RS+ and RS- to tolerate voltages from -0.3V to +80V relative to GND. This enables reliable operation on 48V telecom buses and 72V industrial supplies without external attenuation or level-shifting circuitry. The MAX4081FASA-T maintains specified performance across its entire 76V range.
How do I configure the reference voltage for bidirectional operation of the MAX4081FASA-T?
For bidirectional operation, connect both REF1A and REF1B pins of the MAX4081FASA-T to a stable, low-noise voltage source (e.g., 2.5V or 3.3V); VREF is then the average of these two inputs. Alternatively, tie REF1B to GND and apply VREF1A = 2× desired VREF (e.g., 5V for 2.5V VREF). The MAX4081FASA-T output centers at VREF when VSENSE = 0V, swinging above VREF for charge and below for discharge.
Does the MAX4081FASA-T require external components for basic operation?
Yes - the MAX4081FASA-T requires an external current-sense resistor (RSENSE), a bypass capacitor (≥0.1µF ceramic from VCC to GND), and a stable reference voltage source for REF1A/REF1B. No external gain-setting resistors are needed, as gain is fixed at 5V/V by internal laser-trimmed resistors. The MAX4081FASA-T integrates all active circuitry; only passive interface components are required.
What is the temperature range specification for the MAX4081FASA-T?
The MAX4081FASA-T is fully specified over the automotive temperature range of -40°C to +125°C. All key parameters - including gain accuracy (±1.2% max), input offset voltage (±1.2mV max), and supply current (103–190µA) - are guaranteed across this range. The device uses Maxim's bipolar process and undergoes 100% production testing at +25°C with design validation across extremes.
Can the MAX4081FASA-T be used in unidirectional applications?
Yes - the MAX4081FASA-T functions correctly in unidirectional applications by grounding REF1B and applying a fixed VREF1A (e.g., 2.5V), resulting in VREF = 1.25V. Output then swings from 1.25V to VCC for forward current and remains at 1.25V for zero/negative current. However, the MAX4080FASA-T (unidirectional variant) offers identical gain and accuracy with simpler 5-pin interface and lower cost for dedicated unidirectional use.
MAX4081FASA-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:
- Current Sense
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- -
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 150 kHz
- Current - Input Bias:
- 5 µA
- Voltage - Input Offset:
- 100 µV
- Current - Supply:
- 103µA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 4.5 V
- Voltage - Supply Span (Max):
- 76 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX4081FASA-T FAQ
1.How can I place an order for MAX4081FASA-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4081FASA-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 MAX4081FASA-T reliable?
The price and inventory of MAX4081FASA-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4081FASA-T is usually 5 days.
3.What payment methods are accepted for MAX4081FASA-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4081FASA-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4081FASA-T?
MAX4081FASA-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4081FASA-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 MAX4081FASA-T?
For technical support, including MAX4081FASA-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4081FASA-T requirements.
6.How does Aetrix verify that MAX4081FASA-T is sourced from the original manufacturer or authorized distributors?
All MAX4081FASA-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 MAX4081FASA-T meets industry standards.
7.What is the process for return or replacement of MAX4081FASA-T?
All MAX4081FASA-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4081FASA-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 MAX4081FASA-T part is unused and in its original packaging.
Return procedure for MAX4081FASA-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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