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Analog Devices Inc./Maxim Integrated MAX4081SASA+T
- Part No.:
- MAX4081SASA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX4081SASA+T.pdf
- Description:
- IC CURRENT SENSE 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:799
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Product details
Overview
The MAX4081SASA+T from Maxim Integrated is a bidirectional, high-side current-sense amplifier with 60V/V gain, 76V common-mode input range (4.5V to 76V), ±100mV full-scale sense voltage, and operation over –40°C to +125°C. It enables precise battery charge/discharge monitoring in automotive and telecom systems using an external reference to set zero-current output at VREF.
For engineers reviewing the MAX4081SASA+T datasheet, MAX4081SASA+T pinout, MAX4081SASA+T application, or MAX4081SASA+T equivalent, key selection factors include its bidirectional sensing capability, 60V/V fixed gain, SO-8 package compatibility, and requirement for external REF1A/REF1B biasing to define output polarity and zero-current level.
Technical Context
The MAX4081SASA+T implements a precision current mirror-based architecture that maintains constant input terminal voltages during bidirectional sensing, enabling accurate measurement of both charge (RS+ > RS−) and discharge (RS+ < RS−) currents. Its output swings above or below VREF proportionally to VSENSE, with VOUT = VREF when VSENSE = 0V.
Unlike unidirectional variants, the MAX4081SASA+T requires dual reference inputs (REF1A and REF1B) to establish VREF = (REF1A + REF1B)/2 - supporting flexible reference configurations including REF1B grounded and REF1A biased to set VREF = REF1A/2. This allows system-level optimization of dynamic headroom between VREF–GND and VCC–VREF.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 60V/V - sets full-scale output swing for ±50mV sense voltage; enables high-resolution low-current sensing with minimal IR loss. |
| Common-Mode Input Range | 4.5V to 76V - supports direct high-side monitoring of 12V/24V/48V batteries and backplane rails without level-shifting. |
| Full-Scale Sense Voltage | ±50mV - defines maximum measurable bidirectional current before output clipping; determines RSENSE selection for target ILOAD. |
| Input Offset Voltage | ±0.1mV (typ) at +25°C - contributes ≤0.2% error at full scale; critical for accuracy in low-current battery monitoring. |
| Supply Current | 103µA (typ) - enables always-on current monitoring in power-constrained automotive and portable systems. |
| Bandwidth | 150kHz - supports real-time response to fast load transients in motor control and power management loops. |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive and industrial environments with no derating required. |
Pinout & Package
MAX4081SASA+T is housed in an 8-pin SO (Small Outline) package, RoHS-compliant and rated for automotive temperature range (–40°C to +125°C). The package footprint matches standard SOIC-8 land patterns (Maxim land pattern no. 90-0096).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RS+ | High-side sense input | Connects to positive terminal of external sense resistor; withstands up to 76V common-mode voltage independent of VCC. |
| 2 VCC | Supply voltage input | 4.5V–76V single supply; decoupled with ≥0.1µF capacitor; electrically isolated from sensed rail. |
| 3,6,7 N.C. | No internal connection | Leads may be left open or tied to GND; no functional impact on performance or thermal behavior. |
| 4 GND | Analog ground reference | Return path for internal circuitry and output stage; must be connected to system ground with low-impedance trace. |
| 5 OUT | Voltage output | Output swings from VREF to VCC (charge) or VREF to GND (discharge); referenced to externally set VREF. |
| 8 RS− | Load-side sense input | Connects to negative terminal of external sense resistor; completes high-side current path without ground interference. |
| - REF1A | Reference input A | Defines upper reference node; used with REF1B to generate VREF = (REF1A + REF1B)/2; accepts 1.5V–6V. |
| - REF1B | Reference input B | Defines lower reference node; may be tied to REF1A or GND; determines VREF scaling and output symmetry. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional sensing | Single-output architecture eliminates need for separate polarity detection; simplifies ADC interface and firmware logic. |
| 60V/V fixed gain | Optimized for ±50mV full-scale sense voltage - enables use of low-value, low-power, low-inductance sense resistors (e.g., 10mΩ) in high-current applications. |
| 76V independent common-mode range | Allows RS+ and VCC to operate at different potentials - supports monitoring of battery stacks or isolated DC rails without auxiliary supplies. |
| External reference flexibility | REF1A/REF1B configuration supports either ratiometric (VREF = REF1A/2) or absolute (VREF = fixed voltage) referencing - adapts to system-level voltage domain constraints. |
| ±0.1% full-scale gain accuracy | Guaranteed over –40°C to +125°C - ensures consistent current measurement across automotive thermal cycles without calibration. |
Applications
| Automotive Battery Management | 48V Telecom Backplane Monitoring |
|---|---|
|
Use Scenario: Real-time tracking of charge/discharge current in 12V/48V vehicle battery systems with integrated smart-charger control. IC Role / Device Role / Timing Role: High-side current sensor providing bidirectional analog output referenced to microcontroller ADC's internal VREF. Use Value: Enables SOC estimation and thermal protection with ±0.2% total error budget, leveraging ±50mV full-scale range and 60V/V gain to resolve sub-amp currents. |
Use Scenario: Continuous current monitoring of distributed power feeds in carrier-grade telecom shelves with hot-swap capability. IC Role / Device Role / Timing Role: High-voltage current monitor interfaced to isolated sigma-delta ADC for digital power telemetry. Use Value: 76V common-mode range permits direct connection to 48V bus without attenuators; 150kHz bandwidth captures transient fault events for OCP response. |
| Bidirectional Motor Control | Smart Power Supply Current Sensing |
|
Use Scenario: Closed-loop torque and regenerative braking current feedback in BLDC motor drives for EV auxiliary systems. IC Role / Device Role / Timing Role: Bidirectional analog current sensor feeding analog comparator and MCU ADC simultaneously for fast overcurrent shutdown and precision control. Use Value: Single OUT pin with VREF-referenced swing reduces PCB routing complexity; 103µA quiescent current minimizes standby losses in always-on controllers. |
Use Scenario: Precision output current measurement in programmable lab power supplies requiring ±0.1% line/load regulation verification. IC Role / Device Role / Timing Role: High-accuracy, high-common-mode current amplifier driving precision DAC-based feedback loop. Use Value: ±0.1mV input offset and ±0.1% gain accuracy ensure <100ppm measurement uncertainty across 0–10A range with 10mΩ shunt. |
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 | 500kHz bandwidth, 20V/V gain only, integrated 100mV zero-drift offset; no external reference inputs. | Fixed-gain, no VREF configuration flexibility; better for high-speed PWM current sampling but less adaptable to varying dynamic range needs. | Select when higher bandwidth and lower offset drift outweigh need for adjustable gain and reference topology. |
| MAX40016ATA+T | 100V common-mode range, 100V/V gain, ±10mV full-scale sense voltage; requires external VREF but uses single REF pin. | Narrower full-scale sense range demands ultra-low RSENSE values; optimized for ultra-high-precision, low-current applications. | Select when monitoring sub-100mA currents with 10mΩ shunts and >100V rail compatibility is mandatory. |
Compared with INA240A1QDRQ1 and MAX40016ATA+T, the MAX4081SASA+T offers unique trade-offs: mid-bandwidth (150kHz) with configurable reference architecture and 60V/V gain optimized for ±50mV sensing - making it ideal for automotive battery monitoring where dynamic range adaptability and temperature stability are prioritized over raw speed or ultra-low offset.
Availability
MAX4081SASA+T is available at Aetrix Electronics and suitable for automotive battery management, 48V telecom power distribution, bidirectional motor control, and smart power supply current sensing requiring stable component supply across extended temperature and high-voltage operating conditions.
Supply support for MAX4081SASA+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 precision analog and mixed-signal 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 wide common-mode range, low offset, and robust thermal performance over automotive temperature extremes.
FAQ
What is the function of REF1A and REF1B pins on the MAX4081SASA+T?
The REF1A and REF1B pins on the MAX4081SASA+T define the output reference voltage VREF = (REF1A + REF1B)/2. When REF1B is grounded, VREF equals half of REF1A - enabling flexible biasing from a single supply. This reference sets the zero-current output level (VOUT = VREF when VSENSE = 0V) and determines the symmetric swing range for bidirectional current sensing. Proper decoupling and low-noise sourcing of these pins are essential for maintaining measurement accuracy in the MAX4081SASA+T.
Can the MAX4081SASA+T operate with VCC lower than the common-mode voltage at RS+?
Yes, the MAX4081SASA+T supports independent VCC and common-mode voltage domains: VCC can be as low as 4.5V while RS+ operates up to 76V. This allows the MAX4081SASA+T to monitor high-voltage battery rails using a lower-voltage local supply - eliminating the need for isolated DC-DC converters or level shifters. The internal architecture ensures accurate sensing regardless of the voltage difference between VCC and RS+, a key enabler for compact, efficient high-side current monitoring in the MAX4081SASA+T.
What is the maximum full-scale current measurable with the MAX4081SASA+T using a 10mΩ sense resistor?
With a 10mΩ sense resistor and the MAX4081SASA+T's ±50mV full-scale sense voltage, the maximum measurable bidirectional current is ±5A (I = VSENSE / RSENSE = 50mV / 10mΩ). This delivers a full-scale output swing of VREF ± 3.0V (since VOUT = VREF ± VSENSE × 60 = VREF ± 3.0V), assuming VREF is properly biased within the VCC–GND range. The MAX4081SASA+T maintains ±0.1% gain accuracy across this range, supporting precision energy accounting in battery and power supply applications.
How does the MAX4081SASA+T handle overvoltage or saturation conditions?
The MAX4081SASA+T features inherent saturation recovery with 50µs settling time and no phase reversal when overdriven - ensuring reliable operation during fault transients. Its output is internally clamped to not exceed 18V, and the device tolerates differential input voltages up to ±80V. These characteristics prevent latch-up or damage during load dumps or short circuits, making the MAX4081SASA+T robust in automotive and industrial environments where voltage spikes are common.
Is the MAX4081SASA+T pin-compatible with other members of the MAX4080/MAX4081 family?
Yes, all MAX4080/MAX4081 variants in the same package (e.g., SO-8) share identical pinouts, including MAX4081SASA+T, MAX4081TASA+, and MAX4081FASA+. This allows drop-in replacement across gain versions (5V/V, 20V/V, 60V/V) and directionality (unidirectional MAX4080 vs. bidirectional MAX4081) without PCB redesign. However, note that MAX4080 devices lack REF1A/REF1B pins (pins 6 and 7 are N.C.), so using a MAX4080 in place of MAX4081SASA+T requires external circuit changes to accommodate the missing reference functionality.
MAX4081SASA+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:
- Active
- 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
MAX4081SASA+T FAQ
1.How can I place an order for MAX4081SASA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4081SASA+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 MAX4081SASA+T reliable?
The price and inventory of MAX4081SASA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4081SASA+T is usually 5 days.
3.What payment methods are accepted for MAX4081SASA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4081SASA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4081SASA+T?
MAX4081SASA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4081SASA+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 MAX4081SASA+T?
For technical support, including MAX4081SASA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4081SASA+T requirements.
6.How does Aetrix verify that MAX4081SASA+T is sourced from the original manufacturer or authorized distributors?
All MAX4081SASA+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 MAX4081SASA+T meets industry standards.
7.What is the process for return or replacement of MAX4081SASA+T?
All MAX4081SASA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4081SASA+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 MAX4081SASA+T part is unused and in its original packaging.
Return procedure for MAX4081SASA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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