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Analog Devices Inc./Maxim Integrated MAX4081SASA+
- Part No.:
- MAX4081SASA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX4081SASA+.pdf
- Description:
- IC CURRENT SENSE 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:143
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Product details
Overview
The MAX4081SASA+ from Maxim Integrated is a 60V/V gain, bidirectional high-side current-sense amplifier with 4.5V to 76V independent common-mode and supply voltage ranges, ±50mV full-scale sense voltage, ±1.2% gain accuracy over –40°C to +125°C, and 150kHz bandwidth - enabling precise battery charge/discharge monitoring in automotive 12V/24V systems and 48V telecom backplanes.
For engineers reviewing the MAX4081SASA+ datasheet, MAX4081SASA+ pinout, MAX4081SASA+ application, or MAX4081SASA+ equivalent, key selection criteria include its bidirectional sensing capability, external reference input (REF1A/REF1B) for zero-current output alignment, 103µA supply current at 76V, and SO-8 package compatibility with board-level current measurement in space-constrained industrial power-management systems.
Technical Context
The MAX4081SASA+ implements a precision current mirror-based architecture with level-shifted output stage referenced to externally applied VREF (average of REF1A and REF1B), allowing VOUT to swing above VREF during charge and below VREF during discharge. Its differential input stage maintains high impedance at RS+/RS– while rejecting common-mode voltages up to 76V independently of VCC.
Unlike unidirectional variants, the MAX4081SASA+ supports symmetrical ±50mV input range with 60V/V gain, delivering ±3.0V full-scale output swing relative to VREF when RSENSE = 10mΩ and ILOAD = ±5A - optimized for low-loss, high-accuracy sensing in smart-battery packs and motor control feedback loops.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 60V/V - sets full-scale output to ±3.0V for ±50mV sense voltage, enabling high-resolution current measurement with minimal IR loss across sense resistor |
| Common-Mode Range | 4.5V to 76V - allows direct high-side sensing on batteries as low as 4.5V or 48V telecom rails without ground-path interference |
| Supply Current | 103µA typical at 76V - ensures ultra-low power consumption in always-on battery monitoring applications |
| Input Offset Voltage | ±1.2mV max over –40°C to +125°C - limits baseline error to ≤±2% of full-scale sense voltage (±50mV) |
| Bandwidth | 150kHz - supports accurate transient current capture in PWM-driven motor control and fast-charging circuits |
| Full-Scale Sense Voltage | ±50mV - enables use of low-value, low-inductance sense resistors (e.g., 10mΩ) to minimize power loss and thermal drift |
| Gain Accuracy | ±1.2% over full temperature range - guarantees calibrated current readout without per-unit trimming in production systems |
Pinout & Package
MAX4081SASA+ is housed in an 8-pin SO (Small Outline) package with standard 1.27mm pitch, compatible with automated PCB assembly and IPC-7351B land patterns (outline 21-0041). Thermal performance supports 471mW continuous dissipation at +70°C with 5.88mW/°C derating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RS+ | High-side sense input positive | Connects to power rail side of external sense resistor; withstands up to +80V absolute max |
| 2 VCC | Supply voltage input | Independent 4.5V–76V supply; decouple with ≥0.1µF ceramic capacitor to GND |
| 3,6,7 N.C. | No internal connection | Leave unconnected or tie to GND; no electrical function or signal routing |
| 4 GND | Analog ground reference | Return path for internal circuitry; maintain low-impedance connection to system ground plane |
| 5 OUT | Voltage output | Single-ended output swinging above/below VREF to indicate charge/discharge polarity; clamped to ≤18V |
| 8 RS− | High-side sense input negative | Connects to load side of external sense resistor; common-mode range matches RS+ |
| - REF1A | Reference voltage input A | Set zero-current output level; connect to regulated source (1.5V–6V) or pair with REF1B for VREF averaging |
| - REF1B | Reference voltage input B | Paired with REF1A to define VREF = (REF1A + REF1B)/2; connect to REF1A or GND per configuration mode |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional current sensing | Single OUT pin reports both charge and discharge direction via VOUT–VREF polarity, eliminating need for dual-output or polarity-detection circuitry |
| User-configurable reference level | VREF set by external voltage on REF1A/REF1B pins enables flexible ADC interface alignment and eliminates fixed-offset calibration |
| 76V independent common-mode range | RS+ and VCC operate at different potentials up to 76V - supports monitoring of 48V backplane currents while powered from isolated 5V rail |
| ±1.2% gain accuracy over temperature | Guaranteed performance across –40°C to +125°C enables automotive under-hood deployment without external gain compensation |
| 150kHz small-signal bandwidth | Accurately tracks fast current transients in BLDC motor commutation and synchronous rectifier control loops |
Applications
| Automotive Battery Management | 48V Telecom Backplane Monitoring |
|---|---|
Use Scenario: Real-time tracking of charge/discharge cycles in 12V/24V starter batteries and 48V mild-hybrid systems. IC Role / Device Role / Timing Role: High-side current sensor providing bidirectional analog output to MCU ADC for state-of-charge estimation and fault detection. Use Value: ±50mV input range with 60V/V gain delivers ±3.0V output swing referenced to user-set VREF, enabling direct interface with 3.3V ADCs without level-shifting. | Use Scenario: Continuous current measurement on 48V DC distribution rails in telecom base stations and server PSUs. IC Role / Device Role / Timing Role: High-voltage sense amplifier isolating measurement circuitry from noisy power planes while maintaining signal integrity. Use Value: 4.5V–76V common-mode range allows direct connection to 48V rail without attenuation networks, reducing component count and board area. |
| Bidirectional Motor Control Feedback | Smart Power Supply Current Sensing |
Use Scenario: Closed-loop current regulation in H-bridge driven DC motors and stepper drivers. IC Role / Device Role / Timing Role: Bidirectional analog current monitor feeding real-time feedback to PWM controller or digital signal processor. Use Value: 150kHz bandwidth captures rapid current reversals during commutation, while ±1.2mV offset ensures <±2% error at 1A full-scale with 10mΩ RSENSE. | Use Scenario: Input/output current monitoring in programmable lab power supplies and industrial DC-DC converters. IC Role / Device Role / Timing Role: Precision high-side sensor enabling overcurrent protection, efficiency calculation, and dynamic load profiling. Use Value: 103µA quiescent current minimizes self-heating error in high-accuracy measurement paths, supporting <0.1% full-scale error stability over time. |
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 |
|---|---|---|---|
| INA226AIDGST | 2.7V–5.5V supply only; I²C digital output; 16-bit resolution; integrated shunt resistor not supported | Requires microcontroller with I²C interface; unsuitable for analog-only or high-voltage (>5.5V) supply environments | Select when digital bus communication and high-resolution logging are prioritized over analog simplicity and wide supply range |
| MAX40056ATA+T | Unidirectional only; 80V common-mode; 100kHz bandwidth; 50µA supply current; TDFN-8 package | Lacks bidirectional capability; requires separate polarity detection circuitry for battery monitoring | Select when only charge-current monitoring is needed and ultra-low power or smaller footprint is critical |
Compared with INA226AIDGST and MAX40056ATA+T, the MAX4081SASA+ uniquely combines true bidirectional analog output, 4.5V–76V supply flexibility, and SO-8 manufacturability - making it optimal for cost-sensitive, analog-centric designs requiring robust high-voltage current telemetry without digital overhead.
Availability
MAX4081SASA+ is available at Aetrix Electronics and suitable for automotive battery management, 48V telecom backplane monitoring, and bidirectional motor control applications requiring stable component supply and long-term industrial lifecycle support.
Supply support for MAX4081SASA+ 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 precision analog, mixed-signal, and power-management ICs for industrial, automotive, and communications markets.
The MAX4080/MAX4081 product line was designed specifically for high-voltage, high-accuracy current sensing in safety-critical power systems - emphasizing wide common-mode range, low offset drift, and robust operation across extended automotive temperature grades.
FAQ
What is the maximum common-mode voltage the MAX4081SASA+ can measure?
The MAX4081SASA+ supports a common-mode input voltage range of 4.5V to 76V at RS+ and RS– terminals, independent of its VCC supply voltage. This allows direct high-side sensing on 48V telecom rails or 72V industrial buses without level-shifting circuitry. Absolute maximum rating is +80V, but operation beyond 76V violates guaranteed specifications.
How does the MAX4081SASA+ achieve bidirectional current sensing with a single output pin?
The MAX4081SASA+ uses external reference inputs REF1A and REF1B to establish VREF = (REF1A + REF1B)/2. When VSENSE = 0, VOUT = VREF. Positive VSENSE (charge) drives VOUT above VREF; negative VSENSE (discharge) pulls VOUT below VREF - enabling polarity detection and magnitude scaling using one analog output pin.
What is the full-scale sense voltage and corresponding output range for the MAX4081SASA+?
The MAX4081SASA+ has a full-scale sense voltage of ±50mV due to its 60V/V gain. With VREF set to 2.5V, the output spans approximately 2.5V ± 3.0V - i.e., –0.5V to +5.5V - though output clamping limits VOUT to ≤18V and ≥–0.3V. The usable linear range depends on VCC and VREF selection to avoid clipping.
Can the MAX4081SASA+ operate with VCC lower than the common-mode voltage at RS+?
Yes. The MAX4081SASA+ features independent supply and common-mode voltage domains: VCC may be as low as 4.5V while RS+ operates up to 76V. This enables monitoring of high-voltage battery strings using a low-voltage isolated auxiliary supply - a key advantage over conventional op-amp-based solutions requiring matched rail voltages.
What package type and RoHS status does the MAX4081SASA+ have?
The MAX4081SASA+ is supplied in an 8-pin SO (Small Outline) package with standard 1.27mm lead pitch and is lead(Pb)-free/RoHS-compliant, indicated by the '+' suffix. It follows JEDEC MS-012 outline and is compatible with reflow soldering profiles up to +260°C peak temperature.
MAX4081SASA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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+ FAQ
1.How can I place an order for MAX4081SASA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4081SASA+ 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+ reliable?
The price and inventory of MAX4081SASA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4081SASA+ is usually 5 days.
3.What payment methods are accepted for MAX4081SASA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4081SASA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4081SASA+?
MAX4081SASA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4081SASA+ 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+?
For technical support, including MAX4081SASA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4081SASA+ requirements.
6.How does Aetrix verify that MAX4081SASA+ is sourced from the original manufacturer or authorized distributors?
All MAX4081SASA+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX4081SASA+?
All MAX4081SASA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX4081SASA+, 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+ part is unused and in its original packaging.
Return procedure for MAX4081SASA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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