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Home > Products > Integrated Circuits (ICs) > Linear > Instrumentation, Op Amps, Buffer Amps

Analog Devices Inc./Maxim Integrated MAX4080TAUA/V+T

Name: MAX4080TAUA/V+T
Brand: Analog Devices Inc./Maxim Integrated
SKU: MAX4080TAUA/V+T
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MAX4080TAUA/V+T

Manufacturer:: Analog Devices Inc./Maxim Integrated

Category:: Instrumentation, Op Amps, Buffer Amps

Package:: 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)

Datasheet:: MAX4080TAUA/V+T.pdf

Description:: IC CURRENT SENSE 1 CIRCUIT 8UMAX

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Product details

Overview

MAX4080TAUA/V+T from Maxim Integrated is a unidirectional, high-side current-sense amplifier with 20V/V gain, 4.5V–76V common-mode input range, ±125mV full-scale sense voltage, and 75µA supply current. It operates across –40°C to +125°C and is housed in an automotive-qualified 8-pin µMAX package. It enables precise high-voltage battery monitoring in telecom power systems and 24V/42V automotive subsystems.

For engineers reviewing the MAX4080TAUA/V+T datasheet, MAX4080TAUA/V+T pinout, MAX4080TAUA/V+T application, or MAX4080TAUA/V+T equivalent, key selection criteria include its 20V/V fixed gain, unidirectional sensing architecture, 100µV max input offset at +25°C, 124dB CMRR, and compatibility with Kelvin-layout current-sense resistors for high-accuracy measurement under high common-mode stress.

Technical Context

The MAX4080TAUA/V+T implements a precision current mirror-based amplifier topology that isolates the load ground path while supporting independent VCC (4.5V–76V) and RS+ common-mode (4.5V–76V) operation. Its internal resistor network (RG1 = RG2 = 60kΩ) sets the 20V/V gain without external components.

Unlike bidirectional variants, it delivers a single-ended output proportional to VSENSE = (RS+ − RS−), with no reference input required. Output voltage ranges from 0.15V above GND (at VSENSE = 250mV, sourcing 500µA) up to VCC − 0.27V, enabling direct interface with 3.3V/5V ADCs in high-side configurations.

Key Specifications

Parameter	Value and Actual Design Meaning
Gain	20V/V - fixed internal ratio; sets output as 20× sensed voltage across RSENSE, eliminating external gain-setting resistors.
Full-Scale Sense Voltage	±250mV - maximum differential input before output saturation; defines minimum RSENSE for target load current (e.g., 12.5A @ 20mΩ).
Input Offset Voltage	±0.1mV (typ), ±1.2mV (max over temp) - ensures <0.5% error at 250mV full scale; critical for low-current accuracy in battery charge monitoring.
Common-Mode Rejection Ratio	100–124dB - suppresses noise from high-voltage bus transients (e.g., 48V telecom backplane switching noise) at the input stage.
Supply Current	75µA (typ), 190µA (max) - enables always-on current monitoring in power-constrained automotive modules without significant battery drain.
Bandwidth	250kHz - supports accurate sensing of fast-switching loads like motor drivers or DC-DC converter outputs.
Operating Temperature	–40°C to +125°C - qualified for under-hood automotive use and industrial telecom equipment with extended thermal cycling.

Pinout & Package

MAX4080TAUA/V+T is packaged in an 8-pin µMAX® (U8+1) package - a 3mm × 3mm, 0.5mm pitch, thermally enhanced lead-free RoHS-compliant surface-mount package optimized for space-constrained high-voltage PCB layouts.

Pin/Terminal	Circuit Role	Design Meaning
1 RS+	High-side sense input (+)	Connects to positive terminal of external current-sense resistor; withstands up to +80V absolute max relative to GND.
2 VCC	Supply voltage input	Independent 4.5V–76V supply rail; decoupled with ≥0.1µF ceramic capacitor; may be tied to RS+ or separate regulated source.
3,6,7 N.C.	No internal connection	Unbonded pins; must remain floating or grounded per layout best practice-no signal routing or thermal relief required.
4 GND	Analog ground reference	Return path for internal circuitry; requires low-impedance connection to system ground plane, separate from power ground if possible.
5 OUT	Voltage output	Single-ended analog output proportional to VSENSE; swings 0.15V above GND to VCC − 0.27V; drives 100kΩ loads directly.
8 RS−	High-side sense input (−)	Connects to load side of sense resistor; forms differential pair with RS+; common-mode voltage matches RS+ within ±80V.

Key Features

Feature	Design Value
20V/V fixed gain	Eliminates external gain-setting resistors and associated layout sensitivity-reduces BOM count and improves production consistency.
±0.1% full-scale accuracy	Guaranteed gain error over temperature and supply voltage enables direct current readout without calibration in production test.
76V independent common-mode range	Allows monitoring of 48V telecom supplies or 42V automotive batteries even when VCC is derived from a lower auxiliary rail (e.g., 5V).
100µV input offset voltage (max at +25°C)	Enables accurate sub-ampere current detection with standard 100mΩ shunts-critical for standby current validation in ECUs.
8-pin µMAX package	3mm × 3mm footprint saves >50% board area vs. SO-8; exposed pad improves thermal performance for continuous 75µA operation at +125°C.

Applications

Automotive Battery Monitoring	48V Telecom Backplane Sensing
Use Scenario: Real-time monitoring of starter battery discharge during cold-cranking and alternator charging current in 12V/42V hybrid architectures. IC Role / Device Role / Timing Role: High-side current-sense amplifier measuring VSENSE across shunt resistor upstream of load switch; provides analog output to MCU ADC. Use Value: Enables predictive battery health diagnostics and load shedding decisions using ±250mV full-scale range and 20V/V gain-no external op-amps or level-shifting needed.	Use Scenario: Continuous current monitoring on 48V DC distribution rails in telecom server shelves and base station power modules. IC Role / Device Role / Timing Role: Unidirectional high-side sensor interfacing with isolated ADC via transformer-coupled output; rejects common-mode noise from adjacent switching converters. Use Value: 124dB CMRR and 250kHz bandwidth ensure accurate measurement amid 100kHz+ PWM noise; 75µA quiescent current minimizes impact on backup battery runtime.
Precision Power-Management Systems	Motor Drive Current Feedback
Use Scenario: Accurate input current measurement in industrial DC-DC converters and programmable power supplies requiring <1% full-scale line/load regulation. IC Role / Device Role / Timing Role: High-side current monitor placed between input filter and primary switch; output scaled to match 0–5V ADC input range. Use Value: ±1.2mV max input offset and ±0.6% gain error over –40°C to +125°C eliminate need for per-unit calibration-reducing test time and cost.	Use Scenario: Phase current sensing in brushed DC or BLDC motor controllers where ground-referenced shunts introduce noise coupling into control logic. IC Role / Device Role / Timing Role: High-side amplifier replacing low-side shunt + op-amp combo; outputs linear voltage proportional to motor winding current. Use Value: 250kHz bandwidth captures transient current peaks during commutation; 20V/V gain allows use of 5mΩ shunts-reducing I²R loss and thermal drift.

Automotive Battery Monitoring

48V Telecom Backplane Sensing

Use Scenario: Real-time monitoring of starter battery discharge during cold-cranking and alternator charging current in 12V/42V hybrid architectures.

IC Role / Device Role / Timing Role: High-side current-sense amplifier measuring VSENSE across shunt resistor upstream of load switch; provides analog output to MCU ADC.

Use Value: Enables predictive battery health diagnostics and load shedding decisions using ±250mV full-scale range and 20V/V gain-no external op-amps or level-shifting needed.

Use Scenario: Continuous current monitoring on 48V DC distribution rails in telecom server shelves and base station power modules.

IC Role / Device Role / Timing Role: Unidirectional high-side sensor interfacing with isolated ADC via transformer-coupled output; rejects common-mode noise from adjacent switching converters.

Use Value: 124dB CMRR and 250kHz bandwidth ensure accurate measurement amid 100kHz+ PWM noise; 75µA quiescent current minimizes impact on backup battery runtime.

Precision Power-Management Systems

Motor Drive Current Feedback

Use Scenario: Accurate input current measurement in industrial DC-DC converters and programmable power supplies requiring <1% full-scale line/load regulation.

IC Role / Device Role / Timing Role: High-side current monitor placed between input filter and primary switch; output scaled to match 0–5V ADC input range.

Use Value: ±1.2mV max input offset and ±0.6% gain error over –40°C to +125°C eliminate need for per-unit calibration-reducing test time and cost.

Use Scenario: Phase current sensing in brushed DC or BLDC motor controllers where ground-referenced shunts introduce noise coupling into control logic.

IC Role / Device Role / Timing Role: High-side amplifier replacing low-side shunt + op-amp combo; outputs linear voltage proportional to motor winding current.

Use Value: 250kHz bandwidth captures transient current peaks during commutation; 20V/V gain allows use of 5mΩ shunts-reducing I²R loss and thermal drift.

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-side current-sense amplifier applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MAX4080TASA+	Same 20V/V gain, unidirectional function, and electrical specs-but in 8-pin SO package (5mm × 4mm), not µMAX.	Preferred where thermal mass or hand-solderability outweighs board-area constraints; SO package offers higher power dissipation (471mW vs. 362mW).	Select MAX4080TASA+ for prototyping, manual assembly, or legacy SO footprints; choose MAX4080TAUA/V+T for space-constrained automotive modules requiring AEC-Q100 qualification.
INA282AIDR	20V/V gain, 36V max common-mode, 120dB CMRR, 1.1mA supply current-higher power, lower voltage range, and different pinout.	Suitable for 24V industrial PLCs but not 48V telecom or 42V automotive due to 36V CMVR limit; requires external gain resistors for precision trimming.	Choose INA282AIDR only when SO-8 footprint compatibility and wider temp range (–40°C to +125°C) are acceptable trade-offs for reduced CMVR and higher quiescent current.

Compared with MAX4080TASA+, MAX4080TAUA/V+T saves >60% PCB area and meets automotive qualification; compared with INA282AIDR, it delivers 40dB higher CMRR, 15× lower supply current, and guaranteed 76V common-mode operation-making it uniquely suited for high-reliability, high-voltage, low-power sensing.

Availability

MAX4080TAUA/V+T is available at Aetrix Electronics and suitable for automotive battery management, 48V telecom power distribution, and industrial motor control applications requiring stable component supply, AEC-Q100 compliance, and long-term lifecycle support.

Supply support for MAX4080TAUA/V+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-with emphasis on reliability, integration, and high-voltage robustness.

The MAX4080 family targets high-side current sensing in harsh environments, delivering integrated gain, wide common-mode range, and automotive qualification in miniature packages-enabling compact, accurate, and maintenance-free current monitoring solutions.

FAQ

What is the maximum common-mode voltage supported by the MAX4080TAUA/V+T?

The MAX4080TAUA/V+T supports a common-mode input voltage range of 4.5V to 76V-applied independently to RS+ and VCC. This allows monitoring of currents in 48V telecom systems and 42V automotive batteries even when the device's supply rail is derived from a lower-voltage auxiliary source. Absolute maximum rating is +80V for RS+ and VCC relative to GND.

Does the MAX4080TAUA/V+T require an external reference voltage?

No, the MAX4080TAUA/V+T does not require an external reference voltage. As a unidirectional current-sense amplifier, it outputs a single-ended voltage proportional to VSENSE = (RS+ − RS−) with no reference input pins. In contrast, the bidirectional MAX4081 variant uses REF1A/REF1B inputs-confirming MAX4080TAUA/V+T's simplified interface for one-directional monitoring tasks.

What is the full-scale sense voltage and corresponding output range for the MAX4080TAUA/V+T?

The MAX4080TAUA/V+T has a full-scale sense voltage of ±250mV and a fixed 20V/V gain, yielding a nominal full-scale output of 5.0V. The actual output voltage ranges from 0.15V above GND (VOH drop) up to VCC − 0.27V (VOL headroom), supporting direct connection to 3.3V or 5V ADCs without level-shifting circuitry.

How does the MAX4080TAUA/V+T differ from the MAX4080FAUA/V+T and MAX4080SAUA/V+T variants?

The MAX4080TAUA/V+T differs solely in gain: it provides 20V/V (T-suffix), whereas MAX4080FAUA/V+T offers 5V/V (F-suffix) and MAX4080SAUA/V+T offers 60V/V (S-suffix). All share identical pinout, package, temperature range, accuracy specs, and automotive qualification-allowing design reuse across current ranges by selecting the appropriate gain version and matching RSENSE value.

Is the MAX4080TAUA/V+T pin-compatible with other MAX4080 variants in the µMAX package?

Yes, all MAX4080 variants-including MAX4080FAUA/V+T, MAX4080TAUA/V+T, and MAX4080SAUA/V+T-in the 8-pin µMAX package share identical pinout, footprint, and thermal characteristics. This enables drop-in replacement during design optimization or production ramp-only the gain and full-scale sense voltage change between F/T/S versions, with no PCB layout modifications required.

MAX4080TAUA/V+T Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc./Maxim Integrated

Series:: -

Package/Case:: 8-TSSOP, 8-MSOP (0.118", 3.00mm 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:: 250 kHz

Current - Input Bias:: 5 µA

Voltage - Input Offset:: 100 µV

Current - Supply:: 75µA

Current - Output / Channel:: -

Voltage - Supply Span (Min):: 4.5 V

Voltage - Supply Span (Max):: 76 V

Operating Temperature:: -40°C ~ 125°C

Grade:: Automotive

Qualification:: AEC-Q100

Mounting Type:: Surface Mount

Supplier Device Package:: 8-uMAX/uSOP

MAX4080TAUA/V+T FAQ

1.How can I place an order for MAX4080TAUA/V+T through Aetrix?

Please submit a Request for Quotation (RFQ) for MAX4080TAUA/V+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 MAX4080TAUA/V+T reliable?

The price and inventory of MAX4080TAUA/V+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4080TAUA/V+T is usually 5 days.

3.What payment methods are accepted for MAX4080TAUA/V+T?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4080TAUA/V+T transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MAX4080TAUA/V+T?

MAX4080TAUA/V+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MAX4080TAUA/V+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 MAX4080TAUA/V+T?

For technical support, including MAX4080TAUA/V+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4080TAUA/V+T requirements.

6.How does Aetrix verify that MAX4080TAUA/V+T is sourced from the original manufacturer or authorized distributors?

All MAX4080TAUA/V+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 MAX4080TAUA/V+T meets industry standards.

7.What is the process for return or replacement of MAX4080TAUA/V+T?

All MAX4080TAUA/V+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4080TAUA/V+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 MAX4080TAUA/V+T part is unused and in its original packaging.

Return procedure for MAX4080TAUA/V+T:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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