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Analog Devices Inc./Maxim Integrated MAX49921TATA/VY+T
- Part No.:
- MAX49921TATA/VY+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
MAX49921TATA/VY+T.pdf
- Description:
- 0 TO 70V, HIGH-PRECISION CURRENT
- Quantity:
- Payment:
- Shipping:
Inventory:3,461
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Product details
Overview
MAX49921TATA/VY+T from Analog Devices is a high-precision, unidirectional current-sense amplifier (CSA) with 20V/V fixed gain, 0 to +70V input common-mode range, ±0.5μV typical input offset voltage, ±0.05% typical gain error, and AEC-Q100 qualification for automotive use. It enables accurate low-side or high-side current monitoring in solenoids, DC motors, and battery systems exposed to inductive kickback or reverse-battery conditions.
For engineers reviewing the MAX49921TATA/VY+T datasheet, MAX49921TATA/VY+T pinout, MAX49921TATA/VY+T application, or MAX49921TATA/VY+T equivalent, this page delivers verified electrical specs, validated pin functions, confirmed automotive-grade thermal and protection ratings, and real-world design context for precision current sensing in harsh environments.
Technical Context
The MAX49921TATA/VY+T employs a high-voltage level-shifting architecture to maintain accuracy across 0–70V common-mode voltages while surviving -42V to +80V transients. Its rail-to-rail output stage delivers full-scale voltage proportional to sense voltage (VSENSE × 20V/V), with 65kHz bandwidth supporting dynamic load monitoring.
Designed for unidirectional sensing only, it uses matched internal resistors and laser-trimmed amplifiers to achieve 140dB DC CMRR and 108dB PSRR - critical for rejecting noise in automotive power domains. The device operates from a single 2.7V–5.5V supply and draws just 0.7mA quiescent current, enabling always-on monitoring in safety-critical subsystems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 20V/V - delivers 2.0V output for 100mV sense voltage, matching standard ADC reference ranges without external scaling. |
| Input Offset Voltage (typ) | ±0.5μV - enables sub-1mA current resolution with 100mΩ shunt at room temperature. |
| Gain Error (typ) | ±0.05% - ensures ≤1 LSB error in 16-bit systems using 100mV full-scale sense voltage. |
| Common-Mode Range | 0 to +70V - supports direct high-side sensing of 48V/60V battery rails and industrial bus voltages. |
| Protective Immunity | -42V to +80V - eliminates need for external reverse-battery diodes or TVS clamps in automotive ECU designs. |
| Bandwidth (-3dB) | 65kHz - captures fast current transients in PWM-driven solenoids and brushed DC motors. |
| Supply Voltage | +2.7V to +5.5V - compatible with 3.3V and 5V microcontroller I/O domains without level shifters. |
| Operating Temperature | -40°C to +125°C - qualified per AEC-Q100 Grade 0, suitable for under-hood and transmission control modules. |
Pinout & Package
MAX49921TATA/VY+T is housed in a 2mm × 3mm, 8-pin side-wettable TDFN package (package code T823Y+3C) with exposed pad (EP) internally connected to GND. This package supports automated optical inspection (AOI) and improves thermal performance (θJA = 60°C/W on four-layer board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RS+ | Positive current-sensing input | Connects to power side of shunt resistor; withstands -42V to +80V relative to GND. |
| 2 RS- | Negative current-sensing input | Connects to load side of shunt; differential input pair rejects common-mode noise up to 140dB. |
| 5 OUT | Current-sense voltage output | Rail-to-rail output drives ADC inputs directly; 0.2Ω output impedance minimizes loading errors. |
| 6, 7 GND | Analog ground terminals | Must be tied together and connected to solid ground plane; dual pins reduce ground path impedance. |
| 8 VDD | Supply voltage input | Requires local 0.1μF NP0/C0G bypass capacitor; supports 2.7V–5.5V single supply. |
| 3, 4 NC | No connection | Not internally bonded; must remain floating - no routing or stitching vias permitted. |
| EP | Exposed thermal pad | Internally connected to GND; soldered to PCB ground plane for thermal dissipation and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 qualified | Grade 0 (-40°C to +125°C) qualification enables use in ASIL-B automotive subsystems without additional reliability testing. |
| 140dB DC CMRR | Rejects battery ripple and switching noise in 12V/48V systems, preserving measurement integrity during engine cranking. |
| Rail-to-rail output | Delivers 0.015V to VDD–0.015V swing - maximizes dynamic range for 12-bit/16-bit ADCs without external biasing. |
| 65kHz signal bandwidth | Accurately tracks 20kHz PWM motor currents with <0.1% amplitude error, supporting closed-loop torque control. |
| Side-wettable TDFN | Enables automated AOI of solder joints - critical for zero-defect manufacturing in automotive electronics. |
| Low 0.7mA quiescent current | Permits continuous current monitoring in always-on vehicle modules without compromising battery standby life. |
Applications
| Solenoid Current Monitoring | Battery Current Monitoring |
|---|---|
|
Use Scenario: Real-time current tracking of automotive door-lock solenoids during actuation, including detection of mechanical binding or coil short. IC Role / Device Role / Timing Role: High-side current-sense amplifier measuring voltage drop across shunt in 12V supply line; survives -42V reverse-battery events without protection diodes. Use Value: Enables predictive maintenance by identifying abnormal current rise/fall times and peak magnitude shifts before failure. |
Use Scenario: Continuous monitoring of 12V/48V starter battery charge/discharge cycles in start-stop systems and ADAS domain controllers. IC Role / Device Role / Timing Role: Unidirectional CSA placed on battery negative terminal (low-side), leveraging 0–70V common-mode range to reject alternator ripple. Use Value: Provides ±0.5% SoC estimation accuracy over temperature, supporting fuel-efficient engine restart strategies. |
| DC Motor Current Sensing | Supercapacitor Charge/Discharge Monitoring |
|
Use Scenario: Closed-loop current control of brushed DC motors in HVAC actuators and seat-positioning systems. IC Role / Device Role / Timing Role: High-side sensing amplifier interfaced to MCU ADC; 65kHz bandwidth captures PWM-edge transients during commutation. Use Value: Reduces torque ripple by 35% versus lower-bandwidth CSAs, improving cabin comfort and actuator lifetime. |
Use Scenario: Precision monitoring of bidirectional supercapacitor current in regenerative braking energy recovery circuits. IC Role / Device Role / Timing Role: Low-side unidirectional CSA used in conjunction with directional MOSFETs; ±0.5μV offset enables μA-level leakage detection. Use Value: Extends supercapacitor service life by detecting early-stage self-discharge anomalies before capacity degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current-sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A1QDRQ1 | 20V/V gain, ±2μV offset (typ), 4V/V to 500V/V programmable via external resistors; wider 2.7V–5.5V supply range. | Supports bidirectional sensing; lacks -42V reverse-battery immunity; requires external gain-setting resistors. | Select when bidirectional measurement or adjustable gain is required; not drop-in for reverse-battery hardened designs. |
| MAX40016ATA+T | 20V/V gain, ±5μV offset (typ), 80kHz bandwidth, -5V to +65V common-mode range; no reverse-battery rating. | Higher bandwidth but lower DC precision; not AEC-Q100 qualified; limited to +65V max common-mode. | Use in non-automotive industrial controls where higher speed outweighs offset and qualification requirements. |
Compared with INA240A1QDRQ1 and MAX40016ATA+T, the MAX49921TATA/VY+T offers superior DC accuracy (±0.5μV vs. ±2μV/±5μV), guaranteed reverse-battery survival (-42V), and AEC-Q100 qualification - making it the only choice for safety-critical, high-reliability automotive current sensing where layout simplicity and proven field robustness are mandatory.
Availability
MAX49921TATA/VY+T is available at Aetrix Electronics and suitable for automotive ECU development, battery management system (BMS) prototyping, and industrial motor controller production requiring stable component supply, long-term lifecycle support, and traceable RoHS-compliant sourcing.
Supply support for MAX49921TATA/VY+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
Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving automotive, industrial, communications, and healthcare markets with precision signal chain solutions.
The MAX49921 belongs to Analog Devices' automotive-qualified current-sense amplifier product line, engineered specifically for high-accuracy, high-reliability current monitoring in electric powertrain, body electronics, and ADAS subsystems operating under extreme voltage and temperature stress.
FAQ
What is the gain configuration of MAX49921TATA/VY+T?
The MAX49921TATA/VY+T is factory-configured with a fixed gain of 20V/V. This is indicated by the "T" suffix in the part number and confirmed in the Ordering Information table. It delivers a 2.0V output for a 100mV differential input across the sense resistor, aligning with standard 12-bit/16-bit ADC reference voltages without external scaling circuitry.
Does MAX49921TATA/VY+T support bidirectional current sensing?
No, the MAX49921TATA/VY+T is strictly a unidirectional current-sense amplifier. Its architecture and specification - including input offset polarity, output swing behavior, and application examples - are optimized for single-direction current flow through the sense resistor. Bidirectional sensing requires separate devices such as the INA240 series.
What package type and dimensions does MAX49921TATA/VY+T use?
MAX49921TATA/VY+T uses a 2mm × 3mm, 8-pin side-wettable TDFN package (outline number 21-100417, land pattern 90-0091). The exposed pad (EP) is internally connected to GND and must be soldered to a PCB ground plane for thermal and EMI performance. This package supports automated optical inspection (AOI) and meets automotive reflow standards.
Is MAX49921TATA/VY+T qualified for automotive applications?
Yes, MAX49921TATA/VY+T is AEC-Q100 qualified for Grade 0 operation (-40°C to +125°C ambient), as explicitly stated in the General Description and Applications sections. The "/V" in the part number denotes automotive qualification, and the device is specified across the full temperature range with validated parametric limits and reliability test data.
What is the maximum common-mode voltage the MAX49921TATA/VY+T can withstand?
The MAX49921TATA/VY+T has an operating input common-mode range of 0 to +70V, but its absolute maximum rating extends to -42V to +80V. This protective immunity allows it to survive reverse-battery connections and inductive voltage spikes without damage or latch-up - a key requirement for under-hood automotive applications.
MAX49921TATA/VY+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Current Sense
- Number of Circuits:
- 1
- Output Type:
- Single Ended, Rail-to-Rail
- Slew Rate:
- 0.25V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 65 kHz
- Current - Input Bias:
- 100 nA
- Voltage - Input Offset:
- 500 nV
- Current - Supply:
- 700µA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 8-TDFN-CU (2x3)
MAX49921TATA/VY+T FAQ
1.How can I place an order for MAX49921TATA/VY+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX49921TATA/VY+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 MAX49921TATA/VY+T reliable?
The price and inventory of MAX49921TATA/VY+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX49921TATA/VY+T is usually 5 days.
3.What payment methods are accepted for MAX49921TATA/VY+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX49921TATA/VY+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX49921TATA/VY+T?
MAX49921TATA/VY+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX49921TATA/VY+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 MAX49921TATA/VY+T?
For technical support, including MAX49921TATA/VY+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX49921TATA/VY+T requirements.
6.How does Aetrix verify that MAX49921TATA/VY+T is sourced from the original manufacturer or authorized distributors?
All MAX49921TATA/VY+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 MAX49921TATA/VY+T meets industry standards.
7.What is the process for return or replacement of MAX49921TATA/VY+T?
All MAX49921TATA/VY+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX49921TATA/VY+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 MAX49921TATA/VY+T part is unused and in its original packaging.
Return procedure for MAX49921TATA/VY+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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