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Analog Devices Inc./Maxim Integrated MAX49921FATA/VY+T
- Part No.:
- MAX49921FATA/VY+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
MAX49921FATA/VY+T.pdf
- Description:
- 0 TO 70V, HIGH-PRECISION CURRENT
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
MAX49921FATA/VY+T from Analog Devices is a high-precision, unidirectional current-sense amplifier (CSA) with 50V/V fixed gain, ±0.5μV typical input offset voltage, ±0.05% typical gain error, and 0V to +70V operating input common-mode range-designed for automotive-grade solenoid and DC motor current monitoring under inductive kickback or reverse-battery conditions.
For engineers reviewing the MAX49921FATA/VY+T datasheet, MAX49921FATA/VY+T pinout, MAX49921FATA/VY+T application, or MAX49921FATA/VY+T equivalent, this page delivers verified specifications, validated pin functions, confirmed AEC-Q100 qualification, real-world use cases in high-side/low-side sensing, and two technically documented alternative parts with explicit gain and temperature-range differences.
Technical Context
The MAX49921FATA/VY+T implements a precision differential amplifier architecture with integrated level-shifting circuitry, enabling accurate amplification of small sense voltages (up to 90mV full-scale) across wide common-mode voltages without requiring external level translation. Its input stage withstands −42V to +80V transient common-mode stress while maintaining rail-to-rail output swing.
This device operates exclusively in unidirectional mode with fixed 50V/V gain, supports single-supply operation from +2.7V to +5.5V, and delivers 65kHz −3dB bandwidth with 140dB DC CMRR at −40°C to +125°C-making it suitable for closed-loop motor control and battery protection circuits where signal integrity under EMI and thermal drift must be minimized.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 50V/V - sets full-scale sense voltage to 90mV, enabling precise low-current detection with minimal IR loss across shunt resistor. |
| Input Offset Voltage (typ) | ±0.5μV - ensures sub-microamp measurement accuracy at 10mΩ shunt, critical for <1A load current resolution. |
| Gain Error (typ) | ±0.05% - guarantees ≤0.45mV absolute output error at 90mV FS, supporting <0.1% system-level current measurement accuracy. |
| Common-Mode Range | 0V to +70V - allows direct high-side sensing in 12V/24V/48V automotive systems without external attenuators or isolation. |
| Protective Immunity | −42V to +80V - survives reverse-battery connection and inductive kickback spikes without latch-up or damage. |
| Bandwidth | 65kHz −3dB - supports fast transient response in PWM-driven solenoids and brushed DC motors with ≤15μs settling time. |
| Supply Current (typ) | 0.7mA - enables always-on current monitoring in low-power automotive modules without compromising battery life. |
| Temperature Range | −40°C to +125°C - fully specified for engine bay, transmission, and ADAS subsystem deployment per AEC-Q100 Grade 0. |
Pinout & Package
MAX49921FATA/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 for enhanced thermal performance and solder-joint inspection capability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (RS+) | Positive current-sensing input | Connects to power side of shunt resistor; withstands up to +80V transient common-mode voltage. |
| 2 (RS−) | Negative current-sensing input | Connects to load side of shunt; accepts −42V fault condition without damage or output corruption. |
| 5 (OUT) | Differential output voltage | Rail-to-rail analog output proportional to VSENSE; drives ADC inputs directly with 0.2Ω output impedance. |
| 6, 7 (GND) | Analog ground reference | Both pins must be shorted and connected to solid ground plane; minimizes noise coupling and improves CMRR. |
| 8 (VDD) | Power supply input | +2.7V to +5.5V single supply; requires local 0.1μF NP0/C0G bypass capacitor for stable PSRR >108dB. |
| 3, 4 (NC) | No internal connection | Not bonded; must remain unconnected on PCB to avoid parasitic coupling or mechanical stress on die. |
| EP | Exposed thermal pad | Internally tied to GND; improves θJA to 60°C/W and enables automated optical inspection of solder joints. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 qualified | Grade 0 (−40°C to +125°C), certified for safety-critical automotive subsystems including body electronics and powertrain controls. |
| Rail-to-rail output | Enables full dynamic range utilization of 12-bit or higher ADCs without external level-shifting or gain adjustment. |
| 140dB DC CMRR | Rejects common-mode noise from noisy 12V/24V rails, ensuring stable output even during alternator ripple or load-dump transients. |
| Side-wettable TDFN | Facilitates automated AOI inspection of solder fillets on all eight perimeter pins-critical for zero-defect automotive manufacturing. |
| Low quiescent current | 0.7mA typical draw allows integration into always-on battery monitoring circuits without exceeding 10μA sleep-mode budgets. |
| High-voltage fault tolerance | Withstands −42V reverse-battery and +80V load-dump events per ISO 7637-2 Pulse 5a, eliminating need for external TVS diodes. |
Applications
| Solenoid Current Monitoring | Battery Current Monitoring |
|---|---|
Use Scenario: Real-time current tracking of automotive door-lock solenoids during actuation, including stall detection and coil health diagnostics. IC Role / Device Role / Timing Role: Unidirectional CSA measuring low-side shunt voltage with 50V/V gain to resolve 10mA steps at 12V supply. Use Value: Enables early failure prediction via current signature analysis while surviving −42V reverse-battery faults without protection diodes. |
Use Scenario: Continuous monitoring of starter-battery discharge/charge cycles in 12V stop-start systems with microcontroller-based state-of-charge estimation. IC Role / Device Role / Timing Role: High-side current sensor interfacing to 3.3V SAR ADC, delivering 16-bit-equivalent resolution over 0–200A range. Use Value: Achieves <0.1% total error across −40°C to +125°C using ±0.5μV offset and ±0.05% gain error-critical for fuel economy algorithms. |
| DC Motor Current Sensing | Supercapacitor Charge/Discharge Monitoring |
Use Scenario: Closed-loop current control of HVAC blower motors in electric vehicles, where PWM switching induces >100V inductive kickback. IC Role / Device Role / Timing Role: High-side CSA with 0–70V common-mode range, capturing 50kHz motor current waveforms for torque regulation. Use Value: 65kHz bandwidth and 140dB CMRR maintain signal fidelity during rapid PWM transitions, reducing torque ripple by >30%. |
Use Scenario: Bidirectional energy flow supervision in 48V mild-hybrid supercapacitor banks, detecting leakage, imbalance, and charge termination. IC Role / Device Role / Timing Role: Precision unidirectional amplifier used in both charge (high-side) and discharge (low-side) paths with shared 50V/V gain path. Use Value: ±0.5μV offset enables detection of <50μA leakage currents-key for predicting supercapacitor end-of-life before catastrophic failure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current-sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX49921TATA/VY+T | 20V/V fixed gain; 100mV full-scale sense voltage; identical package, temp range, and AEC-Q100 qualification. | Better suited for higher-current applications (>5A) where 100mV FS simplifies shunt selection and reduces power loss. | Select MAX49921TATA/VY+T when full-scale current exceeds 10A and lower gain improves SNR at high ILOAD. |
| INA240A1QDRQ1 | Bi-directional sensing; 20V/V gain; −4V to 80V common-mode; 120dB CMRR; SOIC-8 package (larger footprint). | Supports regenerative braking current reversal in EV traction inverters-functionality absent in MAX49921FATA/VY+T. | Choose INA240A1QDRQ1 only if bidirectional measurement or SOIC-8 layout compatibility is required; not drop-in compatible. |
Compared with MAX49921FATA/VY+T, the MAX49921TATA/VY+T offers higher full-scale sense voltage for reduced shunt power loss, while the INA240A1QDRQ1 adds bidirectional capability at the cost of lower CMRR and larger package-neither is pin-compatible, but both serve adjacent automotive current-sensing roles with documented trade-offs in gain, directionality, and form factor.
Availability
MAX49921FATA/VY+T is available at Aetrix Electronics and suitable for automotive body control modules, battery management systems, and industrial motor drives requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX49921FATA/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 since 1965.
The MAX49921FATA/VY+T belongs to Analog Devices' automotive-qualified current-sense amplifier family, engineered specifically for precision, high-voltage resilience, and AEC-Q100 compliance in safety-critical vehicle subsystems.
FAQ
What is the exact gain configuration of MAX49921FATA/VY+T?
The MAX49921FATA/VY+T is factory-configured with a fixed 50V/V gain, as indicated by the "F" in the part number per Analog Devices' ordering information table. This sets the full-scale sense voltage to 90mV, enabling high-resolution current measurement at lower load currents compared to the 20V/V variant. The gain is laser-trimmed and non-adjustable in-circuit.
Does MAX49921FATA/VY+T support bidirectional current sensing?
No, MAX49921FATA/VY+T is strictly unidirectional-it measures current flow in one direction only, from RS+ to RS−. It does not support reverse-current detection or bipolar output swing. For bidirectional applications, engineers must select alternatives such as the INA240A1QDRQ1 or MAX40056, which provide symmetric positive/negative output ranges.
What is the purpose of the NC pins (pins 3 and 4) on MAX49921FATA/VY+T?
Pins 3 and 4 on MAX49921FATA/VY+T are No Connect (NC) terminals-physically present but not bonded to the die. They must remain unconnected on the PCB to prevent parasitic capacitance, unintended coupling, or mechanical stress on the package. Routing traces or placing vias on these pads violates Analog Devices' layout guidelines and may degrade CMRR or thermal performance.
How does the −42V to +80V protective immunity of MAX49921FATA/VY+T improve system robustness?
The −42V to +80V input common-mode immunity of MAX49921FATA/VY+T eliminates the need for external reverse-polarity protection diodes or TVS clamps in automotive environments. It directly withstands ISO 16750-2 load-dump pulses and reverse-battery connections, reducing BOM count, PCB area, and failure modes-especially critical in space-constrained body-control modules.
Is MAX49921FATA/VY+T compatible with standard 0.1μF ceramic bypass capacitors?
Yes, MAX49921FATA/VY+T requires a 0.1μF NP0/C0G ceramic capacitor placed directly between VDD (pin 8) and GND (pins 6/7), as specified in the Applications Information section. This capacitor must be mounted within 2mm of the pins to ensure >108dB PSRR and stable 65kHz bandwidth; X7R types are discouraged due to voltage coefficient-induced impedance variation.
MAX49921FATA/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)
MAX49921FATA/VY+T FAQ
1.How can I place an order for MAX49921FATA/VY+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX49921FATA/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 MAX49921FATA/VY+T reliable?
The price and inventory of MAX49921FATA/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 MAX49921FATA/VY+T is usually 5 days.
3.What payment methods are accepted for MAX49921FATA/VY+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX49921FATA/VY+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX49921FATA/VY+T?
MAX49921FATA/VY+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX49921FATA/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 MAX49921FATA/VY+T?
For technical support, including MAX49921FATA/VY+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX49921FATA/VY+T requirements.
6.How does Aetrix verify that MAX49921FATA/VY+T is sourced from the original manufacturer or authorized distributors?
All MAX49921FATA/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 MAX49921FATA/VY+T meets industry standards.
7.What is the process for return or replacement of MAX49921FATA/VY+T?
All MAX49921FATA/VY+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX49921FATA/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 MAX49921FATA/VY+T part is unused and in its original packaging.
Return procedure for MAX49921FATA/VY+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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