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Analog Devices Inc./Maxim Integrated MAX9919NASA/V+T
- Part No.:
- MAX9919NASA/V+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
MAX9919NASA/V+T.pdf
- Description:
- IC CURRENT SENSE 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,149
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Product details
Overview
The MAX9919NASA/V+T from Maxim Integrated is a fixed-gain, AEC-Q100 qualified, unidirectional/bidirectional current-sense amplifier optimized for automotive inductive load monitoring. It features 90V/V gain, ±50mV full-scale sense voltage, -20V to +75V input common-mode range, 400µV max input offset voltage, and operates from a single 4.5V–5.5V supply across -40°C to +125°C - enabling precise H-bridge motor or solenoid current sensing under reverse-battery or inductive-kickback conditions.
For engineers reviewing the MAX9919NASA/V+T datasheet, MAX9919NASA/V+T pinout, MAX9919NASA/V+T application, or MAX9919NASA/V+T equivalent, this device delivers automotive-grade accuracy in an 8-pin SOIC-EP package with rail-to-rail output, shutdown control, and reference-input flexibility for uni-/bidirectional configurations - critical for battery management, chassis control, and powertrain current monitoring.
Technical Context
The MAX9919NASA/V+T employs dual-level-shifting input architecture to sustain operation across -20V to +75V common-mode voltages, switching between level shifters at ~+2V to handle negative transients. Its laser-trimmed 90V/V gain eliminates external resistor networks while maintaining ≤0.6% gain error over temperature.
It supports both unidirectional (REFIN = GND) and bidirectional (REFIN = VCC/2) modes via internal instrumentation amplifier topology, delivering rail-to-rail output swing and 120kHz -3dB bandwidth. Shutdown mode reduces supply current to ≤10µA, and the exposed pad ensures thermal stability under continuous 1.5mA load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | Fixed 90V/V - enables direct 50mV sense voltage scaling to 4.5V full-scale output at 5V supply, eliminating gain-setting resistors and layout sensitivity. |
| Input Common-Mode Range | -20V to +75V - supports reverse-battery protection and inductive kickback tolerance without clamping diodes in automotive 12V/24V systems. |
| Input Offset Voltage | ±0.4mV max (–40°C to +125°C) - ensures <0.8% current measurement error at 50mV full-scale, critical for low-current precision in solenoid control. |
| Bandwidth | 120kHz –3dB - captures fast current transients in PWM-driven motors and enables real-time closed-loop current limiting. |
| Supply Voltage | 4.5V to 5.5V - compatible with standard automotive 5V LDO rails and immune to brown-out during cranking. |
| Temperature Range | –40°C to +125°C - fully specified for under-hood engine control unit (ECU) and transmission control module (TCM) environments. |
| AEC-Q100 Grade | Grade 0 (–40°C to +150°C junction) - certified for safety-critical automotive applications including ISO 26262 ASIL-B supporting functions. |
Pinout & Package
Package: 8-pin SOIC with exposed pad (SO-EP), RoHS-compliant, lead-free, automotive qualified (/V+ suffix). Exposed pad must be connected to solid ground for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RS+ | Positive current-sense input | Connects to high-side of sense resistor; withstands –30V to +80V relative to GND - handles negative inductive kickback directly. |
| 2 RS– | Negative current-sense input | Connects to low-side of sense resistor; differential input accepts ±15V (max) VRS+–VRS– - supports bidirectional current flow detection. |
| 3 SHDN | Active-high shutdown control | Logic-high (>2.0V) disables amplifier and reduces ICC to ≤10µA - enables power-gating in sleep-mode ECUs. |
| 4 GND | Analog/digital ground reference | Primary ground return; exposed pad must be tied to same plane - prevents ground loop errors in high-current PCB layouts. |
| 5 OUT | Current-sense output | Rail-to-rail voltage output proportional to VSENSE; drives 100kΩ loads with ≤10mV error - interfaces directly with 12-bit ADCs without buffering. |
| 6 FB | Feedback input | No connection required - internally terminated for fixed-gain operation; leaving floating avoids instability or gain drift. |
| 7 REFIN | Reference input | Set to GND for unidirectional (0–4.5V output) or VCC/2 for bidirectional (±2.5V around 2.5V) - defines output zero-current baseline. |
| 8 VCC | 5V supply input | Requires 0.1µF ceramic bypass capacitor to GND - suppresses supply noise coupling into high-gain analog path. |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | AEC-Q100 Grade 0 certified - validated for lifetime reliability in harsh under-hood environments with thermal cycling and vibration stress. |
| Wide common-mode tolerance | –20V to +75V input range - eliminates need for external level-shifting circuitry when monitoring high-side or low-side current in 24V commercial vehicles. |
| Laser-trimmed fixed gain | 90V/V with ±0.6% max gain error - guarantees consistent signal chain gain without calibration or resistor matching tolerances. |
| Rail-to-rail output | Drives within 10mV of VCC or GND - maximizes dynamic range for 5V-supplied microcontrollers with 12-bit ADCs (e.g., 0–4.99V span). |
| Shutdown control | ≤10µA quiescent current in SHDN mode - extends battery life in always-on vehicle modules such as body control units (BCUs). |
Applications
| H-Bridge Motor Current Sensing | Solenoid Current Sensing |
|---|---|
Use Scenario: Real-time phase current monitoring in electric power steering (EPS) or HVAC blower motor drivers using PWM-controlled H-bridges. IC Role / Device Role / Timing Role: High-side or low-side current-sense amplifier providing analog feedback to MCU for torque control and overcurrent shutdown. Use Value: Enables <1% current measurement accuracy despite ±20V bus transients, reducing false overcurrent trips and improving motor efficiency. |
Use Scenario: Monitoring 12V/24V solenoid actuator current in transmission shift control or fuel injector driver modules. IC Role / Device Role / Timing Role: Bidirectional current sensor detecting energize/de-energize transitions and coil health via current slope analysis. Use Value: Supports diagnostic compliance (e.g., UDS Mode 09) by resolving <5mA current changes at 50mV full-scale, even during battery dip events. |
| High-Side Precision Current Sensing | Automotive Battery Management |
Use Scenario: High-side current monitoring in 12V starter-generator or 48V mild-hybrid DC-DC converter primary side. IC Role / Device Role / Timing Role: Unidirectional current amplifier referenced to GND, interfacing with isolated ADC or MCU via reinforced isolation barrier. Use Value: Eliminates need for isolated power supplies on the sense side due to –20V to +75V CMR - simplifies BOM and improves system MTBF. |
Use Scenario: Charge/discharge current sensing in 12V auxiliary battery or supercapacitor backup systems for ADAS domain controllers. IC Role / Device Role / Timing Role: Bidirectional amplifier with VREFIN = VCC/2, feeding current data to battery management IC for state-of-charge (SoC) estimation. Use Value: Delivers ±0.5% full-scale accuracy across –40°C to +85°C ambient - meets OEM requirements for battery health reporting per ISO 16750-4. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current-sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX40056ATA+T | Fixed 100V/V gain, 200kHz bandwidth, ±100mV VSENSE, same SO-EP package but no AEC-Q100 certification. | Higher bandwidth suits fast-switching SiC inverters; lacks automotive qualification and extended –20V CMR. | Select for industrial motor drives where AEC-Q100 is not mandated and higher speed is prioritized over reverse-battery robustness. |
| INA240A1QDRQ1 | Fixed 20V/V gain, 400kHz bandwidth, –5V to +85V CMR, AEC-Q100 Grade 1, SO-8 package with integrated ESD protection. | Lower gain requires larger sense resistor for same output swing; wider CMR but higher offset (±100µV typ) limits low-current resolution. | Select when measuring higher currents (>5A) with lower sense voltage drop, or when enhanced ESD immunity (±4kV HBM) is required in infotainment subsystems. |
Compared with MAX40056ATA+T and INA240A1QDRQ1, the MAX9919NASA/V+T uniquely balances AEC-Q100 Grade 0 qualification, –20V reverse-battery tolerance, and 90V/V gain optimized for 50mV sense resistors - making it the preferred choice for precision current feedback in safety-critical automotive actuators where layout simplicity and transient resilience are non-negotiable.
Availability
MAX9919NASA/V+T is available at Aetrix Electronics and suitable for automotive powertrain control, chassis electronics, and battery management systems requiring stable component supply across multi-year production cycles and stringent PPAP compliance.
Supply support for MAX9919NASA/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, communications, and automotive applications - emphasizing high reliability, low power, and integration.
The MAX9918/MAX9919/MAX9920 family was engineered specifically for automotive current sensing, addressing challenges like reverse-battery survival, inductive kickback, and wide-temperature operation - with the MAX9919NASA/V+T targeting high-accuracy, fixed-gain implementations in safety-critical modules.
FAQ
What is the maximum common-mode voltage the MAX9919NASA/V+T can withstand?
The MAX9919NASA/V+T supports an input common-mode voltage range of –20V to +75V. This allows it to survive reverse-battery conditions (–14V typical) and inductive kickback spikes up to +75V in automotive 12V/24V systems without damage or output saturation - a key differentiator versus standard op-amps or lower-voltage current-sense amplifiers.
Does the MAX9919NASA/V+T require external gain-setting resistors?
No. The MAX9919NASA/V+T features laser-trimmed fixed gain of 90V/V - no external resistors are needed or recommended. Pin 6 (FB) must remain unconnected to ensure proper operation and avoid gain deviation or instability. This simplifies PCB layout and eliminates resistor tolerance-induced measurement errors.
How does the MAX9919NASA/V+T support bidirectional current sensing?
The MAX9919NASA/V+T supports bidirectional operation by applying a stable reference voltage (typically VCC/2) to the REFIN pin (Pin 7). When configured this way, the output voltage (OUT) becomes centered at VREFIN, so positive VSENSE produces VOUT > VREFIN and negative VSENSE produces VOUT < VREFIN - enabling charge/discharge current discrimination in battery systems.
Is the MAX9919NASA/V+T qualified for automotive use?
Yes. The MAX9919NASA/V+T carries the /V+ suffix indicating AEC-Q100 qualification (Grade 0), meaning it is tested and guaranteed for operation from –40°C to +150°C junction temperature, with full characterization for thermal cycling, humidity, and mechanical shock - meeting OEM requirements for engine control, transmission, and ADAS modules.
What is the purpose of the exposed pad (EP) on the MAX9919NASA/V+T package?
The exposed pad (EP) on the MAX9919NASA/V+T serves dual thermal and electrical functions: it must be soldered to a large-area contiguous ground plane to dissipate heat (θJA = 41°C/W on 4-layer board) and reduce junction temperature rise, and also provides low-impedance grounding for analog signals - improving PSRR and minimizing offset drift caused by ground bounce.
MAX9919NASA/V+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Current Sense
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 3V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 120 kHz
- Current - Input Bias:
- 175 µA
- Voltage - Input Offset:
- 400 µV
- Current - Supply:
- 1mA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 4.75 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC-EP
MAX9919NASA/V+T FAQ
1.How can I place an order for MAX9919NASA/V+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX9919NASA/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 MAX9919NASA/V+T reliable?
The price and inventory of MAX9919NASA/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 MAX9919NASA/V+T is usually 5 days.
3.What payment methods are accepted for MAX9919NASA/V+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX9919NASA/V+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX9919NASA/V+T?
MAX9919NASA/V+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX9919NASA/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 MAX9919NASA/V+T?
For technical support, including MAX9919NASA/V+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX9919NASA/V+T requirements.
6.How does Aetrix verify that MAX9919NASA/V+T is sourced from the original manufacturer or authorized distributors?
All MAX9919NASA/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 MAX9919NASA/V+T meets industry standards.
7.What is the process for return or replacement of MAX9919NASA/V+T?
All MAX9919NASA/V+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX9919NASA/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 MAX9919NASA/V+T part is unused and in its original packaging.
Return procedure for MAX9919NASA/V+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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