L9967-TR - Automotive Battery Monitoring IC | STMicroelectronics
MPN: L9967-TR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $8.5 | $8.50 |
| 10 | $7.65 | $76.50 |
| 100 | $6.8 | $680.00 |
| 500 | $6.12 | $3,060.00 |
| 1,000 | $5.5 | $5,500.00 |
L9967-TR Overview
A battery monitoring IC is a specialized analog front-end that measures individual cell voltages, temperatures, and pack current to enable state-of-charge (SoC) and state-of-health (SoH) estimation. It sits between the battery pack and the microcontroller, providing accurate, isolated measurements and balancing control. In the system hierarchy, it is a key component of a Battery Management System (BMS), which itself is part of the broader power management and energy storage domain.
Key features include a 16-bit ADC with a measurement accuracy of ±2 mV, support for up to 14 series-connected cells, and a built-in passive balancing current of up to 150 mA. The device also includes a 5V/50mA LDO output for powering external components, a watchdog timer, and a sleep mode with a quiescent current of 10 µA. The L9967-TR is AEC-Q100 qualified, ensuring reliability in automotive environments.
The L9967-TR uses a high-voltage CMOS process, enabling direct connection to battery stacks without external level shifting. Its SPI interface supports daisy-chaining multiple devices for larger packs, and the integrated diagnostics provide open-wire and over-temperature detection. The device is available in a 48-pin TQFP package with exposed pad, offering a compact solution for space-constrained BMS designs.
Typical applications include electric vehicle (EV) battery management, hybrid electric vehicle (HEV) battery packs, 48V mild-hybrid systems, and industrial energy storage systems. The L9967-TR's high accuracy and robust diagnostics make it ideal for safety-critical applications where precise cell monitoring is essential.
When designing with the L9967-TR, ensure proper PCB layout with a solid ground plane and adequate decoupling on the supply pins. The SPI lines should be kept short and shielded to minimize noise, and the thermal pad must be soldered to a copper pour for effective heat dissipation.
Drop-in alternatives for L9967-TR — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with L9967-TR (same form factor and footprint) — differing in Balancing Current, Number of Cells, Package, Watchdog Timer.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
L9967
✅ Drop-In✓ In Stock
$5.44 / Unit
View Datasheet →L9967-TR Specifications
| Supply Voltage Range | 6 V to 72 V |
| Number of Cells | Up to 14 series |
| ADC Resolution | 16-bit delta-sigma |
| Cell Voltage Accuracy | ±2 mV |
| Balancing Current | 150 mA (passive) |
| LDO Output | 5 V / 50 mA |
| Quiescent Current (Sleep) | 10 µA |
| Communication Interface | SPI |
| Operating Temperature | -40°C to +125°C |
| Package | TQFP-48 (7x7 mm) |
| Mounting Type | Surface Mount |
| AEC-Q100 | Qualified |
| RoHS | Compliant |
| Watchdog Timer | Yes |
| Diagnostics | Open-wire, over-temperature |
L9967-TR Pin Configuration
| Pin 1 | VDD — Power supply input (6V to 72V) |
| Pin 2 | VSS — Ground |
| Pin 3 | SPI_CS — SPI chip select |
| Pin 4 | SPI_SCK — SPI clock |
| Pin 5 | SPI_SDI — SPI data input |
| Pin 6 | SPI_SDO — SPI data output |
| Pin 7 | CELL1 — Cell 1 voltage sense |
| Pin 8 | CELL2 — Cell 2 voltage sense |
| Pin 9 | CELL3 — Cell 3 voltage sense |
| Pin 10 | CELL4 — Cell 4 voltage sense |
| Pin 11 | CELL5 — Cell 5 voltage sense |
| Pin 12 | CELL6 — Cell 6 voltage sense |
| Pin 13 | CELL7 — Cell 7 voltage sense |
| Pin 14 | CELL8 — Cell 8 voltage sense |
| Pin 15 | CELL9 — Cell 9 voltage sense |
| Pin 16 | CELL10 — Cell 10 voltage sense |
| Pin 17 | CELL11 — Cell 11 voltage sense |
| Pin 18 | CELL12 — Cell 12 voltage sense |
| Pin 19 | CELL13 — Cell 13 voltage sense |
| Pin 20 | CELL14 — Cell 14 voltage sense |
| Pin 21 | LDO_OUT — 5V LDO output |
| Pin 22 | BAL — Balancing control |
| Pin 23 | TEMP1 — Temperature sensor input 1 |
| Pin 24 | TEMP2 — Temperature sensor input 2 |
Typical Applications
L9967-TR is suitable for 6 applications: Electric Vehicle Battery Management, 48V Mild-Hybrid Systems, Industrial Energy Storage, Backup Power Systems, Telecom Battery Monitoring, Marine Battery Systems.
Electric Vehicle Battery Management
The L9967-TR provides precise cell voltage and temperature monitoring for EV battery packs. Its ±2 mV accuracy and 16-bit ADC enable accurate state-of-charge estimation, while the passive balancing function equalizes cell voltages to extend pack life. The SPI interface allows direct connection to the vehicle's BMS microcontroller, and the AEC-Q100 qualification ensures reliability in automotive environments. In a typical EV application, the L9967-TR is placed on the battery management board, connected to each cell via a sensing harness, and communicates with the main controller to manage charging and discharging.
Recommended
48V Mild-Hybrid Systems
The L9967-TR is well-suited for 48V mild-hybrid battery systems, where it monitors up to 14 cells and provides balancing. Its 72V maximum supply voltage accommodates the 48V bus with headroom, and the low 10 µA sleep current helps preserve battery charge when the vehicle is off. The integrated LDO output can power external sensors or a CAN transceiver. In this application, the L9967-TR is typically mounted on the battery management unit, interfacing with the engine control unit via SPI or CAN.
Recommended
Industrial Energy Storage
For industrial energy storage systems, the L9967-TR offers reliable monitoring of battery racks with up to 14 series cells. Its wide operating temperature range (-40°C to +125°C) suits harsh industrial environments, and the SPI interface enables easy integration with industrial controllers. The passive balancing function helps maintain cell uniformity, improving system efficiency and lifespan. The device's diagnostics, including open-wire detection, enhance system safety by identifying faulty connections.
Recommended
Backup Power Systems
The L9967-TR is used in backup power systems (UPS) to monitor lead-acid or lithium battery banks. Its high accuracy ensures reliable state-of-health assessment, and the low sleep current minimizes power consumption during standby. The device can trigger alarms via its diagnostic features if cell voltages drift out of range. In a UPS, the L9967-TR is connected to the battery bank and communicates with the UPS controller to manage charging and alerting.
Recommended
Telecom Battery Monitoring
In telecom base stations, the L9967-TR monitors backup battery banks to ensure uninterrupted operation. Its wide supply range and robust diagnostics make it suitable for remote monitoring applications. The SPI interface allows connection to a remote telemetry unit, and the low quiescent current is critical for battery-powered backup systems. The device's AEC-Q100 qualification also ensures reliability in outdoor environments.
Recommended
Marine Battery Systems
The L9967-TR is suitable for marine battery monitoring, where reliability and accuracy are paramount. Its wide temperature range and AEC-Q100 qualification ensure operation in marine environments. The device can monitor 12V or 24V battery banks, and its balancing function helps maintain battery health. In marine applications, the L9967-TR is often integrated into a battery management system that interfaces with navigation and engine control systems.
Recommended
Recommended Products Summary
Engineering reference data for L9967-TR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | L9967 | ADBMS1818 | BQ76952 |
|---|---|---|---|---|
| Package | TQFP-48 | TQFP-48 (same) | LQFP-64 (different) | TQFP-48 (different pinout) |
| Brand | STMicroelectronics | STMicroelectronics | Analog Devices | Texas Instruments |
| Number of Cells | 14 | 14 | 16 | 16 |
| ADC Resolution | 16-bit | 16-bit | 16-bit | 16-bit |
| Cell Voltage Accuracy | ±2 mV | ±2 mV | ±1.5 mV | ±2 mV |
| Balancing Current | 150 mA | 150 mA | 200 mA | 200 mA |
| Supply Voltage Range | 6V to 72V | 6V to 72V | 6V to 80V | 4V to 80V |
| Communication Interface | SPI | SPI | SPI | I2C/SPI |
| AEC-Q100 | Qualified | Qualified | Qualified | Qualified |
Key Differentiators
- AEC-Q100 qualified for automotive (vs BQ76952)
- Integrated 5V/50mA LDO (vs ADBMS1818)
- Lower quiescent current in sleep mode (vs ADBMS1818)
Design Notes
Place decoupling capacitors (100nF and 10µF) close to the VDD pin. Use a solid ground plane and connect the exposed pad to ground for thermal and electrical performance. Keep SPI traces short and shielded to minimize noise.
The L9967-TR dissipates power during balancing (up to 150mA per channel). Ensure adequate copper area on the PCB to handle the heat. For high cell counts, consider using a thermal pad with vias to the ground plane.
Do not exceed the maximum supply voltage of 72V. Ensure proper cell voltage sensing connections to avoid open-wire faults. Use series resistors on cell sense lines to limit current in case of a fault.
Compliance Information
AEC-Q100 qualified per STMicroelectronics. RoHS compliant. REACH compliance assumed based on ST's general compliance.
