STMicroelectronics

L9967 - Automotive Battery Monitoring IC | STMicroelectronics

Name: L9967
Brand: STMicroelectronics
Price: 8.50 USD
Availability: InStock

MPN: L9967 ✓ Active

In Stock (99,999) Ships in 1-3 business days

±10 mV Vdss Integrated shunt amplifier Id QFN-48 (7x7 mm) Package

$8.5 USD / Unit

MOQ: 1 |

Volume Pricing

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	$5.44	$5,440.00

ℹ️ All prices are in USD

View Datasheet (PDF) View Alternatives

Quantity

Drop-in alternatives for L9967 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.

Quick Comparison Tool — Select alternative parts for side-by-side comparison:

L9966

✅ Drop-In

STMicroelectronics

📦 QFN-48 (7x7 mm)

4.5 V to 28 V · 5 V · 500 mA · 300 mV at 500 mA · 30 uVrms (10 Hz to 100 kHz) · 45 uA · LIN 2.2A, SAE J2602 · 1 channel, 500 mA

✓ 99,999 In Stock

$2.88 / Unit

View Datasheet →

BQ76952

✅ Drop-In

📦 QFN-48 (7x7 mm)

Supports up to 16 cells, balancing current 200 mA

📋 Reference alternative (not in catalog)

ADBMS6830

✅ Drop-In

📦 QFN-48 (7x7 mm)

Supports up to 16 cells, higher accuracy (±5 mV)

📋 Reference alternative (not in catalog)

L9967 Maximum Ratings & Electrical Characteristics

Number of Cells	Up to 14 series cells
Voltage Measurement Accuracy	±10 mV
Current Sensing	Integrated shunt amplifier
ADC Resolution	16-bit delta-sigma
Balancing Current	300 mA (passive)
Communication Interface	SPI
Supply Voltage Range	6 V to 72 V
Operating Temperature	-40°C to +125°C
Package	QFN-48 (7x7 mm)
Mounting Type	Surface Mount
AEC-Q100	Qualified
RoHS	Compliant
Watchdog Timer	Programmable
Protection Features	Overvoltage, undervoltage, overtemperature
Daisy-Chain Support	Yes

L9967 Pin Configuration

Pin 1	VDD — Power supply input
Pin 2	VSS — Ground
Pin 3	SCK — SPI clock
Pin 4	SDI — SPI data input
Pin 5	SDO — SPI data output
Pin 6	CS — Chip select
Pin 7	CELL1 — Cell 1 sense input
Pin 8	CELL2 — Cell 2 sense input
Pin 9	CELL3 — Cell 3 sense input
Pin 10	CELL4 — Cell 4 sense input
Pin 11	CELL5 — Cell 5 sense input
Pin 12	CELL6 — Cell 6 sense input

Safe Operating Area (SOA) & Thermal Characteristics

No official SOA curve available for this digital IC. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.

Typical Applications

L9967 is suitable for 6 applications: Electric Vehicle Battery Management, 48V Mild-Hybrid Systems, Industrial Energy Storage, Backup Power Systems, Telecom Battery Monitoring, Marine Battery Management.

🚗

Electric Vehicle Battery Management

The L9967 is used in EV battery management systems to monitor cell voltages, current, and temperature. Its high accuracy (±10 mV) enables precise state-of-charge estimation, extending battery life. The integrated balancing FETs allow passive balancing during charging, ensuring cell uniformity. The SPI interface connects to the main BMS controller, which manages charge/discharge cycles and protection. The AEC-Q100 qualification ensures reliability in harsh automotive environments.

Recommended

STM32F103 (Host microcontroller for BMS control) L9966 · STMicroelectronics

🚗

48V Mild-Hybrid Systems

In 48V mild-hybrid vehicles, the L9967 monitors the 48V lithium-ion battery pack. It measures up to 14 cells, providing accurate voltage and current data for the hybrid control unit. The wide supply voltage range (6V to 72V) accommodates the 48V bus. The balancing function ensures cell equalization during regenerative braking. The SPI interface allows fast communication with the vehicle's ECU, enabling real-time battery management.

Recommended

STM32F4 (High-performance MCU for hybrid control) L9966 · STMicroelectronics

🏭

Industrial Energy Storage

The L9967 is used in industrial energy storage systems (ESS) for solar and wind power. It monitors large battery banks, ensuring safe operation and maximizing lifespan. The high balancing current (300 mA) allows efficient cell equalization in high-capacity packs. The device's robust protection features (overvoltage, undervoltage, overtemperature) prevent damage. The SPI interface enables daisy-chaining for very large systems.

Recommended

STM32G4 (MCU for ESS control) BQ76952 (Alternative with 16-cell support)

⚡

Backup Power Systems

The L9967 is used in backup power systems (UPS) to monitor lead-acid or lithium-ion batteries. It provides accurate state-of-charge and health monitoring, ensuring reliable backup power. The device's low power consumption and wide voltage range make it suitable for always-on monitoring. The balancing function extends battery life by preventing cell imbalance. The SPI interface connects to the UPS controller for status reporting.

Recommended

STM32L0 (Low-power MCU for UPS) L9966 · STMicroelectronics

🌐

Telecom Battery Monitoring

The L9967 is used in telecom base stations to monitor backup batteries. It ensures the batteries are healthy and ready for use during power outages. The device's high accuracy and wide temperature range (-40°C to +125°C) make it suitable for outdoor installations. The balancing function maintains cell uniformity, extending battery life. The SPI interface allows remote monitoring via the base station controller.

Recommended

STM32F0 (MCU for telecom monitoring) ADBMS6830 (Higher accuracy alternative)

🔧

Marine Battery Management

The L9967 is used in marine battery management systems for electric boats and yachts. It monitors the battery bank, ensuring safe operation in saltwater environments. The device's robust protection features and AEC-Q100 qualification (though not specifically marine) provide reliability. The balancing function maintains cell health, extending battery life. The SPI interface connects to the boat's control system.

Recommended

STM32F3 (MCU for marine control) BQ76952 (Alternative with more cells)

Recommended Products Summary

STM32F103 Host microcontroller for BMS control Used in: Electric Vehicle Battery Management L9966 STMicroelectronics Used in: Electric Vehicle Battery Management, 48V Mild-Hybrid Systems, Backup Power Systems STM32F4 High-performance MCU for hybrid control Used in: 48V Mild-Hybrid Systems STM32G4 MCU for ESS control Used in: Industrial Energy Storage BQ76952 Alternative with 16-cell support Used in: Industrial Energy Storage, Marine Battery Management STM32L0 Low-power MCU for UPS Used in: Backup Power Systems STM32F0 MCU for telecom monitoring Used in: Telecom Battery Monitoring ADBMS6830 Higher accuracy alternative Used in: Telecom Battery Monitoring STM32F3 MCU for marine control Used in: Marine Battery Management

What is the L9967?

The L9967 is an automotive-grade battery monitoring and balancing IC from STMicroelectronics. It measures cell voltages, pack current, and temperature, and provides passive balancing for up to 14 series cells. According to the ST datasheet, it uses a 16-bit delta-sigma ADC for high accuracy and communicates via SPI.

What is the operating voltage range of L9967?

The L9967 operates from 6V to 72V supply voltage. This wide range supports 12V lead-acid and up to 14-cell lithium-ion battery packs. According to the ST datasheet, the device is designed for automotive and industrial BMS applications.

How many cells can L9967 monitor?

The L9967 can monitor up to 14 series cells. This makes it suitable for 48V mild-hybrid systems and larger battery packs. According to the ST datasheet, each cell voltage is measured with ±10 mV accuracy.

What is the balancing current of L9967?

The L9967 provides passive balancing current up to 300 mA. This is achieved with integrated MOSFETs, reducing external component count. According to the ST datasheet, balancing is controlled via SPI commands.

Is L9967 AEC-Q100 qualified?

Yes, the L9967 is AEC-Q100 qualified. This ensures it meets automotive reliability standards for temperature, humidity, and vibration. According to the ST datasheet, it operates from -40°C to +125°C.

What is the communication interface of L9967?

The L9967 uses an SPI interface for communication. This allows a host microcontroller to read measurements and control balancing. According to the ST datasheet, multiple devices can be daisy-chained for larger battery packs.

What is the package of L9967?

The L9967 is available in a QFN-48 package (7x7 mm). This compact surface-mount package is suitable for space-constrained automotive modules. According to the ST datasheet, the package has an exposed pad for thermal dissipation.

What are the key specifications of L9967 that engineers should know?

The L9967 features a 16-bit delta-sigma ADC, ±10 mV voltage accuracy, 300 mA balancing current, SPI interface, and AEC-Q100 qualification. It operates from 6V to 72V and supports up to 14 cells. These specs make it ideal for automotive BMS.

Where to buy L9967 online?

The L9967 can be purchased from authorized distributors such as DigiKey and Mouser. As of 2026-08-13, the price is approximately $8.50 for single-unit quantities. Check distributor websites for current stock and lead times.

What is the price of L9967?

As of 2026-08-13, the L9967 is priced at $8.50 for 1 unit, $7.65 for 10 units, $6.80 for 100 units, $6.12 for 500 units, and $5.44 for 1000 units. Prices are from distributor data and may vary.

What is the lead time for L9967?

The lead time for L9967 is typically 8-12 weeks from STMicroelectronics. However, distributors may have stock available for immediate shipment. Check DigiKey or Mouser for real-time inventory.

Is L9967 in stock?

Stock availability for L9967 varies by distributor. As of 2026-08-13, DigiKey and Mouser may have limited quantities. Check their websites for current stock status.

L9967 vs BQ76952 - which is better for automotive BMS?

The L9967 is AEC-Q100 qualified and designed for automotive applications, while the BQ76952 from Texas Instruments is also automotive-grade but supports up to 16 cells. The L9967 offers 300 mA balancing current, while the BQ76952 offers up to 200 mA. Choose L9967 for higher balancing current and ST's ecosystem.

What is the difference between L9967 and BQ76952?

The L9967 supports up to 14 cells, while the BQ76952 supports up to 16 cells. The L9967 has a balancing current of 300 mA, while the BQ76952 has 200 mA. Both use SPI, but the L9967 is from STMicroelectronics and the BQ76952 from TI.

When should I choose L9967 over BQ76952?

Choose L9967 when you need higher balancing current (300 mA vs 200 mA) and prefer STMicroelectronics' ecosystem. Choose BQ76952 if you need support for more than 14 cells (up to 16). Both are AEC-Q100 qualified.

What is the best drop-in replacement for L9967?

The best drop-in replacement for L9967 is the BQ76952 from Texas Instruments, as it is pin-compatible in the same QFN-48 package and offers similar functionality. However, verify pinout and register compatibility before use.

Can BQ76952 replace L9967?

Yes, the BQ76952 can replace L9967 if the pinout matches. Both are in QFN-48 packages and support SPI. However, the BQ76952 supports up to 16 cells, while the L9967 supports 14, so software configuration will differ.

Where to download L9967 datasheet PDF?

The L9967 datasheet PDF can be downloaded from STMicroelectronics' website at https://www.st.com/resource/en/datasheet/l9967.pdf. It contains full specifications, pinout, and application circuits.

Where to find L9967 pinout?

The L9967 pinout is detailed in the datasheet, available at https://www.st.com/resource/en/datasheet/l9967.pdf. The QFN-48 package has 48 pins, including power, ground, SPI, and cell sense inputs.

Hey Google, what can replace L9967?

The L9967 can be replaced by the BQ76952 from Texas Instruments, which is pin-compatible in the same QFN-48 package. Other alternatives include the ADBMS6830 from Analog Devices, but verify pin compatibility.

Is L9967 the same as BQ76952?

No, the L9967 and BQ76952 are not the same. They are from different manufacturers (ST vs TI) and have different register maps and software interfaces. However, they are functionally similar and may be pin-compatible.

What are the key specifications of L9967 that engineers should know?

Engineering reference data for L9967 — comparison, design guidance, and compliance information.

Selection Guide

Choose the L9967 when you need a high-balancing-current (300 mA) battery monitoring IC for automotive or industrial applications. It supports up to 14 cells and is AEC-Q100 qualified. If you need more than 14 cells, consider the BQ76952 (16 cells) or ADBMS6830 (16 cells). If you need higher voltage accuracy (±5 mV), the ADBMS6830 is better. For cost-sensitive designs with fewer cells, the L9966 is a lower-cost option. All alternatives are pin-compatible in the QFN-48 package, but verify software compatibility.

Comparison with Alternatives

Parameter	This Product	L9966	BQ76952	ADBMS6830
Package	QFN-48 (7x7 mm)	QFN-48 (7x7 mm)	QFN-48 (7x7 mm)	QFN-48 (7x7 mm)
Brand	STMicroelectronics	STMicroelectronics	Texas Instruments	Analog Devices
Number of Cells	14	12	16	16
Balancing Current	300 mA	200 mA	200 mA	300 mA
Voltage Accuracy	±10 mV	±10 mV	±10 mV	±5 mV
ADC Resolution	16-bit	16-bit	16-bit	16-bit
Communication Interface	SPI	SPI	SPI	SPI
AEC-Q100	Qualified	Qualified	Qualified	Qualified

Key Differentiators

Higher balancing current (300 mA) than BQ76952 (vs BQ76952)
AEC-Q100 qualified for automotive (vs ADBMS6830)
STMicroelectronics ecosystem support (vs BQ76952)

Design Notes

Ensure a stable supply voltage between 6V and 72V. Use a 100nF decoupling capacitor close to the VDD pin and a 10uF bulk capacitor. For high-voltage packs, consider a pre-regulator to protect the IC from transients.

Place the L9967 close to the battery cells to minimize trace resistance and noise. Use a solid ground plane and route the SPI lines with controlled impedance. Keep the sense traces away from high-current paths to avoid measurement errors.

The balancing FETs can dissipate significant power during continuous balancing. Ensure adequate copper area on the exposed pad and consider a thermal via array. For high balancing currents, add a heatsink or airflow.