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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Power Distribution Switches, Load Drivers

STMicroelectronics L9825TR

Name: L9825TR
Brand: STMicroelectronics
SKU: L9825TR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: L9825TR

Manufacturer:: STMicroelectronics

Category:: Power Distribution Switches, Load Drivers

Package:: 20-SOIC (0.433", 11.00mm Width) Exposed Pad

Datasheet:: L9825TR.pdf

Description:: IC PWR DRIVER N-CHAN 1:8 PWRSO20

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Product details

Overview

L9825TR from STMicroelectronics is an octal low-side driver IC designed for automotive resistive and inductive load control. It delivers up to 2.05 A per output (Out1–Out6), features intrinsic 50 V voltage clamping, SPI + parallel control (NON1/NON2), and integrated diagnostics including open-load and overcurrent detection. Used in body control modules for headlamp, fog lamp, and relay driving.

For engineers reviewing the L9825TR datasheet, L9825TR pinout, L9825TR application, or L9825TR equivalent, key selection criteria include its dual-control mode (SPI/parallel), thermal shutdown behavior on Out7/Out8, diagnostic current sink (60 µA typical), and PowerSO-20 package compatibility with automotive PCB layouts.

Technical Context

The L9825TR integrates eight independent low-side power switches with separate protection logic per output group: Out1–Out6 use immediate overcurrent shutdown (1.4 A typ.), while Out7/Out8 employ current-limiting + thermal shutdown (1.4 A typ., 165 °C threshold). Its SPI interface supports 3 MHz clock rate with NCS-synchronized 8-bit shift register and status readback via SDO.

Parallel control inputs NON1/NON2 directly drive Out1/Out2 with internal pull-up resistors and PWM-capable timing (tdon1 = 5 µs, dUon2/dt = 2–10 V/µs). Diagnostic thresholds are set at 0.38·VCC, with dedicated fault latches for Out1/Out2 cleared only on NCS low, requiring two consecutive reads for accurate fault capture.

Key Specifications

Parameter	Value and Actual Design Meaning
Output count	8 independent low-side drivers with grouped protection logic
Max output current	2.05 A (Out1–Out6); 1.75 A (Out7/Out8) - defines load-driving capability under short-circuit conditions
Output clamp voltage	Typ. 50 V - enables safe flyback energy recirculation for inductive loads like solenoids and relays
R_DS(on)	≤ 0.75 Ω at T_J = 25°C - ensures <1.5 W conduction loss at 1.5 A, critical for thermal management in PowerSO-20
SPI clock frequency	3 MHz max - supports fast configuration updates and diagnostic polling in real-time vehicle networks
Diagnostic sink current	60 µA typical - provides reliable open-load detection across 16–25 V battery range without external components
Thermal shutdown	165 °C junction threshold - protects Out7/Out8 during lamp inrush while allowing sustained operation of other outputs

Pinout & Package

Package: PowerSO-20 (JEDEC MO-166), thermally enhanced surface-mount package with exposed slug for direct PCB heat sinking. Dimensions: 15.8 × 14.5 × 3.6 mm, weight 1.9 g.

Pin/Terminal	Circuit Role	Design Meaning
GND (Pins 1,10,11,20)	Device ground reference	Four dedicated ground pins minimize ground bounce and improve EMI immunity in noisy automotive environments
NON1 / NON2 (Pins 2,12)	Parallel control inputs for Out1/Out2	Enable standalone PWM control independent of SPI; internal 50–250 kΩ pull-up ensures fail-safe OFF state
SDI / SDO / CLK / NCS (Pins 8,3,9,19)	SPI interface signals	Full-duplex serial control: NCS synchronizes 8-bit data latch; SDO returns real-time output status bits
nRES (Pin 18)	Asynchronous reset input	Active-low signal that clears all output latches and fault registers; OR'd with internal undervoltage detector
VCC (Pin 13)	Supply voltage input	4.5–5.5 V operation; supports automotive battery transients per ISO 7637-2 and DIN 40839
OUT1–OUT8 (Pins 4,14,5,15,6,16,7,17)	Power output terminals	Low-side switch outputs rated for 45 V continuous, 50 V clamped; each drives external loads to GND

Key Features

Feature	Design Value
Dual-mode control	Out1/Out2 support both SPI and direct NON1/NON2 inputs - enables hybrid architectures combining centralized bus control with local fast-response PWM
Grouped protection strategy	Out1–Out6: hard overcurrent shutdown; Out7/Out8: current limiting + thermal shutdown - matches lamp vs. solenoid load profiles
Integrated diagnostics	Per-output open-load and short-to-battery detection with filtered status reporting via SPI - eliminates need for external sense resistors or comparators
Flyback energy handling	50 V intrinsic clamp with 20 mJ energy rating - safely absorbs inductive kickback from 600 mH coils without external TVS diodes
Automotive-grade transient immunity	Validated against ISO 7637-3 Pulse 1/2a/3a/3b and DIN 40839 - operates reliably in 12 V vehicle electrical systems with load dump and jump-start events

Applications

Headlamp Control Module

Fog Lamp Driver

Use Scenario: Driving high-intensity discharge (HID) or LED headlamps with PWM dimming and fault monitoring.

IC Role / Device Role / Timing Role: Low-side switch controlling lamp current path; NON1/NON2 enable fast PWM dimming while SPI handles configuration and diagnostics.

Use Value: 2.05 A output rating supports 55 W halogen lamps; 50 V clamp prevents damage from inductive kickback during rapid turn-off.

Use Scenario: Controlling 35 W fog lamps subject to high inrush current and vibration-induced contact faults.

IC Role / Device Role / Timing Role: Low-side driver with current-limiting (Out7/Out8) and open-load detection for lamp filament integrity verification.

Use Value: Thermal shutdown at 165 °C allows safe inrush handling; 60 µA diagnostic sink detects broken filaments without added circuitry.

Body Control Unit Relay Driver

Heated Rear Window Controller

Use Scenario: Replacing electromechanical relays in door lock, mirror fold, and trunk release circuits.

IC Role / Device Role / Timing Role: Octal low-side driver replacing discrete MOSFETs + gate drivers; SPI enables centralized BCU firmware control.

Use Value: R_DS(on) ≤ 0.75 Ω reduces board space and heat generation vs. discrete solutions; 8-channel integration cuts BOM count by >70%.

Use Scenario: Driving resistive heating elements (≈1 Ω) on rear windows with overtemperature and open-circuit protection.

IC Role / Device Role / Timing Role: High-current low-side switch with overcurrent shutdown (Out1–Out6) and real-time status feedback via SDO.

Use Value: 2.05 A rating supports 12 V/20 A heating elements; diagnostic bit reporting enables automatic deactivation on element breakage.

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal low-side driver applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TLE6232GP	6-channel, higher R_DS(on) (1.2 Ω), no parallel control inputs, integrated watchdog	Lacks dual-mode control and Out7/Out8 current-limiting; suited for simpler 6-output nodes	Select when system requires built-in watchdog and lower channel count suffices
BD8960AEFJ-M	8-channel, 1.5 A max, no voltage clamping, SPI-only control, smaller HTSOP-J8 package	No intrinsic flyback protection; requires external clamp diodes; unsuitable for inductive loads without redesign	Select for space-constrained non-inductive applications where clamping is handled externally

Compared with TLE6232GP and BD8960AEFJ-M, the L9825TR uniquely combines octal channel count, dual-control mode, 50 V clamping, and grouped protection-making it optimal for automotive body electronics requiring mixed load types and diagnostic depth.

Availability

L9825TR is available at Aetrix Electronics and suitable for automotive body control units, lighting modules, and heated component drivers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for L9825TR 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in automotive, industrial, and power management ICs with broad AEC-Q100 qualification coverage.

The L9825TR belongs to ST's automotive power driver product line, engineered specifically for intelligent load switching in 12 V vehicle networks-emphasizing robustness, integrated diagnostics, and compliance with ISO 16750 and ISO 7637 standards.

FAQ

What is the function of the nRES pin on the L9825TR?

The nRES pin is an asynchronous active-low reset input that clears all output latches and fault registers. It is logically OR'd with an internal undervoltage detection circuit monitoring VCC; either condition triggers a full device reset, ensuring safe default-OFF behavior during power brownouts or cold cranking events in automotive systems.

How does the L9825TR handle inductive load flyback energy?

The L9825TR incorporates intrinsic voltage clamping at ~50 V across all outputs, enabling flyback current from inductive loads (e.g., relays, solenoids) to recirculate safely within the chip. This eliminates the need for external flyback diodes or TVS devices and is rated for up to 20 mJ of clamp energy per output, validated for 600 mH loads per application note.

Can outputs 7 and 8 be used for PWM control like outputs 1 and 2?

No-only outputs 1 and 2 support direct parallel control via NON1/NON2 pins for hardware-level PWM. Outputs 3–8 are SPI-only controlled; their turn-on/turn-off timing (tdon2 = 10 µs, tdoff = 10 µs) supports moderate-speed modulation but lacks the sub-µs edge control and independent gating of NON1/NON2, making them unsuitable for high-frequency PWM dimming.

What diagnostic data can be read back via the SPI interface?

The SPI interface returns an 8-bit status register via SDO, where each bit reflects the real-time diagnostic state of one output: '0' indicates fault (open-load or short-to-battery), '1' indicates normal operation. For outputs 1 and 2, the latch stores the first fault occurrence and requires two consecutive reads for accurate status due to digital filtering; outputs 3–8 report raw, unfiltered status.

L9825TR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Package/Case:: 20-SOIC (0.433", 11.00mm Width) Exposed Pad

Series:: -

Packaging:: Tape & Reel (TR)

Product Status:: Active

Switch Type:: Latched Driver

Number of Outputs:: 8

Ratio - Input:Output:: 1:8

Output Configuration:: Low Side

Output Type:: N-Channel

Interface:: SPI

Voltage - Load:: 45V (Max)

Voltage - Supply (Vcc/Vdd):: 4.5V ~ 5.5V

Current - Output (Max):: 1A

Rds On (Typ):: 750mOhm (Max)

Input Type:: -

Features:: Status Flag

Fault Protection:: Current Limiting (Fixed), Over Temperature

Operating Temperature:: -40°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: PowerSO-20

L9825TR FAQ

1.How can I place an order for L9825TR through Aetrix?

Please submit a Request for Quotation (RFQ) for L9825TR 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 L9825TR reliable?

The price and inventory of L9825TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L9825TR is usually 5 days.

3.What payment methods are accepted for L9825TR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L9825TR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for L9825TR?

L9825TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your L9825TR 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 L9825TR?

For technical support, including L9825TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L9825TR requirements.

6.How does Aetrix verify that L9825TR is sourced from the original manufacturer or authorized distributors?

All L9825TR 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 L9825TR meets industry standards.

7.What is the process for return or replacement of L9825TR?

All L9825TR units undergo pre-shipment inspection (PSI). If there is an issue with L9825TR, 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 L9825TR part is unused and in its original packaging.

Return procedure for L9825TR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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