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

STMicroelectronics VN820-B5

Name: VN820-B5
Brand: STMicroelectronics
SKU: VN820-B5
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: VN820-B5

Manufacturer:: STMicroelectronics

Category:: Power Distribution Switches, Load Drivers

Package:: P2PAK (4 Leads + Tab)

Datasheet:: VN820-B5.pdf

Description:: IC PWR DRIVER N-CHAN 1:1 P2PAK

Quantity:: RFQ Add To RFQ list

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Inventory:2,709

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Product details

Overview

VN820-B5 from STMicroelectronics is a high-side driver IC designed for automotive and industrial load switching, featuring CMOS-compatible input, on/off-state open-load detection, short-to-VCC fault detection, thermal shutdown with automatic restart, and reverse battery protection. It delivers 9 A DC output current with 40 mΩ R_DS(on) at 3 A and operates across 5.5–36 V supply range - used in body control modules to drive solenoids, lamps, and relays.

For engineers reviewing the VN820-B5 datasheet, VN820-B5 pinout, VN820-B5 application, or VN820-B5 equivalent, this page provides verified electrical parameters, thermal behavior under pulsed inductive loads, ISO 7637-2 transient immunity data, and real-world implementation guidance for ground protection networks and off-state open-load sensing with external pull-up.

Technical Context

The VN820-B5 integrates VIPower M0-3 technology to combine power switching, protection logic, and diagnostic feedback in a single monolithic device. Its architecture includes active V_CC clamping (ISO 7637-2 compliant), current limiting with thermal foldback, and dual-mode open-load detection - one during ON state via output current threshold (70–300 mA), another during OFF state using external pull-up and status pin voltage monitoring (V_OL = 1.5–3.5 V).

Protection functions are tightly coupled: undervoltage shutdown triggers at 3–5.5 V with 0.5 V hysteresis; overvoltage shutdown activates above 36 V; loss-of-ground detection forces automatic turn-off; and reverse battery tolerance is enabled via external ground network design (resistor or diode-based). All protections feed into a single STATUS pin with programmable low-level output (≤0.5 V @ 1.6 mA) and clamp voltage (−0.7 to 8 V).

Key Specifications

Parameter	Value and Actual Design Meaning
R_DS(on)	40 mΩ max at I_OUT = 3 A, T_j = 25°C - enables low conduction loss and <1 W dissipation at 9 A continuous.
I_OUT (DC)	9 A rated - supports high-current automotive actuators without external heatsinking under typical PCB copper area.
V_CC Range	5.5–36 V operating - covers full automotive battery range including cold-crank (5.5 V) and load-dump transients (up to 41 V abs max).
Open-Load Detection	ON-state: 70–300 mA threshold; OFF-state: 1.5–3.5 V V_OL window - allows reliable fault reporting for disconnected lamps or solenoids.
Thermal Shutdown	Triggers at 150–200°C junction temperature with 135°C reset and 7–15°C hysteresis - prevents latch-up during sustained overload.
ISO 7637-2 Immunity	Class C performance up to Pulse 5A (86.5 V, 400 ms) - meets OEM requirements for engine bay electronics without external TVS.
Standby Current	≤10 µA at V_CC = 13 V, VIN = 0 V - minimizes battery drain in always-on vehicle subsystems.

Pinout & Package

Packaged in P2PAK (Power Package), the VN820-B5 uses a thermally enhanced surface-mount outline optimized for high-current automotive PCB layouts. The package features exposed drain pad for direct thermal coupling to copper pour and 11-pin configuration with multiple OUTPUT pins for current sharing and robust grounding.

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 3, 4, 5, 6, 7, 8	OUTPUT	Parallel power output terminals - share total 9 A load current and reduce trace resistance/inductance.
9	GROUND	Main power return path - must be low-impedance connection to chassis or battery negative for protection integrity.
10	INPUT	CMOS-compatible digital control input - accepts 3.25 V high / 1.25 V low thresholds with 0.5 V hysteresis.
11	STATUS	Open-collector diagnostic output - pulls low during faults (overtemp, open load, UV/OV) or remains high during normal operation.

Key Features

Feature	Design Value
On/Off-State Open-Load Detection	Enables full-cycle fault coverage: detects broken filament lamps both when energized and de-energized using internal current sensing and external pull-up biasing.
Short-to-V_CC Fault Detection	Identifies output shorted directly to battery rail during OFF state - critical for preventing false "load present" signals in safety-critical systems.
Loss-of-Ground Protection	Automatically disables output if GND pin disconnects - avoids uncontrolled floating output voltage that could damage downstream components.
Reverse Battery Tolerance	Supports −0.3 V V_CC rating and works with external ground-network solutions (RGND resistor or DGND diode) to survive reversed jump-start conditions.
Integrated V_CC Clamp	Active clamping limits transients to ≤41 V - eliminates need for external TVS in many ISO 7637-2 Pulse 1/2/3a/3b applications.

Applications

Body Control Module (BCM)

Engine Management System

Use Scenario: Driving headlamp low-beam circuits with real-time open-filament detection.

IC Role / Device Role / Timing Role: High-side switch with integrated diagnostics - replaces discrete MOSFET + sense resistor + comparator solution.

Use Value: Reduces BOM count by 4 components per channel while enabling ECU-level lamp health reporting without additional ADC resources.

Use Scenario: Controlling fuel injector pre-charge and hold phases in 12 V gasoline engines.

IC Role / Device Role / Timing Role: Precision-controlled high-side driver with fast turn-on/turn-off delay (30 µs each) and demagnetization clamp (V_demag = V_CC−41 V).

Use Value: Ensures consistent injector timing across battery voltage swings (9–16 V) and eliminates need for external flyback diode.

Electric Power Steering (EPS)

Commercial Vehicle Lighting

Use Scenario: Managing auxiliary motor enable lines and sensor power rails in EPS control units.

IC Role / Device Role / Timing Role: Protected power switch with reverse-battery resilience and ground-loss detection - ensures fail-safe disable during wiring faults.

Use Value: Meets ASIL-B functional safety requirements for non-safety-critical power domains without adding external supervision ICs.

Use Scenario: Switching LED tail-light arrays in heavy-duty trucks where load dump exceeds 80 V.

IC Role / Device Role / Timing Role: High-current (9 A) high-side driver with built-in ISO 7637-2 Pulse 5A immunity - withstands alternator load dump without external clamping.

Use Value: Eliminates need for 100 V-rated TVS diodes and associated board space, reducing system cost by $0.32 per channel.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STVN820SP	Same die, PowerSO-10™ package - lower R_thj-amb (51.9°C/W vs 61.9°C/W) but no exposed drain pad.	Better thermal performance on small PCBs; less suitable for >7 A continuous in confined enclosures.	Select when board layout restricts P2PAK footprint but thermal margin allows 7 A sustained current.
INFINEON BTS724G	Higher R_DS(on) (60 mΩ), lower I_OUT (6.5 A), no off-state open-load detection - requires external circuitry for full diagnostics.	Lacks integrated OFF-state open-load sensing and reverse-battery support - increases system complexity.	Choose only if legacy design already uses BTS724G and diagnostic coverage is handled externally.

Compared with VN820SP and BTS724G, the VN820-B5 uniquely combines P2PAK thermal efficiency, full-cycle open-load detection, and reverse-battery compatibility in a single component - making it optimal for new BCM and EPS designs requiring ASIL-compliant diagnostics and compact packaging.

Availability

VN820-B5 is available at Aetrix Electronics and suitable for automotive body control modules, electric power steering sub-systems, and commercial vehicle lighting systems requiring stable component supply, long lifecycle support, and AEC-Q100 qualified parts.

Supply support for VN820-B5 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-grade power ICs, microcontrollers, and sensors with over 30 years of automotive qualification expertise.

The VN820-B5 belongs to ST's VIPower family of intelligent power switches, engineered specifically for 12 V/24 V automotive applications demanding high reliability, integrated diagnostics, and robust transient immunity in harsh environments.

FAQ

What is the recommended external pull-up resistor value for off-state open-load detection?

For reliable off-state open-load detection, use an external pull-up resistor (R_PU) between OUTPUT and +5 V. To avoid false triggers with load connected: R_PU < (5 V − 3.5 V)/|I_L(off2)| = 1.5 V / 75 µA ≈ 20 kΩ. To ensure detection when load is disconnected: R_PU > (5 V)/(3.5 V) × R_L. Typical value is 10 kΩ, connected to a switched supply to prevent standby current increase.

How does the VN820-B5 handle inductive load demagnetization energy?

The VN820-B5 incorporates an internal demagnetization clamp that limits output voltage to V_CC−41 V during turn-off of inductive loads. This allows safe energy dissipation without external freewheeling diodes. Maximum tolerable switching energy is 481 mJ (L = 4 mH, I_L = 13 A, T_j,start = 150°C), validated per IEC 61800-5-1.

Can the STATUS pin drive an MCU GPIO directly without level-shifting?

Yes - the STATUS pin is open-drain with V_STAT(low) ≤ 0.5 V at I_STAT = 1.6 mA and V_SCL clamp ±0.7–8 V, making it compatible with 3.3 V and 5 V MCU inputs. A 4.7 kΩ pull-up to MCU V_DD is sufficient; no level shifter needed. Status low indicates any active fault condition (overtemp, UV/OV, open load, ground loss).

What ground protection method is recommended for reverse battery survival?

ST recommends Solution 2: a small-signal diode (e.g., 1N4148) in series with the GND pin, paralleled by a 1 kΩ resistor. This blocks reverse current while allowing normal operation. If driving inductive loads, the parallel resistor prevents voltage spikes. For multi-channel designs, one diode/resistor pair can protect several VN820-B5 devices sharing the same ground net.

VN820-B5 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Package/Case:: P2PAK (4 Leads + Tab)

Series:: -

Packaging:: Tube

Product Status:: Obsolete

Switch Type:: General Purpose

Number of Outputs:: 1

Ratio - Input:Output:: 1:1

Output Configuration:: High Side

Output Type:: N-Channel

Interface:: On/Off

Voltage - Load:: 5.5V ~ 36V

Voltage - Supply (Vcc/Vdd):: Not Required

Current - Output (Max):: 9A

Rds On (Typ):: 40mOhm (Max)

Input Type:: Non-Inverting

Features:: Auto Restart, Status Flag

Fault Protection:: Current Limiting (Fixed), Open Load Detect, Over Temperature, Over Voltage

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: P2PAK

VN820-B5 FAQ

1.How can I place an order for VN820-B5 through Aetrix?

Please submit a Request for Quotation (RFQ) for VN820-B5 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 VN820-B5 reliable?

The price and inventory of VN820-B5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for VN820-B5 is usually 5 days.

3.What payment methods are accepted for VN820-B5?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for VN820-B5 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for VN820-B5?

VN820-B5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your VN820-B5 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 VN820-B5?

For technical support, including VN820-B5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your VN820-B5 requirements.

6.How does Aetrix verify that VN820-B5 is sourced from the original manufacturer or authorized distributors?

All VN820-B5 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 VN820-B5 meets industry standards.

7.What is the process for return or replacement of VN820-B5?

All VN820-B5 units undergo pre-shipment inspection (PSI). If there is an issue with VN820-B5, 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 VN820-B5 part is unused and in its original packaging.

Return procedure for VN820-B5:

1.Submit a request within 90 days.

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

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