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Home > Products > Circuit Protection > Transient Voltage Suppressors (TVS) > TVS Diodes

Taiwan Semiconductor Corporation SMB10J28AH

Name: SMB10J28AH
Brand: Taiwan Semiconductor Corporation
SKU: SMB10J28AH
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SMB10J28AH

Manufacturer:: Taiwan Semiconductor Corporation

Category:: TVS Diodes

Package:: DO-214AA, SMB

Datasheet:: SMB10J28AH.pdf

Description:: TVS DIODE 28VWM 45.4VC DO214AA

Quantity:: RFQ Add To RFQ list

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Product details

Overview

SMB10J28AH from Taiwan Semiconductor is a unidirectional 1000W transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, with 28V stand-off voltage (V_WM), 31.1–34.4V breakdown voltage (V_BR), and 45.4V clamping voltage (V_C) at 22.0A peak pulse current - designed for automotive ESD and load-dump protection in lighting control and powertrain modules.

For engineers reviewing the SMB10J28AH datasheet, SMB10J28AH pinout, SMB10J28AH application, or SMB10J28AH equivalent, key selection criteria include AEC-Q101 qualification, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, 1.0ps response time, glass-passivated junction, and DO-214AA thermal performance (R_θJA = 100°C/W).

Technical Context

This unidirectional TVS diode operates as a voltage-clamped shunt protector, triggered when reverse transients exceed V_BR (31.1–34.4V), clamping to ≤45.4V at 22.0A (10/1000μs waveform). Its glass-passivated junction ensures stable leakage (<1μA @ 28V) and robust surge handling up to 100A I_FSM.

Thermally rated for T_J = –55°C to +175°C, it delivers 1000W peak pulse power (t_p = 1ms) with R_θJL = 20°C/W and R_θJA = 100°C/W - enabling high-reliability placement on compact PCBs without forced cooling in automotive under-hood environments.

Key Specifications

Parameter	Value and Actual Design Meaning
V_WM	28 V - Maximum continuous reverse operating voltage before conduction begins
V_BR (min/max)	31.1 V / 34.4 V - Breakdown voltage range at 1 mA test current; defines turn-on threshold tolerance
V_C @ I_PPM	45.4 V @ 22.0 A - Clamping voltage during 10/1000μs transient; limits downstream IC stress
P_PK	1000 W - Peak pulse power rating (1 ms, non-repetitive); supports ISO 7637-2 Pulse 5a load dump
T_J max	+175 °C - Maximum junction temperature; enables operation in engine-control units and headlamp drivers
Response time	<1.0 ps - Sub-picosecond avalanche response ensures protection before sensitive logic is damaged

Pinout & Package

Package: DO-214AA (SMB), surface-mount, cathode-banded unidirectional configuration. Matte tin-plated leads, JEDEC-compliant footprint, UL 94V-0 molding compound.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current input / transient return path	Connected to protected circuit ground or low-side reference; carries full surge current during clamping
Cathode	Reverse-biased voltage sense / clamping node	Connected to line being protected (e.g., 12V battery rail); voltage rise above V_BR triggers avalanche conduction

Key Features

Feature	Design Value
AEC-Q101 qualified	Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per JESD47
ISO 7637-2 compliance	Withstands Pulse 1 (inductive switch-off), Pulse 2a/2b (battery disconnect), and Pulse 3a/3b (switching noise) waveforms
Glass-passivated junction	Ensures stable V_BR tolerance and low leakage (<1 μA @ V_WM) over lifetime and temperature
Moisture sensitivity level 1	No floor-life limitation or bake requirement prior to reflow; compatible with standard SMT assembly

Applications

Automotive Lighting Control	Engine Control Unit (ECU) Power Input
Use Scenario: Protecting LED driver ICs and microcontrollers from load-dump transients during vehicle ignition cycling. IC Role / Device Role / Timing Role: Shunt clamping device placed between 12V supply rail and ground, activated within <1 ps of overvoltage onset. Use Value: Limits rail voltage to ≤45.4V during 1000W pulses, preventing latch-up or gate oxide damage in 3.3V/5V logic.	Use Scenario: Safeguarding MCU power pins and CAN transceivers against ISO 7637-2 Pulse 5a (load dump) events up to 60V. IC Role / Device Role / Timing Role: Primary front-end transient suppressor on main 12V input, coordinated with upstream fuse and downstream LC filtering. Use Value: Enables uninterrupted operation during 100ms, 60V transients by dissipating energy without failure or parameter shift.
Body Control Module (BCM) LIN Bus	Electric Power Steering (EPS) Sensor Interface
Use Scenario: ESD protection for LIN physical layer transceivers exposed to human contact and harness coupling. IC Role / Device Role / Timing Role: Low-capacitance TVS on LIN signal line (VPIN/VNIN), grounded via shortest possible trace. Use Value: Clamps ±30kV contact ESD (IEC 61000-4-2) to <45.4V while adding <0.5pF parasitic capacitance - preserving 20.2 kbps signal integrity.	Use Scenario: Transient suppression on analog sensor supply lines (e.g., torque sensor V_REF) in EPS motor control assemblies. IC Role / Device Role / Timing Role: Precision rail clamp referenced to isolated 5V sensor supply, placed adjacent to ADC input filter. Use Value: Maintains V_WM = 28V margin above nominal 5V rail, ensuring no false triggering while suppressing coupled spikes from motor commutation.

Automotive Lighting Control

Engine Control Unit (ECU) Power Input

Use Scenario: Protecting LED driver ICs and microcontrollers from load-dump transients during vehicle ignition cycling.

IC Role / Device Role / Timing Role: Shunt clamping device placed between 12V supply rail and ground, activated within <1 ps of overvoltage onset.

Use Value: Limits rail voltage to ≤45.4V during 1000W pulses, preventing latch-up or gate oxide damage in 3.3V/5V logic.

Use Scenario: Safeguarding MCU power pins and CAN transceivers against ISO 7637-2 Pulse 5a (load dump) events up to 60V.

IC Role / Device Role / Timing Role: Primary front-end transient suppressor on main 12V input, coordinated with upstream fuse and downstream LC filtering.

Use Value: Enables uninterrupted operation during 100ms, 60V transients by dissipating energy without failure or parameter shift.

Body Control Module (BCM) LIN Bus

Electric Power Steering (EPS) Sensor Interface

Use Scenario: ESD protection for LIN physical layer transceivers exposed to human contact and harness coupling.

IC Role / Device Role / Timing Role: Low-capacitance TVS on LIN signal line (VPIN/VNIN), grounded via shortest possible trace.

Use Value: Clamps ±30kV contact ESD (IEC 61000-4-2) to <45.4V while adding <0.5pF parasitic capacitance - preserving 20.2 kbps signal integrity.

Use Scenario: Transient suppression on analog sensor supply lines (e.g., torque sensor V_REF) in EPS motor control assemblies.

IC Role / Device Role / Timing Role: Precision rail clamp referenced to isolated 5V sensor supply, placed adjacent to ADC input filter.

Use Value: Maintains V_WM = 28V margin above nominal 5V rail, ensuring no false triggering while suppressing coupled spikes from motor commutation.

Equivalent & Alternatives

The following parts are listed as comparable options for similar transient voltage suppression applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SMBJ28A	Same DO-214AA package, identical V_WM/V_C, but rated at 600W P_PK (vs. 1000W)	Limited to lower-energy transients (e.g., ISO 7637-2 Pulse 1/2 only); not suitable for load dump	Select SMB10J28AH where 1000W peak power is required for automotive load-dump immunity.
SMCJ28A	Higher P_PK = 1500W, same V_WM/V_C, but larger DO-214AB (SMC) package (7.11 × 6.22 mm vs. 4.57 × 3.94 mm)	Requires PCB layout change; better thermal dissipation but incompatible with space-constrained SMB footprints	Choose SMB10J28AH when board area is constrained and 1000W suffices - avoids redesign cost.

Compared with SMBJ28A and SMCJ28A, SMB10J28AH uniquely balances 1000W surge capability with DO-214AA footprint and AEC-Q101 qualification - making it optimal for space-limited, high-reliability automotive modules requiring full ISO 7637-2 coverage without package revision.

Availability

SMB10J28AH is available at Aetrix Electronics and suitable for automotive lighting control, engine control unit (ECU) power input, and body control module (BCM) LIN bus applications requiring stable component supply, AEC-Q101 assurance, and ISO 7637-2 compliance.

Supply support for SMB10J28AH 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

Taiwan Semiconductor Corporation (TSC) is a vertically integrated semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs for automotive, industrial, and consumer markets.

The SMB10JxxAH series is part of TSC's AEC-Q101-qualified transient suppression portfolio, engineered specifically for automotive subsystems needing robust, standardized, and footprint-compatible surge protection across 9V–40V rails.

FAQ

What is the clamping voltage of SMB10J28AH at its rated peak pulse current?

The SMB10J28AH has a maximum clamping voltage (V_C) of 45.4 V at 22.0 A peak pulse current (I_PPM), measured under the standard 10/1000 μs double-exponential waveform. This value ensures downstream components see limited overvoltage during transients. The SMB10J28AH maintains this clamping performance across its specified junction temperature range (–55°C to +175°C), with minimal derating below 1000W up to +125°C ambient.

Is SMB10J28AH suitable for bidirectional transient protection?

No, SMB10J28AH is a unidirectional TVS diode intended for DC rail protection with defined polarity (cathode band marked). For bidirectional applications such as AC lines or differential buses, the SMB10J28CAH variant must be used. The SMB10J28AH lacks symmetrical breakdown characteristics and will conduct heavily in forward bias beyond ~3.5 V, making it unsuitable for alternating or floating signal paths.

Does SMB10J28AH meet automotive qualification standards?

Yes, SMB10J28AH is AEC-Q101 qualified and meets ISO 7637-2 requirements for Pulse 1, 2a, 2b, 3a, and 3b. It also complies with J-STD-020 moisture sensitivity level 1, JESD201 class 2 whisker resistance, and RoHS/halogen-free standards (IEC 61249-2-21). These certifications are documented in Taiwan Semiconductor's official A2102 datasheet revision.

What is the thermal resistance from junction to ambient for SMB10J28AH?

The SMB10J28AH has a junction-to-ambient thermal resistance (R_θJA) of 100°C/W under standard JEDEC test conditions (single device on 1-inch² copper pad). Its junction-to-lead resistance (R_θJL) is 20°C/W, supporting efficient heat transfer to the PCB. These values assume proper soldering to recommended pad layout per the DO-214AA outline drawing in the SMB10J28AH datasheet.

How does SMB10J28AH compare to SMBJ28A in surge handling capability?

SMB10J28AH delivers 1000W peak pulse power (1 ms), whereas SMBJ28A is rated at 600W - a 67% higher energy-handling capacity. Both share identical V_WM (28V), V_BR, and V_C, but SMB10J28AH's higher P_PK enables compliance with ISO 7637-2 Pulse 5a (load dump), which SMBJ28A cannot sustain. The SMB10J28AH remains pin- and footprint-compatible with SMBJ28A, allowing drop-in upgrade where layout permits.

SMB10J28AH Specifications

Product attributes: Attribute value

Manufacturer:: Taiwan Semiconductor Corporation

Package/Case:: DO-214AA, SMB

Series:: SMB10J

Packaging:: Tape & Reel (TR)

Product Status:: Active

Type:: Zener

Unidirectional Channels:: 1

Bidirectional Channels:: -

Voltage - Reverse Standoff (Typ):: 28V

Voltage - Breakdown (Min):: 31.1V

Voltage - Clamping (Max) @ Ipp:: 45.4V

Current - Peak Pulse (10/1000µs):: 22A

Power - Peak Pulse:: 1000W (1kW)

Power Line Protection:: No

Applications:: -

Capacitance @ Frequency:: -

Operating Temperature:: -55°C ~ 175°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: DO-214AA (SMB)

SMB10J28AH FAQ

1.How can I place an order for SMB10J28AH through Aetrix?

Please submit a Request for Quotation (RFQ) for SMB10J28AH 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 SMB10J28AH reliable?

The price and inventory of SMB10J28AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB10J28AH is usually 5 days.

3.What payment methods are accepted for SMB10J28AH?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB10J28AH transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SMB10J28AH?

SMB10J28AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SMB10J28AH 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 SMB10J28AH?

For technical support, including SMB10J28AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB10J28AH requirements.

6.How does Aetrix verify that SMB10J28AH is sourced from the original manufacturer or authorized distributors?

All SMB10J28AH 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 SMB10J28AH meets industry standards.

7.What is the process for return or replacement of SMB10J28AH?

All SMB10J28AH units undergo pre-shipment inspection (PSI). If there is an issue with SMB10J28AH, 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 SMB10J28AH part is unused and in its original packaging.

Return procedure for SMB10J28AH:

1.Submit a request within 90 days.

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

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