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

Diodes Incorporated SMBJ28AQ-13-F

Name: SMBJ28AQ-13-F
Brand: Diodes Incorporated
SKU: SMBJ28AQ-13-F
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SMBJ28AQ-13-F

Manufacturer:: Diodes Incorporated

Category:: TVS Diodes

Package:: DO-214AA, SMB

Datasheet:: SMBJ28AQ-13-F.pdf

Description:: TVS DIODE 28VWM 45.4VC SMB

Quantity:: RFQ Add To RFQ list

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Product details

Overview

SMBJ28AQ-13-F from Diodes Incorporated is a unidirectional 600W surface-mount automotive transient voltage suppressor (TVS) diode with 28V reverse standoff voltage, 31.1V minimum breakdown voltage, and 45.4V maximum clamping voltage at 13.2A peak pulse current. It protects CAN, LIN, and power-line circuits in engine control units and body electronics against ISO7637-2 Pulse 1/2a/3a/3b surges and ISO10605 ESD events.

For engineers reviewing the SMBJ28AQ-13-F datasheet, SMBJ28AQ-13-F pinout, SMBJ28AQ-13-F application, or SMBJ28AQ-13-F equivalent, key selection criteria include clamping voltage margin relative to system rail, I_PP capability under 10/1000μs waveform, AEC-Q101 qualification status, and SMB package thermal performance under pulsed surge conditions.

Technical Context

This TVS diode operates as a unidirectional clamping device, conducting only during negative transients on the anode-cathode path. Its 28V V_RWM supports 24V automotive systems with 20% tolerance margin, while 45.4V V_C ensures safe clamping below 48V-rated downstream ICs.

The device uses silicon avalanche junction technology with 100A I_FSM (8.3ms half-sine) and 5W steady-state power dissipation at T_L = +75°C. It meets AEC-Q101 stress test requirements and is manufactured in IATF 16949-certified facilities with PPAP capability.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RWM	28V - Maximum continuous reverse operating voltage before clamping begins; sets minimum system rail margin for 24V nominal bus.
V_BR (min)	31.1V - Minimum breakdown voltage at 1mA test current; defines guaranteed conduction onset threshold.
V_C	45.4V - Maximum clamped voltage at 13.2A I_PP (10×1000μs); determines worst-case overvoltage seen by protected ICs.
P_PK	600W - Peak pulse power rating; defines energy absorption capacity for standardized surge waveforms.
I_PP	13.2A - Peak pulse current at V_C; directly correlates with surge immunity level per ISO7637-2 Pulse 3b (+150V).
T_J Range	−55°C to +175°C - Operating junction temperature range; enables placement near high-heat sources like power MOSFETs or ECUs.

Pinout & Package

Package: SMB (DO-214AA), surface-mount, molded plastic with UL 94V-0 flammability rating, 0.1g weight, and matte tin lead finish. Moisture sensitivity level 1 per J-STD-020.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Surge return path	Connected to ground or low-impedance chassis reference; carries full transient current during clamping.
Cathode	Protected line connection	Connected to signal/power line being protected; polarity band identifies cathode side on top view.

Key Features

Feature	Design Value
600W peak pulse power	Enables compliance with ISO7637-2 Pulse 1 (−150V) and Pulse 3b (+150V) without derating in standard PCB layouts.
AEC-Q101 qualified	Validated for automotive under-hood and cabin applications with extended temperature cycling, HTRB, and ESD robustness testing.
Lead-free & halogen-free	Meets RoHS 3 (2015/863/EU) and automotive green standards (<900ppm Br, <900ppm Cl, <1000ppm Sb).
Low clamping ratio (V_C/V_RWM = 1.62)	Minimizes voltage overshoot during fast transients, reducing stress on 3.3V/5V interface ICs downstream of protection stage.

Applications

Engine Control Unit (ECU) Power Input

CAN FD Transceiver Protection

Use Scenario: 24V battery feed to microcontroller power supply in diesel ECU exposed to load dump and alternator ripple.

IC Role / Device Role: Primary overvoltage clamp on main 24V input rail upstream of DC-DC converter.

Use Value: Limits transient voltage to ≤45.4V, preventing damage to 48V-rated buck controller and maintaining >3V margin below its absolute maximum rating.

Use Scenario: Bidirectional data line protection on 500 kbps CAN FD bus in ADAS domain controller.

IC Role / Device Role: Unidirectional TVS on CAN_H line referenced to chassis ground.

Use Value: Clamps ESD events up to ±30kV (contact/air) while adding <0.5pF parasitic capacitance, preserving signal integrity at 2 Mbps.

Body Control Module (BCM) LIN Bus

Automotive Lighting Driver Input

Use Scenario: 12V LIN bus node in door module subjected to ISO7637-2 Pulse 2a (+112V) during load switching.

IC Role / Device Role: Line-side TVS between LIN transceiver and connector.

Use Value: Absorbs 600W surge energy within 1000μs, limiting voltage excursion to 45.4V and protecting 16V-rated LIN PHY.

Use Scenario: Input protection for LED driver IC powering exterior lamps during cold crank (−40°C) and hot soak (+125°C).

IC Role / Device Role: First-stage transient suppressor on 24V supply rail feeding buck LED controller.

Use Value: Maintains operation across −55°C to +175°C junction range and withstands 100A surge without degradation after 1000 cycles.

Equivalent & Alternatives

The following parts are listed as comparable options for similar unidirectional TVS diode applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SMBJ28A-13-F	No AEC-Q101 qualification; standard industrial grade only.	Not approved for automotive production; suitable for non-safety-critical industrial controls.	Select when AEC-Q101 is not required and cost is primary constraint.
SMCJ28A-Q	Higher P_PK (1500W); larger SMC package (DO-214AB); same V_RWM/V_C.	Used where higher surge energy (e.g., ISO7637-2 Pulse 1 −200V) or board-level thermal mass permits larger footprint.	Select when system-level surge testing exceeds 600W or PCB layout allows SMC footprint.

Compared with SMBJ28A-13-F, SMBJ28AQ-13-F adds AEC-Q101 qualification and PPAP support for automotive release, while SMCJ28A-Q trades SMB footprint for 2.5× higher peak power-making SMBJ28AQ-13-F optimal for space-constrained, production-grade 24V automotive nodes requiring validated reliability.

Availability

SMBJ28AQ-13-F is available at Aetrix Electronics and suitable for engine control units, CAN FD networks, body control modules, and automotive lighting systems requiring stable component supply across automotive production lifecycles.

Supply support for SMBJ28AQ-13-F 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability components for automotive, industrial, and computing markets.

The SMBJ(AQ) series is designed specifically for automotive transient suppression, with AEC-Q101 qualification, IATF 16949 manufacturing, and compliance to ISO7637-2 and ISO10605 standards.

FAQ

What is the polarity configuration of SMBJ28AQ-13-F?

SMBJ28AQ-13-F is a unidirectional TVS diode with cathode-anode polarity. The cathode is marked by a band on the SMB package top surface. It conducts only during reverse-biased transients (anode negative relative to cathode), making it suitable for protecting positive rails referenced to ground.

Does SMBJ28AQ-13-F meet ISO7637-2 Pulse 3b requirements?

Yes. With a 45.4V clamping voltage at 13.2A and 600W peak power, SMBJ28AQ-13-F clamps ISO7637-2 Pulse 3b (+150V, 50Ω source) to below 48V-well within the safe operating range of 48V-tolerant automotive ICs and satisfying OEM requirements for 24V system protection.

How does the SMB package affect thermal performance under repeated surges?

The SMB package provides 5W steady-state power dissipation at T_L = +75°C. Under repetitive 10/1000μs pulses at ≤4 pulses/minute, junction temperature rise remains within limits due to low thermal resistance (R_θJA ≈ 80°C/W typical), enabling reliable operation without heatsinking in standard FR-4 layouts.

Is SMBJ28AQ-13-F compatible with lead-free reflow profiles?

Yes. It features matte tin lead finish and is rated for standard JEDEC J-STD-020D reflow profiles, including peak temperatures up to 260°C. The device passes solderability testing per MIL-STD-202, Method 208 and has moisture sensitivity level 1, eliminating bake requirements prior to assembly.

SMBJ28AQ-13-F Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Package/Case:: DO-214AA, SMB

Series:: -

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):: 13.2A

Power - Peak Pulse:: 600W

Power Line Protection:: No

Applications:: -

Capacitance @ Frequency:: -

Operating Temperature:: -55°C ~ 150°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: SMB

SMBJ28AQ-13-F FAQ

1.How can I place an order for SMBJ28AQ-13-F through Aetrix?

Please submit a Request for Quotation (RFQ) for SMBJ28AQ-13-F 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 SMBJ28AQ-13-F reliable?

The price and inventory of SMBJ28AQ-13-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ28AQ-13-F is usually 5 days.

3.What payment methods are accepted for SMBJ28AQ-13-F?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ28AQ-13-F transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SMBJ28AQ-13-F?

SMBJ28AQ-13-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SMBJ28AQ-13-F 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 SMBJ28AQ-13-F?

For technical support, including SMBJ28AQ-13-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ28AQ-13-F requirements.

6.How does Aetrix verify that SMBJ28AQ-13-F is sourced from the original manufacturer or authorized distributors?

All SMBJ28AQ-13-F 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 SMBJ28AQ-13-F meets industry standards.

7.What is the process for return or replacement of SMBJ28AQ-13-F?

All SMBJ28AQ-13-F units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ28AQ-13-F, 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 SMBJ28AQ-13-F part is unused and in its original packaging.

Return procedure for SMBJ28AQ-13-F:

1.Submit a request within 90 days.

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

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