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Vishay General Semiconductor - Diodes Division SMBJ28CAHM3/I
- Part No.:
- SMBJ28CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ28CAHM3/I.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,948
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Product details
Overview
SMBJ28CAHM3/I from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in the SMB (DO-214AA) package, designed for clamping voltage transients on signal and power lines. It features a 28 V stand-off voltage (VWM), 31.1–34.4 V breakdown voltage (VBR) at 1 mA, 45.4 V maximum clamping voltage (VC) at 13.2 A peak pulse current, and 600 W peak pulse power rating with 10/1000 µs waveform - used to protect MOSFETs, ICs, and sensor signal lines in industrial and telecom equipment.
For engineers reviewing the SMBJ28CAHM3/I datasheet, SMBJ28CAHM3/I pinout, SMBJ28CAHM3/I application, or SMBJ28CAHM3/I equivalent, this device is selected for robust ESD and surge immunity in bidirectional AC-coupled interfaces, low-leakage (<1.0 µA at VWM) signal line protection, and AEC-Q101-qualified designs requiring halogen-free, RoHS-compliant components with MSL Level 1 reflow capability.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, delivering identical clamping behavior during positive and negative transients. Its glass-passivated junction ensures stable VBR tolerance (±5%), low incremental surge resistance, and fast response time (<1 ns) to transient events such as inductive switching spikes and lightning-induced surges.
The device is rated for continuous operation from –55 °C to +150 °C junction temperature, with thermal resistance of 100 °C/W (junction-to-ambient) and 20 °C/W (junction-to-lead). It meets UL 497B recognition (QVGQ2) and is qualified to AEC-Q101 when ordered with HM3 suffix - confirming suitability for automotive-grade reliability testing including temperature cycling and HTRB.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - Maximum continuous reverse operating voltage before significant leakage; defines safe signal swing range for protected line |
| VBR (min/max) | 31.1 V / 34.4 V at IT = 1 mA - Confirmed breakdown threshold ensuring reliable turn-on during overvoltage events |
| VC @ IPPM | 45.4 V at 13.2 A - Clamped voltage seen by downstream circuitry during 600 W transient; limits stress on connected ICs |
| IPPM | 13.2 A - Peak surge current capability under 10/1000 µs waveform; determines survivability against defined surge standards |
| PPPM | 600 W - Peak pulse power handling capacity; enables protection against IEC 61000-4-5 Level 3/4 surges when properly mounted |
| ID @ VWM | <1.0 µA - Ultra-low reverse leakage preserves signal integrity and power efficiency in high-impedance circuits |
| TJ max. | +150 °C - Enables operation in under-hood automotive or high-temperature industrial environments without derating |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, RoHS-compliant, MSL Level 1 (260 °C peak reflow), matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. No polarity marking for bidirectional configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative polarity) | Conducts during negative-going surges; forms symmetrical clamping path with cathode |
| Cathode | Transient current entry (positive polarity) | Conducts during positive-going surges; paired with anode to enable bidirectional clamping |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR, VC, and IPPM performance for ± transients - eliminates need for dual unidirectional devices on AC lines |
| AEC-Q101 qualification | Validated for automotive applications including temperature cycling, HTRB, and mechanical shock - supports HM3 suffix variants |
| 600 W peak pulse power | Withstands IEC 61000-4-5 combination wave surges up to 1 kV/500 A when mounted on recommended 5.0 mm × 5.0 mm copper pads |
| Low clamping ratio (VC/VBR) | 1.45 typical - minimizes overvoltage exposure to protected ICs while maintaining margin above VWM |
| MSL Level 1 reflow compatibility | Supports lead-free reflow up to 260 °C peak without popcorn effect or parameter shift - suitable for high-volume SMT assembly |
Applications
| Industrial Motor Control | Automotive Sensor Interface |
|---|---|
|
Use Scenario: Protecting encoder feedback lines and Hall-effect sensor outputs from inductive kickback in 24 V DC motor drives. IC Role / Device Role / Timing Role: Bidirectional TVS clamping transient spikes induced by relay or MOSFET switching in proximity to analog signal paths. Use Value: Prevents latch-up or damage to microcontroller ADC inputs and comparator stages while preserving signal fidelity below 28 V nominal range. |
Use Scenario: Shielding LIN bus transceivers and pressure sensor signal conditioning circuits from battery dump and load-dump events. IC Role / Device Role / Timing Role: Fast-response voltage clamp absorbing >100 V transients within nanoseconds to maintain communication integrity during vehicle cranking. Use Value: Enables compliance with ISO 7637-2 Pulse 1/2a/5a and AEC-Q100 stress tests using single-device bidirectional protection. |
| Telecom Power Feeds | Consumer USB-C Port Protection |
|
Use Scenario: Safeguarding PoE-powered Ethernet PHYs and DC-DC controllers from lightning-induced surges on 48 V power pairs. IC Role / Device Role / Timing Role: High-power transient suppressor placed at RJ45 connector entry point to shunt energy before reaching isolation transformers. Use Value: Delivers 600 W pulse handling with <45.4 V clamping to prevent overvoltage failure of 50 V-rated magnetics and controller ICs. |
Use Scenario: Protecting USB-C CC and VBUS lines against ESD and hot-plug transients in portable docking stations and chargers. IC Role / Device Role / Timing Role: Low-capacitance bidirectional clamp suppressing ±15 kV contact ESD (IEC 61000-4-2) without distorting high-speed signaling. Use Value: Maintains <1.0 µA leakage at 28 V to avoid bias disruption on CC logic lines while meeting USB-IF ESD requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ28CAHE3/I | Same electrical specs; RoHS-compliant but not halogen-free; no AEC-Q101 qualification | Suitable for commercial/industrial use where halogen-free or automotive qualification is not required | Select when cost sensitivity outweighs halogen-free or automotive reliability requirements |
| SMAJ28CAHM3 | Lower 400 W PPPM; SMA (DO-214AC) package with smaller footprint and higher thermal resistance (RθJA = 140 °C/W) | Acceptable for lower-energy transients or space-constrained layouts where 600 W headroom is not needed | Choose only if board area is critical and surge threat level is limited to IEC 61000-4-2/4-4, not 4-5 |
Compared with SMBJ28CAHM3/I, SMBJ28CAHE3/I offers identical protection performance without halogen-free or AEC-Q101 assurance, while SMAJ28CAHM3 trades 33 % lower surge power and reduced thermal performance for 30 % smaller PCB area - neither is pin-compatible due to differing package outlines (SMB vs. SMA).
Availability
SMBJ28CAHM3/I is available at Aetrix Electronics and suitable for industrial motor control, automotive sensor interface, telecom power feeds, and consumer USB-C port protection requiring stable component supply, halogen-free compliance, and AEC-Q101-qualified reliability.
Supply support for SMBJ28CAHM3/I 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
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, TVS devices, and optoelectronics with emphasis on high-reliability, high-efficiency solutions.
The SMBJ series was developed to deliver standardized, high-power transient suppression in compact surface-mount packages for automotive, industrial, and communications systems demanding consistent clamping and long-term stability.
FAQ
What is the clamping voltage of SMBJ28CAHM3/I at its rated peak pulse current?
The SMBJ28CAHM3/I has a maximum clamping voltage (VC) of 45.4 V at its rated peak pulse current (IPPM) of 13.2 A, measured under the standard 10/1000 µs waveform. This value defines the upper voltage limit imposed on protected circuitry during a full-power transient event and is confirmed in the Vishay SMBJ5.0A–SMBJ188A datasheet revision 09-Jan-2024, page 2. The SMBJ28CAHM3/I maintains this clamping performance bidirectionally.
Is SMBJ28CAHM3/I suitable for automotive applications?
Yes, SMBJ28CAHM3/I is AEC-Q101 qualified, as indicated by the "HM3" suffix (halogen-free, RoHS-compliant, and AEC-Q101 qualified). It undergoes stress testing including temperature cycling, high-temperature reverse bias, and mechanical shock per AEC-Q101 Rev D. The SMBJ28CAHM3/I is specified for junction temperatures from –55 °C to +150 °C, supporting under-hood and body-control module deployments.
What does the "CA" suffix mean in SMBJ28CAHM3/I?
The "CA" suffix in SMBJ28CAHM3/I denotes a bidirectional configuration - meaning the device provides symmetrical transient suppression for both positive and negative voltage excursions. Unlike unidirectional "A" variants, SMBJ28CAHM3/I has no cathode band marking and delivers identical VBR, VC, and IPPM characteristics in either polarity, making it ideal for AC-coupled or floating signal lines.
What is the maximum reverse leakage current for SMBJ28CAHM3/I at its stand-off voltage?
The SMBJ28CAHM3/I exhibits a maximum reverse leakage current (ID) of 1.0 µA at its rated stand-off voltage (VWM) of 28 V, tested at TA = 25 °C. This ultra-low leakage preserves signal integrity in high-impedance sensor interfaces and ensures minimal power loss in always-on circuits - a key specification verified in the Electrical Characteristics table on page 2 of the Vishay datasheet 88392.
How does the SMB (DO-214AA) package of SMBJ28CAHM3/I compare thermally to SMA (DO-214AC)?
The SMB (DO-214AA) package used by SMBJ28CAHM3/I provides lower thermal resistance than SMA: RθJA = 100 °C/W versus 140 °C/W for SMAJ variants. This 40 % improvement allows SMBJ28CAHM3/I to sustain higher average power dissipation and recover faster between transient events - especially critical in repetitive surge environments like motor drive feedback loops.
SMBJ28CAHM3/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- 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:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMBJ28CAHM3/I FAQ
1.How can I place an order for SMBJ28CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ28CAHM3/I 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 SMBJ28CAHM3/I reliable?
The price and inventory of SMBJ28CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ28CAHM3/I is usually 5 days.
3.What payment methods are accepted for SMBJ28CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ28CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ28CAHM3/I?
SMBJ28CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ28CAHM3/I 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 SMBJ28CAHM3/I?
For technical support, including SMBJ28CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ28CAHM3/I requirements.
6.How does Aetrix verify that SMBJ28CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SMBJ28CAHM3/I 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 SMBJ28CAHM3/I meets industry standards.
7.What is the process for return or replacement of SMBJ28CAHM3/I?
All SMBJ28CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ28CAHM3/I, 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 SMBJ28CAHM3/I part is unused and in its original packaging.
Return procedure for SMBJ28CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ28CAHM3/I Tags
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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