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Vishay General Semiconductor - Diodes Division SMBJ28CAHE3_A/H
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- Part No.:
- SMBJ28CAHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ28CAHE3_A/H.pdf
- Description:
- TVS DIODE 28VWM 45.5VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,680
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Product details
Overview
SMBJ28CAHE3_A/H from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in 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 (IPPM), and 600 W peak pulse power rating with 10/1000 µs waveform - deployed in industrial sensor interfaces and automotive ECUs.
For engineers reviewing the SMBJ28CAHE3_A/H datasheet, SMBJ28CAHE3_A/H pinout, SMBJ28CAHE3_A/H application, or SMBJ28CAHE3_A/H equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification status, thermal resistance (RθJA = 100 °C/W), and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This bidirectional TVS operates symmetrically in both polarities, enabling protection of AC-coupled or differential signal paths without polarity constraints. Its glass-passivated junction ensures stable VBR tolerance and low leakage (<1.0 µA at VWM), while the low incremental surge resistance supports consistent clamping under repetitive transients.
The device is rated for -55 °C to +150 °C operating junction temperature and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak. Its AEC-Q101 qualification (indicated by HE3 suffix) confirms suitability for automotive electronics where reliability under thermal cycling and humidity is critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - maximum continuous reverse working voltage before clamping initiates |
| VBR min/max | 31.1 V / 34.4 V at IT = 1 mA - defines guaranteed breakdown window for design margining |
| VC @ IPPM | 45.4 V at 13.2 A - clamping voltage during 10/1000 µs transient, limiting downstream stress |
| PPPM | 600 W - peak pulse power handling capacity under standardized surge waveform |
| ID @ VWM | ≤1.0 µA - ultra-low reverse leakage preserves signal integrity in high-impedance circuits |
| TJ max | +150 °C - enables operation in under-hood automotive or industrial power supply environments |
| RθJA | 100 °C/W - thermal resistance from junction to ambient on standard 0.2" × 0.2" pad layout |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional - no polarity marking; symmetrical two-terminal construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient conduction path | Both terminals function identically; clamps voltage excursions above ±45.4 V in either direction |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock |
| 600 W peak pulse power | Withstands IEC 61000-4-5 Level 4 surges (4 kV line-earth, 2 kV line-line) when properly laid out |
| Glass-passivated junction | Ensures stable VBR over lifetime and immunity to moisture-induced parameter drift |
| MSL Level 1 | Zero floor life limitation; safe for standard reflow without baking or dry pack requirements |
| Low profile SMB package | Enables high-density PCB layouts and compatibility with automated pick-and-place equipment |
Applications
| Automotive Body Control Module (BCM) | Industrial CAN Bus Interface |
|---|---|
Use Scenario: Protects LIN and CAN signal lines from load-dump and inductive switching transients in vehicle door modules and lighting controllers. IC Role / Device Role / Timing Role: Bidirectional clamping element placed directly at connector entry point to shunt ESD and ISO 7637-2 pulses. Use Value: Maintains signal integrity below 45.4 V clamping threshold while surviving >1000 surges per AEC-Q101 stress test protocol. |
Use Scenario: Shields RS-485/CAN transceivers from field-induced surges in factory automation PLC backplanes. IC Role / Device Role / Timing Role: Primary transient suppressor across differential bus lines (CAN_H/CAN_L), mounted adjacent to connector. Use Value: Limits bus voltage excursion to ≤45.4 V during 10/1000 µs transients, preventing transceiver latch-up or damage. |
| Consumer Appliance Motor Drive | Telecom Power Input Stage |
Use Scenario: Guards microcontroller GPIOs and gate drivers against back-EMF spikes from brushed DC motors in smart home appliances. IC Role / Device Role / Timing Role: Localized TVS at motor driver IC inputs to clamp fast-rising inductive kickback (tR < 1 ns). Use Value: Responds in <1 ps to transients, clamping within 45.4 V to avoid exceeding MCU absolute maximum ratings. |
Use Scenario: Front-end protection on 24 V DC telecom power input against lightning-induced surges and hot-swap transients. IC Role / Device Role / Timing Role: First-stage clamping device upstream of DC/DC converter, sized for 600 W single-event dissipation. Use Value: Absorbs up to 600 W peak power without degradation, maintaining VWM = 28 V for compatibility with 24 V nominal systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ28CA-M3/52 | Halogen-free, RoHS-compliant, commercial grade - lacks AEC-Q101 qualification | Not approved for automotive use; suitable for industrial or consumer products with lower reliability requirements | Select when AEC-Q101 is not mandated and halogen-free compliance is required |
| SMCJ28CAHE3_A/H | Same electrical specs but in larger SMC (DO-214AB) package - higher thermal mass, RθJA = 50 °C/W | Better power handling under sustained surge conditions; requires more PCB area | Select when higher thermal robustness is needed and board space permits larger footprint |
Compared with SMBJ28CAHE3_A/H, the SMBJ28CA-M3/52 offers identical clamping performance without automotive qualification, while the SMCJ28CAHE3_A/H provides superior thermal derating at the cost of increased board area - choice depends on reliability tier and layout constraints.
Availability
SMBJ28CAHE3_A/H is available at Aetrix Electronics and suitable for automotive body electronics, industrial CAN networks, and telecom power input protection requiring stable component supply and long-term lifecycle support.
Supply support for SMBJ28CAHE3_A/H 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SMBJ series is part of Vishay's TRANSZORB® TVS platform, engineered for robust transient suppression in automotive, industrial, and communications infrastructure where failure modes must be mitigated without compromising signal fidelity.
FAQ
What does the "CA" suffix indicate in SMBJ28CAHE3_A/H?
The "CA" suffix denotes a bidirectional configuration - meaning SMBJ28CAHE3_A/H clamps voltage transients equally in both polarities, unlike unidirectional "A" variants that conduct only in reverse bias. This makes SMBJ28CAHE3_A/H ideal for protecting AC-coupled or differential signal lines such as CAN, RS-485, or audio interfaces where polarity is undefined or alternating.
Is SMBJ28CAHE3_A/H qualified for automotive applications?
Yes, SMBJ28CAHE3_A/H is AEC-Q101 qualified, as confirmed by the "HE3" suffix and Vishay documentation. This qualification covers stress tests including temperature cycling, high-temperature operating life, and unbiased highly accelerated stress testing - validating SMBJ28CAHE3_A/H for use in engine control units, body electronics, and infotainment systems.
What is the maximum clamping voltage of SMBJ28CAHE3_A/H under surge conditions?
The maximum clamping voltage (VC) of SMBJ28CAHE3_A/H is 45.4 V at 13.2 A peak pulse current (IPPM), measured with a 10/1000 µs waveform. This value represents the upper limit of voltage seen by protected circuitry during worst-case transient events, ensuring downstream ICs remain within safe operating limits when SMBJ28CAHE3_A/H is correctly applied.
How does the SMB (DO-214AA) package affect thermal performance of SMBJ28CAHE3_A/H?
The SMB package delivers RθJA = 100 °C/W when mounted on 0.2" × 0.2" copper pads per Vishay's recommended layout. This thermal resistance determines steady-state power dissipation limits and transient thermal response - for example, SMBJ28CAHE3_A/H can sustain 5.0 W continuously at TA = 50 °C, but requires careful PCB copper area allocation to avoid junction overheating during repeated surges.
Can SMBJ28CAHE3_A/H replace unidirectional TVS diodes in existing designs?
No - SMBJ28CAHE3_A/H is strictly bidirectional and cannot substitute for unidirectional TVS diodes like SMBJ28AHE3_A/H without circuit review. Unidirectional devices conduct forward current and require polarity-aware placement; using SMBJ28CAHE3_A/H in their place may cause unintended conduction or fail to suppress certain transient polarities. Always verify signal path symmetry before substitution.
SMBJ28CAHE3_A/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 28V
- Voltage - Breakdown (Min):
- 31.1V
- Voltage - Clamping (Max) @ Ipp:
- 45.5V
- 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:
- DO-214AA (SMBJ)
SMBJ28CAHE3_A/H FAQ
1.How can I place an order for SMBJ28CAHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ28CAHE3_A/H 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 SMBJ28CAHE3_A/H reliable?
The price and inventory of SMBJ28CAHE3_A/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ28CAHE3_A/H is usually 5 days.
3.What payment methods are accepted for SMBJ28CAHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ28CAHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ28CAHE3_A/H?
SMBJ28CAHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ28CAHE3_A/H 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 SMBJ28CAHE3_A/H?
For technical support, including SMBJ28CAHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ28CAHE3_A/H requirements.
6.How does Aetrix verify that SMBJ28CAHE3_A/H is sourced from the original manufacturer or authorized distributors?
All SMBJ28CAHE3_A/H 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 SMBJ28CAHE3_A/H meets industry standards.
7.What is the process for return or replacement of SMBJ28CAHE3_A/H?
All SMBJ28CAHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ28CAHE3_A/H, 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 SMBJ28CAHE3_A/H part is unused and in its original packaging.
Return procedure for SMBJ28CAHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ28CAHE3_A/H Tags
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Diodes Incorporated
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