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Vishay General Semiconductor - Diodes Division SMB8J28CA-E3/5B
- Part No.:
- SMB8J28CA-E3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J28CA-E3/5B.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,429
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Product details
Overview
SMB8J28CA-E3/5B from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for high-energy surge protection 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 clamping voltage (VC) at 17.6 A peak pulse current (IPPM), and 800 W peak pulse power (10/1000 µs waveform), suitable for automotive sensor interface protection.
For engineers reviewing the SMB8J28CA-E3/5B datasheet, SMB8J28CA-E3/5B pinout, SMB8J28CA-E3/5B application, or SMB8J28CA-E3/5B equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, low clamping ratio (VC/VBR ≈ 1.39), MSL Level 1 moisture sensitivity, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This TVS diode uses a glass-passivated silicon junction to achieve fast response time (<1 ps), low incremental surge resistance, and stable clamping under repetitive transients. Its bidirectional architecture enables symmetric suppression of positive and negative voltage spikes without polarity dependency.
Designed per ANSI/IEEE C62.35 standards, SMB8J28CA-E3/5B operates across –55 °C to +150 °C junction temperature range and delivers 800 W peak pulse power with derating above 25 °C ambient, supported by RθJA = 72 °C/W and RθJL = 20 °C/W thermal performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - Maximum continuous reverse operating voltage before significant leakage; defines safe working margin below breakdown. |
| VBR (min/max) | 31.1 V / 34.4 V at IT = 1 mA - Confirmed breakdown threshold range; ensures reliable triggering during overvoltage events. |
| VC @ IPPM | 45.4 V at 17.6 A (10/1000 µs) - Clamped voltage seen by protected circuit; determines maximum stress on downstream ICs. |
| PPPM | 800 W - Peak surge energy handling capacity; validates suitability for ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 applications. |
| IPPM | 17.6 A - Peak surge current capability; directly supports protection of 12 V automotive bus lines against load dump surges. |
| Junction Temp Range | –55 °C to +150 °C - Enables deployment in under-hood automotive environments and industrial control enclosures. |
| AEC-Q101 Qualified | Yes - Certified for automotive-grade reliability including HTOL, TC, UHAST, and ESD testing per JESD47. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional device with no polarity marking; molded case meets UL 94 V-0 flammability rating; matte tin-plated leads compliant with J-STD-002 and JESD 22-B102 solderability standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient conduction path | Bidirectional terminals - either end serves as anode or cathode depending on transient polarity; no color band or marking required. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive electronics including engine control units, ADAS sensors, and body control modules. |
| Low clamping ratio (VC/VBR ≈ 1.39) | Minimizes voltage overshoot during clamping, reducing risk of latch-up or damage to 3.3 V/5 V logic interfaces. |
| MSL Level 1 (260 °C peak reflow) | Enables single-pass lead-free reflow assembly without moisture-induced popcorn failure or delamination. |
| Glass-passivated junction | Ensures long-term stability of VBR and leakage current under thermal cycling and humidity exposure. |
| 800 W peak pulse power (10/1000 µs) | Supports robust protection against ISO 16750-2 load dump transients and coupled lightning surges in industrial fieldbus nodes. |
Applications
| Automotive Sensor Interface | Industrial CAN Bus Node |
|---|---|
Use Scenario: Protection of LIN/CAN transceiver inputs against ESD and inductive switching transients in vehicle door modules. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed between transceiver pins and connector interface. Use Value: Limits transient voltage to ≤45.4 V, preventing damage to MAX13041 or TJA1042T/3 transceivers while maintaining signal integrity. |
Use Scenario: Surge suppression on RS-485/CAN differential pairs in factory automation PLC I/O modules. IC Role / Device Role / Timing Role: Primary line-level TVS on bus termination side, upstream of common-mode choke. Use Value: Absorbs up to 800 W of 10/1000 µs surge energy without degradation, preserving data integrity during motor drive switching noise events. |
| Consumer USB Power Delivery | Telecom PoE Midspan |
Use Scenario: Overvoltage protection on 5 V/9 V/15 V USB PD CC and VCONN lines in portable docking stations. IC Role / Device Role / Timing Role: Secondary protection stage after primary polymer PTC, placed adjacent to USB-C connector. Use Value: Clamps fast ESD events (IEC 61000-4-2 ±15 kV contact) within <1 ps, preventing latch-up in USB PD controllers like FUSB302. |
Use Scenario: DC input surge protection on 48 V PoE midspan injectors exposed to lightning-induced surges on outdoor Ethernet runs. IC Role / Device Role / Timing Role: Front-end bidirectional clamp on PSE output before transformer isolation and DC-DC regulation. Use Value: Withstands repeated 800 W surges while maintaining VWM = 28 V margin above nominal 48 V supply, enabling compliance with IEEE 802.3bt Type 4 requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ28CA-E3/5B | Same SMB package and VWM/VBR/VC specs, but rated for 600 W (not 800 W) peak pulse power. | Limited to lower-energy transients (e.g., IEC 61000-4-2 only); insufficient for ISO 7637-2 Pulse 5a load dump. | Select when cost sensitivity outweighs need for full 800 W surge margin and AEC-Q101 is not required. |
| SMCJ28CA-E3/5B | Same electrical specs but in larger SMC (DO-214AB) package; higher PPPM = 1500 W and lower RθJA = 35 °C/W. | Requires PCB layout change; better suited for high-power industrial AC/DC front-ends than space-constrained automotive modules. | Choose when thermal management is critical and board area permits larger footprint; not drop-in compatible. |
Compared with SMBJ28CA-E3/5B and SMCJ28CA-E3/5B, SMB8J28CA-E3/5B uniquely balances 800 W surge capability, AEC-Q101 qualification, and SMB footprint-making it optimal for automotive and compact industrial designs where both reliability and space efficiency are mandatory.
Availability
SMB8J28CA-E3/5B is available at Aetrix Electronics and suitable for automotive sensor protection, industrial CAN bus nodes, USB PD interface hardening, and telecom PoE midspan surge suppression requiring stable component supply and AEC-Q101 traceability.
Supply support for SMB8J28CA-E3/5B 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, MOSFETs, and protection devices with emphasis on reliability, power density, and automotive qualification.
The SMB8J series is part of Vishay's TRANSZORB® TVS platform engineered specifically for high-power-density, AEC-Q101-compliant transient suppression in harsh automotive and industrial environments.
FAQ
What is the clamping voltage of SMB8J28CA-E3/5B at its rated peak pulse current?
The SMB8J28CA-E3/5B has a maximum clamping voltage (VC) of 45.4 V at 17.6 A peak pulse current (IPPM) under the standard 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and confirmed in Vishay's Document Number 88422, ensuring predictable voltage limiting during surge events. The SMB8J28CA-E3/5B maintains this clamping performance across its full operating temperature range.
Is SMB8J28CA-E3/5B suitable for automotive applications?
Yes, SMB8J28CA-E3/5B is AEC-Q101 qualified and explicitly listed in Vishay's automotive ordering codes (HE3/HM3 suffix variants). It undergoes stress testing for high-temperature operating life, temperature cycling, and ESD robustness required for under-hood and cabin electronics. The SMB8J28CA-E3/5B meets these requirements without derating in ambient temperatures up to +125 °C.
What is the standoff voltage (VWM) and why does it matter for SMB8J28CA-E3/5B?
The SMB8J28CA-E3/5B has a standoff voltage (VWM) of 28 V, meaning it remains non-conductive up to this reverse voltage level with leakage current ≤1.0 µA. This parameter ensures the SMB8J28CA-E3/5B does not interfere with normal 24 V automotive or industrial bus operation while providing headroom before breakdown at 31.1–34.4 V. Proper VWM selection prevents false triggering during voltage ripple or cold-crank conditions.
Does SMB8J28CA-E3/5B have polarity markings, and how is it mounted?
No, SMB8J28CA-E3/5B is a bidirectional TVS diode and carries no polarity marking (e.g., cathode band) on its SMB (DO-214AA) package. It is mounted using standard SMT reflow with matte tin-plated leads compliant with J-STD-002. Recommended pad layout is 0.2" × 0.2" (5.0 mm × 5.0 mm) copper per terminal to sustain full 800 W pulse power dissipation, as specified in Vishay's Document Number 88422.
How does SMB8J28CA-E3/5B compare to unidirectional variants like SMB10J28A-E3/5B?
The SMB8J28CA-E3/5B is bidirectional with symmetrical clamping for ± transients, whereas SMB10J28A-E3/5B is unidirectional (cathode-banded) and only protects against positive surges relative to ground. SMB8J28CA-E3/5B offers 800 W PPPM, while SMB10J28A-E3/5B delivers 1000 W-but the latter cannot suppress negative-going transients without additional components. The SMB8J28CA-E3/5B is preferred for differential or floating-line protection where polarity is undefined.
SMB8J28CA-E3/5B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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):
- 17.6A
- Power - Peak Pulse:
- 800W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMB8J28CA-E3/5B FAQ
1.How can I place an order for SMB8J28CA-E3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J28CA-E3/5B 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 SMB8J28CA-E3/5B reliable?
The price and inventory of SMB8J28CA-E3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J28CA-E3/5B is usually 5 days.
3.What payment methods are accepted for SMB8J28CA-E3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J28CA-E3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J28CA-E3/5B?
SMB8J28CA-E3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J28CA-E3/5B 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 SMB8J28CA-E3/5B?
For technical support, including SMB8J28CA-E3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J28CA-E3/5B requirements.
6.How does Aetrix verify that SMB8J28CA-E3/5B is sourced from the original manufacturer or authorized distributors?
All SMB8J28CA-E3/5B 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 SMB8J28CA-E3/5B meets industry standards.
7.What is the process for return or replacement of SMB8J28CA-E3/5B?
All SMB8J28CA-E3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J28CA-E3/5B, 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 SMB8J28CA-E3/5B part is unused and in its original packaging.
Return procedure for SMB8J28CA-E3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J28CA-E3/5B Tags
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