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Vishay General Semiconductor - Diodes Division SMB8J28CAHE3/52
- Part No.:
- SMB8J28CAHE3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J28CAHE3/52.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,421
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Product details
Overview
SMB8J28CAHE3/52 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 maximum clamping voltage (VC) at 17.6 A peak pulse current (IPPM), and 800 W peak pulse power (PPPM) with 10/1000 µs waveform - deployed in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the SMB8J28CAHE3/52 datasheet, SMB8J28CAHE3/52 pinout, SMB8J28CAHE3/52 application, or SMB8J28CAHE3/52 equivalent, key selection criteria include AEC-Q101 qualification, bidirectional polarity, 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 operates as a voltage-clamped shunt protector, responding within <1 ps to transients induced by inductive switching or ESD. Its glass-passivated junction ensures stable VBR tolerance (±10%) and low incremental surge resistance, enabling consistent clamping performance across repeated surges.
Designed per ANSI/IEEE C62.35, it delivers bidirectional suppression without polarity dependency - critical for AC-coupled or differential bus lines. Thermal resistance (RθJA = 72 °C/W) and RθJL = 20 °C/W support reliable operation up to TJ = +150 °C when mounted per recommended pad layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - maximum continuous reverse operating voltage before clamping initiates |
| VBR (min/max) | 31.1 V / 34.4 V at 1 mA - defines precise breakdown threshold for predictable turn-on |
| VC @ IPPM | 45.4 V at 17.6 A - limits downstream voltage stress during 10/1000 µs surge |
| PPPM | 800 W - peak transient energy absorption capability under standardized waveform |
| ID @ VWM | 1.0 µA - ultra-low leakage preserves signal integrity in high-impedance circuits |
| TJ max. | +150 °C - enables use in under-hood automotive and industrial environments |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling and HTRB |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, matte tin-plated leads, RoHS-compliant and halogen-free (HE3 suffix), MSL Level 1 (260 °C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (marked end) | Surge return path | Bidirectional device - no functional cathode; marking omitted per spec - terminals are symmetrical |
| Anode | Surge return path | Identical to cathode in bidirectional configuration; both terminals conduct equally during either polarity transient |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive electronics including engine control units and ADAS sensor interfaces |
| Low clamping ratio (VC/VBR) | 1.39 - minimizes overvoltage exposure to protected ICs such as CAN transceivers or ADC front-ends |
| MSL Level 1 rating | Enables standard SMT reflow without baking - reduces manufacturing overhead and handling risk |
| Glass-passivated junction | Ensures long-term VBR stability and resistance to humidity-induced parameter drift |
| 800 W PPPM (bidirectional) | Supports IEC 61000-4-5 Level 3 (1 kV/2 Ω) surge immunity on 24 V industrial buses |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting LIN/CAN bus nodes and analog sensor outputs (e.g., pressure, temperature) from load-dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Shunt-type transient clamp placed directly at connector entry point, before signal conditioning circuitry. Use Value: Limits transient voltage to ≤45.4 V during 17.6 A surges, preventing latch-up or gate oxide damage in downstream MCU inputs and transceivers. | Use Scenario: Safeguarding 24 V digital input modules in programmable logic controllers against field-wiring induced surges and relay coil flyback. IC Role / Device Role / Timing Role: Primary overvoltage clamp on channel-level inputs, coordinated with series impedance and filtering. Use Value: Absorbs 800 W of transient energy without degradation, maintaining >10⁵ surge cycles per IEC 61000-4-5 compliance testing. |
| Telecom Line Interface | Consumer Appliance Motor Control |
Use Scenario: Protecting RS-485 transceivers and Ethernet PHYs in base station backhaul equipment exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Bidirectional clamping element on differential pairs, placed adjacent to connector with minimal trace length. Use Value: Symmetrical clamping ensures equal protection for both polarities of fast-rising transients, preserving signal integrity up to 10 Mbps. | Use Scenario: Shielding microcontroller GPIOs and gate drivers in washing machine motor inverters from commutation spikes. IC Role / Device Role / Timing Role: Secondary-level TVS on low-voltage control signals interfacing with high-side/low-side MOSFET drivers. Use Value: Withstands repetitive 8.3 ms half-sine surges up to 100 A (IFSM), ensuring robustness across thousands of appliance duty cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMB8J28CA-M3/52 | Halogen-free, RoHS-compliant; identical electrical specs and AEC-Q101 qualification | No functional difference - suitable where halogen-free materials are mandated by OEM specs | Select when environmental compliance requires halogen-free construction without sacrificing performance |
| SMBJ28CAHE3/52 | Higher PPPM (1000 W unidirectional only); same VWM/VBR/VC but unidirectional polarity | Not suitable for AC or bidirectional signal lines; requires polarity-aware PCB layout | Choose only for DC-biased rails where unidirectional clamping suffices and higher power margin is needed |
Compared with SMB8J28CAHE3/52, the M3 variant offers identical protection performance with halogen-free materials, while SMBJ28CAHE3/52 trades bidirectionality for +25% peak power - making the original the optimal choice for balanced AC-coupled or differential bus protection in automotive and industrial settings.
Availability
SMB8J28CAHE3/52 is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, telecom line protection, and consumer appliance motor control requiring stable component supply and AEC-Q101 assurance.
Supply support for SMB8J28CAHE3/52 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 reliability and application-specific validation.
The SMB8JxxCA family targets high-reliability transient suppression in harsh environments - engineered for automotive, industrial, and telecom systems where surge immunity, long-term stability, and process consistency are non-negotiable.
FAQ
What is the clamping voltage of SMB8J28CAHE3/52 at its rated peak pulse current?
The SMB8J28CAHE3/52 has a maximum clamping voltage (VC) of 45.4 V at 17.6 A peak pulse current (IPPM), measured using the 10/1000 µs waveform. This value ensures protected circuitry remains below critical overvoltage thresholds during standardized surge events, and is verified per ANSI/IEEE C62.35 test conditions in the Vishay datasheet revision 09-Jan-2024.
Is SMB8J28CAHE3/52 suitable for automotive applications?
Yes, SMB8J28CAHE3/52 is AEC-Q101 qualified and explicitly designated for automotive use with the HE3 suffix. It meets requirements for temperature cycling, highly accelerated life testing (HALT), and surge endurance in engine control, body electronics, and ADAS sensor subsystems - confirmed in Vishay document 88422.
What does the "HE3" suffix indicate in SMB8J28CAHE3/52?
The "HE3" suffix in SMB8J28CAHE3/52 denotes RoHS-compliant construction with AEC-Q101 qualification and standard matte tin plating. It distinguishes this automotive-grade variant from commercial-grade E3 or halogen-free HM3 versions - all sharing identical electrical characteristics and SMB (DO-214AA) packaging.
How does SMB8J28CAHE3/52 differ from unidirectional SMBJ28CAHE3/52?
SMB8J28CAHE3/52 is bidirectional with 800 W PPPM and symmetric clamping, while SMBJ28CAHE3/52 is unidirectional with 1000 W PPPM and cathode/anode polarity dependence. The SMB8J version supports AC-coupled or differential lines without orientation constraints, whereas SMBJ requires correct polarity alignment and is limited to DC-biased rails.
What is the thermal resistance of SMB8J28CAHE3/52, and how does it affect layout?
SMB8J28CAHE3/52 has a typical junction-to-ambient thermal resistance (RθJA) of 72 °C/W and junction-to-lead (RθJL) of 20 °C/W. To maintain TJ ≤ 150 °C under full 800 W surge, PCB layout must use minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal - as specified in Vishay's recommended mounting pad layout for SMB (DO-214AA).
SMB8J28CAHE3/52 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):
- 17.6A
- Power - Peak Pulse:
- 800W
- 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 (SMB)
SMB8J28CAHE3/52 FAQ
1.How can I place an order for SMB8J28CAHE3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J28CAHE3/52 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 SMB8J28CAHE3/52 reliable?
The price and inventory of SMB8J28CAHE3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J28CAHE3/52 is usually 5 days.
3.What payment methods are accepted for SMB8J28CAHE3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J28CAHE3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J28CAHE3/52?
SMB8J28CAHE3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J28CAHE3/52 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 SMB8J28CAHE3/52?
For technical support, including SMB8J28CAHE3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J28CAHE3/52 requirements.
6.How does Aetrix verify that SMB8J28CAHE3/52 is sourced from the original manufacturer or authorized distributors?
All SMB8J28CAHE3/52 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 SMB8J28CAHE3/52 meets industry standards.
7.What is the process for return or replacement of SMB8J28CAHE3/52?
All SMB8J28CAHE3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J28CAHE3/52, 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 SMB8J28CAHE3/52 part is unused and in its original packaging.
Return procedure for SMB8J28CAHE3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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