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Vishay General Semiconductor - Diodes Division SMB8J28CAHM3/I
- Part No.:
- SMB8J28CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J28CAHM3/I.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,061
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Product details
Overview
SMB8J28CAHM3/I 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 SMB8J28CAHM3/I datasheet, SMB8J28CAHM3/I pinout, SMB8J28CAHM3/I application, or SMB8J28CAHM3/I equivalent, this device delivers AEC-Q101-qualified transient suppression for bidirectional signal paths where low-leakage (<1.0 µA at VWM), fast response (<1 ns), and halogen-free RoHS compliance are required in space-constrained surface-mount designs.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, enabling protection of AC-coupled or differential data lines without polarity constraints. Its glass-passivated junction ensures stable VBR tolerance and low incremental surge resistance, while MSL Level 1 rating supports lead-free reflow up to 260 °C.
The device complies with ANSI/IEEE C62.35 surge standards and achieves 800 W peak pulse power handling under 10/1000 µs waveform when mounted on 0.2" × 0.2" copper pads. Thermal resistance is 72 °C/W (junction-to-ambient) and 20 °C/W (junction-to-lead), supporting sustained operation up to TJ = +150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - maximum continuous reverse operating voltage before clamping begins; defines safe signal swing range for protected line |
| VBR min/max | 31.1 V / 34.4 V at IT = 1 mA - tight breakdown window ensures predictable turn-on and minimal overvoltage during transients |
| VC @ IPPM | 45.4 V at IPPM = 17.6 A - clamping voltage limits downstream IC stress during 800 W surge events |
| ID @ VWM | <1.0 µA - ultra-low leakage preserves signal integrity and battery life in always-on sensor circuits |
| PPPM | 800 W (10/1000 µs) - rated surge energy absorption capacity for automotive load-dump and ESD-like transients |
| TJ max | +150 °C - enables deployment in under-hood automotive environments and industrial enclosures without derating |
| Package | SMB (DO-214AA) - industry-standard 2-pin SMD outline with 5.59 mm × 3.94 mm footprint and 2.20 mm height |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional - no polarity marking; symmetrical terminal configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (Pin 1 & Pin 2) | Bidirectional surge path | Identical terminals; current flows either direction during overvoltage - no cathode band; requires no orientation during placement |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and surge endurance per JESD22-A108 |
| Halogen-free & RoHS-compliant (HM3 suffix) | Meets IEC 61249-2-21 and JEDEC J-STD-201 Class 2 whisker resistance requirements |
| MSL Level 1 (260 °C peak) | Enables single-pass lead-free reflow without moisture sensitivity concerns or baking preconditioning |
| Glass-passivated junction | Ensures stable VBR drift & low dynamic impedance across lifetime and temperature (-55 °C to +150 °C) |
| Low clamping ratio (VC/VBR ≈ 1.37) | Minimizes overvoltage overshoot relative to breakdown threshold - critical for 3.3 V/5 V logic interface protection |
Applications
| Automotive Sensor Interface | Industrial RS-485 Bus Protection |
|---|---|
|
Use Scenario: Protecting LIN/CAN transceiver input pins and analog sensor outputs (e.g., pressure, temperature) from ISO 7637-2 pulse 1/2a/5a transients in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional clamping element placed directly at connector entry point to shunt surge energy before reaching ASIC or MCU I/O. Use Value: With 45.4 V clamping at 17.6 A and AEC-Q101 qualification, SMB8J28CAHM3/I prevents latch-up and gate oxide damage in 28 V-rated sensor signal chains. |
Use Scenario: Safeguarding full-duplex RS-485 transceivers (e.g., THVD1550) against lightning-induced surges and ground potential differences in factory automation networks. IC Role / Device Role / Timing Role: Common-mode TVS across A/B differential pair, referenced to local ground, absorbing common-mode transients without disrupting DC bias. Use Value: 800 W PPPM rating and symmetrical clamping enable robust protection of ±12 V compliant buses while maintaining signal integrity below 25 Mbps. |
| Consumer USB-C Port ESD Protection | Smart Meter Power Line Communication (PLC) |
|
Use Scenario: Secondary-level ESD protection on USB-C CC and VCONN lines where primary protection resides upstream, requiring low capacitance and sub-µA leakage. IC Role / Device Role / Timing Role: Standoff-limited TVS placed after series impedance to limit let-through voltage during IEC 61000-4-2 ±15 kV contact discharge. Use Value: 1.0 µA max ID at 28 V ensures no impact on VCONN regulation or CC detection timing; SMB footprint fits tight board spacing near connector. |
Use Scenario: Surge suppression on PLC coupler circuits (e.g., PRIME/G3-PLC) interfacing 230 VAC mains, exposed to switching transients and induced surges on distribution lines. IC Role / Device Role / Timing Role: High-power bidirectional clamp across coupling transformer secondary, diverting energy away from modem PHY and isolation barrier. Use Value: 800 W rating and 150 °C TJ max allow sustained operation in sealed meter enclosures; HM3 suffix satisfies environmental compliance for utility deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMB8J28CAHE3/I | Same electrical specs; RoHS-compliant but not halogen-free (E3 vs HM3) | Lacks halogen-free certification; acceptable for commercial, non-automotive use | Select when halogen-free requirement is not mandated and cost optimization is prioritized |
| SMAJ28CA-M3/5B | Lower PPPM (400 W), SMA package (smaller footprint, higher RθJA = 85 °C/W) | Not AEC-Q101 qualified; limited to lower-energy transients and less thermally demanding environments | Choose only for space-constrained consumer designs where 800 W surge margin is unnecessary |
Compared with SMB8J28CAHM3/I, the HE3/I variant offers identical performance without halogen-free assurance, while the SMAJ28CA-M3/5B trades 50 % peak power and automotive qualification for smaller size - making SMB8J28CAHM3/I the sole option meeting AEC-Q101, 800 W, and halogen-free requirements simultaneously.
Availability
SMB8J28CAHM3/I is available at Aetrix Electronics and suitable for automotive sensor modules, industrial communication interfaces, smart metering systems, and USB-C peripheral protection requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMB8J28CAHM3/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, MOSFETs, and protection devices with emphasis on reliability, power density, and automotive qualification.
The SMB8JxxCA family targets high-reliability bidirectional surge suppression in automotive and industrial settings, engineered specifically to meet ISO 7637-2, IEC 61000-4-5, and AEC-Q101 requirements with optimized thermal and clamping performance.
FAQ
What is the clamping voltage of SMB8J28CAHM3/I at its rated peak pulse current?
The SMB8J28CAHM3/I has a maximum clamping voltage (VC) of 45.4 V at its specified peak pulse current (IPPM) of 17.6 A, measured under the standard 10/1000 µs waveform. This value is guaranteed across temperature and ensures downstream circuitry remains within safe operating limits during surge events. The clamping behavior is symmetrical due to its bidirectional construction, and VC is validated per ANSI/IEEE C62.35 test conditions.
Is SMB8J28CAHM3/I suitable for automotive applications?
Yes, SMB8J28CAHM3/I is AEC-Q101 qualified and explicitly rated for automotive use, including engine control units, body electronics, and ADAS sensor interfaces. Its halogen-free (HM3) construction, MSL Level 1 reflow compatibility, and guaranteed operation from –55 °C to +150 °C junction temperature meet stringent automotive reliability and manufacturing requirements. The "HM3" suffix confirms full compliance with JESD201 Class 2 whisker testing and RoHS directives.
How does the SMB8J28CAHM3/I differ from unidirectional variants like SMB10J28A?
SMB8J28CAHM3/I is bidirectional with symmetrical clamping in both polarities and no cathode marking, whereas SMB10J28A is unidirectional, features a cathode band, and supports only single-polarity surge suppression. Electrically, SMB8J28CAHM3/I has lower PPPM (800 W vs 1000 W) and slightly higher VC (45.4 V vs 42.1 V), reflecting its dual-path architecture. The "8" prefix denotes 800 W rating, and "C" indicates bidirectionality - confirmed in Vishay's ordering nomenclature and datasheet tables.
What is the thermal resistance of SMB8J28CAHM3/I, and how does it affect layout design?
SMB8J28CAHM3/I has a typical junction-to-ambient thermal resistance (RθJA) of 72 °C/W and junction-to-lead (RθJL) of 20 °C/W when mounted on 0.2" × 0.2" copper pads per terminal. This means effective heat dissipation requires adequate copper area and thermal vias - especially under repeated surge conditions. Layout must follow Vishay's recommended pad dimensions (min. 0.086" × 0.060") to maintain rated PPPM and avoid thermal runaway during multi-pulse events.
Does SMB8J28CAHM3/I require orientation during PCB assembly?
No, SMB8J28CAHM3/I does not require orientation during PCB assembly because it is a bidirectional TVS diode with identical anode/cathode terminals and no polarity marking. Unlike unidirectional variants (e.g., SMB10J28A), it lacks a cathode band and functions identically regardless of placement direction - simplifying automated pick-and-place and eliminating orientation-related assembly errors in high-volume production.
SMB8J28CAHM3/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):
- 17.6A
- Power - Peak Pulse:
- 800W
- 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)
SMB8J28CAHM3/I FAQ
1.How can I place an order for SMB8J28CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J28CAHM3/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 SMB8J28CAHM3/I reliable?
The price and inventory of SMB8J28CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J28CAHM3/I is usually 5 days.
3.What payment methods are accepted for SMB8J28CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J28CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J28CAHM3/I?
SMB8J28CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J28CAHM3/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 SMB8J28CAHM3/I?
For technical support, including SMB8J28CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J28CAHM3/I requirements.
6.How does Aetrix verify that SMB8J28CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SMB8J28CAHM3/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 SMB8J28CAHM3/I meets industry standards.
7.What is the process for return or replacement of SMB8J28CAHM3/I?
All SMB8J28CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J28CAHM3/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 SMB8J28CAHM3/I part is unused and in its original packaging.
Return procedure for SMB8J28CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J28CAHM3/I Tags
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