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Vishay General Semiconductor - Diodes Division SMBJ28CAHM3_B/I
- Part No.:
- SMBJ28CAHM3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ28CAHM3_B/I.pdf
- Description:
- 600W,28V,5%,BIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:2,589
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Product details
Overview
SMBJ28CAHM3_B/I 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 power and signal lines. It features a 28 V standoff voltage (VWM), 31.1–34.4 V breakdown range (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, sensor interfaces, and industrial I/O circuits against ESD and inductive switching surges.
For engineers reviewing the SMBJ28CAHM3_B/I datasheet, SMBJ28CAHM3_B/I pinout, SMBJ28CAHM3_B/I application, or SMBJ28CAHM3_B/I equivalent, this device is evaluated for bidirectional surge protection in automotive-grade commercial designs requiring halogen-free, RoHS-compliant, AEC-Q101 qualified components with MSL Level 1 moisture sensitivity and 150 °C junction temperature capability.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, delivering identical clamping performance regardless of transient polarity. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 µA at VWM), while the low incremental surge resistance enables precise voltage limiting during fast-rising transients up to 10/1000 µs.
The device is rated for repetitive surge duty cycle of 0.01 % and derates linearly above 25 °C ambient per Fig. 2, with thermal resistance of 100 °C/W (junction-to-ambient) and 20 °C/W (junction-to-lead). It meets UL 497B recognition (QVGQ2) and complies with ANSI/IEEE C62.35 surge standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - Maximum continuous reverse operating voltage before conduction begins; defines safe operating margin below clamping threshold. |
| VBR (min/max) | 31.1 V / 34.4 V at 1 mA - Confirmed breakdown range ensuring reliable turn-on under surge conditions without premature conduction. |
| VC @ IPPM | 45.4 V at 13.2 A - Clamped voltage during 600 W 10/1000 µs transient; determines protected circuit's maximum stress level. |
| PPPM | 600 W - Peak pulse power handling capacity; validates robustness against lightning-induced or inductive-switching surges. |
| TJ max | +150 °C - Maximum junction temperature; supports operation in under-hood automotive and high-temperature industrial environments. |
| Package | SMB (DO-214AA) - Standardized surface-mount outline with 5.59 mm × 4.06 mm footprint and 2.20 mm height; compatible with automated placement. |
| AEC-Q101 | Qualified - Validated for automotive electronic systems per stress test requirements including HTOL, TCT, and ESD HBM/MM. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking - symmetrical terminal arrangement for AC-coupled or floating-line protection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient conduction path | Both terminals function identically; bidirectional clamping occurs regardless of voltage polarity applied across the device. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC lines, differential buses, or ungrounded signal paths without polarity concerns. |
| 600 W peak pulse power (10/1000 µs) | Supports IEC 61000-4-5 Level 3/4 surge immunity testing in industrial and telecom equipment. |
| Halogen-free, RoHS-compliant (HM3 suffix) | Fulfills environmental compliance for global OEM programs and eliminates corrosive off-gassing in sealed enclosures. |
| MSL Level 1 (260 °C peak reflow) | Permits standard lead-free SMT assembly without pre-baking or special handling protocols. |
| Low leakage (<1.0 µA at VWM) | Minimizes standby power loss and avoids false triggering in high-impedance sensor or battery-powered circuits. |
Applications
| Industrial Motor Control I/O Protection | Automotive Body Control Module (BCM) Power Rails |
|---|---|
Use Scenario: Protecting PLC digital input modules from inductive kickback when switching solenoids or relays. IC Role / Device Role / Timing Role: Bidirectional TVS placed across input terminals to clamp ±1 kV surge events induced by contactor switching. Use Value: Limits transient voltage to ≤45.4 V, preventing damage to upstream optocouplers and microcontroller GPIOs rated for 3.3 V or 5 V logic. |
Use Scenario: Safeguarding 12 V supply lines feeding microcontrollers and CAN transceivers in door module electronics. IC Role / Device Role / Timing Role: Primary overvoltage clamp on battery-fed rails subject to load dump (ISO 7637-2 Pulse 5a) and jump-start transients. Use Value: Withstands 600 W surges and maintains <1.0 µA leakage at 28 V, enabling direct placement without degrading sleep-mode current budgets. |
| Telecom Ethernet PHY Interface Protection | Consumer Appliance Sensor Signal Lines |
Use Scenario: Shielding RJ45 magnetics secondary side and PHY IC pins from ESD and lightning-induced surges in PoE-powered switches. IC Role / Device Role / Timing Role: Bidirectional TVS connected line-to-line and line-to-ground on 10/100BASE-TX differential pairs. Use Value: Symmetrical clamping ensures equal protection for both polarities of fast-rising transients, preserving signal integrity up to 100 MHz. |
Use Scenario: Guarding NTC thermistor or Hall-effect sensor outputs in washing machine control boards exposed to relay noise. IC Role / Device Role / Timing Role: Low-capacitance TVS placed directly at sensor connector to suppress sub-100 ns EFT bursts per IEC 61000-4-4. Use Value: Fast response time and 45.4 V clamping prevent latch-up or ADC saturation in 3.3 V analog front-end circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ28CAHE3_B/I | RoHS-compliant but not halogen-free; same electrical specs and AEC-Q101 qualification. | Preferred where halogen content is unrestricted but automotive qualification is required. | Select when cost optimization is prioritized over halogen-free material compliance. |
| SMAJ28CAHM3 | Lower 400 W PPPM, SMA package (smaller footprint, higher RθJA = 140 °C/W). | Suitable only for lower-energy transients or space-constrained PCBs with adequate thermal relief. | Choose only if board area is critical and surge threat level is limited to IEC 61000-4-2 Level 4 (±15 kV air). |
Compared with SMBJ28CAHM3_B/I, SMBJ28CAHE3_B/I offers identical surge performance with non-halogen-free construction, while SMAJ28CAHM3 reduces peak power handling by 33 % and increases thermal resistance - making the original SMBJ28CAHM3_B/I optimal for high-reliability automotive and industrial applications demanding full 600 W capability and halogen-free compliance.
Availability
SMBJ28CAHM3_B/I is available at Aetrix Electronics and suitable for industrial motor drives, automotive body electronics, and telecom infrastructure requiring stable component supply with guaranteed long-term manufacturability and traceable sourcing.
Supply support for SMBJ28CAHM3_B/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 power MOSFETs with emphasis on reliability, efficiency, and application-specific performance.
The SMBJ series is engineered for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom systems where AEC-Q101 qualification, halogen-free materials, and consistent clamping behavior are mandatory design requirements.
FAQ
What is the clamping voltage of SMBJ28CAHM3_B/I at its rated peak pulse current?
The SMBJ28CAHM3_B/I has a maximum clamping voltage (VC) of 45.4 V at 13.2 A peak pulse current (IPPM) under 10/1000 µs waveform conditions. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during surge events. The SMBJ28CAHM3_B/I maintains this clamping performance bidirectionally, ensuring consistent protection regardless of transient polarity.
Is SMBJ28CAHM3_B/I qualified for automotive applications?
Yes, SMBJ28CAHM3_B/I is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HM3_B/I", where "HM3" denotes halogen-free, RoHS-compliant, and AEC-Q101 qualified construction. It undergoes stress testing including high-temperature operating life, temperature cycling, and ESD per automotive reliability standards - making SMBJ28CAHM3_B/I suitable for use in body control modules, infotainment power supplies, and sensor interfaces in passenger vehicles.
What does the "CA" suffix indicate in SMBJ28CAHM3_B/I?
The "CA" suffix in SMBJ28CAHM3_B/I explicitly denotes a bidirectional configuration, meaning the device provides symmetrical transient suppression for both positive and negative voltage excursions. Unlike unidirectional variants (e.g., SMBJ28A), SMBJ28CAHM3_B/I has no cathode marking and delivers identical VBR, VC, and IPPM characteristics in either direction - essential for protecting AC-coupled lines, differential signals, or floating ground systems where polarity is undefined.
How does the HM3 packaging differ from E3 in SMBJ28CAHM3_B/I?
The "HM3" suffix in SMBJ28CAHM3_B/I specifies halogen-free, RoHS-compliant construction with matte tin-plated leads meeting JESD 201 Class 2 whisker resistance, whereas "E3" indicates RoHS-compliant but non-halogen-free molding compound. Both share identical electrical specifications and AEC-Q101 qualification, but SMBJ28CAHM3_B/I meets stricter environmental mandates for automotive and green electronics programs where brominated flame retardants are prohibited.
What is the maximum operating temperature for SMBJ28CAHM3_B/I?
The SMBJ28CAHM3_B/I has a maximum junction temperature (TJ) of +150 °C and an operating ambient range of –55 °C to +150 °C. This rating is validated under derated power conditions per Figure 2 of the datasheet and supports deployment in engine bay electronics, industrial inverters, and outdoor telecom equipment. The SMBJ28CAHM3_B/I maintains specified VBR and leakage performance across this full range when mounted per recommended pad layout.
SMBJ28CAHM3_B/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:
- 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):
- 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_B/I FAQ
1.How can I place an order for SMBJ28CAHM3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ28CAHM3_B/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_B/I reliable?
The price and inventory of SMBJ28CAHM3_B/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_B/I is usually 5 days.
3.What payment methods are accepted for SMBJ28CAHM3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ28CAHM3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ28CAHM3_B/I?
SMBJ28CAHM3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ28CAHM3_B/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_B/I?
For technical support, including SMBJ28CAHM3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ28CAHM3_B/I requirements.
6.How does Aetrix verify that SMBJ28CAHM3_B/I is sourced from the original manufacturer or authorized distributors?
All SMBJ28CAHM3_B/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_B/I meets industry standards.
7.What is the process for return or replacement of SMBJ28CAHM3_B/I?
All SMBJ28CAHM3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ28CAHM3_B/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_B/I part is unused and in its original packaging.
Return procedure for SMBJ28CAHM3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ28CAHM3_B/I Tags
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