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Vishay General Semiconductor - Diodes Division SMBJ28CAHE3_B/I
- Part No.:
- SMBJ28CAHE3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ28CAHE3_B/I.pdf
- Description:
- 600W,28V 5%,BIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:2,104
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Product details
Overview
SMBJ28CAHE3_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 signal or 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 capability with 10/1000 µs waveform - used to protect MOSFETs, ICs, and sensor signal lines in industrial and telecom equipment.
For engineers reviewing the SMBJ28CAHE3_B/I datasheet, SMBJ28CAHE3_B/I pinout, SMBJ28CAHE3_B/I application, or SMBJ28CAHE3_B/I equivalent, key selection considerations include bidirectional surge suppression capability, AEC-Q101 qualification status, clamping performance under 10/1000 µs transients, thermal resistance (RθJA = 100 °C/W), and RoHS-compliant matte tin-plated terminals suitable for J-STD-002 soldering.
Technical Context
This device operates as a voltage-clamping protector with symmetrical avalanche breakdown in both directions, enabling transient suppression on AC-coupled or floating lines without polarity concerns. Its glass-passivated junction ensures stable VBR tolerance and low leakage (<1.0 µA at VWM), while the low incremental surge resistance supports fast energy diversion during ESD or lightning-induced surges.
The SMBJ28CAHE3_B/I is rated for -55 °C to +150 °C operating junction temperature, meets MSL Level 1 per J-STD-020 (260 °C peak reflow), and is qualified to AEC-Q101 for automotive-grade reliability. Its 100 °C/W junction-to-ambient thermal resistance requires appropriate PCB copper pad area (0.2" × 0.2") for full 600 W pulse rating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - Maximum continuous reverse working voltage before clamping begins; defines safe operating margin below breakdown. |
| VBR min/max | 31.1 V / 34.4 V at IT = 1 mA - Confirmed bidirectional breakdown range; ensures predictable turn-on across manufacturing lot. |
| VC @ IPPM | 45.4 V at 13.2 A - Clamped voltage during 10/1000 µs surge; determines maximum stress imposed on protected downstream circuitry. |
| PPPM | 600 W - Peak pulse power handling with 10/1000 µs waveform; validates robustness against IEC 61000-4-5 level 4 surges. |
| ID @ VWM | <1.0 µA - Reverse leakage at stand-off voltage; critical for low-power sensor or battery-backed circuits. |
| TJ max | +150 °C - Maximum junction temperature; enables use in under-hood automotive or high-ambient industrial environments. |
| RθJA | 100 °C/W - Thermal resistance junction-to-ambient on standard 0.2" × 0.2" pads; guides PCB thermal design for sustained surge duty. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking. Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H); matte tin-plated terminals compliant with J-STD-002.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; common node in bidirectional operation | Connected to line being protected; forms symmetrical avalanche path with cathode during either polarity transient. |
| Cathode | Current exit terminal in forward bias; common node in bidirectional operation | Connected to line being protected; identical electrical role to anode due to bidirectional symmetry; no band marking. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables compliance with IEC 61000-4-5 surge immunity requirements up to 4 kV (line-earth) in properly designed systems. |
| AEC-Q101 qualified | Validated for automotive applications including body control modules and infotainment interfaces requiring extended temperature and life-cycle reliability. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow profile (peak 260 °C), eliminating bake requirements prior to assembly. |
| Glass passivated junction | Provides stable VBR over time and temperature, low leakage, and resistance to humidity-induced parameter drift. |
| RoHS-compliant & halogen-free option available | Meets global environmental regulations (EU RoHS, JEDEC J-STD-20) and supports green manufacturing initiatives. |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Protecting gate drivers and feedback signal lines from inductive kickback during MOSFET/IGBT switching in variable-frequency drives. IC Role / Device Role / Timing Role: Bidirectional clamping element placed across motor phase outputs or isolated analog sensing paths. Use Value: Limits transient voltage to ≤45.4 V, preventing latch-up or oxide breakdown in 3.3 V/5 V interface ICs and microcontrollers. |
Use Scenario: Safeguarding LIN bus transceivers and door module sensors against load dump and jump-start surges in 12 V vehicle networks. IC Role / Device Role / Timing Role: Primary line-side TVS on LIN data line and power input pins of BCM subassemblies. Use Value: Withstands repetitive 600 W pulses and maintains <1.0 µA leakage at 28 V, preserving bus idle-state integrity and sleep-mode current budgets. |
| Telecom Power Supply Inputs | Consumer Sensor Signal Conditioning |
|
Use Scenario: Suppressing AC-line coupled surges and lightning-induced transients on 48 V DC input rails of PoE-powered network switches. IC Role / Device Role / Timing Role: Secondary-stage TVS after bulk MOVs, providing precise clamping before DC-DC converters and PMICs. Use Value: 31.1–34.4 V VBR aligns with 48 V system derating margins; 45.4 V VC ensures downstream 36 V-rated regulators remain within safe SOA. |
Use Scenario: Shielding I²C/SPI lines of MEMS accelerometers and environmental sensors from ESD events in handheld devices and smart home hubs. IC Role / Device Role / Timing Role: Localized TVS placed adjacent to sensor IC package pins, minimizing trace inductance for sub-nanosecond response. Use Value: Sub-1 µA leakage at 28 V prevents signal offset errors in high-impedance analog front-ends; SMB footprint enables dense layout near sensor die. |
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-E3/52 | No AEC-Q101 qualification; commercial-grade only; same electrical specs and SMB package. | Limited to non-automotive industrial or consumer use where automotive reliability certification is not required. | Select when cost sensitivity outweighs automotive qualification needs and full lifecycle support is not mandated. |
| SAC28CA | Same VWM/VBR/VC ratings but in SOD-123FL package; lower PPPM (400 W); higher RθJA (150 °C/W). | Better suited for space-constrained, low-power applications where 600 W surge capacity is unnecessary. | Choose for compact designs with moderate surge exposure and where PCB real estate limits SMB placement. |
Compared with SMBJ28CAHE3_B/I, the SMBJ28CA-E3/52 offers identical protection performance without automotive qualification, while SAC28CA trades surge robustness and thermal performance for smaller footprint - making SMBJ28CAHE3_B/I optimal for AEC-Q101–required, high-energy transient environments.
Availability
SMBJ28CAHE3_B/I is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and telecom power supply inputs requiring stable component supply, long-term lifecycle assurance, and AEC-Q101–validated reliability.
Supply support for SMBJ28CAHE3_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, MOSFETs, and protection devices with emphasis on high-reliability, high-efficiency solutions.
The SMBJ series delivers standardized, high-power TVS protection in surface-mount packages for industrial, automotive, and telecom applications where repeatable clamping and AEC-Q101 compliance are essential.
FAQ
What does the "HE3" suffix indicate in SMBJ28CAHE3_B/I?
The "HE3" suffix in SMBJ28CAHE3_B/I denotes RoHS-compliant construction with AEC-Q101 qualification. It confirms that the device meets automotive-grade reliability standards including temperature cycling, humidity testing, and lifetime validation - distinct from commercial-grade "E3" variants. SMBJ28CAHE3_B/I is fully traceable to Vishay's qualified automotive production line.
Is SMBJ28CAHE3_B/I unidirectional or bidirectional?
SMBJ28CAHE3_B/I is a bidirectional TVS diode, as confirmed by the "CA" suffix in its part number. It provides symmetrical clamping for both positive and negative transients without polarity dependence, making it suitable for AC lines, differential buses, or floating signal paths. Unlike unidirectional variants (e.g., SMBJ28A), it has no cathode band marking.
What is the maximum clamping voltage of SMBJ28CAHE3_B/I and under what test condition?
The maximum clamping voltage (VC) of SMBJ28CAHE3_B/I is 45.4 V, measured at a peak pulse current (IPPM) of 13.2 A using the standardized 10/1000 µs double-exponential waveform. This value defines the upper voltage limit imposed on protected circuitry during worst-case surge events and is validated per ANSI/IEEE C62.35.
Does SMBJ28CAHE3_B/I require special PCB layout considerations?
Yes - to achieve its rated 600 W peak pulse power, SMBJ28CAHE3_B/I must be mounted on minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, per Vishay's datasheet Fig. 2 and thermal characterization. Smaller pads reduce heat dissipation, derating IPPM and VC performance; thermal vias under pads further improve sustained surge capability.
How does SMBJ28CAHE3_B/I differ from SMBJ28A in practical design use?
SMBJ28CAHE3_B/I is bidirectional with symmetrical clamping, while SMBJ28A is unidirectional and conducts only in reverse bias. SMBJ28CAHE3_B/I replaces SMBJ28A only when polarity-agnostic protection is needed - e.g., on AC-coupled lines or differential pairs. Using SMBJ28A in place of SMBJ28CAHE3_B/I would leave positive transients unprotected.
SMBJ28CAHE3_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)
SMBJ28CAHE3_B/I FAQ
1.How can I place an order for SMBJ28CAHE3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ28CAHE3_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 SMBJ28CAHE3_B/I reliable?
The price and inventory of SMBJ28CAHE3_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 SMBJ28CAHE3_B/I is usually 5 days.
3.What payment methods are accepted for SMBJ28CAHE3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ28CAHE3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ28CAHE3_B/I?
SMBJ28CAHE3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ28CAHE3_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 SMBJ28CAHE3_B/I?
For technical support, including SMBJ28CAHE3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ28CAHE3_B/I requirements.
6.How does Aetrix verify that SMBJ28CAHE3_B/I is sourced from the original manufacturer or authorized distributors?
All SMBJ28CAHE3_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 SMBJ28CAHE3_B/I meets industry standards.
7.What is the process for return or replacement of SMBJ28CAHE3_B/I?
All SMBJ28CAHE3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ28CAHE3_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 SMBJ28CAHE3_B/I part is unused and in its original packaging.
Return procedure for SMBJ28CAHE3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ28CAHE3_B/I Tags
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