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Vishay General Semiconductor - Diodes Division SMBJ28CAHM3_B/H
- Part No.:
- SMBJ28CAHM3_B/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ28CAHM3_B/H.pdf
- Description:
- 600W,28V,5%,BIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:5,987
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Product details
Overview
SMBJ28CAHM3_B/H 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 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 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 interfaces in industrial motor drives.
For engineers reviewing the SMBJ28CAHM3_B/H datasheet, SMBJ28CAHM3_B/H pinout, SMBJ28CAHM3_B/H application, or SMBJ28CAHM3_B/H equivalent, this device is evaluated for ESD and surge protection in bidirectional AC-coupled lines, automotive body electronics, and telecom interface circuits where low clamping voltage and fast response (<1 ns) are critical.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with identical VBR min/max (31.1 V / 34.4 V), VC (45.4 V), and IPPM (13.2 A) in either direction. Its glass-passivated junction ensures stable leakage (<1.0 µA at VWM) and robust surge handling up to 100 A IFSM (unidirectional only, not applicable here).
The device complies with AEC-Q101 qualification (via HM3 suffix), supports MSL Level 1 reflow (260 °C peak), and exhibits a temperature coefficient of VBR at +0.098 %/°C - enabling predictable clamping behavior over -55 °C to +150 °C operating range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - maximum continuous reverse working voltage before clamping initiates; defines safe operating margin for 24 V nominal systems. |
| VBR (min/max) | 31.1 V / 34.4 V at 1 mA - guaranteed breakdown threshold range; ensures reliable turn-on before downstream component damage. |
| VC @ IPPM | 45.4 V at 13.2 A - clamped voltage during 10/1000 µs surge; limits stress on protected ICs to sub-46 V under worst-case transient. |
| PPPM | 600 W - peak pulse power rating with 10/1000 µs waveform; supports IEC 61000-4-5 Level 4 (4 kV) surge immunity when properly laid out. |
| ID @ VWM | <1.0 µA - ultra-low reverse leakage at stand-off voltage; avoids signal distortion or bias shift in high-impedance sensor lines. |
| TJ max. | +150 °C - maximum junction temperature; enables use in under-hood automotive modules and enclosed industrial enclosures. |
| Package | SMB (DO-214AA) - standardized 2-pin SMD outline with 5.21 mm × 4.06 mm footprint; compatible with automated pick-and-place and reflow. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking - terminals are symmetrical and interchangeable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional transient conduction path | Either terminal serves as anode or cathode depending on instantaneous polarity; no band marking required per datasheet. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables single-device protection against IEC 61000-4-5 surges up to 4 kV in properly decoupled 24 V systems. |
| 45.4 V clamping voltage at 13.2 A | Provides ≥17 V headroom below typical 60 V absolute maximum ratings of industrial-grade microcontrollers and gate drivers. |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive body control modules, lighting drivers, and infotainment interfaces requiring long-term reliability. |
| MSL Level 1, 260 °C peak reflow | Supports standard lead-free reflow profiles without preconditioning; eliminates moisture sensitivity handling overhead. |
| Halogen-free & RoHS-compliant | Fulfills EU RoHS Directive 2011/65/EU and JEDEC J-STD-020 requirements for green manufacturing and end-of-life compliance. |
Applications
| Industrial Motor Drives | Automotive Body Electronics |
|---|---|
Use Scenario: Protection of gate driver inputs and feedback sensing lines against inductive kickback from BLDC motor phase switching. IC Role / Device Role / Timing Role: Bidirectional clamping element placed directly at connector entry or IC input pins to shunt transients before propagation. Use Value: Limits voltage excursions to ≤45.4 V during 13.2 A surges, preserving integrity of 3.3 V/5 V logic interfaces and analog comparators. |
Use Scenario: Surge suppression on LIN bus lines and interior lighting control signals exposed to load dump and battery reversal events. IC Role / Device Role / Timing Role: Standoff-clamp TVS deployed across differential pairs or single-ended lines to absorb repetitive 100 V/50 ms transients. Use Value: Maintains <1.0 µA leakage at 28 V VWM, preventing false wake-up or current drain in always-on vehicle modules. |
| Telecom Interface Circuits | Industrial Sensor Signal Conditioning |
Use Scenario: Protection of RS-485 transceiver I/O pins against ESD (IEC 61000-4-2) and lightning-induced surges on outdoor data links. IC Role / Device Role / Timing Role: First-line defense mounted adjacent to connector, operating in symmetrical mode to handle ±28 V common-mode swings. Use Value: Clamps within <1 ns to 45.4 V, ensuring transceiver survival under 4 kV contact discharge while preserving signal integrity. |
Use Scenario: Guarding 4–20 mA current loop inputs and thermocouple amplifier front-ends against field wiring faults and electrostatic discharge. IC Role / Device Role / Timing Role: Low-capacitance (typ. 100 pF at 0 V) bidirectional clamp placed before precision op-amp inputs. Use Value: Adds negligible loading (<1 µA leakage) while limiting fault voltage to safe levels for rail-to-rail input amplifiers. |
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/H | Same electrical specs, but RoHS-compliant commercial grade (E3) without halogen-free certification or AEC-Q101 qualification. | Approved for industrial and consumer equipment; not validated for automotive under-hood environments. | Select when AEC-Q101 and halogen-free compliance are not required, and cost optimization is prioritized. |
| SMAJ28CA | Lower 400 W PPPM rating, higher 53.3 V VC at 7.5 A IPPM, SMA (DO-214AC) package with smaller 4.57 mm × 2.92 mm footprint. | Suitable for space-constrained designs with lower surge immunity requirements (e.g., IEC 61000-4-5 Level 2). | Choose when board area is limited and 600 W surge capacity is unnecessary; verify thermal derating due to higher RθJA. |
Compared with SMBJ28CAHM3_B/H, SMBJ28CAHE3_B/H omits automotive qualification and halogen-free status but matches all electrical parameters, while SMAJ28CA trades surge robustness and thermal performance for reduced PCB footprint - making each suitable for distinct reliability or layout constraints.
Availability
SMBJ28CAHM3_B/H is available at Aetrix Electronics and suitable for industrial motor drives, automotive body electronics, and telecom interface circuits requiring stable component supply with AEC-Q101 validation and halogen-free compliance.
Supply support for SMBJ28CAHM3_B/H 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, and protection devices with emphasis on reliability, efficiency, and application-specific performance.
The SMBJ series targets high-energy transient suppression in harsh environments - engineered for automotive, industrial, and telecom systems where consistent clamping, low leakage, and AEC-Q101 validation are mandatory.
FAQ
What is the clamping voltage of SMBJ28CAHM3_B/H at its rated peak pulse current?
The SMBJ28CAHM3_B/H has a maximum clamping voltage (VC) of 45.4 V at 13.2 A peak pulse current (IPPM) under the standard 10/1000 µs waveform. This value is measured per Figure 1 in Vishay document 88392 and defines the upper voltage limit imposed on protected circuitry during surge events - critical for ensuring compatibility with 48 V system rails and 60 V-rated ICs.
Is SMBJ28CAHM3_B/H suitable for automotive applications?
Yes, SMBJ28CAHM3_B/H is AEC-Q101 qualified (denoted by the HM3 suffix) and rated for operation from -55 °C to +150 °C. It is specifically intended for automotive body electronics, lighting control, and infotainment interfaces where validated reliability, halogen-free construction, and MSL Level 1 reflow compatibility are required - confirmed in Vishay's ordering information table on page 3 of document 88392.
How does the bidirectional design of SMBJ28CAHM3_B/H affect its installation?
The SMBJ28CAHM3_B/H has no polarity marking and uses symmetrical terminals - either end functions identically regardless of voltage polarity. This eliminates orientation concerns during placement and simplifies layout for AC-coupled or differential signal lines. Unlike unidirectional variants (e.g., SMBJ28A), it requires no cathode band alignment, reducing assembly error risk in high-volume manufacturing.
What is the maximum reverse leakage current for SMBJ28CAHM3_B/H at its stand-off voltage?
The SMBJ28CAHM3_B/H exhibits a maximum reverse leakage current (ID) of 1.0 µA at its 28 V stand-off voltage (VWM), measured at TA = 25 °C. This ultra-low leakage preserves signal integrity in high-impedance sensor interfaces and prevents excessive quiescent current in always-on automotive modules - a key parameter verified in the Electrical Characteristics table on page 2 of Vishay document 88392.
Does SMBJ28CAHM3_B/H meet UL recognition standards?
Yes, SMBJ28CAHM3_B/H carries Underwriters Laboratories recognition under UL 497B (file E136766) for both unidirectional and bidirectional transient protectors. This certification confirms compliance with safety requirements for telecommunications and industrial equipment - explicitly noted in the "Notes" section on page 2 of Vishay document 88392 with the (+) symbol prefixing the SMBJ28CA row.
SMBJ28CAHM3_B/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Bulk
- 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/H FAQ
1.How can I place an order for SMBJ28CAHM3_B/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ28CAHM3_B/H 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/H reliable?
The price and inventory of SMBJ28CAHM3_B/H 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/H is usually 5 days.
3.What payment methods are accepted for SMBJ28CAHM3_B/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ28CAHM3_B/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ28CAHM3_B/H?
SMBJ28CAHM3_B/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ28CAHM3_B/H 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/H?
For technical support, including SMBJ28CAHM3_B/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ28CAHM3_B/H requirements.
6.How does Aetrix verify that SMBJ28CAHM3_B/H is sourced from the original manufacturer or authorized distributors?
All SMBJ28CAHM3_B/H 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/H meets industry standards.
7.What is the process for return or replacement of SMBJ28CAHM3_B/H?
All SMBJ28CAHM3_B/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ28CAHM3_B/H, 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/H part is unused and in its original packaging.
Return procedure for SMBJ28CAHM3_B/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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