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Vishay General Semiconductor - Diodes Division SMBJ28CAHM3_A/H
- Part No.:
- SMBJ28CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ28CAHM3_A/H.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:725
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Product details
Overview
SMBJ28CAHM3_A/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 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 (10/1000 µs waveform), used to protect MOSFETs, ICs, and sensor signal lines in industrial and telecom equipment.
For engineers reviewing the SMBJ28CAHM3_A/H datasheet, SMBJ28CAHM3_A/H pinout, SMBJ28CAHM3_A/H application, or SMBJ28CAHM3_A/H equivalent, key selection criteria include bidirectional clamping capability, low clamping ratio (VC/VWM ≈ 1.62), AEC-Q101 qualification status, halogen-free RoHS compliance (HM3 suffix), and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This device operates as a voltage-clamping protector using an avalanche junction structure, responding in <1 ps to transient overvoltages. Its bidirectional symmetry ensures identical electrical behavior in both polarities, eliminating polarity-dependent layout constraints in AC-coupled or differential signal paths.
Thermal performance is defined by RθJA = 100 °C/W and RθJL = 20 °C/W, with derating required above TA = 25 °C per Figure 2. The 150 °C maximum junction temperature and MSL Level 1 rating support reflow soldering at 260 °C peak.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - Maximum continuous reverse operating voltage before clamping begins; defines safe signal swing range. |
| VBR min/max | 31.1 V / 34.4 V at IT = 1 mA - Confirmed breakdown threshold window; ensures predictable turn-on under surge conditions. |
| 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; supports robust protection against lightning-induced or inductive-switching transients. |
| ID @ VWM | 1.0 µA - Reverse leakage at stand-off voltage; negligible loading on 28 V bias rails or high-impedance sensor interfaces. |
| TJ max. | +150 °C - Maximum junction temperature; enables operation in under-hood automotive or enclosed industrial enclosures. |
| Package | SMB (DO-214AA) - Standardized surface-mount outline with 5.59 mm × 4.06 mm footprint and 2.20 mm height; compatible with JEDEC MS-012AC. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking. Terminals are matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102, meeting JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative half-cycle) | Conducts surge current during negative voltage excursions; forms symmetrical clamping path with cathode. |
| Cathode | Transient current entry (positive half-cycle) | Conducts surge current during positive voltage excursions; paired with anode to enable bidirectional protection without external polarity management. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals, differential buses (e.g., RS-485), or ungrounded power rails without polarity awareness. |
| 600 W peak pulse power (10/1000 µs) | Withstands high-energy transients common in industrial motor drives and telecom line interfaces without degradation. |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive applications including body electronics and infotainment power domains requiring reliability certification. |
| Halogen-free & RoHS-compliant | Meets environmental compliance requirements for consumer, medical, and export-regulated electronics manufacturing. |
| MSL Level 1, 260 °C peak reflow | Supports standard lead-free SMT assembly without moisture sensitivity concerns or baking preconditioning. |
Applications
| Industrial Motor Drive Control | Automotive Body Control Module (BCM) |
|---|---|
|
Use Scenario: Protection of gate drivers and microcontroller I/O pins from inductive kickback during MOSFET switching in 24 V DC motor control circuits. IC Role / Device Role / Timing Role: Voltage clamping element placed across power supply rails and signal lines to limit transient overshoot below IC absolute maximum ratings. Use Value: Prevents latch-up or permanent damage to 3.3 V/5 V logic interfaces when subjected to >100 V spikes from relay coil de-energization. |
Use Scenario: Surge suppression on LIN bus lines and power inputs of BCM modules exposed to load dump and jump-start events. IC Role / Device Role / Timing Role: Bidirectional transient suppressor connected between LIN signal and ground, and between VBAT and ground. Use Value: Maintains signal integrity during ISO 7637-2 Pulse 1/2a/5a tests while meeting AEC-Q101 qualification for automotive deployment. |
| Telecom Power Interface | Consumer Sensor Signal Line |
|
Use Scenario: Input stage protection on 48 V PoE-powered Ethernet switches and base station power supplies subject to lightning-induced surges. IC Role / Device Role / Timing Role: Primary TVS device placed at board edge before DC-DC converter input, shunting surge energy to chassis ground. Use Value: Limits clamped voltage to 45.4 V, ensuring downstream 50 V-rated input capacitors and controllers remain within safe operating area. |
Use Scenario: ESD and EFT protection on analog output lines of MEMS pressure sensors in smart home appliances. IC Role / Device Role / Timing Role: Low-leakage (1.0 µA) bidirectional clamp placed directly at connector interface to minimize trace inductance. Use Value: Provides ±15 kV contact / ±20 kV air ESD immunity per IEC 61000-4-2 while adding <0.5 pF parasitic capacitance at 0 V bias. |
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_A/H | Same electrical specs, but RoHS-compliant commercial grade (E3) without halogen-free certification. | Lacks halogen-free compliance; suitable for non-regulated commercial products where material content is not restricted. | Select SMBJ28CAHE3_A/H only if halogen-free requirement is waived and cost optimization is prioritized. |
| SMAJ28CAHM3_A/H | Lower 400 W PPPM rating, 50.4 V VC at 8.3 A IPPM, SMA (DO-214AC) package with smaller 4.5 mm × 2.7 mm footprint. | Reduced surge handling margin; appropriate for space-constrained designs with lower transient energy exposure. | Choose SMAJ28CAHM3_A/H only when PCB area is critical and system-level surge testing confirms 400 W adequacy. |
Compared with SMBJ28CAHM3_A/H, SMBJ28CAHE3_A/H offers identical protection performance without halogen-free assurance, while SMAJ28CAHM3_A/H trades 33 % lower peak power handling and higher clamping voltage for 30 % smaller board area-requiring explicit validation against IEC 61000-4-5 test levels.
Availability
SMBJ28CAHM3_A/H is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and telecom power interfaces requiring stable component supply with halogen-free and AEC-Q101-compliant TVS protection.
Supply support for SMBJ28CAHM3_A/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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMBJ series is engineered for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom systems where robustness against inductive switching and lightning surges is mandatory.
FAQ
What is the clamping voltage of SMBJ28CAHM3_A/H at its rated peak pulse current?
The SMBJ28CAHM3_A/H has a maximum clamping voltage (VC) of 45.4 V at 13.2 A peak pulse current (IPPM), measured under the standardized 10/1000 µs waveform. This value defines the upper voltage limit imposed on protected circuitry during surge events and is confirmed in the Vishay datasheet Document Number 88392, Table on page 2. The SMBJ28CAHM3_A/H maintains this clamping performance across its specified operating temperature range.
Is SMBJ28CAHM3_A/H suitable for automotive applications?
Yes, SMBJ28CAHM3_A/H is AEC-Q101 qualified (indicated by the HM3 suffix), making it suitable for automotive applications such as body control modules, infotainment power rails, and LIN bus protection. It meets the stress test requirements for temperature cycling, humidity, and mechanical shock defined in AEC-Q101. The SMBJ28CAHM3_A/H also supports lead-free reflow up to 260 °C and carries halogen-free RoHS compliance for modern vehicle platforms.
What does the "CA" suffix indicate in SMBJ28CAHM3_A/H?
The "CA" suffix in SMBJ28CAHM3_A/H denotes a bidirectional configuration, meaning the device provides symmetrical transient voltage suppression for both positive and negative polarity transients. Unlike unidirectional variants (e.g., SMBJ28AHM3_A/H), the SMBJ28CAHM3_A/H has no cathode band marking and exhibits identical VBR, VC, and IPPM characteristics in either direction-ideal for AC signal lines, differential interfaces, or floating power domains.
How does SMBJ28CAHM3_A/H compare to SMAJ28CAHM3_A/H in terms of surge handling?
SMBJ28CAHM3_A/H delivers 600 W peak pulse power (PPPM) with a clamping voltage of 45.4 V at 13.2 A, whereas SMAJ28CAHM3_A/H is rated for 400 W PPPM and clamps at 50.4 V at 8.3 A. The SMBJ28CAHM3_A/H's larger SMB (DO-214AA) package enables higher thermal dissipation and superior surge endurance. This makes SMBJ28CAHM3_A/H preferable for applications exposed to IEC 61000-4-5 Level 3 or higher surge tests.
What is the maximum reverse leakage current for SMBJ28CAHM3_A/H at its stand-off voltage?
The SMBJ28CAHM3_A/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 low leakage ensures minimal power loss and signal interference in high-impedance sensor interfaces or battery-powered systems. The value is specified in the Electrical Characteristics table of the Vishay datasheet (Document Number 88392, page 2) and remains stable across the full -55 °C to +150 °C operating junction temperature range.
SMBJ28CAHM3_A/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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_A/H FAQ
1.How can I place an order for SMBJ28CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ28CAHM3_A/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_A/H reliable?
The price and inventory of SMBJ28CAHM3_A/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_A/H is usually 5 days.
3.What payment methods are accepted for SMBJ28CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ28CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ28CAHM3_A/H?
SMBJ28CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ28CAHM3_A/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_A/H?
For technical support, including SMBJ28CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ28CAHM3_A/H requirements.
6.How does Aetrix verify that SMBJ28CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMBJ28CAHM3_A/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_A/H meets industry standards.
7.What is the process for return or replacement of SMBJ28CAHM3_A/H?
All SMBJ28CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ28CAHM3_A/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_A/H part is unused and in its original packaging.
Return procedure for SMBJ28CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ28CAHM3_A/H Tags
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