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Vishay General Semiconductor - Diodes Division SMBJ51CAHM3/I
- Part No.:
- SMBJ51CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ51CAHM3/I.pdf
- Description:
- TVS DIODE 51VWM 82.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,658
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Product details
Overview
SMBJ51CAHM3/I from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, designed for robust overvoltage protection of sensitive electronics. It features a 51 V standoff voltage (VWM), 600 W peak pulse power (10/1000 µs), clamping voltage of 82.4 V at 7.3 A peak pulse current, and operates across –55 °C to +150 °C junction temperature - deployed on signal lines of industrial sensor units and telecom interface circuits.
For engineers reviewing the SMBJ51CAHM3/I datasheet, SMBJ51CAHM3/I pinout, SMBJ51CAHM3/I application, or SMBJ51CAHM3/I equivalent, this device is selected for bidirectional surge suppression where low clamping ratio, fast response (<1 ns), and AEC-Q101 qualification (via HM3 suffix) are critical in automotive-grade power rail and data line protection.
Technical Context
This bidirectional TVS diode operates symmetrically in both polarities, with breakdown voltage (VBR) specified at 56.7–62.7 V (min/max) under 1 mA test current. Its clamping behavior is characterized by a maximum VC of 82.4 V at IPPM = 7.3 A, yielding a clamping ratio of ~1.62 - indicating efficient voltage limiting during transients.
Thermally, it exhibits RθJA = 100 °C/W and RθJL = 20 °C/W, enabling reliable operation up to 150 °C junction temperature. The HM3 suffix confirms halogen-free, RoHS-compliant construction and AEC-Q101 qualification - validated for automotive electronics per JESD22-B102 solderability and J-STD-020 MSL Level 1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51 V - Maximum continuous reverse operating voltage before conduction begins; defines safe working margin for 48 V nominal systems. |
| VBR (min/max) | 56.7 V / 62.7 V - Breakdown occurs within this range at 1 mA; ensures consistent turn-on across production lots. |
| VC @ IPPM | 82.4 V at 7.3 A - Clamped voltage during 600 W transient; limits downstream IC stress to sub-85 V during lightning or ESD events. |
| PPPM | 600 W - Peak pulse power handling capability with 10/1000 µs waveform; supports IEC 61000-4-5 Level 4 surge immunity. |
| IPPM | 7.3 A - Peak surge current corresponding to 600 W clamping; determines minimum trace width and PCB copper area needed. |
| TJ max. | +150 °C - Maximum junction temperature; enables use in under-hood automotive environments without derating. |
| Package | SMB (DO-214AA) - Surface-mount outline with 5.59 mm × 4.06 mm footprint; compatible with standard SMT pick-and-place and reflow profiles. |
Pinout & Package
Package: SMB (DO-214AA), bidirectional configuration - no polarity marking; symmetrical terminals with identical electrical behavior in either direction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient conduction path | Both terminals serve as interchangeable surge current entry/exit points; no cathode band marking required for bidirectional operation. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Supports high-energy surges per IEC 61000-4-5 without degradation; validated for repetitive 0.01% duty cycle. |
| AEC-Q101 qualified (HM3 suffix) | Qualified for automotive applications including engine control modules and ADAS sensor interfaces per stress test requirements. |
| Halogen-free & RoHS-compliant | Meets EU Directive 2011/65/EU and JEDEC J-STD-20E; eliminates brominated flame retardants in molding compound. |
| Low clamping ratio (VC/VBR ≈ 1.62) | Minimizes voltage overshoot during clamping - critical for protecting 5 V or 3.3 V logic-level receivers downstream. |
| MSL Level 1 (260 °C peak) | Enables single-pass lead-free reflow without moisture sensitivity concerns; no baking required prior to assembly. |
Applications
| Industrial Sensor Protection | Automotive CAN Bus Interface |
|---|---|
|
Use Scenario: Protecting analog output lines of pressure/temperature sensors in factory automation PLCs exposed to relay coil flyback and motor drive noise. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed across signal and ground, absorbing ±1 kV EFT bursts without affecting 4–20 mA loop integrity. Use Value: Maintains sensor accuracy by limiting transient-induced offset shift; SMBJ51CAHM3/I's 82.4 V clamping prevents op-amp input stage saturation. |
Use Scenario: Surge suppression on CAN_H/CAN_L differential pair in automotive body control modules subjected to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Symmetrical TVS pair (one per line) referenced to chassis ground, conducting common-mode transients while preserving differential signaling. Use Value: SMBJ51CAHM3/I's AEC-Q101 rating and 150 °C TJ ensure reliability in under-dash environments; clamping holds bus voltage below transceiver damage threshold. |
| Telecom Line Interface | Power Supply Input Stage |
|
Use Scenario: Protecting Ethernet PHY front-end circuitry in PoE-powered switches against induced lightning surges on RJ45 ports. IC Role / Device Role / Timing Role: Bidirectional TVS placed between each twisted pair and ground, shunting common-mode energy before reaching magnetics. Use Value: SMBJ51CAHM3/I's 600 W rating handles 10/700 µs telecom surges; low capacitance (<100 pF) avoids signal integrity degradation at 100 Mbps. |
Use Scenario: Secondary-side overvoltage clamp on 48 V DC input rails of industrial IoT gateways, guarding against backfeed and hot-swap transients. IC Role / Device Role / Timing Role: Standoff-rated TVS connected between VIN and GND, triggered only during >51 V excursions to avoid leakage in normal operation. Use Value: SMBJ51CAHM3/I's 1 µA max leakage at 51 V preserves efficiency; 82.4 V clamping protects downstream DC-DC controllers rated for 85 V absolute max. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ51CAHE3/I | Same electrical specs; RoHS-compliant but not halogen-free; lacks AEC-Q101 qualification. | Approved for commercial/industrial use only; unsuitable for automotive under-hood deployment. | Select when cost sensitivity outweighs halogen-free or automotive qualification requirements. |
| SMCJ51CAHM3 | Same VWM/VC, but in larger SMC (DO-214AB) package; higher PPPM = 1500 W. | Requires larger PCB area; used where higher surge margin is mandated (e.g., outdoor telecom cabinets). | Choose when system-level surge testing exceeds 600 W or thermal dissipation demands lower RθJA. |
Compared with SMBJ51CAHE3/I, SMBJ51CAHM3/I adds halogen-free compliance and AEC-Q101 validation - essential for Tier 1 automotive supply chains; versus SMCJ51CAHM3, it trades 900 W headroom for 30% smaller footprint and tighter layout constraints.
Availability
SMBJ51CAHM3/I is available at Aetrix Electronics and suitable for industrial sensor protection, automotive CAN bus interface, and telecom line interface applications requiring stable component supply, long-term lifecycle support, and AEC-Q101 traceability.
Supply support for SMBJ51CAHM3/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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and automotive-grade qualification.
The SMBJ series targets board-level transient suppression in harsh environments - engineered for rapid response, repeatable clamping, and compatibility with automated SMT assembly across automotive, industrial, and telecom end equipment.
FAQ
What is the clamping voltage of SMBJ51CAHM3/I at its rated peak pulse current?
The SMBJ51CAHM3/I has a maximum clamping voltage (VC) of 82.4 V at its peak pulse current (IPPM) of 7.3 A, measured under the standardized 10/1000 µs waveform. This value defines the upper voltage limit imposed on protected circuitry during surge events and is critical for ensuring downstream ICs remain within their absolute maximum ratings. The SMBJ51CAHM3/I maintains this clamping performance across its full operating temperature range.
Is SMBJ51CAHM3/I suitable for automotive applications?
Yes, SMBJ51CAHM3/I is AEC-Q101 qualified, as confirmed by the "HM3" suffix denoting halogen-free, RoHS-compliant, and automotive-grade construction. It meets stress test requirements including temperature cycling, humidity bias, and mechanical shock - making it appropriate for use in engine control units, body electronics, and ADAS sensor interfaces where reliability under thermal and vibration stress is mandatory. The SMBJ51CAHM3/I's 150 °C maximum junction temperature further supports under-hood deployment.
How does the bidirectional configuration of SMBJ51CAHM3/I affect its circuit placement?
The SMBJ51CAHM3/I is bidirectional, meaning it conducts identically in both polarities - eliminating the need for orientation during placement and enabling direct connection across any two nodes subject to bipolar transients. Unlike unidirectional TVS diodes, it requires no cathode marking or polarity alignment; both terminals are functionally interchangeable. This simplifies layout on differential lines (e.g., CAN, RS-485) and reduces assembly errors in high-volume manufacturing.
What is the standoff voltage (VWM) of SMBJ51CAHM3/I, and why is it important?
The standoff voltage (VWM) of SMBJ51CAHM3/I is 51 V - the maximum DC or continuous peak voltage the device will block without entering avalanche conduction. This parameter ensures minimal leakage current (<1 µA) during normal operation while providing sufficient margin above system nominal voltage (e.g., 48 V DC rails). Selecting a VWM correctly avoids false triggering and preserves power efficiency, and the SMBJ51CAHM3/I's 51 V rating aligns precisely with 48 V industrial and telecom power architectures.
Does SMBJ51CAHM3/I require special PCB layout considerations for thermal management?
Yes - although SMBJ51CAHM3/I is rated for 5.0 W power dissipation on an infinite heatsink at 50 °C, its thermal resistance (RθJA = 100 °C/W) means PCB copper pad area directly impacts sustained surge capability. Vishay specifies mounting on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal to achieve rated performance. Reducing pad size increases junction temperature rise during repetitive surges, potentially degrading long-term reliability. The SMBJ51CAHM3/I's SMB package benefits from symmetric copper pour to balance thermal distribution.
SMBJ51CAHM3/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):
- 51V
- Voltage - Breakdown (Min):
- 56.7V
- Voltage - Clamping (Max) @ Ipp:
- 82.4V
- Current - Peak Pulse (10/1000µs):
- 7.3A
- 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)
SMBJ51CAHM3/I FAQ
1.How can I place an order for SMBJ51CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ51CAHM3/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 SMBJ51CAHM3/I reliable?
The price and inventory of SMBJ51CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ51CAHM3/I is usually 5 days.
3.What payment methods are accepted for SMBJ51CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ51CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ51CAHM3/I?
SMBJ51CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ51CAHM3/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 SMBJ51CAHM3/I?
For technical support, including SMBJ51CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ51CAHM3/I requirements.
6.How does Aetrix verify that SMBJ51CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SMBJ51CAHM3/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 SMBJ51CAHM3/I meets industry standards.
7.What is the process for return or replacement of SMBJ51CAHM3/I?
All SMBJ51CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ51CAHM3/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 SMBJ51CAHM3/I part is unused and in its original packaging.
Return procedure for SMBJ51CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ51CAHM3/I Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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D5V0P1B2LP-7B
Diodes Incorporated
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DESD5V0U1BA-7
Diodes Incorporated
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ESD5Z5.0T1G
onsemi
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DESD5V0U1BB-7
Diodes Incorporated
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D12V0L1B2LP-7B
Diodes Incorporated
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PESD2V0Y1BSFYL
Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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