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Vishay General Semiconductor - Diodes Division SMBJ51CAHM3/H
- Part No.:
- SMBJ51CAHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ51CAHM3/H.pdf
- Description:
- TVS DIODE 51VWM 82.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:4,140
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Product details
Overview
SMBJ51CAHM3/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 51 V standoff voltage (VWM), 600 W peak pulse power (10/1000 µs), and clamps to ≤82.4 V at 7.3 A peak pulse current - deployed in industrial sensor interfaces, automotive body control modules, and telecom line protection.
For engineers reviewing the SMBJ51CAHM3/H datasheet, SMBJ51CAHM3/H pinout, SMBJ51CAHM3/H application, or SMBJ51CAHM3/H equivalent, this device serves as a halogen-free, RoHS-compliant, AEC-Q101-qualified TVS for bidirectional surge suppression where low clamping voltage, fast response (<1 ns), and MSL Level 1 reflow compatibility are critical selection criteria.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with breakdown voltage (VBR) specified at 56.7–62.7 V (min/max) under 1 mA test current. Its clamping behavior is defined by a maximum VC of 82.4 V at IPPM = 7.3 A, delivering predictable overvoltage protection without polarity dependence.
Thermally, it exhibits RθJA = 100 °C/W (typ.) and RθJL = 20 °C/W (typ.), enabling reliable operation up to TJ = 150 °C. The device meets J-STD-020 MSL Level 1 and supports lead-free reflow up to 260 °C peak temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51 V - Maximum continuous reverse operating voltage before clamping initiates; defines safe working range for protected circuitry. |
| VBR (min/max) | 56.7 V / 62.7 V - Breakdown occurs within this band at 1 mA; ensures consistent turn-on threshold across production lots. |
| VC @ IPPM | ≤82.4 V @ 7.3 A - Clamped voltage during 10/1000 µs transient; determines maximum stress imposed on downstream ICs. |
| PPPM | 600 W - Peak pulse power handling capability; enables robust protection against lightning-induced surges and inductive switching spikes. |
| ID @ VWM | ≤1.0 µA - Reverse leakage at rated standoff voltage; minimizes standby power loss and avoids false triggering in high-impedance nodes. |
| TJ max. | +150 °C - Maximum junction temperature; supports operation in under-hood automotive and industrial environments. |
| Package | SMB (DO-214AA) - Standardized surface-mount outline with 5.59 mm × 4.06 mm footprint; compatible with automated pick-and-place and reflow. |
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 | Either terminal serves as input/output for bidirectional clamping; no cathode band marking required per spec. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without external polarity management. |
| 600 W peak pulse power (10/1000 µs) | Withstands high-energy transients common in automotive load-dump and industrial motor drive environments. |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive applications including body electronics, infotainment, and ADAS sensor interfaces. |
| Halogen-free & RoHS-compliant | Meets environmental compliance requirements for global OEM supply chains and end-of-life recycling mandates. |
| MSL Level 1, 260 °C peak reflow | Supports standard SMT assembly without moisture sensitivity concerns or pre-bake requirements. |
Applications
| Automotive Body Control Module | Industrial Sensor Signal Conditioning |
|---|---|
|
Use Scenario: Protecting LIN bus transceivers and microcontroller GPIOs from load-dump and ESD events in door module ECUs. IC Role / Device Role / Timing Role: Bidirectional TVS placed directly at connector interface to clamp ±100 V transients before reaching sensitive analog/digital inputs. Use Value: Limits clamped voltage to ≤82.4 V, ensuring survival of 5 V logic-level devices and maintaining communication integrity during battery disconnection events. |
Use Scenario: Shielding 4–20 mA current-loop sensor outputs from field-induced surges in factory automation PLC I/O modules. IC Role / Device Role / Timing Role: TVS connected across loop terminals to shunt transient energy away from precision op-amps and ADC front-ends. Use Value: Sub-1 ns response time prevents overshoot propagation into signal conditioning stages, preserving measurement accuracy during EFT bursts. |
| Telecom Line Interface | Consumer Appliance Motor Drive |
|
Use Scenario: Safeguarding Ethernet PHY magnetics and PoE controller inputs against lightning-induced surges on outdoor network drops. IC Role / Device Role / Timing Role: Primary protection stage mounted at RJ45 jack, preceding secondary GDT or polymer-based suppression. Use Value: 600 W rating handles IEC 61000-4-5 Level 4 (4 kV) surges while maintaining low capacitance (<100 pF) to avoid signal integrity degradation. |
Use Scenario: Suppressing back-EMF spikes generated by brushed DC motors in smart home appliances (e.g., vacuum cleaners, blenders). IC Role / Device Role / Timing Role: TVS placed across motor terminals to clamp inductive kickback before it couples into MCU power rails or Hall-effect sensors. Use Value: 82.4 V clamping voltage prevents latch-up in 3.3 V/5 V motor driver ICs and extends system reliability under repeated stall conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ51CAHE3/H | RoHS-compliant but not halogen-free; lacks AEC-Q101 qualification; same VWM, VBR, and PPPM. | Suitable for commercial-grade industrial or consumer designs where automotive qualification is unnecessary. | Select when halogen-free content or automotive qualification is not mandated by end-customer specifications. |
| SMAJ51CAHM3 | Lower PPPM (400 W); same VWM/VBR; SMA (DO-214AC) package with smaller footprint (4.5 mm × 2.7 mm). | Better suited for space-constrained PCBs with lower surge threat levels (e.g., USB port protection). | Choose only if system-level surge testing confirms 400 W is sufficient and board layout cannot accommodate SMB dimensions. |
Compared with SMBJ51CAHE3/H and SMAJ51CAHM3, SMBJ51CAHM3/H uniquely combines halogen-free construction, AEC-Q101 qualification, and 600 W surge capacity in the SMB package - making it the preferred choice for automotive Tier-1 suppliers and industrial OEMs requiring full compliance traceability and higher energy handling.
Availability
SMBJ51CAHM3/H is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, and telecom line protection requiring stable component supply, long-term lifecycle support, and full compliance documentation.
Supply support for SMBJ51CAHM3/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 targets high-energy transient suppression in harsh environments - engineered for automotive, industrial, and telecom systems where robustness, repeatability, and regulatory compliance are non-negotiable.
FAQ
What does the 'CA' suffix indicate in SMBJ51CAHM3/H?
The 'CA' suffix denotes a bidirectional configuration - meaning SMBJ51CAHM3/H provides symmetrical clamping for both positive and negative transients without polarity dependency. Unlike unidirectional variants (e.g., SMBJ51A), SMBJ51CAHM3/H has no cathode marking and functions identically regardless of voltage polarity applied across its terminals.
Is SMBJ51CAHM3/H qualified for automotive use?
Yes, SMBJ51CAHM3/H is AEC-Q101 qualified, as confirmed by the 'HM3' suffix and Vishay's ordering information table. This qualification validates its reliability for automotive applications including engine control units, body electronics, and ADAS sensor interfaces under extended temperature and vibration stress conditions.
What is the maximum clamping voltage of SMBJ51CAHM3/H under surge conditions?
The maximum clamping voltage (VC) of SMBJ51CAHM3/H is 82.4 V at a peak pulse current (IPPM) of 7.3 A, measured using the standardized 10/1000 µs waveform. This value represents the upper limit of voltage seen by protected circuitry during worst-case transient events.
How does SMBJ51CAHM3/H differ from SMBJ51A in practical design?
SMBJ51CAHM3/H is bidirectional with symmetrical clamping, while SMBJ51A is unidirectional and requires correct cathode orientation. In AC-coupled or floating circuits - such as RS-485 buses or transformer-isolated power supplies - SMBJ51CAHM3/H eliminates polarity layout constraints and simplifies BOM management versus using two unidirectional devices.
Does SMBJ51CAHM3/H require special PCB layout considerations?
Yes - to achieve rated 600 W pulse power, Vishay specifies mounting on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. Minimizing trace inductance and maximizing thermal copper area directly impacts clamping performance and reliability during repetitive surge events. Use of internal ground/power planes is recommended for enhanced heat dissipation.
SMBJ51CAHM3/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:
- 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/H FAQ
1.How can I place an order for SMBJ51CAHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ51CAHM3/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 SMBJ51CAHM3/H reliable?
The price and inventory of SMBJ51CAHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ51CAHM3/H is usually 5 days.
3.What payment methods are accepted for SMBJ51CAHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ51CAHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ51CAHM3/H?
SMBJ51CAHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ51CAHM3/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 SMBJ51CAHM3/H?
For technical support, including SMBJ51CAHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ51CAHM3/H requirements.
6.How does Aetrix verify that SMBJ51CAHM3/H is sourced from the original manufacturer or authorized distributors?
All SMBJ51CAHM3/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 SMBJ51CAHM3/H meets industry standards.
7.What is the process for return or replacement of SMBJ51CAHM3/H?
All SMBJ51CAHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ51CAHM3/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 SMBJ51CAHM3/H part is unused and in its original packaging.
Return procedure for SMBJ51CAHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ51CAHM3/H Tags
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