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Vishay General Semiconductor - Diodes Division SMBJ51CAHM3_A/H
- Part No.:
- SMBJ51CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ51CAHM3_A/H.pdf
- Description:
- TVS DIODE 51VWM 82.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,679
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Product details
Overview
SMBJ51CAHM3_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 and 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 surge current - deployed in industrial sensor interfaces and telecom line protection.
For engineers reviewing the SMBJ51CAHM3_A/H datasheet, SMBJ51CAHM3_A/H pinout, SMBJ51CAHM3_A/H application, or SMBJ51CAHM3_A/H equivalent, this device is selected for robust ESD and lightning surge immunity in bidirectional AC-coupled or floating signal paths where low clamping voltage and fast response (<1 ns) are critical.
Technical Context
This bidirectional TVS operates symmetrically across both polarities with identical breakdown (VBR min/max = 56.7 V / 62.7 V at 1 mA) and clamping behavior. Its glass-passivated junction ensures stable leakage (<1 µA at 51 V) and repeatable surge performance up to 150 °C junction temperature.
The device meets MSL Level 1 per J-STD-020 (peak reflow 260 °C), uses matte tin-plated leads compliant with J-STD-002, and is halogen-free and RoHS-compliant under HM3 suffix - qualified to AEC-Q101 for automotive-grade reliability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51 V - maximum continuous reverse operating voltage before clamping begins |
| VBR (min/max) | 56.7 V / 62.7 V at 1 mA - guaranteed symmetrical breakdown threshold in both directions |
| VC @ IPPM | ≤82.4 V at 7.3 A - clamping voltage limits downstream IC stress during 10/1000 µs transients |
| PPPM | 600 W - peak transient energy absorption capability without failure |
| IPPM | 7.3 A - maximum non-repetitive surge current supported under standard waveform |
| TJ max. | +150 °C - enables operation in high-temperature industrial enclosures and under-hood automotive zones |
| Package | SMB (DO-214AA) - 0.220" × 0.155" footprint compatible with automated SMT placement and IPC-7351B land patterns |
Pinout & Package
Two-terminal bidirectional device in SMB (DO-214AA) package; no polarity marking required. Terminals are unmarked anode/cathode pair - electrically symmetrical with identical characteristics in either direction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode or Cathode (bidirectional) | Either terminal serves as input/output path - no orientation dependency in PCB layout |
| Terminal 2 | Anode or Cathode (bidirectional) | Paired terminal completes symmetrical clamping path - connects across protected line and ground or differential pair |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Handles IEC 61000-4-5 Level 4 surges (4 kV line-earth) without degradation |
| Low clamping ratio (VC/VBR ≈ 1.31) | Minimizes overvoltage exposure to downstream MOSFETs or RS-485 transceivers |
| MSL Level 1 rating | Supports single-reflow assembly without moisture sensitivity concerns |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive infotainment and body control module applications |
| Halogen-free & RoHS-compliant | Fulfills EU ELV and China RoHS environmental compliance requirements |
Applications
| Industrial Sensor Interface | Telecom Line Protection |
|---|---|
Use Scenario: Protecting 4–20 mA current-loop sensors from inductive switching transients in factory automation PLCs. IC Role / Device Role / Timing Role: Bidirectional TVS placed across loop terminals to clamp ±1 kV EFT bursts without disrupting analog signal integrity. Use Value: Maintains <1 µA leakage at 51 V, preventing loop current error while limiting clamped voltage to 82.4 V - within safe margin of 100 V-rated op-amps. |
Use Scenario: Shielding RS-485 data lines in outdoor base stations against lightning-induced surges. IC Role / Device Role / Timing Role: Differential TVS pair (one per line) referenced to common ground, absorbing common-mode transients up to 600 W. Use Value: Symmetrical 56.7–62.7 V breakdown ensures equal clamping on TX+/TX−, preserving signal skew and enabling >500 kbps data integrity after surge events. |
| Automotive Body Control Module | Consumer Appliance Motor Drive |
Use Scenario: Safeguarding LIN bus nodes in door modules from load dump and jump-start voltage spikes. IC Role / Device Role / Timing Role: Bidirectional clamping device connected between LIN line and chassis ground, rated for 150 °C ambient. Use Value: AEC-Q101 qualification and 150 °C TJ max ensure reliability in sealed, thermally constrained compartments near vehicle doors. |
Use Scenario: Suppressing commutation spikes from brushed DC motors in smart vacuum cleaners and power tools. IC Role / Device Role / Timing Role: Across-motor terminals to absorb inductive kickback during PWM switching cycles. Use Value: 600 W pulse rating handles repetitive 100 A motor stall surges; low thermal resistance (RθJL = 20 °C/W) prevents thermal runaway during burst-mode operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ51CAHE3_A/H | Same electrical specs; RoHS-compliant but not halogen-free; lacks AEC-Q101 qualification | Restricted to commercial-grade industrial or consumer use; not approved for automotive deployment | Select when halogen-free content or automotive qualification is not required - lower cost alternative |
| SMAJ51CAHM3_A/H | Lower 400 W PPPM; same VWM/VC but reduced surge current (IPPM = 4.9 A) | Suitable only for lighter-duty IEC 61000-4-2/4-4 environments; insufficient for IEC 61000-4-5 Level 4 | Choose only if board space constraints mandate SMA package and surge threat level is ≤2 kV |
Compared with SMBJ51CAHM3_A/H, the HE3 variant trades halogen-free content and AEC-Q101 for cost savings in non-automotive settings, while the SMAJ51CAHM3_A/H reduces surge robustness by 33 % to fit smaller footprints - neither offers drop-in replacement capability due to differing power ratings or qualification scope.
Availability
SMBJ51CAHM3_A/H is available at Aetrix Electronics and suitable for industrial sensor interfaces, telecom line protection, and automotive body control modules requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMBJ51CAHM3_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, and protection devices with emphasis on reliability and application-specific performance.
The SMBJ series was engineered for high-energy transient suppression in harsh environments - targeting industrial automation, automotive electronics, and infrastructure equipment where surge immunity directly impacts field failure rates.
FAQ
What is the clamping voltage of SMBJ51CAHM3_A/H at its rated peak pulse current?
The SMBJ51CAHM3_A/H clamps to a maximum of 82.4 V when subjected to its specified peak pulse current of 7.3 A under the standard 10/1000 µs waveform. This value is measured across both terminals and applies identically in either polarity due to its bidirectional design. The clamping voltage directly determines the maximum overvoltage stress imposed on downstream circuitry during surge events.
Is SMBJ51CAHM3_A/H suitable for automotive applications?
Yes - the HM3 suffix confirms SMBJ51CAHM3_A/H is halogen-free, RoHS-compliant, and AEC-Q101 qualified. It has been tested for temperature cycling, humidity bias, and mechanical shock per automotive standards, making it appropriate for body control modules, infotainment interfaces, and other non-safety-critical vehicle subsystems operating up to 150 °C junction temperature.
How does the bidirectional nature of SMBJ51CAHM3_A/H affect PCB layout?
The SMBJ51CAHM3_A/H has no polarity marking and functions identically regardless of orientation - simplifying layout by eliminating cathode alignment checks. Engineers may place it across any two points needing symmetrical overvoltage protection (e.g., differential signal pairs or AC-coupled lines), reducing routing complexity and eliminating risk of reverse installation during assembly.
What is the thermal resistance from junction to lead for SMBJ51CAHM3_A/H?
The SMBJ51CAHM3_A/H has a typical junction-to-lead thermal resistance (RθJL) of 20 °C/W, enabling efficient heat transfer to PCB copper pads. This value supports reliable operation under repetitive surge conditions when mounted on minimum recommended pad layouts (0.2" × 0.2" copper per terminal), and informs derating calculations above 25 °C ambient per Figure 2 in the Vishay datasheet 88392.
Does SMBJ51CAHM3_A/H meet moisture sensitivity level requirements for lead-free reflow?
Yes - SMBJ51CAHM3_A/H is rated MSL Level 1 per J-STD-020, meaning it can be stored indefinitely at ≤30 °C/60 % RH and withstand peak reflow temperatures up to 260 °C without preconditioning. This eliminates bake-out steps and supports standard lead-free SMT processes, including single-pass reflow in high-volume manufacturing environments.
SMBJ51CAHM3_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):
- 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_A/H FAQ
1.How can I place an order for SMBJ51CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ51CAHM3_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 SMBJ51CAHM3_A/H reliable?
The price and inventory of SMBJ51CAHM3_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 SMBJ51CAHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMBJ51CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ51CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ51CAHM3_A/H?
SMBJ51CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ51CAHM3_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 SMBJ51CAHM3_A/H?
For technical support, including SMBJ51CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ51CAHM3_A/H requirements.
6.How does Aetrix verify that SMBJ51CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMBJ51CAHM3_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 SMBJ51CAHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMBJ51CAHM3_A/H?
All SMBJ51CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ51CAHM3_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 SMBJ51CAHM3_A/H part is unused and in its original packaging.
Return procedure for SMBJ51CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ51CAHM3_A/H Tags
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