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Vishay General Semiconductor - Diodes Division SMCJ51CAHM3/H
- Part No.:
- SMCJ51CAHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ51CAHM3/H.pdf
- Description:
- TVS DIODE 51VWM 82.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,108
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Product details
Overview
SMCJ51CAHM3/H from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for high-energy surge protection on power and signal lines. It features a 51 V standoff voltage (VWM), 82.4 V clamping voltage (VC) at 18.2 A peak pulse current (IPPM), and 1500 W peak pulse power (PPPM) with 10/1000 μs waveform - deployed to safeguard MOSFETs, ICs, and sensor interfaces in automotive and industrial systems.
For engineers reviewing the SMCJ51CAHM3/H datasheet, SMCJ51CAHM3/H pinout, SMCJ51CAHM3/H application, or SMCJ51CAHM3/H equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, halogen-free RoHS compliance, and compatibility with automated SMT assembly on 8.0 mm × 8.0 mm copper pads.
Technical Context
This device operates as a voltage-clamped crowbar during transients: when reverse voltage exceeds its breakdown range (56.7–62.7 V at 1 mA), it enters avalanche conduction to limit downstream voltage to ≤82.4 V. Its bidirectional symmetry enables protection of AC-coupled or floating lines without polarity concerns.
Thermal design relies on low junction-to-lead resistance (RθJL = 15 °C/W) and derating above 25 °C per Fig. 2; maximum junction temperature is 150 °C. The glass-passivated junction ensures stable leakage (<1.0 μA at VWM) and fast response (<1 ns), meeting IEC 61000-4-2/4-4/4-5 surge immunity requirements.
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 avalanche initiation window for reliable turn-on |
| VC @ IPPM | 82.4 V at 18.2 A - clamped voltage under 10/1000 μs surge, defining protected circuit stress level |
| PPPM | 1500 W - peak surge energy handling capacity, enabling robust protection against lightning and inductive spikes |
| ID @ VWM | ≤1.0 μA - ultra-low leakage preserves signal integrity and battery life in always-on circuits |
| TJ max | +150 °C - supports operation in under-hood automotive and industrial environments |
| Package | SMC (DO-214AB) - surface-mount footprint compatible with IPC-7351B standard, 7.75 mm × 6.22 mm body |
Pinout & Package
SMCJ51CAHM3/H uses a 2-terminal SMC (DO-214AB) package with no polarity marking - consistent with bidirectional functionality. Terminals are matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102, rated MSL Level 1 (peak reflow 260 °C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (positive half-cycle) | Conducts during positive overvoltage events; symmetric with cathode for bidirectional clamping |
| Cathode | Transient current entry (negative half-cycle) | Conducts during negative overvoltage events; functionally identical to anode in bidirectional configuration |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per JESD47 |
| Halogen-free & RoHS-compliant | Meets EU Directive 2011/65/EU and JEDEC JS709E; eliminates brominated flame retardants |
| Low incremental surge resistance | Enables tighter VC/VBR ratio (82.4 V / 56.7 V ≈ 1.45), minimizing let-through energy to protected ICs |
| Fast response time | <1 ns turn-on ensures clamping occurs before sensitive logic or analog circuitry sustains damage |
| UL 94 V-0 molding compound | Self-extinguishing encapsulation prevents fire propagation in high-power fault conditions |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V/24 V vehicle power distribution networks from load dump (ISO 7637-2 Pulse 5a) and alternator transients. IC Role / Device Role / Timing Role: Bidirectional TVS placed upstream of DC-DC converters and microcontrollers to clamp surges up to ±150 V. Use Value: Withstands 1500 W peak pulses and operates up to +150 °C, ensuring uninterrupted function in engine control units and ADAS modules. | Use Scenario: Shielding 4–20 mA current-loop or RS-485 fieldbus inputs in PLCs and motor drives from ESD and cable-induced surges. IC Role / Device Role / Timing Role: Placed across differential pairs or supply rails to shunt transient energy before it reaches precision ADCs or isolators. Use Value: 1.0 μA max leakage at 51 V preserves loop accuracy; 82.4 V clamping protects 3.3 V/5 V interface ICs without additional series impedance. |
| Consumer Device USB Port Protection | Telecom Line Card Surge Suppression |
Use Scenario: Safeguarding USB 2.0 data lines and VBUS in set-top boxes and smart home hubs against contact ESD (±8 kV) and system-level surges. IC Role / Device Role / Timing Role: Bidirectional placement on D+ and D− lines, plus VBUS, to provide symmetrical clamping without polarity constraints. Use Value: Sub-1 ns response captures ESD events before USB transceivers latch up; halogen-free construction meets IEC 62474 material declaration requirements. | Use Scenario: Protecting POTS line interfaces in VoIP gateways and DSLAMs from lightning-induced surges per ITU-T K.20/K.21. IC Role / Device Role / Timing Role: Used in parallel with gas discharge tubes (GDTs) as secondary protection to limit let-through voltage after GDT firing. Use Value: 1500 W PPPM rating handles residual energy after primary GDT clamping; DO-214AB footprint allows compact layout in space-constrained line cards. |
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 | Lower PPPM (600 W), SMB (DO-214AA) package, same VWM/VC specs | Reduced surge margin; suitable only for lower-energy threats (IEC 61000-4-2 ±8 kV, not lightning) | Select when board space is constrained and surge threat level is limited to ESD and switching noise |
| 1.5KE51CA | Through-hole TO-218 package, same electrical specs, higher thermal mass but no SMT compatibility | Requires wave soldering; incompatible with automated SMT lines and dense PCB layouts | Choose only for legacy through-hole designs or where mechanical robustness outweighs assembly efficiency |
Compared with SMBJ51CAHE3/A and 1.5KE51CA, SMCJ51CAHM3/H delivers optimal balance of high-energy surge handling (1500 W), SMT manufacturability, and automotive qualification - making it the preferred choice for new designs targeting ISO 16750-2 and IEC 61000-4-5 compliance.
Availability
SMCJ51CAHM3/H is available at Aetrix Electronics and suitable for automotive electronics, industrial PLCs, and telecom infrastructure requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMCJ51CAHM3/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 SMCJ series targets high-reliability transient suppression in harsh environments, engineered specifically for automotive, industrial, and telecom applications demanding AEC-Q101 qualification and 1500 W surge capability.
FAQ
What does the "HM3" suffix indicate in SMCJ51CAHM3/H?
The "HM3" suffix in SMCJ51CAHM3/H denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. The "H" indicates 7-inch tape-and-reel packaging (850 units per reel), while "M3" confirms compliance with JEDEC JS709E for halogen content and RoHS Directive 2011/65/EU - critical for automotive and green-electronics programs.
Is SMCJ51CAHM3/H suitable for protecting bidirectional signal lines like RS-485?
Yes, SMCJ51CAHM3/H is explicitly designed for bidirectional applications: its symmetrical breakdown (56.7–62.7 V in both directions) and unmarked terminals allow direct placement across differential pairs without polarity concerns. It clamps transients to ≤82.4 V while maintaining <1.0 μA leakage at 51 V - preserving signal fidelity in full-duplex communication links.
How does SMCJ51CAHM3/H perform under elevated ambient temperatures?
SMCJ51CAHM3/H derates linearly above 25 °C per Figure 2 in the datasheet: at 85 °C ambient, its 1500 W peak pulse power drops to ~1050 W, and at 125 °C, it falls to ~650 W. Its 150 °C max junction temperature and 15 °C/W junction-to-lead thermal resistance enable effective heat dissipation when mounted on recommended 8.0 mm × 8.0 mm copper pads.
Can SMCJ51CAHM3/H replace SMCJ51A in a design?
No - SMCJ51CAHM3/H is bidirectional, while SMCJ51A is unidirectional. Replacing one with the other requires circuit review: SMCJ51A has a cathode band and conducts only in reverse bias, whereas SMCJ51CAHM3/H clamps equally in both polarities. Using SMCJ51CAHM3/H in place of SMCJ51A may cause unintended conduction in DC-biased rails.
What is the clamping voltage of SMCJ51CAHM3/H at its rated peak pulse current?
The clamping voltage (VC) of SMCJ51CAHM3/H is 82.4 V measured at its specified peak pulse current (IPPM) of 18.2 A, using the standardized 10/1000 μs double-exponential surge waveform. This value defines the maximum voltage imposed on protected circuitry during worst-case transient events and is guaranteed across the full operating temperature range.
SMCJ51CAHM3/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- 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):
- 18.2A
- Power - Peak Pulse:
- 1500W (1.5kW)
- 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-214AB (SMC)
SMCJ51CAHM3/H FAQ
1.How can I place an order for SMCJ51CAHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ51CAHM3/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 SMCJ51CAHM3/H reliable?
The price and inventory of SMCJ51CAHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ51CAHM3/H is usually 5 days.
3.What payment methods are accepted for SMCJ51CAHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ51CAHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ51CAHM3/H?
SMCJ51CAHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ51CAHM3/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 SMCJ51CAHM3/H?
For technical support, including SMCJ51CAHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ51CAHM3/H requirements.
6.How does Aetrix verify that SMCJ51CAHM3/H is sourced from the original manufacturer or authorized distributors?
All SMCJ51CAHM3/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 SMCJ51CAHM3/H meets industry standards.
7.What is the process for return or replacement of SMCJ51CAHM3/H?
All SMCJ51CAHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ51CAHM3/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 SMCJ51CAHM3/H part is unused and in its original packaging.
Return procedure for SMCJ51CAHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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