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Vishay General Semiconductor - Diodes Division SMCJ51CAHE3_A/I
- Part No.:
- SMCJ51CAHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ51CAHE3_A/I.pdf
- Description:
- TVS DIODE 51VWM 82.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,577
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Product details
Overview
SMCJ51CAHE3_A/I 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 maximum clamping voltage at 18.2 A peak pulse current, and 1500 W peak pulse power rating with 10/1000 µs waveform - deployed in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the SMCJ51CAHE3_A/I datasheet, SMCJ51CAHE3_A/I pinout, SMCJ51CAHE3_A/I application, or SMCJ51CAHE3_A/I equivalent, key selection criteria include bidirectional clamping symmetry, AEC-Q101 qualification status, thermal resistance (RθJA = 75 °C/W), 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: breakdown occurs symmetrically in both directions (VBR min/max = 56.7 V / 62.7 V at IT = 1 mA), with low incremental surge resistance enabling rapid energy diversion. Its glass-passivated junction ensures stable leakage (<1 µA at VWM) and repeatable clamping performance across -55 °C to +150 °C junction temperature range.
The SMCJ51CAHE3_A/I is rated for 1500 W peak pulse power under standardized 10/1000 µs waveform, derated linearly above 25 °C ambient per Fig. 2, and supports surge currents up to 18.2 A without degradation when mounted per recommended pad layout. It meets MSL Level 1 per J-STD-020 and passes JESD201 Class 2 whisker testing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51 V - Maximum continuous reverse operating voltage before clamping initiates; defines safe operating margin for 48 V nominal systems. |
| VBR (min/max) | 56.7 V / 62.7 V at IT = 1 mA - Confirmed bidirectional breakdown window; ensures symmetrical overvoltage response. |
| VC @ IPPM | 82.4 V at 18.2 A - Clamping voltage under full 1500 W surge; limits downstream IC stress to <83 V during worst-case transients. |
| PPPM | 1500 W - Peak pulse power handling with 10/1000 µs waveform; validated on 8.0 mm × 8.0 mm copper pads per JEDEC standards. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive environments and sealed industrial enclosures. |
| RθJA | 75 °C/W - Junction-to-ambient thermal resistance; determines required board copper area for sustained power dissipation. |
| AEC-Q101 | Qualified - Certified for automotive-grade reliability including temperature cycling, HTRB, and ESD robustness per AEC specification. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, bidirectional configuration with no polarity marking. Dimensions: 7.75 mm × 6.22 mm × 2.62 mm (L × W × H); matte tin-plated leads compliant with J-STD-002 solderability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient return path (bidirectional) | Acts as cathode during positive surges and anode during negative surges; symmetric conduction eliminates need for orientation during placement. |
| Cathode | Transient return path (bidirectional) | Electrically identical to Anode terminal; terminals are interchangeable - no band marking on SMCJ51CAHE3_A/I. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity constraints or external circuitry. |
| AEC-Q101 qualification | Validated for automotive applications including engine control units, ADAS sensor interfaces, and infotainment power rails. |
| Glass passivated junction | Ensures stable VBR tolerance and low leakage (<1 µA) over lifetime, even under thermal cycling and humidity exposure. |
| MSL Level 1 rating | Allows unlimited floor life and reflow compatibility with standard lead-free profiles up to 260 °C peak temperature. |
| 1500 W surge capability | Withstands ISO 7637-2 Pulse 1, 2a, 3a/b and IEC 61000-4-5 Combination Wave (10/700 µs) without failure. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN FD and LIN bus transceivers from load dump and inductive switching transients in vehicle body control modules. IC Role / Device Role / Timing Role: Voltage-clamping TVS placed directly at connector entry point to shunt >1 kV spikes before reaching PHY layer. Use Value: Limits transient voltage to ≤82.4 V, preserving transceiver integrity while maintaining signal integrity through low capacitance (<100 pF at 0 V). |
Use Scenario: Safeguarding 24 V DC digital input channels in programmable logic controllers exposed to relay coil flyback and field wiring surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp on input filter stage, coordinated with series impedance and RC snubbers. Use Value: Absorbs 1500 W surges without degradation, enabling >100,000 surge cycles per IEC 61000-4-5 compliance testing. |
| Telecom Power Supply Protection | Consumer Appliance Motor Drive Protection |
Use Scenario: Secondary-side surge suppression on 48 V PoE-powered Ethernet switches and base station RF front-end supplies. IC Role / Device Role / Timing Role: Fast-response clamping element parallel to DC-DC converter output, triggered within <1 ns of overvoltage onset. Use Value: Maintains regulated output during lightning-induced surges by clamping within 82.4 V, preventing downstream regulator latch-up. |
Use Scenario: Input rail protection for BLDC motor driver ICs in smart washing machines and HVAC blowers subjected to brush commutation noise. IC Role / Device Role / Timing Role: Bidirectional clamp across H-bridge supply rails to suppress ±100 V switching spikes. Use Value: Symmetric clamping prevents reverse-bias damage to gate drivers and enables use of lower-voltage MOSFETs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC51CA | Lower PPPM (600 W), same VWM/VC, smaller SMA package (DO-214AC) | Limited to lower-energy surges; unsuitable for ISO 7637-2 Pulse 5a load dump simulation | Select only for space-constrained consumer designs where 1500 W rating is unnecessary. |
| SMCJ51CAHM3_A/I | Identical electrical specs; halogen-free molding compound and RoHS-compliant, AEC-Q101 qualified | No functional difference; differs only in material composition and environmental compliance | Choose when halogen-free requirement is mandated by OEM or regional regulatory policy. |
Compared with SAC51CA, SMCJ51CAHE3_A/I delivers 2.5× higher surge power handling and superior thermal robustness in SMC package; versus SMCJ51CAHM3_A/I, it shares identical protection performance but uses standard RoHS-compliant (non-halogen-free) epoxy.
Availability
SMCJ51CAHE3_A/I is available at Aetrix Electronics and suitable for automotive electronics, industrial PLCs, and telecom infrastructure requiring stable component supply with AEC-Q101 validation and long-term production continuity.
Supply support for SMCJ51CAHE3_A/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 high-reliability diodes, MOSFETs, and passive components for demanding industrial and automotive applications.
The SMCJ series targets high-energy transient suppression in harsh environments, with design focus on automotive-grade surge immunity, automated manufacturability, and long-term parametric stability under thermal stress.
FAQ
What is the clamping voltage of SMCJ51CAHE3_A/I at its rated peak pulse current?
The SMCJ51CAHE3_A/I has a maximum clamping voltage (VC) of 82.4 V at its rated peak pulse current (IPPM) of 18.2 A, measured using the standardized 10/1000 µs waveform. This value is guaranteed across the full operating temperature range and defines the upper voltage limit imposed on protected circuits during surge events. The SMCJ51CAHE3_A/I maintains this clamping performance due to its low incremental surge resistance and glass-passivated junction structure.
Is SMCJ51CAHE3_A/I suitable for automotive applications?
Yes, SMCJ51CAHE3_A/I is AEC-Q101 qualified and explicitly rated for automotive use, including engine control units, body electronics, and ADAS sensor interfaces. Its construction meets MSL Level 1, JESD201 Class 2 whisker resistance, and thermal cycling requirements defined in the AEC standard. The SMCJ51CAHE3_A/I is specified for operation from -55 °C to +150 °C junction temperature, supporting under-hood and cabin-mounted deployments.
How does the bidirectional configuration of SMCJ51CAHE3_A/I affect PCB layout?
The SMCJ51CAHE3_A/I has no polarity marking and identical electrical behavior in both directions, eliminating orientation constraints during placement. PCB layout requires symmetric 8.0 mm × 8.0 mm copper pads per terminal to achieve rated 1500 W surge capability and thermal performance. No silkscreen polarity indicator is needed, simplifying assembly and reducing risk of misplacement - a key advantage over unidirectional variants like SMCJ51AHE3_A/I.
What is the standoff voltage rating of SMCJ51CAHE3_A/I, and how does it relate to system voltage?
The SMCJ51CAHE3_A/I has a standoff voltage (VWM) of 51 V, meaning it remains non-conductive below this DC or RMS voltage level. This rating is selected to provide ≥20 % margin above nominal 48 V systems (e.g., automotive 42 V nominal, telecom -48 V DC), ensuring reliable blocking during normal operation while triggering promptly during overvoltage events. The SMCJ51CAHE3_A/I's VWM is verified at 1 µA leakage maximum, supporting low-power standby modes.
Does SMCJ51CAHE3_A/I require heatsinking for continuous operation?
No dedicated heatsink is required for transient suppression, as the SMCJ51CAHE3_A/I is rated for pulsed operation only. Its 6.5 W steady-state power dissipation (PD) applies only under continuous DC bias - not typical usage. For surge duty, thermal management relies on PCB copper area: the datasheet specifies 8.0 mm × 8.0 mm pads per terminal to achieve the 75 °C/W RθJA and sustain repeated 1500 W pulses. The SMCJ51CAHE3_A/I's thermal design assumes no external heatsink.
SMCJ51CAHE3_A/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
SMCJ51CAHE3_A/I FAQ
1.How can I place an order for SMCJ51CAHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ51CAHE3_A/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 SMCJ51CAHE3_A/I reliable?
The price and inventory of SMCJ51CAHE3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ51CAHE3_A/I is usually 5 days.
3.What payment methods are accepted for SMCJ51CAHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ51CAHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ51CAHE3_A/I?
SMCJ51CAHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ51CAHE3_A/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 SMCJ51CAHE3_A/I?
For technical support, including SMCJ51CAHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ51CAHE3_A/I requirements.
6.How does Aetrix verify that SMCJ51CAHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SMCJ51CAHE3_A/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 SMCJ51CAHE3_A/I meets industry standards.
7.What is the process for return or replacement of SMCJ51CAHE3_A/I?
All SMCJ51CAHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ51CAHE3_A/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 SMCJ51CAHE3_A/I part is unused and in its original packaging.
Return procedure for SMCJ51CAHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ51CAHE3_A/I Tags
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