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Vishay General Semiconductor - Diodes Division SMCJ51CA-E3/9AT
- Part No.:
- SMCJ51CA-E3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ51CA-E3/9AT.pdf
- Description:
- TVS DIODE 51VWM 82.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,232
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Product details
Overview
SMCJ51CA-E3/9AT from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for robust overvoltage protection of sensitive electronics. It features a 51 V standoff voltage (VWM), 82.4 V maximum clamping voltage (VC) at 18.2 A peak pulse current (IPPM), and 1500 W peak pulse power dissipation (10/1000 µs waveform), commonly deployed on power rails and signal lines in automotive ECUs and industrial sensor interfaces.
For engineers reviewing the SMCJ51CA-E3/9AT datasheet, SMCJ51CA-E3/9AT pinout, SMCJ51CA-E3/9AT application, or SMCJ51CA-E3/9AT equivalent, key selection criteria include bidirectional clamping symmetry, low incremental surge resistance, AEC-Q101 qualification eligibility (via HE3 suffix variants), and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
This device operates as a silicon avalanche diode with glass-passivated junction, delivering symmetrical clamping in both directions due to its bidirectional construction. Its breakdown voltage (VBR) is specified between 56.7 V and 62.7 V at 1 mA test current, with a temperature coefficient of 0.104 %/°C - enabling predictable voltage drift across -55 °C to +150 °C operating range.
It meets J-STD-020 MSL Level 1 moisture sensitivity and supports reflow up to 260 °C peak. The SMC (DO-214AB) package provides low thermal resistance (RθJL = 15 °C/W) and UL 94 V-0 flammability compliance, making it suitable for high-reliability board-level surge suppression without polarity marking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51 V - Maximum continuous reverse operating voltage before clamping initiates; defines safe working margin below breakdown. |
| VBR min/max | 56.7 V / 62.7 V at IT = 1 mA - Ensures consistent avalanche turn-on across production lots and temperature. |
| VC @ IPPM | 82.4 V at 18.2 A - Clamped voltage during 10/1000 µs surge; determines protected circuit's maximum transient exposure. |
| PPPM | 1500 W - Peak pulse power handling capability; enables protection against IEC 61000-4-5 Level 4 surges (4 kV/2 Ω). |
| IPPM | 18.2 A - Peak surge current supported at rated clamping voltage; used to size PCB trace width and pad thermal mass. |
| TJ max | +150 °C - Maximum junction temperature; allows operation in under-hood automotive environments with minimal derating. |
| RθJA | 75 °C/W - Junction-to-ambient thermal resistance on standard FR-4; informs heatsinking requirements for repetitive surge duty. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, bidirectional configuration with no polarity marking. Matte tin-plated leads compliant with J-STD-002 and JESD 22-B102 solderability standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (bidirectional) | Acts as cathode during positive transients; forms symmetrical clamping path with opposite terminal. |
| Cathode | Transient current entry (bidirectional) | Acts as anode during negative transients; enables identical clamping behavior in both voltage polarities. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR, VC, and IPPM performance in both directions - eliminates need for polarity-aware layout or orientation verification. |
| Low incremental surge resistance | Enables tighter clamping window (VC − VBR ≈ 25.7 V) - reduces stress on downstream MOSFETs or ICs during fast transients. |
| MSL Level 1 rating | Unlimited floor life at ≤30 °C/60% RH - supports just-in-time SMT assembly without dry-pack or baking requirements. |
| AEC-Q101 qualification path | HE3/HM3 suffix variants available - permits direct use in automotive powertrain and body control modules requiring stress-tested components. |
| Glass passivated junction | Improves long-term reliability and leakage stability under humidity and thermal cycling - critical for industrial field-deployed equipment. |
Applications
| Automotive Power Supply Protection | Industrial Sensor Signal Line Guarding |
|---|---|
Use Scenario: Protecting 12 V battery-fed microcontroller power inputs in engine control units against load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional TVS clamping element placed directly at connector entry point before DC/DC converter input. Use Value: Limits transient excursions to ≤82.4 V during 100 A/100 ms load dump events, preventing latch-up or gate oxide damage in downstream regulators. | Use Scenario: Shielding analog output lines (e.g., 4–20 mA current loop) of pressure sensors in factory automation PLC I/O modules. IC Role / Device Role / Timing Role: Low-capacitance (<100 pF typical) shunt protector mounted adjacent to connector pins to divert ESD and switching noise. Use Value: Maintains signal integrity by clamping transients within 1 ns response time while adding <0.5 pF parasitic capacitance to the signal path. |
| Telecom DC Power Feeds | Consumer Appliance Motor Drive Inputs |
Use Scenario: Safeguarding PoE-powered Ethernet switch ports against induced lightning surges on 48 V DC supply lines. IC Role / Device Role / Timing Role: Primary-stage TVS on midspan injector output, coordinated with gas discharge tube (GDT) upstream. Use Value: Absorbs 1500 W surge energy per event without degradation, meeting IEC 61000-4-5 Combination Wave (1.2/50 µs & 8/20 µs) requirements. | Use Scenario: Suppressing commutation spikes from brushed DC motors in smart home vacuum cleaners and robotic mowers. IC Role / Device Role / Timing Role: Clamp diode across motor terminals or H-bridge supply rail to quench inductive kickback. Use Value: Withstands 200 A non-repetitive forward surge (IFSM), surviving repeated motor stall conditions without parametric shift. |
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 (500 W), smaller SMA package, higher VC/VBR ratio (≈1.5×) | Limited to lower-energy transients (IEC 61000-4-2 ESD only); unsuitable for IEC 61000-4-5 surge. | Select when board space is constrained and surge energy is <500 W; verify thermal margin on 2.5 mm² pads. |
| 1.5KE51CA | Through-hole DO-201 package, same VWM/VC, but slower response and higher Rsurge | Requires manual or wave soldering; not compatible with high-speed automated SMT lines. | Choose for legacy through-hole designs or prototyping where rework tolerance outweighs surge performance. |
Compared with SAC51CA and 1.5KE51CA, the SMCJ51CA-E3/9AT delivers superior surge robustness (1500 W vs. 500 W/1500 W), SMT scalability, and tighter clamping - making it optimal for volume-manufactured automotive and industrial systems demanding repeatable, automated protection.
Availability
SMCJ51CA-E3/9AT is available at Aetrix Electronics and suitable for automotive ECU power rails, industrial sensor interface protection, and telecom DC feed surge suppression requiring stable component supply across multi-year production cycles.
Supply support for SMCJ51CA-E3/9AT 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, automotive qualification, and high-volume manufacturability.
The SMCJ series was developed specifically for high-power, surface-mount transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where failure modes must be mitigated without compromising board density or assembly efficiency.
FAQ
What is the clamping voltage of SMCJ51CA-E3/9AT at its rated peak pulse current?
The SMCJ51CA-E3/9AT has a maximum clamping voltage (VC) of 82.4 V when subjected to its rated peak pulse current (IPPM) of 18.2 A under a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and ensures predictable overvoltage limiting for downstream components such as microcontrollers or power MOSFETs. The SMCJ51CA-E3/9AT maintains this clamping performance symmetrically in both directions due to its bidirectional design.
Is SMCJ51CA-E3/9AT RoHS-compliant and halogen-free?
Yes, the SMCJ51CA-E3/9AT carries the "E3" suffix, indicating it is RoHS-compliant and meets commercial-grade environmental specifications per Vishay's material categorization (www.vishay.com/doc?99912). It is not halogen-free; for halogen-free compliance, the "M3" suffix variant (e.g., SMCJ51CA-M3/9AT) should be selected. Both E3 and M3 versions share identical electrical and thermal performance.
Does SMCJ51CA-E3/9AT have AEC-Q101 qualification?
The base SMCJ51CA-E3/9AT is not AEC-Q101 qualified; however, Vishay offers AEC-Q101-qualified versions under the HE3 (RoHS-compliant + AEC-Q101) and HM3 (halogen-free + RoHS + AEC-Q101) suffixes. These require distinct part numbers (e.g., SMCJ51CAHE3_A/I) and are tested per stress test conditions defined in AEC-Q101. The SMCJ51CA-E3/9AT itself is rated for automotive-adjacent use but lacks formal qualification documentation.
What is the thermal resistance from junction to lead (RθJL) for SMCJ51CA-E3/9AT?
The SMCJ51CA-E3/9AT has a typical junction-to-lead thermal resistance (RθJL) of 15 °C/W, as specified in Vishay's datasheet (Document Number: 88394). This low value reflects efficient heat conduction from the die to the SMC package leads, supporting reliable operation under repetitive surge conditions when mounted on recommended 8.0 mm × 8.0 mm copper pads. The SMCJ51CA-E3/9AT leverages this thermal path to sustain its 6.5 W steady-state power dissipation rating at TA = 50 °C.
How does the bidirectional nature of SMCJ51CA-E3/9AT affect PCB layout compared to unidirectional TVS diodes?
The SMCJ51CA-E3/9AT has no polarity marking and functions identically in both voltage polarities, eliminating orientation constraints during PCB layout and automated placement. Unlike unidirectional TVS diodes (e.g., SMCJ51A), it requires no cathode band alignment or directional routing - reducing assembly errors and simplifying footprint reuse across differential or AC-coupled signal paths. This symmetry is intrinsic to the SMCJ51CA-E3/9AT's internal structure and verified across its full operating temperature range (-55 °C to +150 °C).
SMCJ51CA-E3/9AT 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
SMCJ51CA-E3/9AT FAQ
1.How can I place an order for SMCJ51CA-E3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ51CA-E3/9AT 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 SMCJ51CA-E3/9AT reliable?
The price and inventory of SMCJ51CA-E3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ51CA-E3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ51CA-E3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ51CA-E3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ51CA-E3/9AT?
SMCJ51CA-E3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ51CA-E3/9AT 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 SMCJ51CA-E3/9AT?
For technical support, including SMCJ51CA-E3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ51CA-E3/9AT requirements.
6.How does Aetrix verify that SMCJ51CA-E3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ51CA-E3/9AT 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 SMCJ51CA-E3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ51CA-E3/9AT?
All SMCJ51CA-E3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ51CA-E3/9AT, 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 SMCJ51CA-E3/9AT part is unused and in its original packaging.
Return procedure for SMCJ51CA-E3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ51CA-E3/9AT Tags
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