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Vishay General Semiconductor - Diodes Division SMCJ51C-E3/9AT
- Part No.:
- SMCJ51C-E3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ51C-E3/9AT.pdf
- Description:
- TVS DIODE 51VWM 91.1VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,573
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Product details
Overview
SMCJ51C-E3/9AT from Vishay General Semiconductor is a bi-directional transient voltage suppressor (TVS) diode in DO-214AB (SMCJ) package, designed for robust overvoltage protection of sensitive electronics. It features a 51 V stand-off voltage (VWM), 82.4 V maximum clamping voltage (VC) at 18.2 A peak pulse current (IPPM), and 1500 W peak pulse power dissipation (PPPM) with 10/1000 μs waveform - suitable for automotive power line and industrial sensor interface protection.
For engineers reviewing the SMCJ51C-E3/9AT datasheet, SMCJ51C-E3/9AT pinout, SMCJ51C-E3/9AT application, or SMCJ51C-E3/9AT equivalent, this device is evaluated for ESD and surge immunity in bi-directional signal lines, DC power rails, and AEC-Q101-compliant automotive subsystems where low-leakage (<1 μA at VWM) and fast response (<1 ns) are critical.
Technical Context
The SMCJ51C-E3/9AT operates as a bi-directional avalanche diode with symmetrical breakdown characteristics: minimum breakdown voltage (VBR) is 56.7 V and maximum is 62.7 V at 1 mA test current (IT), confirming tight voltage tolerance for precise clamping. Its thermal resistance junction-to-lead (RθJL) is 15 °C/W, enabling effective heat transfer to PCB copper pads under surge conditions.
Designed per ANSI/IEEE C62.35 standards, it delivers consistent clamping performance across -55 °C to +150 °C operating junction temperature range. The device meets MSL Level 1 per J-STD-020 and passes JESD 201 Class 1A whisker testing, supporting high-reliability automated assembly in automotive and industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51 V - Maximum continuous reverse operating voltage before clamping initiates; defines safe DC bias margin for protected circuitry. |
| VBR min / max | 56.7 V / 62.7 V at 1 mA - Confirmed bi-directional breakdown window ensures predictable turn-on across polarity; critical for symmetric surge handling. |
| VC @ IPPM | 82.4 V at 18.2 A - Clamping voltage during 10/1000 μs surge; limits transient energy delivered to downstream ICs like microcontrollers or CAN transceivers. |
| PPPM | 1500 W - Peak pulse power rating with standard 10/1000 μs waveform; supports IEC 61000-4-5 Level 4 (4 kV) surge compliance when properly mounted. |
| ID @ VWM | <1 μA - Ultra-low reverse leakage at rated stand-off voltage; preserves signal integrity and minimizes standby power loss in battery-powered systems. |
| TJ max. | +150 °C - Maximum junction temperature rating enables operation in under-hood automotive environments and high-ambient industrial enclosures. |
| Package | DO-214AB (SMCJ) - Surface-mount package with 8.0 mm × 8.0 mm copper pad footprint; optimized for thermal dissipation and automated placement. |
Pinout & Package
DO-214AB (SMCJ) package: molded plastic case with J-bend leads, matte tin-plated terminals solderable per J-STD-020 and JESD 22-B102. Bi-directional construction means no polarity marking; both terminals are electrically symmetrical.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Both terminals serve identical avalanche clamping function in either polarity; no cathode band marking required for bi-directional operation. |
| Case (body) | Thermal and mechanical interface | Plastic body provides UL 94 V-0 flammability rating; thermal path relies on copper pad area (0.31" × 0.31") per terminal for RθJA = 75 °C/W. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, humidity bias HAST, and mechanical shock - required for engine control, ADAS, and infotainment modules. |
| Bi-directional clamping symmetry | Identical VBR (56.7–62.7 V) and VC (82.4 V) in both directions - eliminates need for polarity-aware layout in AC-coupled or floating signal paths. |
| Low incremental surge resistance | Enables stable clamping voltage under high di/dt transients (e.g., ISO 7637-2 pulse 5a); reduces overshoot risk compared to higher-Rsurge TVS devices. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life before reflow; compatible with standard SMT assembly without dry-pack or baking requirements. |
| Glass passivated junction | Ensures long-term stability of breakdown voltage and leakage current under thermal stress and humidity exposure - critical for 15-year automotive service life. |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface |
|---|---|
|
Use Scenario: Protecting LIN bus or 12 V supply rail against load dump (ISO 7637-2 Pulse 5) and alternator ripple in vehicle ECUs. IC Role / Device Role / Timing Role: Primary clamping element placed upstream of LDO regulators and microcontroller power inputs. Use Value: Limits transient voltage to ≤82.4 V during 1500 W surges, preventing latch-up or gate oxide damage in downstream 5 V/3.3 V logic. |
Use Scenario: Shielding analog outputs (e.g., 4–20 mA current loop) and digital I/O (RS-485, CAN FD) in factory automation sensors. IC Role / Device Role / Timing Role: Bidirectional shunt protector on differential signal pairs and ungrounded power feeds. Use Value: Sub-1 ns response time and <1 μA leakage preserve signal fidelity while absorbing ±1 kV EFT bursts per IEC 61000-4-4. |
| Telecom DC Power Input | Consumer Device USB Port |
|
Use Scenario: Safeguarding PoE-powered equipment (e.g., IP cameras, wireless APs) against induced surges on 48 V DC input lines. IC Role / Device Role / Timing Role: First-stage transient suppressor before DC-DC converter input filter. Use Value: 1500 W PPPM rating handles telecom-grade lightning-induced surges (IEC 61000-4-5 Level 3: 2 kV line-earth) without degradation. |
Use Scenario: Overvoltage protection on VBUS and D+/D− lines of USB-C ports in laptops and docking stations. IC Role / Device Role / Timing Role: Bi-directional clamp between data lines and ground to suppress ESD (±15 kV contact) and cable discharge events. Use Value: Symmetrical clamping prevents signal inversion or common-mode distortion during fast transients, maintaining USB 2.0 signal integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC51C-TB-E3/9AT | Same VWM (51 V), lower PPPM (600 W), smaller DO-214AA (SMA) package with higher RθJA (100 °C/W). | Limited to lower-energy transients (e.g., IEC 61000-4-2 ESD only); unsuitable for load dump or lightning surges. | Select when board space is constrained and surge threat level is limited to human-body-model ESD. |
| SMCJ51CAHE3/9AT | Identical electrical specs but AEC-Q101 qualified version (HE3 suffix); same DO-214AB package and marking code GFZ. | Required for automotive OEM production; includes extended reliability testing and traceable lot documentation. | Choose for Tier 1 automotive programs where full AEC-Q101 certification and PPAP support are mandatory. |
Compared with SMCJ51C-E3/9AT, SAC51C-TB-E3/9AT trades surge capacity for compactness, while SMCJ51CAHE3/9AT adds certified automotive qualification without altering clamping behavior - enabling direct substitution where qualification scope differs.
Availability
SMCJ51C-E3/9AT is available at Aetrix Electronics and suitable for automotive power line protection, industrial sensor interface hardening, and telecom DC input surge suppression requiring stable component supply and RoHS-compliant sourcing.
Supply support for SMCJ51C-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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SMCJ series targets high-energy transient suppression in harsh environments, with design focus on automotive, industrial, and telecom infrastructure where AEC-Q101 compliance and 1500 W surge capability are essential.
FAQ
What is the key difference between SMCJ51C-E3/9AT and SMCJ51A-E3/9AT?
The "C" suffix in SMCJ51C-E3/9AT denotes bi-directional functionality, meaning it clamps symmetrically in both polarities with no cathode marking. In contrast, SMCJ51A-E3/9AT is uni-directional, featuring a cathode band and forward voltage drop (~3.5 V at 100 A). This makes SMCJ51C-E3/9AT ideal for AC-coupled or floating signal lines, whereas SMCJ51A-E3/9AT suits DC power rail protection where polarity is fixed. Both share identical VWM (51 V) and PPPM (1500 W).
Does SMCJ51C-E3/9AT meet AEC-Q101 qualification?
No - SMCJ51C-E3/9AT carries the commercial-grade E3 suffix and is not AEC-Q101 qualified. For automotive applications requiring formal qualification, use SMCJ51CAHE3/9AT instead, which shares identical electrical specs but includes full AEC-Q101 testing and documentation. The "HE3" suffix explicitly indicates AEC-Q101 compliance per Vishay's ordering nomenclature.
What is the recommended PCB pad layout for optimal thermal performance of SMCJ51C-E3/9AT?
Vishay specifies mounting on 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal to achieve the rated RθJA of 75 °C/W. Use solid internal or external copper planes connected via multiple thermal vias (≥4 per pad, 0.3 mm diameter) to inner layers. Avoid narrow traces between pads and ensure ≥0.5 mm solder mask opening around each pad to maximize thermal mass and minimize junction temperature rise during 1500 W surges.
Can SMCJ51C-E3/9AT be used in place of a uni-directional TVS like SMAJ51A?
Yes, but only if polarity independence is acceptable and clamping symmetry is beneficial - e.g., protecting differential pairs or AC signals. However, SMCJ51C-E3/9AT cannot replace SMAJ51A in DC applications requiring forward conduction (e.g., reverse-polarity protection), since its bi-directional structure lacks defined anode/cathode behavior. Always verify system-level polarity constraints before substitution.
What does the "9AT" in SMCJ51C-E3/9AT indicate?
The "9AT" is Vishay's package code denoting 13-inch diameter plastic tape-and-reel packaging containing 3500 units per reel. It is distinct from "57T" (7-inch reel, 850 units) and does not affect electrical or thermal specifications. The "E3" suffix confirms RoHS compliance and commercial-grade qualification, while "C" identifies bi-directional configuration - all three elements are essential for correct part identification and procurement.
SMCJ51C-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:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 51V
- Voltage - Breakdown (Min):
- 56.7V
- Voltage - Clamping (Max) @ Ipp:
- 91.1V
- Current - Peak Pulse (10/1000µs):
- 16.5A
- 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)
SMCJ51C-E3/9AT FAQ
1.How can I place an order for SMCJ51C-E3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ51C-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 SMCJ51C-E3/9AT reliable?
The price and inventory of SMCJ51C-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 SMCJ51C-E3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ51C-E3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ51C-E3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ51C-E3/9AT?
SMCJ51C-E3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ51C-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 SMCJ51C-E3/9AT?
For technical support, including SMCJ51C-E3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ51C-E3/9AT requirements.
6.How does Aetrix verify that SMCJ51C-E3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ51C-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 SMCJ51C-E3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ51C-E3/9AT?
All SMCJ51C-E3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ51C-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 SMCJ51C-E3/9AT part is unused and in its original packaging.
Return procedure for SMCJ51C-E3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ51C-E3/9AT Tags
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DESD3V3E1BL-7B
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Diodes Incorporated
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