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Taiwan Semiconductor Corporation SMCJ51H
- Part No.:
- SMCJ51H
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ51H.pdf
- Description:
- 1500W, 63V, 10%, UNIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:5,254
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Product details
Overview
SMCJ51H from Taiwan Semiconductor is a unidirectional 1500W surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with 51V working stand-off voltage (VWM), 56.7–69.3V breakdown voltage (VBR), and 91.1V maximum clamping voltage (VC) at 17A peak impulse current-designed for automotive-grade ESD and surge protection in power supply inputs of industrial control systems.
For engineers reviewing the SMCJ51H datasheet, SMCJ51H pinout, SMCJ51H application, or SMCJ51H equivalent, this part delivers AEC-Q101 qualification, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, sub-1ps response time, <1µA reverse leakage above 10V, and UL 94V-0 molding-critical for robust front-end protection in harsh electrical environments.
Technical Context
The SMCJ51H operates as a unidirectional avalanche diode, clamping transients by entering breakdown when reverse voltage exceeds VBR (min 56.7V at 1mA), limiting downstream voltage to ≤91.1V at 17A 10/1000µs pulse. Its glass-passivated junction ensures stable VBR tolerance and low leakage under steady-state bias.
Thermal performance is defined by RθJA = 55°C/W and RθJC = 10°C/W, supporting continuous operation up to TJ = 150°C. It meets JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity-enabling reliable reflow assembly without preconditioning.
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 / 69.3 V @ 1 mA - Ensures predictable turn-on across temperature and unit variation |
| VC @ IPPM | 91.1 V @ 17 A - Limits protected circuit voltage during worst-case 10/1000µs surge |
| PPK | 1500 W - Peak pulse power handling per single non-repetitive event |
| IR @ VWM | <1 µA - Negligible standby power loss and signal integrity impact |
| Package | DO-214AB (SMC) - Standardized surface-mount footprint compatible with automated placement |
| TJ max | +150 °C - Enables use in under-hood automotive and high-ambient industrial environments |
Pinout & Package
DO-214AB (SMC) package: molded plastic case with matte tin-plated leads, cathode band marking polarity, 0.210g weight, UL 94V-0 flammability rating, and JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Reverse-biased anode connection point | Connected to protected line; conducts during overvoltage to shunt energy to ground |
| Anode | Reference/ground return path | Typically tied to system ground plane; completes clamping current path during transient |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements including HTOL, TC, UHAST, and ESD |
| ISO 7637-2 compliance | Withstands load-dump (Pulse 5a/b), supply transients (Pulse 1/2a/2b), and coupling noise (Pulse 3a/3b) |
| Glass-passivated junction | Stable VBR drift <±5% over 1000h HTOL; enables tight parametric binning and long-term reliability |
| Sub-1ps response time | Clamps ESD events before sensitive ICs experience damage-critical for USB, CAN, and sensor interfaces |
| Level 1 moisture sensitivity | Zero bake requirement prior to reflow; supports standard SMT line throughput without process interruption |
Applications
| Automotive Power Input Protection | Industrial PLC I/O Module |
|---|---|
Use Scenario: 12V/24V battery-fed ECUs exposed to load dump and jump-start surges. IC Role / Device Role / Timing Role: Primary front-end TVS clamp on main power rail, placed upstream of DC-DC converters and LDOs. Use Value: Limits input voltage to ≤91.1V during 17A ISO 7637-2 Pulse 5a (load dump), preventing converter latch-up or MOSFET avalanche failure. | Use Scenario: Digital input channels receiving 24V dry-contact signals in factory automation cabinets. IC Role / Device Role / Timing Role: Bidirectional transient suppression on field-side signal lines, often paired with optocouplers. Use Value: Absorbs inductive kickback from solenoid coils and relay contacts while maintaining <1µA leakage for accurate logic-level detection. |
| Telecom Power Feeds | Medical Equipment Auxiliary Supplies |
Use Scenario: -48V DC power distribution in base station remote radio units (RRUs). IC Role / Device Role / Timing Role: Unidirectional clamping device on primary DC input, coordinated with upstream fuses and secondary filtering. Use Value: Survives repeated lightning-induced surges per IEC 61000-4-5 (10/700µs) with no parameter shift after 1000 pulses. | Use Scenario: Isolated auxiliary 5V/12V supplies powering display controllers and communication modules in diagnostic imaging devices. IC Role / Device Role / Timing Role: Secondary-side TVS on low-voltage rails where creepage/clearance constraints limit MOV use. Use Value: Provides certified surge immunity without galvanic coupling risk-meets IEC 60601-1 3rd ed. clause 8.8.3.3 for applied parts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ51A | 600W PPK rating, SMB package (smaller footprint), higher VC (93.6V @ 10.3A) | Limited to lower-energy transients; unsuitable for ISO 7637-2 Pulse 5a load dump | Select when board space is constrained and peak surge energy is ≤600W |
| 1.5KE51A | Through-hole DO-201 package, same 1500W rating but slower thermal recovery and no AEC-Q101 qualification | Not suitable for automotive or high-reliability automated assembly; requires wave solder or hand-solder | Select only for legacy through-hole designs where rework tolerance outweighs automotive compliance needs |
Compared with SMBJ51A and 1.5KE51A, the SMCJ51H provides superior surge robustness in surface-mount form with automotive qualification-making it the preferred choice for new automotive and industrial designs requiring both high PPK and production scalability.
Availability
SMCJ51H is available at Aetrix Electronics and suitable for automotive infotainment power rails, industrial PLC I/O protection, telecom DC feeds, and medical auxiliary supplies requiring stable component supply across multi-year production cycles.
Supply support for SMCJ51H 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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in high-reliability protection devices, rectifiers, and TVS diodes for automotive and industrial markets.
The SMCJ series is designed specifically for high-power transient suppression in demanding environments-emphasizing AEC-Q101 compliance, ISO 7637-2 immunity, and robust thermal performance in compact SMC packages.
FAQ
What is the clamping voltage of the SMCJ51H and how is it measured?
The SMCJ51H has a maximum clamping voltage (VC) of 91.1 V, measured at 17 A peak impulse current with a 10/1000 µs waveform per Fig.5 in the datasheet. This value represents the upper limit of voltage seen by downstream circuitry during a standardized surge event-and is guaranteed across temperature and production lot. The SMCJ51H maintains this clamping performance while delivering 1500 W peak power dissipation.
Is the SMCJ51H suitable for bidirectional transient protection?
No-the SMCJ51H is a unidirectional TVS diode intended for DC power line protection where polarity is fixed. For bidirectional applications such as AC lines or data buses, Taiwan Semiconductor offers the SMCJ51AH variant (marked GFZ), which features symmetrical breakdown in both directions. Using the SMCJ51H in reverse-biased AC configurations risks permanent failure due to forward conduction during negative half-cycles.
Does the SMCJ51H meet automotive qualification standards?
Yes-the SMCJ51H is explicitly AEC-Q101 qualified and tested per the full stress test schedule including high-temperature operating life (HTOL), temperature cycling (TC), unbiased highly accelerated stress test (UHAST), and human-body-model ESD. It also meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements-making it suitable for engine control units, body control modules, and ADAS power domains.
What is the thermal resistance profile of the SMCJ51H and how does it affect PCB layout?
The SMCJ51H has a junction-to-ambient thermal resistance (RθJA) of 55°C/W and junction-to-case (RθJC) of 10°C/W. To maintain TJ ≤150°C under 1500W pulse conditions, PCB layout must include ≥100 mm² of 2-oz copper connected to both terminals, with thermal vias under the pad area. The SMCJ51H's DO-214AB package relies on copper mass-not airflow-for heat dissipation during transient events.
How does the SMCJ51H compare to the SMCJ51AH variant?
The SMCJ51H is unidirectional with cathode band marking, while the SMCJ51AH is bidirectional and marked GFZ. Key differences include clamping voltage (91.1 V vs. 82.4 V at rated current), breakdown symmetry (asymmetric vs. matched ±56.7–62.7 V), and application scope (DC rails vs. AC/data lines). Both share identical package, AEC-Q101 qualification, and ISO 7637-2 compliance-but the SMCJ51AH enables simplified layout in differential or floating systems where polarity reversal occurs.
SMCJ51H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AB, SMC
- Series:
- SMCJ
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 51V
- Voltage - Breakdown (Min):
- 56.7V
- Voltage - Clamping (Max) @ Ipp:
- 91.1V
- Current - Peak Pulse (10/1000µs):
- 17A
- 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)
SMCJ51H FAQ
1.How can I place an order for SMCJ51H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ51H 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 SMCJ51H reliable?
The price and inventory of SMCJ51H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ51H is usually 5 days.
3.What payment methods are accepted for SMCJ51H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ51H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ51H?
SMCJ51H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ51H 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 SMCJ51H?
For technical support, including SMCJ51H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ51H requirements.
6.How does Aetrix verify that SMCJ51H is sourced from the original manufacturer or authorized distributors?
All SMCJ51H 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 SMCJ51H meets industry standards.
7.What is the process for return or replacement of SMCJ51H?
All SMCJ51H units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ51H, 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 SMCJ51H part is unused and in its original packaging.
Return procedure for SMCJ51H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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