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Taiwan Semiconductor Corporation SMCJ51
- Part No.:
- SMCJ51
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ51.pdf
- Description:
- 1500W, 63V, 10%, UNIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:2,800
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Product details
Overview
SMCJ51 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 pulse current - designed for automotive load-dump and inductive switching surge protection in power supply rails.
For engineers reviewing the SMCJ51 datasheet, SMCJ51 pinout, SMCJ51 application, or SMCJ51 equivalent, key selection criteria include clamping voltage margin vs. protected IC VDD rating, peak pulse current capability under ISO 7637-2 Pulse 5a, thermal derating above 25°C ambient, and unidirectional polarity marking alignment on PCB layout.
Technical Context
This TVS operates as a voltage-clamped shunt protector: when reverse voltage exceeds VBR (56.7–69.3V), it avalanches to limit transient energy by diverting surge current away from downstream circuitry. Its glass-passivated junction ensures stable breakdown and low leakage (<1µA @ 51V).
It meets ISO 7637-2 Pulse 1 (inductive flyback), Pulse 2a/2b (battery disconnection & load dump), and Pulse 3a/3b (capacitive coupling), with <1.0ps response time and 10°C/W junction-to-case thermal resistance enabling high-energy dissipation without thermal runaway.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51 V - Maximum continuous reverse operating voltage before conduction begins; sets upper limit of protected rail voltage. |
| VBR min/max | 56.7 / 69.3 V @ 1 mA - Confirmed avalanche onset range; ensures reliable triggering above system nominal voltage. |
| VC @ IPPM | 91.1 V @ 17 A - Clamped voltage during 10/1000 µs surge; must stay below absolute max rating of protected ICs. |
| PPK | 1500 W - Peak pulse power handling per single 10/1000 µs waveform; defines transient energy absorption capacity. |
| IR @ VWM | <1 µA - Reverse leakage at rated stand-off; negligible power loss and signal integrity impact in standby. |
| TJ max | +150 °C - Maximum junction temperature; supports operation in under-hood automotive environments. |
| RθJC | 10 °C/W - Junction-to-case thermal resistance; enables effective heatsinking via PCB copper pour or metal-core substrate. |
Pinout & Package
DO-214AB (SMC) surface-mount package with cathode band marking on one end; bidirectional variants use "C" or "CA" suffix, but SMCJ51 is unidirectional and polarity-sensitive.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or low-impedance return path; forms current sink during clamping event. |
| Cathode | High-side surge input terminal | Connected to protected line (e.g., 48V rail); marked by band; carries full transient current into anode. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable, repeatable VBR over lifetime and temperature; eliminates parameter drift due to moisture or contamination. |
| ISO 7637-2 compliance | Validated for Pulse 1, 2a, 2b, 3a, 3b - directly qualifies for automotive ECU front-end protection without additional filtering. |
| Fast response time | <1.0 ps - triggers before most semiconductor damage thresholds are exceeded; critical for protecting fast logic and analog inputs. |
| Moisture sensitivity level 1 | No floor-life limitation or bake requirement before reflow; simplifies SMT assembly and inventory management. |
| Halogen-free & RoHS compliant | Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU - required for global automotive and industrial product certifications. |
Applications
| Automotive Power Distribution | Industrial Motor Drive Protection |
|---|---|
Use Scenario: 48V mild-hybrid vehicle battery rail exposed to load dump transients up to 60V. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between battery input and DC-DC converter input stage. Use Value: Clamps surges to ≤91.1V within 1ps, preventing overvoltage failure of 100V-rated input MOSFETs and gate drivers. |
Use Scenario: H-bridge gate driver supply rail subjected to inductive kickback during motor commutation. IC Role / Device Role / Timing Role: Standoff-rated TVS across VDD-GND of half-bridge driver IC (e.g., DRV8305). Use Value: Limits voltage overshoot to safe levels during 200A+ turn-off events, avoiding latch-up or oxide rupture in CMOS logic. |
| LED Driver Input Protection | Telecom DC Feeder Line Protection |
Use Scenario: Constant-current LED string powered from 51V industrial supply with frequent hot-plug events. IC Role / Device Role / Timing Role: Primary surge clamp at input filter stage upstream of buck controller (e.g., LM3492). Use Value: Absorbs 1500W pulses without degradation, maintaining >100k-cycle reliability under repeated EFT exposure. |
Use Scenario: -48V telecom power feed line exposed to lightning-induced surges on outdoor plant wiring. IC Role / Device Role / Timing Role: First-line unidirectional TVS on DC input before DC-DC isolation stage. Use Value: Withstands 17A 10/1000µs impulses while holding clamping voltage below -60V absolute rating of downstream SiC rectifiers. |
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, same VWM/VBR/VC specs but lower surge capacity; DO-214AA (SMB) package. | Lower energy handling limits use to sub-10A surge environments (e.g., consumer IoT, not automotive). | Select SMBJ51A only if board space constraints prevent DO-214AB placement and surge threat level is ≤600W. |
| 1.5KE51A | Through-hole TO-204AA (DO-41) package; identical electrical specs but no ISO 7637-2 validation or SMT process compatibility. | Not suitable for automated assembly or vibration-prone environments; requires manual soldering or wave-solder fixturing. | Choose 1.5KE51A only for legacy through-hole designs where re-layout is prohibited and thermal mass is sufficient. |
Compared with SMCJ51, SMBJ51A offers footprint reduction at 60% peak power trade-off, while 1.5KE51A retains identical clamping performance but sacrifices SMT scalability and automotive qualification - making SMCJ51 the optimal choice for new 48V/24V automotive and industrial SMT designs requiring 1500W immunity.
Availability
SMCJ51 is available at Aetrix Electronics and suitable for automotive ECU design, industrial motor control systems, LED lighting power supplies, and telecom DC feeder protection requiring stable component supply across multi-year production cycles.
Supply support for SMCJ51 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 Taiwanese manufacturer specializing in discrete power semiconductors, including TVS diodes, rectifiers, and MOSFETs for automotive and industrial markets.
The SMCJ series was developed specifically for high-reliability 1500W transient suppression in automotive power networks and industrial equipment subject to ISO 7637-2 and IEC 61000-4-5 stress profiles.
FAQ
What is the clamping voltage of SMCJ51 and how is it measured?
The SMCJ51 has a maximum clamping voltage (VC) of 91.1 V at 17 A peak pulse current (IPPM), tested using a 10/1000 µs waveform per Fig.5 in the datasheet. This value represents the highest voltage seen across the device during standardized surge testing and is critical for ensuring protected ICs remain within their absolute maximum ratings.
Is SMCJ51 suitable for bidirectional transient protection?
No - SMCJ51 is a unidirectional TVS diode, intended for DC circuits with defined polarity. For bidirectional AC or dual-rail applications, select SMCJ51C or SMCJ51CA, which feature symmetrical breakdown in both directions and use "C" or "CA" suffixes per TSC's ordering code convention.
Does SMCJ51 meet automotive qualification standards?
Yes - SMCJ51 meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements for electrical disturbances in road vehicles. It is widely deployed in automotive body control modules, ADAS power supplies, and 48V mild-hybrid systems where certified surge immunity is mandatory.
What is the thermal resistance of SMCJ51 and how does it affect PCB layout?
SMCJ51 has a junction-to-case thermal resistance (RθJC) of 10 °C/W. To maintain TJ ≤ 150 °C during repetitive surges, PCB layout must provide adequate copper area (≥100 mm² per side) under the cathode/anode pads and minimize trace length to ground planes - especially critical in high-ambient-temperature environments.
How does SMCJ51 differ from SMCJ51A?
SMCJ51A has tighter VBR tolerance (56.7–62.7 V vs. 56.7–69.3 V for SMCJ51) and slightly lower clamping voltage (82.4 V vs. 91.1 V). Both share identical package, power rating, and application scope, but SMCJ51A is preferred where precise clamping threshold and reduced overshoot are required in sensitive analog or communication interfaces.
SMCJ51 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMCJ51 FAQ
1.How can I place an order for SMCJ51 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ51 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 SMCJ51 reliable?
The price and inventory of SMCJ51 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ51 is usually 5 days.
3.What payment methods are accepted for SMCJ51?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ51 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ51?
SMCJ51 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ51 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 SMCJ51?
For technical support, including SMCJ51 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ51 requirements.
6.How does Aetrix verify that SMCJ51 is sourced from the original manufacturer or authorized distributors?
All SMCJ51 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 SMCJ51 meets industry standards.
7.What is the process for return or replacement of SMCJ51?
All SMCJ51 units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ51, 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 SMCJ51 part is unused and in its original packaging.
Return procedure for SMCJ51:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ51 Tags
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