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Taiwan Semiconductor Corporation SMCJ51CH
- Part No.:
- SMCJ51CH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ51CH.pdf
- Description:
- 1500W, 63V, 10%, BIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:4,138
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Product details
Overview
SMCJ51CH from Taiwan Semiconductor is a unidirectional 1500W transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, designed for high-energy surge protection in automotive and industrial power rails. It features a 51V working stand-off voltage (VWM), 56.7–69.3V breakdown voltage (VBR), 91.1V maximum clamping voltage (VC) at 17A peak pulse current, and AEC-Q101 qualification for automotive reliability.
For engineers reviewing the SMCJ51CH datasheet, SMCJ51CH pinout, SMCJ51CH application, or SMCJ51CH equivalent, this device is selected for robust ESD and load-dump immunity in 12V/24V vehicle subsystems, telecom DC inputs, and industrial I/O protection where fast response (<1ps), low leakage (<1µA @ 51V), and ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance are critical.
Technical Context
The SMCJ51CH employs a glass-passivated silicon junction optimized for unidirectional surge suppression. Its thermal design supports 150°C max junction temperature with RθJA = 55°C/W and RθJC = 10°C/W, enabling reliable operation under sustained transients in enclosed enclosures.
It delivers 1500W peak pulse power (tp = 1ms) per IEC 61000-4-5 and meets ISO 7637-2 test pulses without derating below 25°C ambient. The device exhibits <1.0ps response time from 0V to VBR min and maintains <1µA reverse leakage above 10V - consistent with its 51V VWM rating.
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 process variation |
| VC @ IPPM | 91.1 V @ 17 A - Limits downstream voltage stress during 1ms 1500W surge |
| PPK | 1500 W - Withstands automotive load dump and ISO 7637-2 Pulse 5a surges |
| IR @ VWM | <1 µA - Negligible standby power loss in battery-backed systems |
| TJ max | +150 °C - Supports under-hood deployment without thermal derating penalties |
| Package | DO-214AB (SMC) - Surface-mount footprint compatible with automated assembly and IPC-7351B standard |
Pinout & Package
DO-214AB (SMC) package: molded plastic case with matte tin-plated leads, polarity indicated by cathode band, weight ≈ 0.210 g, UL 94V-0 rated compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction path | Connected to system ground or lower-potential rail in unidirectional configuration |
| Cathode | Clamping output node | Connected to protected line (e.g., 12V supply); conducts when voltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing |
| Glass passivated junction | Enhances long-term stability and moisture resistance vs. epoxy-passivated alternatives |
| ISO 7637-2 compliant | Passes Pulse 1 (inductive load disconnect), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line impedance coupling) |
| Fast response time | <1.0 ps from 0 V to VBR min - limits voltage overshoot before clamping engages |
| Low moisture sensitivity | MSL Level 1 per J-STD-020 - no baking required prior to reflow soldering |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Protection |
|---|---|
Use Scenario: Protecting LIN bus power rail and sensor supply lines against load dump and alternator ripple in BCM units. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between 12V input and ground, absorbing 1500W transients within 1ms. Use Value: Prevents latch-up or damage to MCU I/O and linear regulators during ISO 7637-2 Pulse 5a events up to 35V/100ms. | Use Scenario: Shielding 24V digital input channels on programmable logic controllers from field-wiring induced surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp on each opto-isolator input side, triggered before internal Zener or TVS elements activate. Use Value: Enables >100,000 surge cycles without degradation due to low IR and stable VBR tolerance (±5% typical). |
| Telecom Power Supply Input | Medical Diagnostic Equipment DC Rails |
Use Scenario: Safeguarding AC/DC adapter outputs feeding base station RF modules against lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Secondary-stage TVS on +48V DC output, coordinated with upstream MOVs and gas discharge tubes. Use Value: Clamps to ≤91.1V within 1ps, limiting stress on downstream DC-DC converters rated for 60V absolute max. | Use Scenario: Protecting isolated 5V/3.3V auxiliary supplies in portable ultrasound scanners exposed to ESD during clinical handling. IC Role / Device Role / Timing Role: Final-line ESD suppressor on low-voltage rails feeding ADC reference buffers and precision op-amps. Use Value: Delivers <1µA leakage at 51V VWM to preserve battery life while meeting IEC 61000-4-2 Level 4 (15kV air/8kV contact) immunity. |
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 rating, SMB package (smaller footprint), higher RθJA = 85°C/W | Lower energy handling; suitable only for sub-600W transients like ESD or small inductive spikes | Select when board space is constrained and surge energy is limited to IEC 61000-4-5 Line 1/2 (≤600W) |
| 1.5KE51A | Through-hole TO-204AA (DO-41), same 1500W rating but slower response (~1ns) and no AEC-Q101 qualification | Lacks automotive qualification and surface-mount compatibility; requires wave soldering | Choose for legacy through-hole designs or cost-sensitive non-automotive industrial use where AEC-Q101 is not mandated |
Compared with SMBJ51A and 1.5KE51A, the SMCJ51CH provides superior automotive-grade reliability, faster clamping, and surface-mount scalability - making it the preferred choice for new 12V/24V electronic control units requiring ISO 7637-2 compliance and zero rework risk in SMT lines.
Availability
SMCJ51CH is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC I/O modules, telecom power interfaces, and medical diagnostic equipment requiring stable component supply across multi-year production cycles.
Supply support for SMCJ51CH 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 TVS diodes, rectifiers, MOSFETs, and automotive-qualified components.
The SMCJ series was developed specifically for high-reliability transient suppression in automotive and industrial environments, emphasizing AEC-Q101 compliance, ISO 7637-2 pulse immunity, and robust thermal performance in compact SMC packages.
FAQ
What is the clamping voltage of the SMCJ51CH under a 1500W surge?
The SMCJ51CH has a maximum clamping voltage (VC) of 91.1 V at 17 A peak pulse current (IPPM), corresponding to its 1500W 1ms surge rating. This value is measured per Fig.5 waveform (10/1000μs) and ensures downstream ICs see less than 91.1 V during worst-case transients. The SMCJ51CH maintains this clamping performance across its full operating temperature range (−55°C to +150°C).
Is the SMCJ51CH bidirectional or unidirectional?
The SMCJ51CH is a unidirectional TVS diode, indicated by the "H" suffix and absence of "CH" or "CAH" designation. It conducts only in reverse bias above VBR, with anode tied to ground and cathode to the protected line. For bidirectional protection, select SMCJ51CH (which uses "CH" suffix) - a distinct part with symmetrical clamping in both polarities.
Does the SMCJ51CH meet AEC-Q101 requirements?
Yes, the SMCJ51CH is explicitly AEC-Q101 qualified per the manufacturer's datasheet (Version A2102). It undergoes stress testing including high-temperature reverse bias (HTRB), temperature cycling, and ESD per AEC-Q101-004, confirming suitability for automotive powertrain, chassis, and body electronics applications.
What is the maximum reverse leakage current for the SMCJ51CH at its working voltage?
The SMCJ51CH exhibits a maximum reverse leakage current (IR) of 1 µA at its 51 V working stand-off voltage (VWM). This ultra-low leakage preserves battery life in always-on automotive modules and prevents false triggering in high-impedance sensing circuits. Leakage remains stable over temperature and lifetime due to glass passivation.
Can the SMCJ51CH be used in place of the SMCJ51A?
No - the SMCJ51CH and SMCJ51A are electrically distinct. The SMCJ51CH has tighter VBR tolerance (56.7–69.3 V) versus SMCJ51A (56.7–62.7 V), resulting in higher clamping consistency. Additionally, the "CH" variant is unidirectional with cathode marking, while "A" denotes a different breakdown spread. Substitution requires validation of VBR, VC, and layout polarity alignment for the SMCJ51CH.
SMCJ51CH 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:
- -
- Bidirectional Channels:
- 1
- 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)
SMCJ51CH FAQ
1.How can I place an order for SMCJ51CH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ51CH 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 SMCJ51CH reliable?
The price and inventory of SMCJ51CH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ51CH is usually 5 days.
3.What payment methods are accepted for SMCJ51CH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ51CH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ51CH?
SMCJ51CH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ51CH 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 SMCJ51CH?
For technical support, including SMCJ51CH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ51CH requirements.
6.How does Aetrix verify that SMCJ51CH is sourced from the original manufacturer or authorized distributors?
All SMCJ51CH 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 SMCJ51CH meets industry standards.
7.What is the process for return or replacement of SMCJ51CH?
All SMCJ51CH units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ51CH, 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 SMCJ51CH part is unused and in its original packaging.
Return procedure for SMCJ51CH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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