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Taiwan Semiconductor Corporation SMCJ75
- Part No.:
- SMCJ75
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ75.pdf
- Description:
- 1500W, 92.7V, 10%, UNIDIRECTIONA
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
SMCJ75 from Taiwan Semiconductor is a unidirectional 1500W surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with 75V working stand-off voltage (VWM), 83.3–102V breakdown voltage (VBR), and 134V maximum clamping voltage (VC) at 11.7A peak pulse current - designed for automotive load-dump and inductive switching protection in power supply rails.
For engineers reviewing the SMCJ75 datasheet, SMCJ75 pinout, SMCJ75 application, or SMCJ75 equivalent, key selection factors include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, junction temperature limits up to +150°C, moisture sensitivity level 1 compliance, and unidirectional polarity marking for correct PCB orientation.
Technical Context
The SMCJ75 operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its VBR range (83.3–102V @ IT = 1mA), clamping transients to ≤134V within <1.0ps response time. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1μA @ 75V).
Thermally, it features RθJA = 55°C/W and RθJC = 10°C/W, enabling reliable 5W steady-state dissipation at 25°C ambient. It meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements for high-reliability industrial and automotive PCBs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 75 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 83.3 / 102 V @ 1 mA - Confirmed avalanche onset range for robust overvoltage margin |
| VC @ IPPM | 134 V @ 11.7 A - Clamped voltage during 10/1000μs surge, defining protected circuit stress limit |
| PPK | 1500 W - Peak pulse power handling per single 1ms transient, per Fig.5 waveform |
| TJ max | +150 °C - Maximum junction temperature enabling operation in under-hood automotive environments |
| IR @ VWM | <1 μA - Negligible leakage at rated stand-off, minimizing standby power loss |
| Package | DO-214AB (SMC) - Standardized surface-mount outline with cathode band marking and 0.210g mass |
Pinout & Package
DO-214AB (SMC) package: molded plastic case with matte tin-plated leads, polarity indicated by cathode band on one end; compliant with J-STD-002 solderability and JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to system ground or low-side return path in unidirectional configuration |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., 12V rail); cathode band marks this terminal on PCB silkscreen |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity |
| ISO 7637-2 compliance | Validated for Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line impedance coupling) |
| Fast response time | <1.0 ps - Limits voltage overshoot before clamping engages, critical for protecting fast logic ICs |
| Moisture sensitivity level 1 | Enables standard SMT reflow without baking, reducing manufacturing overhead |
| Halogen-free & RoHS | Meets IEC 61249-2-21 and EU RoHS directives for environmentally compliant production |
Applications
| Automotive Power Rail Protection | Industrial PLC Input Protection |
|---|---|
Use Scenario: 12V battery-fed ECU power input subjected to load-dump transients up to 35V and ISO 7637-2 Pulse 5a. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp surges before they reach DC-DC converters and microcontrollers. Use Value: Limits rail voltage to ≤134V during 11.7A transients, preventing latch-up or permanent damage to downstream 3.3V/5V logic. | Use Scenario: 24V digital input channel on programmable logic controller exposed to relay coil flyback and EFT bursts. IC Role / Device Role / Timing Role: Front-end transient suppressor on signal conditioning path, upstream of optocoupler or Schmitt trigger. Use Value: Absorbs 1500W pulses while maintaining <1μA leakage at 24V nominal, preserving input threshold accuracy and noise immunity. |
| LED Driver Overvoltage Clamp | Telecom Power Interface Protection |
Use Scenario: Constant-current LED driver board powered from 48V PoE-derived supply, vulnerable to hot-swap and cable discharge events. IC Role / Device Role / Timing Role: Primary overvoltage clamp on bulk input capacitor, shunting energy away from MOSFET gate drivers and current-sense amplifiers. Use Value: Clamps 75V-rated input to 134V during 10/1000μs surges, avoiding overvoltage failure of 100V-rated input capacitors and FETs. | Use Scenario: Central office power feed interface handling -48V DC with lightning-induced common-mode transients on tip/ring lines. IC Role / Device Role / Timing Role: Unidirectional TVS on each conductor relative to ground, providing asymmetrical surge suppression aligned with telecom grounding schemes. Use Value: Delivers 1500W peak power rating with 134V clamping, meeting GR-1089-CORE Level 3 surge immunity requirements for network equipment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ75A | 600W rating, SMB package (smaller footprint), lower IPPM (6.5A), higher VC (121V) | Lower power handling suits consumer-grade 24V systems; not suitable for automotive load-dump | Select SMCJ75 for 1500W demands; SMBJ75A only where space-constrained and surge energy is ≤600W |
| 1.5SMC75A | Same 1500W rating and DO-214AB package, but from ON Semiconductor; VBR 83.3–92.1V, VC 121V @ 13A | Identical mechanical fit and thermal profile; minor VBR/VC variance affects clamping margin in precision rails | Drop-in replacement if BOM allows alternate sourcing; verify VC margin against protected IC absolute max ratings |
Compared with SMBJ75A and 1.5SMC75A, the SMCJ75 offers superior surge energy absorption (1500W vs. 600W) and tighter clamping consistency across temperature, making it preferred for automotive and industrial 12V/24V/48V power rail protection where transient severity is highest.
Availability
SMCJ75 is available at Aetrix Electronics and suitable for automotive electronics, industrial PLCs, LED lighting drivers, and telecom power interfaces requiring stable component supply across extended temperature ranges and high-reliability surge environments.
Supply support for SMCJ75 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 power management devices.
The SMCJ series belongs to TSC's high-power transient suppression product line, engineered specifically for ISO 7637-2-compliant automotive and industrial applications demanding 1500W pulse handling in compact surface-mount packages.
FAQ
What is the clamping voltage of the SMCJ75 under standard test conditions?
The SMCJ75 has a maximum clamping voltage (VC) of 134 V at 11.7 A peak pulse current (IPPM), measured using the 10/1000 μs double-exponential surge waveform per Fig.5 in the datasheet. This value defines the upper voltage limit imposed on protected circuits during worst-case transients and must be compared against the absolute maximum ratings of downstream components to ensure safe operation.
Is the SMCJ75 unidirectional or bidirectional, and how is polarity marked?
The SMCJ75 is a unidirectional TVS diode, intended for use in DC circuits where reverse voltage protection is required only on one polarity. Polarity is marked by a cathode band on the DO-214AB (SMC) package body - the banded end connects to the protected line (e.g., 12V rail), while the unbanded end connects to ground. Bidirectional variants carry a "C" or "CA" suffix (e.g., SMCJ75C).
Does the SMCJ75 meet automotive transient immunity standards?
Yes, the SMCJ75 meets ISO 7637-2 Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line impedance coupling) requirements. Its 1500W peak power rating, fast <1.0 ps response time, and specified clamping behavior under standardized waveforms make it suitable for front-end protection in automotive ECUs, body control modules, and infotainment power supplies.
What is the maximum steady-state power dissipation for the SMCJ75 at room temperature?
The SMCJ75 has a steady-state power dissipation (PD) rating of 5 W at TA = 25°C, derating linearly above that ambient temperature per Fig.2 in the datasheet. This rating applies only to continuous DC or low-frequency reverse leakage conditions - not to transient events - and supports thermal design of adjacent components and PCB copper area allocation.
Can the SMCJ75 be used in bidirectional AC applications?
No, the SMCJ75 is unidirectional and not rated for bidirectional operation. For AC or dual-polarity transient suppression, select the SMCJ75C or SMCJ75CA variant, which features symmetrical breakdown in both directions and identical electrical specifications in forward and reverse bias. Using the SMCJ75 in AC applications risks catastrophic failure due to forward conduction during negative half-cycles.
SMCJ75 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):
- 75V
- Voltage - Breakdown (Min):
- 83.3V
- Voltage - Clamping (Max) @ Ipp:
- 134V
- Current - Peak Pulse (10/1000µs):
- 11.7A
- 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)
SMCJ75 FAQ
1.How can I place an order for SMCJ75 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ75 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 SMCJ75 reliable?
The price and inventory of SMCJ75 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ75 is usually 5 days.
3.What payment methods are accepted for SMCJ75?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ75 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ75?
SMCJ75 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ75 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 SMCJ75?
For technical support, including SMCJ75 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ75 requirements.
6.How does Aetrix verify that SMCJ75 is sourced from the original manufacturer or authorized distributors?
All SMCJ75 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 SMCJ75 meets industry standards.
7.What is the process for return or replacement of SMCJ75?
All SMCJ75 units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ75, 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 SMCJ75 part is unused and in its original packaging.
Return procedure for SMCJ75:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ75 Tags
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