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Taiwan Semiconductor Corporation SMCJ75CH
- Part No.:
- SMCJ75CH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ75CH.pdf
- Description:
- 1500W, 92.7V, 10%, BIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:4,735
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Product details
Overview
SMCJ75CH from Taiwan Semiconductor is a bidirectional 75V stand-off, 134V clamping, 1500W surface-mount transient voltage suppressor in DO-214AB (SMC) package, designed for automotive-grade ESD and surge protection in power rails and signal lines of industrial control systems.
For engineers reviewing the SMCJ75CH datasheet, SMCJ75CH pinout, SMCJ75CH application, or SMCJ75CH equivalent, this device requires attention to its bidirectional polarity marking, 11.7A peak impulse current rating, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, and AEC-Q101 qualification for automotive deployment.
Technical Context
The SMCJ75CH implements a glass-passivated silicon avalanche junction optimized for fast transient response (<1.0 ps rise time from 0 V to VBR min) and low leakage (<1 µA at 75 V). Its unidirectional/bidirectional configuration is defined by suffix: "CH" denotes bidirectional operation with symmetrical electrical characteristics in both directions.
Thermal performance is characterized by RθJA = 55°C/W and RθJC = 10°C/W, supporting sustained operation up to TJ = +150°C. It meets JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 75 V - Maximum continuous reverse working voltage before clamping initiates |
| VBR @ IT=1 mA | 83.3–102 V - Breakdown voltage range confirming reliable avalanche onset under standardized test conditions |
| VC @ IPPM=11.7 A | 134 V - Clamping voltage limiting downstream circuit stress during 10/1000 µs surge events |
| PPK | 1500 W - Peak pulse power handling capacity per single 1 ms transient per Fig.5 |
| IPPM | 11.7 A - Maximum non-repetitive peak impulse current supported at rated clamping voltage |
| TJ max | +150 °C - Maximum junction temperature enabling use in under-hood automotive environments |
| Package | DO-214AB (SMC) - Standardized surface-mount outline with 0.210 g mass and matte tin-plated leads |
Pinout & Package
DO-214AB (SMC) package: molded plastic case meeting UL 94V-0 flammability rating; cathode band marking indicates polarity for unidirectional variants only - SMCJ75CH is bidirectional and marked without polarity band per standard configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional terminal pair | Identical avalanche behavior in either direction; no functional anode/cathode distinction - used across AC lines or floating differential buses |
| Case | Non-electrical mechanical interface | Thermally conductive but electrically isolated housing; no internal connection to die - mounting pad serves only thermal dissipation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements including HTOL, TC, UHAST, and ESD-HBM/MM |
| ISO 7637-2 compliance | Withstands Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (ignition noise) waveforms without degradation |
| Glass passivated junction | Enhances long-term reliability and stability of breakdown voltage under thermal cycling and humidity exposure |
| Fast response time | Typically <1.0 ps from 0 V to VBR min ensures suppression before sensitive ICs experience overvoltage damage |
| Low IR at VWM | <1 µA leakage at 75 V minimizes standby power loss and avoids false triggering in high-impedance monitoring circuits |
Applications
| Automotive Power Distribution | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting 12 V/24 V battery-fed ECUs against load dump and alternator transients per ISO 7637-2 Pulse 5a/5b. IC Role / Device Role / Timing Role: Primary clamping device placed at power entry point to limit rail voltage excursion to ≤134 V during 10/1000 µs surges. Use Value: Enables robust operation without derating DC/DC converters or microcontrollers due to controlled clamping at 134 V under 11.7 A peak current. |
Use Scenario: Safeguarding 24 V digital input modules in programmable logic controllers exposed to relay coil flyback and field wiring surges. IC Role / Device Role / Timing Role: Bidirectional TVS shunting transient energy on dry-contact inputs before signal conditioning circuitry. Use Value: Eliminates need for external series impedance or RC snubbers thanks to sub-1 ps response and symmetrical clamping in AC-coupled sensing paths. |
| Telecom Line Interface | Renewable Energy Monitoring |
Use Scenario: Shielding RS-485 transceivers in outdoor base stations from lightning-induced common-mode surges on twisted-pair data lines. IC Role / Device Role / Timing Role: Paired bidirectional SMCJ75CH devices implementing differential-mode suppression across A/B bus lines. Use Value: Maintains signal integrity up to 10 Mbps while clamping transients to safe levels below transceiver absolute maximum ratings. |
Use Scenario: Protecting voltage-sense inputs of solar charge controllers connected to PV string outputs subject to rapid irradiance changes and nearby lightning. IC Role / Device Role / Timing Role: Standoff-rated TVS absorbing induced surges on analog measurement paths without loading the high-impedance divider network. Use Value: Preserves measurement accuracy with <1 µA leakage at 75 V, avoiding offset drift in precision ADC front-ends. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ75CA | Lower peak power rating (600 W vs. 1500 W); SMB package (smaller footprint, higher RθJA) | Not suitable for ISO 7637-2 Pulse 5a/5b load dump; limited to lower-energy transients | Select when board space is constrained and surge energy does not exceed 600 W capability |
| 1.5KE75CA | Through-hole TO-218 package; same 75 V VWM, but higher VC (123 V) and lower IPPM (12.5 A) | Requires PCB through-hole real estate; less suitable for automated SMT assembly | Choose for legacy designs or where thermal mass of lead-frame aids long-duration surge handling |
Compared with SMBJ75CA and 1.5KE75CA, the SMCJ75CH delivers 2.5× higher peak power in an SMT-optimized package with AEC-Q101 and ISO 7637-2 validation - making it the preferred choice for new automotive and industrial designs requiring robust, automated, and standards-compliant surge immunity.
Availability
SMCJ75CH is available at Aetrix Electronics and suitable for automotive ECU protection, industrial PLC I/O hardening, and telecom line interface surge suppression requiring stable component supply across multi-year production cycles.
Supply support for SMCJ75CH 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 components.
The SMCJ series was developed specifically for high-reliability transient suppression in automotive and industrial environments, emphasizing AEC-Q101 qualification, ISO 7637-2 compliance, and robust glass-passivated junction technology.
FAQ
What does the "CH" suffix indicate in SMCJ75CH?
The "CH" suffix in SMCJ75CH designates a bidirectional configuration - meaning the device provides symmetrical avalanche clamping in both forward and reverse directions. Unlike unidirectional "H" variants, SMCJ75CH has no cathode band marking and is intended for AC-coupled or floating differential applications where polarity reversal may occur. This is confirmed in the datasheet's "Devices for bipolar applications" section.
Is SMCJ75CH compliant with AEC-Q101 and ISO 7637-2?
Yes, SMCJ75CH is explicitly qualified to AEC-Q101 and meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b test requirements as stated in the FEATURES section of the official Taiwan Semiconductor datasheet (Version A2102). These qualifications validate its suitability for automotive power and signal line protection without additional system-level derating.
What is the clamping voltage of SMCJ75CH at its rated peak current?
The maximum clamping voltage (VC) of SMCJ75CH is 134 V at IPPM = 11.7 A, measured using the 10/1000 µs double-exponential surge waveform per Fig.5. This value is specified in the ELECTRICAL SPECIFICATIONS table for SMCJ75H/SMCJ75AH and applies directly to SMCJ75CH as part of the same family with identical VWM and clamping performance.
Can SMCJ75CH replace unidirectional SMCJ75H in a circuit?
No - SMCJ75CH cannot directly replace unidirectional SMCJ75H without circuit review. While both share VWM = 75 V and VC = 134 V, the CH variant conducts in both directions and lacks polarity marking. Using it in place of a unidirectional device may cause unintended conduction in DC-biased rails. Verify bidirectional operation is acceptable in the target topology before substitution.
What is the thermal resistance profile of SMCJ75CH?
SMCJ75CH has a junction-to-ambient thermal resistance (RθJA) of 55°C/W and junction-to-case resistance (RθJC) of 10°C/W, as published in the THERMAL PERFORMANCE table. These values assume standard PCB layout per the suggested pad dimensions in the PACKAGE OUTLINE section and are critical for calculating safe operating area under repetitive surge conditions.
SMCJ75CH 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):
- 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:
- 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)
SMCJ75CH FAQ
1.How can I place an order for SMCJ75CH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ75CH 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 SMCJ75CH reliable?
The price and inventory of SMCJ75CH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ75CH is usually 5 days.
3.What payment methods are accepted for SMCJ75CH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ75CH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ75CH?
SMCJ75CH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ75CH 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 SMCJ75CH?
For technical support, including SMCJ75CH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ75CH requirements.
6.How does Aetrix verify that SMCJ75CH is sourced from the original manufacturer or authorized distributors?
All SMCJ75CH 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 SMCJ75CH meets industry standards.
7.What is the process for return or replacement of SMCJ75CH?
All SMCJ75CH units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ75CH, 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 SMCJ75CH part is unused and in its original packaging.
Return procedure for SMCJ75CH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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