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Taiwan Semiconductor Corporation SMCJ45CAH
- Part No.:
- SMCJ45CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ45CAH.pdf
- Description:
- TVS DIODE 45VWM 72.7VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,358
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Product details
Overview
SMCJ45CAH from Taiwan Semiconductor is a bidirectional 45V stand-off, 1500W surface-mount transient voltage suppressor (TVS) in DO-214AB (SMC) package, with 72.7V clamping voltage at 21A peak pulse current and <1μA reverse leakage at 45V, designed for automotive-grade ESD and surge protection in power supply rails and data lines.
For engineers reviewing the SMCJ45CAH datasheet, SMCJ45CAH pinout, SMCJ45CAH application, or SMCJ45CAH equivalent, key selection criteria include bidirectional clamping performance, AEC-Q101 qualification, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, fast sub-1ps response time, and thermal resistance of 10°C/W junction-to-case.
Technical Context
The SMCJ45CAH implements a glass-passivated silicon avalanche junction optimized for high-energy transient suppression. It delivers symmetrical breakdown behavior (50V min / 55.3V max at 1mA test current) in both directions, enabling robust protection without polarity sensitivity in DC bus or AC-coupled signal paths.
Its thermal design supports continuous operation up to +150°C junction temperature, with RθJC = 10°C/W and RθJA = 55°C/W, allowing effective heat dissipation in compact PCB layouts. The device meets JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 50.0 / 55.3 V @ 1 mA - Confirmed bidirectional breakdown range ensures predictable turn-on across production lot |
| VC @ IPPM | 72.7 V @ 21 A - Clamping voltage limits downstream component stress during 10/1000µs transients |
| PPK | 1500 W - Peak pulse power rating defines maximum single-event surge energy absorption capability |
| IR @ VWM | <1 µA - Ultra-low leakage preserves battery life and avoids false triggering in low-power systems |
| TJ max | +150 °C - Enables reliable operation in under-hood automotive environments and industrial enclosures |
| Response time | <1.0 ps - Sub-picosecond junction response ensures protection before transient energy couples into ICs |
Pinout & Package
DO-214AB (SMC) surface-mount package: 2-terminal, non-polarized bidirectional configuration; cathode band not applicable; matte tin-plated leads compliant with J-STD-002 solderability; UL 94V-0 molding compound; 0.210 g typical weight.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional avalanche junction terminal | No polarity marking required; either terminal serves as input/output for transient energy diversion |
| Case (exposed metal pad) | Thermal conduction path | Integral copper lead frame provides low-impedance heat transfer to PCB copper pour or thermal pad |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements including HTOL, TCT, 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 |
| Glass passivated junction | Enhances long-term reliability and stability of breakdown voltage under thermal cycling and humidity exposure |
| Fast response time <1 ps | Prevents overshoot beyond clamping threshold during nanosecond-scale ESD events (IEC 61000-4-2) |
| Halogen-free & RoHS | Complies with IEC 61249-2-21 and EU Directive 2011/65/EU for environmentally constrained applications |
Applications
| Automotive Power Rail Protection | Industrial CAN Bus Interface |
|---|---|
Use Scenario: Protecting 12V/24V battery-fed ECUs against load dump and alternator transients. IC Role / Device Role / Timing Role: Bidirectional TVS placed at power entry point to clamp surges before reaching LDOs, microcontrollers, and CAN transceivers. Use Value: 72.7V clamping prevents damage to 36V-rated components while maintaining AEC-Q101 qualification for under-hood deployment. | Use Scenario: Shielding CAN_H/CAN_L differential pair from ESD and coupled transients in factory automation nodes. IC Role / Device Role / Timing Role: Common-mode TVS connected between CAN_H–CAN_L and chassis ground to suppress asymmetric surges without disrupting signal integrity. Use Value: Symmetrical 50–55.3V breakdown ensures equal clamping on both lines, preserving common-mode rejection and meeting ISO 11898-2 immunity targets. |
| Telecom DC Power Input | Consumer USB-C Port Protection |
Use Scenario: Safeguarding PoE-powered switches and base stations from lightning-induced surges on 48V DC inputs. IC Role / Device Role / Timing Role: Primary-level TVS mounted directly at connector to shunt >1kW transients before upstream DC/DC converters. Use Value: 1500W peak power rating handles worst-case 10/1000µs surges defined in IEC 61000-4-5 Level 4, reducing need for cascaded protection stages. | Use Scenario: Adding secondary-level surge defense behind integrated USB-C port protectors in laptops and docking stations. IC Role / Device Role / Timing Role: Standby TVS across VBUS and GND to absorb residual transients that bypass front-end polymer PTCs and diode arrays. Use Value: 45V working voltage aligns with USB PD 3.0 48V max, while 72.7V clamping stays below 80V absolute maximum ratings of USB-C controller ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ45CA | 600W peak power, SMB package (smaller footprint, higher RθJA = 85°C/W) | Limited to lower-energy transients; unsuitable for ISO 7637-2 Pulse 1 or load dump | Select when space-constrained and surge threat level is limited to IEC 61000-4-2/4-4 only |
| TPSMD45CA | 1500W rating, same DO-214AB package, but no AEC-Q101 qualification or ISO 7637-2 validation | Not certified for automotive use; requires additional system-level testing for vehicle integration | Select for cost-sensitive industrial designs where automotive qualification is unnecessary |
Compared with SMBJ45CA and TPSMD45CA, the SMCJ45CAH uniquely combines 1500W surge capacity, AEC-Q101 qualification, and full ISO 7637-2 compliance in a standard SMC package-making it the only drop-in solution for automotive power rail protection without derating or layout changes.
Availability
SMCJ45CAH is available at Aetrix Electronics and suitable for automotive electronics, industrial CAN networks, telecom power supplies, and consumer USB-C systems requiring stable component supply and long-term lifecycle support.
Supply support for SMCJ45CAH 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 was developed specifically for high-reliability transient suppression in automotive and industrial environments, emphasizing AEC-Q101 compliance, ISO 7637-2 immunity, and robust thermal performance in surface-mount packages.
FAQ
What does the "CAH" suffix indicate in SMCJ45CAH?
The "CAH" suffix in SMCJ45CAH denotes a bidirectional configuration (C), AEC-Q101 qualification (A), and high-reliability construction (H). Unlike unidirectional variants (e.g., SMCJ45H), the CAH version provides symmetrical clamping in both polarities-critical for protecting AC-coupled signals or floating DC buses where polarity cannot be guaranteed. This is confirmed in the datasheet's "Devices for bipolar applications" section.
Does SMCJ45CAH meet ISO 7637-2 Pulse 1 requirements?
Yes, SMCJ45CAH is explicitly validated to meet ISO 7637-2 Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (ignition noise) waveforms. Its 1500W peak power rating and 72.7V clamping voltage ensure compliance with the 12V system test levels defined in the standard, as stated in the FEATURES section of the official datasheet.
What is the maximum clamping voltage of SMCJ45CAH at rated peak current?
The maximum clamping voltage of SMCJ45CAH is 72.7 V at 21 A peak pulse current (IPPM) under the standardized 10/1000 µs waveform. This value is measured per Note 2 in the Electrical Specifications table and represents the upper limit of voltage seen by protected circuitry during worst-case surge events.
Is SMCJ45CAH compatible with lead-free reflow soldering processes?
Yes, SMCJ45CAH supports lead-free reflow soldering per J-STD-020. Its matte tin-plated leads are fully solderable under standard Pb-free profiles (peak temperature ≤260°C), and its moisture sensitivity level is rated J-STD-020 Level 1-meaning it can be stored indefinitely at ambient conditions without baking prior to assembly.
How does SMCJ45CAH differ from SMCJ45AH?
SMCJ45CAH is bidirectional (CA), whereas SMCJ45AH is unidirectional (A). The "C" suffix enables symmetrical breakdown and clamping in both directions, eliminating polarity concerns in AC or floating DC applications. Electrically, SMCJ45CAH has identical VWM (45 V), VBR (50–55.3 V), and VC (72.7 V) specs-but applies them equally across terminals, unlike SMCJ45AH which requires correct anode/cathode orientation.
SMCJ45CAH 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):
- 45V
- Voltage - Breakdown (Min):
- 50V
- Voltage - Clamping (Max) @ Ipp:
- 72.7V
- Current - Peak Pulse (10/1000µs):
- 21A
- 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)
SMCJ45CAH FAQ
1.How can I place an order for SMCJ45CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ45CAH 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 SMCJ45CAH reliable?
The price and inventory of SMCJ45CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ45CAH is usually 5 days.
3.What payment methods are accepted for SMCJ45CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ45CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ45CAH?
SMCJ45CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ45CAH 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 SMCJ45CAH?
For technical support, including SMCJ45CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ45CAH requirements.
6.How does Aetrix verify that SMCJ45CAH is sourced from the original manufacturer or authorized distributors?
All SMCJ45CAH 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 SMCJ45CAH meets industry standards.
7.What is the process for return or replacement of SMCJ45CAH?
All SMCJ45CAH units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ45CAH, 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 SMCJ45CAH part is unused and in its original packaging.
Return procedure for SMCJ45CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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