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Taiwan Semiconductor Corporation SMCJ26CA
- Part No.:
- SMCJ26CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ26CA.pdf
- Description:
- TVS DIODE 26VWM 42.1VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:7,159
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Product details
Overview
SMCJ26CA from Taiwan Semiconductor is a bidirectional 1500W surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with 26V working stand-off voltage (VWM), 28.9–31.9V breakdown voltage (VBR), and 42.1V maximum clamping voltage (VC) at 37A peak pulse current - designed for automotive load-dump and inductive switching transient protection in power supply rails and CAN/LIN interfaces.
For engineers reviewing the SMCJ26CA datasheet, SMCJ26CA pinout, SMCJ26CA application, or SMCJ26CA equivalent, key selection criteria include bidirectional clamping capability, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, sub-1ps response time, <1µA reverse leakage above 10V, and thermal resistance (RθJA = 55°C/W) for high-reliability industrial and automotive PCB layouts.
Technical Context
The SMCJ26CA employs a glass-passivated silicon junction optimized for fast transient suppression without degradation under repetitive surge stress. Its bidirectional configuration enables symmetrical clamping in AC-coupled or floating signal lines, eliminating polarity concerns in differential bus protection.
It meets ISO 7637-2 test requirements for automotive electronics, including Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling noise), with guaranteed clamping performance up to 1500W peak pulse power at tp = 1ms.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 26 V - Maximum continuous reverse operating voltage before clamping initiates; sets safe margin below system rail voltage. |
| VBR min/max | 28.9 V / 31.9 V @ IT = 1 mA - Confirmed breakdown threshold range ensures reliable turn-on during transients. |
| VC @ IPPM | 42.1 V @ 37 A - Clamped voltage during 10/1000μs surge; defines worst-case overvoltage seen by protected IC. |
| PPK | 1500 W - Peak pulse power rating per 1ms waveform; supports high-energy automotive transients. |
| IR @ VWM | <1 µA - Ultra-low leakage preserves battery life and avoids false triggering in low-power systems. |
| RθJA | 55 °C/W - Junction-to-ambient thermal resistance; determines required PCB copper area for thermal management. |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, bidirectional, cathode band not applicable (no polarity marking required).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Identical terminals handle bidirectional surge current; no orientation dependency on PCB. |
| Case (body) | Thermal interface | DO-214AB body provides primary heat dissipation path to PCB copper pour. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR and low IR over temperature and lifetime; eliminates passivation-related drift in harsh environments. |
| ISO 7637-2 compliance | Validated for Pulse 1/2a/2b/3a/3b waveforms - directly qualifies for automotive ECU front-end protection without additional validation. |
| Sub-1ps response time | Clamps transients before sensitive logic or analog circuitry responds - critical for protecting high-speed CAN FD or LIN transceivers. |
| Moisture sensitivity level 1 | Zero bake requirement before reflow; compatible with standard SMT assembly processes without special handling. |
Applications
| Automotive Power Rail Protection | CAN/LIN Bus Transient Suppression |
|---|---|
Use Scenario: 12V/24V battery-fed ECUs exposed to load dump and alternator ripple. IC Role / Device Role: Primary TVS clamp on main power input to absorb >100V transients. Use Value: Limits voltage to ≤42.1V during 37A surges, preventing damage to downstream DC-DC converters and microcontrollers. | Use Scenario: High-speed vehicle communication buses subject to EFT and coupling noise. IC Role / Device Role: Bidirectional line protector across CAN_H/CAN_L or LIN bus lines. Use Value: Maintains signal integrity by clamping common-mode transients while adding <1pF junction capacitance. |
| Industrial PLC I/O Protection | LED Driver Surge Immunity |
Use Scenario: Digital/analog I/O modules connected to field wiring prone to lightning-induced surges. IC Role / Device Role: Input-side TVS on isolated or non-isolated sensor/actuator channels. Use Value: Withstands repeated 1500W pulses without parameter shift, supporting long-term field reliability. | Use Scenario: Constant-current LED drivers in street lighting exposed to grid switching transients. IC Role / Device Role: Output-stage clamp protecting MOSFETs and current-sense resistors. Use Value: Fast clamping prevents avalanche failure of output switches during inductive kickback events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ26CA (Bourns) | Same VWM/VBR/VC specs but 600W PPK rating; smaller SMB package (DO-214AA). | Limited to lower-energy transients; unsuitable for ISO 7637-2 Pulse 1 load dump. | Select only when board space is constrained and surge energy remains ≤600W. |
| P6SMB26CA (Littelfuse) | Identical 1500W rating and DO-214AB package; VBR min = 28.9V, VC = 42.1V - matches SMCJ26CA within tolerance. | No functional difference; validated for same automotive and industrial standards. | Drop-in alternative with identical footprint, thermal profile, and clamping behavior. |
Compared with SMBJ26CA and P6SMB26CA, the SMCJ26CA delivers full 1500W surge capacity in the industry-standard DO-214AB package, enabling robust protection where high-energy transients coexist with space-constrained layouts - unlike the lower-power SMBJ variant, and matching the P6SMB26CA's performance while offering Taiwan Semiconductor's extended lifecycle support.
Availability
SMCJ26CA is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLCs, LED driver modules, and CAN/LIN communication interfaces requiring stable component supply across multi-year production cycles.
Supply support for SMCJ26CA 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 semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs for automotive, industrial, and consumer markets.
The SMCJ series is part of TSC's high-reliability transient suppression portfolio, engineered specifically for ISO 7637-2-compliant automotive front-end protection and high-energy industrial surge immunity.
FAQ
What is the clamping voltage of SMCJ26CA at its rated peak pulse current?
The SMCJ26CA has a maximum clamping voltage (VC) of 42.1 V at 37 A peak pulse current (IPPM), measured under the 10/1000 μs standard surge waveform. This value ensures protected circuits experience no more than 42.1 V during worst-case transients, making SMCJ26CA suitable for 24V automotive systems where downstream ICs require strict overvoltage limits. The clamping performance is guaranteed across the full operating temperature range.
Is SMCJ26CA unidirectional or bidirectional, and how does that affect PCB layout?
SMCJ26CA is a bidirectional TVS diode, indicated by the "CA" suffix. It provides symmetrical clamping in both directions, eliminating polarity marking or orientation constraints during placement. Unlike unidirectional variants (e.g., SMCJ26A), the SMCJ26CA requires no cathode band alignment on the PCB - simplifying layout for differential buses like CAN or AC-coupled signal paths. This also avoids risk of incorrect installation in high-volume manufacturing.
Does SMCJ26CA meet automotive transient immunity standards such as ISO 7637-2?
Yes, SMCJ26CA is explicitly rated to meet ISO 7637-2 for Pulses 1, 2a, 2b, 3a, and 3b. Its 1500W peak pulse power rating, fast sub-1ps response, and controlled clamping voltage enable direct compliance in automotive ECU power rail and data line protection without external circuitry. Test reports and application notes from Taiwan Semiconductor confirm validation against these waveforms using standard 10/1000 μs and 5/50 ns profiles.
What is the thermal resistance and maximum junction temperature of SMCJ26CA?
The SMCJ26CA has a junction-to-ambient thermal resistance (RθJA) of 55 °C/W and a maximum junction temperature (TJ) of +150 °C. These values define its ability to dissipate surge energy without thermal runaway: at 25 °C ambient, it can sustain up to 5 W steady-state power, but its 1500W surge rating applies only for short-duration pulses (tp = 1 ms). Proper PCB copper pour design is essential to maintain RθJA near the specified value.
How does SMCJ26CA differ from SMCJ26A in terms of electrical behavior and use cases?
SMCJ26CA is bidirectional with symmetrical clamping in both polarities, while SMCJ26A is unidirectional and conducts only in reverse bias. This makes SMCJ26CA ideal for AC-coupled or floating lines (e.g., CAN differential pairs), whereas SMCJ26A suits DC rails with defined polarity. Their VBR (28.9–31.9 V), VWM (26 V), and VC (42.1 V) are identical, but SMCJ26A exhibits forward voltage (~3.5 V) under positive surge - a behavior absent in SMCJ26CA.
SMCJ26CA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AB, SMC
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 26V
- Voltage - Breakdown (Min):
- 28.9V
- Voltage - Clamping (Max) @ Ipp:
- 42.1V
- Current - Peak Pulse (10/1000µs):
- 35.6A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMCJ26CA FAQ
1.How can I place an order for SMCJ26CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ26CA 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 SMCJ26CA reliable?
The price and inventory of SMCJ26CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ26CA is usually 5 days.
3.What payment methods are accepted for SMCJ26CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ26CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ26CA?
SMCJ26CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ26CA 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 SMCJ26CA?
For technical support, including SMCJ26CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ26CA requirements.
6.How does Aetrix verify that SMCJ26CA is sourced from the original manufacturer or authorized distributors?
All SMCJ26CA 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 SMCJ26CA meets industry standards.
7.What is the process for return or replacement of SMCJ26CA?
All SMCJ26CA units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ26CA, 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 SMCJ26CA part is unused and in its original packaging.
Return procedure for SMCJ26CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ26CA Tags
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