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Taiwan Semiconductor Corporation SMDJ26CAH
- Part No.:
- SMDJ26CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMDJ26CAH.pdf
- Description:
- TVS DIODE 26VWM 42.1VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
SMDJ26CAH from Taiwan Semiconductor is a bidirectional 3000W 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 71.3A peak pulse current - designed for automotive-grade ESD and load-dump protection in power supply rails and data lines.
For engineers reviewing the SMDJ26CAH datasheet, SMDJ26CAH pinout, SMDJ26CAH application, or SMDJ26CAH equivalent, key selection criteria include bidirectional clamping performance, AEC-Q101 qualification, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, sub-1ps response time, and DO-214AB thermal resistance (RθJA = 75°C/W).
Technical Context
The SMDJ26CAH is a glass-passivated, single-die, bidirectional TVS diode optimized for high-energy transient suppression in harsh environments. It delivers 3000W peak pulse power (10/1000µs waveform), clamps transients within 42.1V at 71.3A, and operates across –55°C to +175°C junction temperature range.
Its design supports fast response (<1.0ps), low leakage (<1µA @ 26V), and robust reliability per JESD201 Class 2 whisker test and J-STD-020 Moisture Sensitivity Level 1 - making it suitable for automotive infotainment, body control modules, and industrial PLC I/O protection where ISO 7637-2 compliance is mandatory.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 26 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 28.9 V / 31.9 V - Breakdown occurs within this range at 1 mA test current, defining turn-on threshold |
| VC @ IPPM | 42.1 V - Clamped voltage seen by protected circuit during 71.3 A 10/1000µs surge |
| PPK | 3000 W - Peak transient energy absorption capability under standardized 1ms pulse |
| TJ max | +175 °C - Enables operation in under-hood automotive environments without derating |
| RθJA | 75 °C/W - Thermal resistance from junction to ambient, critical for PCB layout heat dissipation planning |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, bidirectional configuration with cathode band omitted (symmetrical terminals). Molding compound meets UL 94V-0; matte tin-plated leads, solderable per J-STD-002.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional transient path | No polarity marking required; identical clamping behavior in both directions |
| Case (body) | Thermal conduction path | DO-214AB metalized slug provides primary heat transfer to PCB copper pour |
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 compliant | Withstands Pulse 1 (inductive load dump), Pulse 2a/2b (battery disconnect), and Pulse 3a/3b (switching transients) |
| Sub-1ps response time | Ensures clamping activation before sensitive downstream ICs experience overvoltage damage |
| Moisture Sensitivity Level 1 | Zero bake requirement prior to reflow; compatible with standard SMT assembly processes |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Card |
|---|---|
Use Scenario: Protecting microcontroller GPIOs and CAN transceiver power rails from load-dump spikes during battery switching. IC Role / Device Role / Timing Role: Bidirectional clamping device placed directly at connector entry point to shunt transients before reaching LDOs or logic ICs. Use Value: Limits voltage excursion to ≤42.1V during 71.3A ISO 7637-2 Pulse 2b event, preventing latch-up or permanent damage to 3.3V/5V logic. | Use Scenario: Safeguarding 24V DC digital input channels against field-wiring induced surges and relay coil flyback. IC Role / Device Role / Timing Role: Primary front-end transient suppressor on each channel's input node, upstream of optocoupler or Schmitt trigger. Use Value: Absorbs up to 3000W transient energy while maintaining <1µA leakage at 26V, ensuring stable high-impedance sensing during normal operation. |
| Telecom Power Supply Front-End | Consumer Appliance Motor Drive Board |
Use Scenario: Guarding AC/DC adapter secondary-side 24V output rail against lightning-induced surges entering via Ethernet or PoE lines. IC Role / Device Role / Timing Role: Secondary-side TVS placed after bulk capacitor but before DC-DC converter input, providing final-stage overvoltage defense. Use Value: Clamps 10/1000µs transients to 42.1V with <1.0ps response, preserving downstream regulator integrity without sacrificing efficiency. | Use Scenario: Suppressing commutation spikes from brushed DC motors in washing machine control boards. IC Role / Device Role / Timing Role: Parallel-connected TVS across motor terminals to clamp inductive kickback during PWM switching. Use Value: Handles repetitive 3000W pulses with RθJA = 75°C/W, enabling reliable operation without heatsink in compact sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC26CA | Lower PPK (1500W), same VWM/VBR/VC, DO-214AC (SMA) package | Reduced surge margin; suited for non-automotive, lower-risk environments | Select when cost sensitivity outweighs need for 3000W rating and AEC-Q101 validation |
| SMCJ26CA | Identical electrical specs and DO-214AB package; manufactured by Vishay, not AEC-Q101 qualified | Lacks automotive qualification; acceptable for industrial/commercial use only | Choose if supply chain diversification is prioritized and AEC-Q101 is not mandated |
Compared with SAC26CA and SMCJ26CA, the SMDJ26CAH uniquely combines 3000W surge capability, AEC-Q101 qualification, and ISO 7637-2 compliance - making it the only option among the three validated for under-hood automotive deployment without derating or additional system-level protection.
Availability
SMDJ26CAH is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC I/O protection, telecom power supply front-ends, and consumer appliance motor drive boards requiring stable component supply and full AEC-Q101 traceability.
Supply support for SMDJ26CAH 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 SMDJ series was developed specifically for automotive and industrial transient suppression, emphasizing AEC-Q101 reliability, high-power clamping, and compatibility with automated SMT assembly - targeting systems exposed to ISO 7637-2 and IEC 61000-4-5 threats.
FAQ
What does the "CAH" suffix indicate in SMDJ26CAH?
The "CAH" suffix in SMDJ26CAH denotes a bidirectional configuration - meaning the device provides symmetrical clamping in both forward and reverse directions, with no cathode marking required. This distinguishes it from unidirectional variants (e.g., SMDJ26AH) that feature polarity-sensitive clamping and a visible cathode band. The SMDJ26CAH is fully specified for bidirectional operation per its VBR min/max and VC values in both polarities.
Is SMDJ26CAH qualified for automotive applications?
Yes, SMDJ26CAH is AEC-Q101 qualified and explicitly tested to meet ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b transient immunity standards. Its construction - including glass-passivated junction, JESD201 Class 2 whisker resistance, and MSL Level 1 rating - ensures reliability in automotive under-hood and cabin environments. Full qualification documentation is available from Taiwan Semiconductor upon request.
What is the maximum clamping voltage of SMDJ26CAH and at what current?
The maximum clamping voltage (VC) of SMDJ26CAH is 42.1 V, measured at a peak pulse current (IPPM) of 71.3 A under the standardized 10/1000 µs waveform. This value is guaranteed across the full operating temperature range (–55°C to +175°C) and defines the upper voltage limit imposed on protected circuits during worst-case surge events.
Can SMDJ26CAH be used in place of a unidirectional TVS like SMDJ26AH?
No - SMDJ26CAH is bidirectional and lacks polarity marking, while SMDJ26AH is unidirectional with a defined cathode band and different forward voltage behavior. Substituting SMDJ26CAH for SMDJ26AH may compromise protection in DC-biased circuits where asymmetry matters. Use SMDJ26CAH only where true bidirectional clamping is required, such as AC-coupled signal lines or floating power rails.
What is the thermal resistance and how does it affect PCB layout for SMDJ26CAH?
SMDJ26CAH has a junction-to-ambient thermal resistance (RθJA) of 75°C/W. To maintain safe operation during repetitive surges, the PCB must provide adequate copper area - typically ≥100 mm² of 2 oz copper connected to both terminals - to dissipate heat. Insufficient copper will cause junction temperature to exceed 175°C, triggering thermal runaway and permanent failure.
SMDJ26CAH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AB, SMC
- Series:
- SMDJ
- 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):
- 71.3A
- Power - Peak Pulse:
- 3000W (3kW)
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMDJ26CAH FAQ
1.How can I place an order for SMDJ26CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMDJ26CAH 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 SMDJ26CAH reliable?
The price and inventory of SMDJ26CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDJ26CAH is usually 5 days.
3.What payment methods are accepted for SMDJ26CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDJ26CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMDJ26CAH?
SMDJ26CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMDJ26CAH 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 SMDJ26CAH?
For technical support, including SMDJ26CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDJ26CAH requirements.
6.How does Aetrix verify that SMDJ26CAH is sourced from the original manufacturer or authorized distributors?
All SMDJ26CAH 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 SMDJ26CAH meets industry standards.
7.What is the process for return or replacement of SMDJ26CAH?
All SMDJ26CAH units undergo pre-shipment inspection (PSI). If there is an issue with SMDJ26CAH, 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 SMDJ26CAH part is unused and in its original packaging.
Return procedure for SMDJ26CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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