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Taiwan Semiconductor Corporation SMAJ26H
- Part No.:
- SMAJ26H
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ26H.pdf
- Description:
- TVS DIODE 26VWM 46.6VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,410
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Product details
Overview
SMAJ26H from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for robust overvoltage protection in DC power rails and signal lines. It features a 26 V working stand-off voltage (VWM), 28.9–35.3 V breakdown voltage (VBR), 46.6 V maximum clamping voltage (VC) at 8.6 A peak pulse current, and 400 W peak pulse power rating per 10/1000 µs waveform - deployed in automotive-grade SMPS, on-board DC/DC converters, and lighting drivers.
For engineers reviewing the SMAJ26H datasheet, SMAJ26H pinout, SMAJ26H application, or SMAJ26H equivalent, key selection criteria include its AEC-Q101 qualification, DO-214AC (SMA) package compatibility, bidirectional variant availability (SMAJ26AH), and ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance for automotive transients.
Technical Context
The SMAJ26H operates as a unidirectional avalanche diode with glass-passivated junction, delivering sub-1 ps response time from 0 V to VBR(min). Its clamping behavior is defined by a 10/1000 µs double-exponential surge waveform, with peak impulse current (IPPM) rated at 8.6 A and steady-state power dissipation limited to 1 W.
Thermal performance is specified across -55 °C to +150 °C operating junction temperature range, with derating applied above 25 °C ambient per Fig.2. Reverse leakage current remains ≤1 µA at 26 V (VWM), ensuring minimal standby power loss in protected circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 26 V - Maximum continuous reverse operating voltage before conduction begins |
| VBR @ IT=1 mA | 28.9–35.3 V - Breakdown voltage range defining reliable avalanche onset under test conditions |
| VC @ IPPM=8.6 A | 46.6 V - Clamped voltage during 10/1000 µs surge, limiting downstream component stress |
| PPPM | 400 W - Peak pulse power handling capability, enabling protection against high-energy transients |
| IR @ VWM | ≤1 µA - Ultra-low reverse leakage ensures negligible quiescent current in standby operation |
| TJ Range | -55 °C to +150 °C - Full automotive-grade thermal envelope supporting under-hood and engine-control applications |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, single-diode configuration with cathode band marking. Matte tin-plated leads meet J-STD-002 solderability requirements; moisture sensitivity level is J-STD-020 Level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Surge return path | Connected to lower-potential side of protected line (e.g., GND or return rail) |
| Cathode | Reverse-biased terminal / Clamping node | Connected to protected line (e.g., 24 V supply); conducts when Vin exceeds VWM |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics use including engine control, body modules, and ADAS power supplies |
| Glass passivated junction | Enhances long-term reliability and stability under thermal cycling and humidity exposure |
| Fast response time <1 ps | Enables suppression of ESD and fast-rising transients before sensitive ICs experience overstress |
| ISO 7637-2 compliance | Meets Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line impedance coupling) |
Applications
| Automotive Power Supply Protection | Industrial DC/DC Converter Input |
|---|---|
Use Scenario: Protecting 24 V battery-fed ECUs against load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between 24 V rail and chassis ground to clamp surges up to ±100 V. Use Value: Limits clamped voltage to 46.6 V, safeguarding downstream regulators and microcontrollers rated for ≤48 V absolute max. | Use Scenario: Input-side surge suppression in isolated 48 V-to-12 V industrial DC/DC modules. IC Role / Device Role / Timing Role: Standoff-rated TVS absorbing repetitive switching noise and lightning-induced surges on primary side. Use Value: With 1 µA leakage at 26 V, it avoids loading the upstream source while maintaining fast (<1 ps) turn-on for transient events. |
| LED Driver Overvoltage Clamp | Smart Lighting Control Interface |
Use Scenario: Safeguarding constant-current LED driver ICs from inductive kickback during dimming FET switching. IC Role / Device Role / Timing Role: Parallel-connected unidirectional TVS referenced to driver output, clamping flyback spikes. Use Value: 400 W peak power rating handles short-duration energy bursts without degradation, preserving driver lifetime. | Use Scenario: Protecting DALI or 0–10 V analog control inputs in commercial lighting systems. IC Role / Device Role / Timing Role: Low-capacitance TVS on low-voltage signal line, grounded via series resistor to limit current. Use Value: Sub-1 ps response ensures clamping occurs before control IC input structures are damaged by ESD or cable discharge 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 |
|---|---|---|---|
| SMAJ26AH | Narrower VBR range (28.9–31.9 V) and lower VC (42.1 V), same package and VWM | Better clamping margin for 24 V systems with tight downstream voltage tolerances | Select SMAJ26AH when tighter clamping voltage and reduced VBR spread improve system-level surge margin. |
| SMBJ26A | DO-214AA (SMB) package, 600 W PPPM, identical VWM/VBR/VC specs but higher surge rating | Requires PCB layout change due to larger footprint; suited for higher-energy environments | Choose SMBJ26A only if 600 W surge capacity is required and board space allows DO-214AA placement. |
Compared with SMAJ26AH and SMBJ26A, the SMAJ26H offers balanced clamping performance and AEC-Q101 reliability in the compact DO-214AC footprint - optimal for space-constrained 24 V automotive and industrial power nodes where 400 W surge immunity suffices.
Availability
SMAJ26H is available at Aetrix Electronics and suitable for automotive power supply protection, industrial DC/DC converter input stages, and LED driver overvoltage clamp circuits requiring stable component supply and full AEC-Q101 traceability.
Supply support for SMAJ26H 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 SMAJ series is engineered specifically for high-reliability transient suppression in harsh environments - emphasizing AEC-Q101 qualification, ISO 7637-2 compliance, and robust glass-passivated junction construction.
FAQ
What is the clamping voltage of SMAJ26H at its rated peak pulse current?
The SMAJ26H has a maximum clamping voltage (VC) of 46.6 V when subjected to its rated peak pulse current of 8.6 A under the standard 10/1000 µs waveform. This value is measured per JEDEC test conditions and defines the upper voltage limit imposed on protected circuitry during surge events. The SMAJ26H maintains this clamping performance across its full operating temperature range.
Is SMAJ26H suitable for automotive applications?
Yes, SMAJ26H is AEC-Q101 qualified and meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b test requirements - making it suitable for automotive power line protection in engine control units, body electronics, and lighting modules. Its -55 °C to +150 °C operating junction temperature range and glass-passivated junction further support under-hood deployment. SMAJ26H is explicitly listed in TSC's automotive-grade TVS portfolio.
What is the difference between SMAJ26H and SMAJ26AH?
SMAJ26H and SMAJ26AH share identical VWM (26 V), package (DO-214AC), and AEC-Q101 qualification, but differ in breakdown voltage tolerance: SMAJ26H has VBR = 28.9–35.3 V, while SMAJ26AH narrows this to 28.9–31.9 V. Consequently, SMAJ26AH achieves a lower maximum clamping voltage of 42.1 V vs. 46.6 V for SMAJ26H - offering tighter overvoltage control for sensitive 24 V systems.
Does SMAJ26H have polarity marking, and how is it identified?
Yes, SMAJ26H is unidirectional and features a cathode band marking on the DO-214AC (SMA) package body. The band denotes the cathode terminal, which must be connected to the line being protected (e.g., 24 V rail), while the anode connects to ground or return. This polarity is critical for proper clamping function; reverse connection renders the device ineffective for overvoltage suppression.
What is the peak pulse power rating of SMAJ26H and under what test condition?
The SMAJ26H has a peak pulse power rating (PPPM) of 400 W, tested using the standardized 10/1000 µs double-exponential current waveform per R.E.A. definition. This rating applies at TA = 25 °C and is derated linearly above that ambient temperature per the manufacturer's pulse derating curve (Fig.2). At voltages above 78 V, the rating reduces to 300 W - not applicable to SMAJ26H.
SMAJ26H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AC, SMA
- Series:
- SMAJ
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 26V
- Voltage - Breakdown (Min):
- 28.9V
- Voltage - Clamping (Max) @ Ipp:
- 46.6V
- Current - Peak Pulse (10/1000µs):
- 8.6A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ26H FAQ
1.How can I place an order for SMAJ26H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ26H 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 SMAJ26H reliable?
The price and inventory of SMAJ26H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ26H is usually 5 days.
3.What payment methods are accepted for SMAJ26H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ26H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ26H?
SMAJ26H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ26H 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 SMAJ26H?
For technical support, including SMAJ26H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ26H requirements.
6.How does Aetrix verify that SMAJ26H is sourced from the original manufacturer or authorized distributors?
All SMAJ26H 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 SMAJ26H meets industry standards.
7.What is the process for return or replacement of SMAJ26H?
All SMAJ26H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ26H, 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 SMAJ26H part is unused and in its original packaging.
Return procedure for SMAJ26H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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