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Taiwan Semiconductor Corporation SMAJ26AH
- Part No.:
- SMAJ26AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ26AH.pdf
- Description:
- TVS DIODE 26VWM 42.1VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,989
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Product details
Overview
SMAJ26AH from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, rated for 400W peak pulse power (10/1000μs), 26V working stand-off voltage (VWM), and 42.1V maximum clamping voltage (VC) at 9.5A peak impulse current - deployed for overvoltage protection in automotive DC/DC converters and industrial power supplies.
For engineers reviewing the SMAJ26AH datasheet, SMAJ26AH pinout, SMAJ26AH application, or SMAJ26AH equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, ISO 7637-2 compliance, clamping performance under standardized surge waveforms, and direct alternative part comparisons for robust ESD/surge design validation.
Technical Context
The SMAJ26AH operates as a unidirectional avalanche diode with glass-passivated junction, delivering sub-1ps response time from 0 V to breakdown (VBR = 28.9–31.9 V at IT = 1 mA). Its clamping action limits transient-induced voltage excursions to ≤42.1 V at 9.5 A (10/1000μs), while maintaining <1 μA reverse leakage at 26 V.
Designed for automotive-grade reliability, it meets AEC-Q101 stress testing requirements and ISO 7637-2 Pulse 1/2a/2b/3a/3b immunity standards. The device sustains 150°C maximum junction temperature and exhibits moisture sensitivity level 1 per J-STD-020.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 26 V - Maximum continuous reverse operating voltage before conduction begins; defines safe operating margin below clamping threshold. |
| VBR min/max | 28.9 V / 31.9 V at 1 mA - Confirmed breakdown range ensures predictable turn-on during transients without premature conduction. |
| VC @ IPPM | 42.1 V at 9.5 A (10/1000μs) - Measured clamping voltage protects downstream circuitry by limiting surge-induced voltage overshoot. |
| PPPM | 400 W (10/1000μs) - Peak pulse power rating validated for automotive load-dump and inductive switching events. |
| IR @ VWM | <1 μA - Ultra-low leakage preserves system efficiency and prevents false triggering in high-impedance bias networks. |
| TJ max | 150 °C - Enables reliable operation in under-hood automotive environments and thermally constrained PCB layouts. |
Pinout & Package
DO-214AC (SMA) surface-mount package with cathode band marking; matte tin-plated leads compliant with J-STD-002 solderability and JESD 201 Class 2 whisker resistance; weight ≈ 0.060 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during forward conduction | Connected to protected line (e.g., +12V rail); conducts only during fault conditions when VIN exceeds VBR. |
| Cathode | Current exit point during reverse-biased clamping | Connected to ground reference; enables low-impedance shunt path to divert surge energy away from sensitive ICs. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements including HTOL, TCT, and HAST - supports Tier-1 supply chain compliance. |
| Glass passivated junction | Enhances long-term reliability and stability of breakdown voltage under thermal cycling and humidity exposure. |
| ISO 7637-2 compliant | Withstands defined automotive transient pulses (Pulse 1: inductive load dump; Pulse 2a/2b: supply interruption; Pulse 3a/3b: capacitive coupling) without degradation. |
| Fast response time <1 ps | Ensures clamping activation before transient energy propagates into protected circuitry - critical for safeguarding fast-switching MOSFETs and microcontrollers. |
Applications
| Automotive DC/DC Converters | Industrial SMPS Inputs |
|---|---|
Use Scenario: Protection of 24V-to-5V buck converter inputs against load-dump transients in commercial vehicle electronics. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between input rail and chassis ground to clamp surges exceeding 26V. Use Value: Limits transient voltage to ≤42.1V at 9.5A, preventing damage to controller ICs and gate drivers during ISO 7637-2 Pulse 1 events. | Use Scenario: Input-stage surge suppression in DIN-rail mounted 48V industrial power supplies exposed to lightning-induced coupling. IC Role / Device Role / Timing Role: Primary overvoltage clamp on AC/DC rectified output bus prior to bulk capacitor and PFC stage. Use Value: Absorbs 400W peak pulse energy (10/1000μs), enabling compliance with IEC 61000-4-5 Level 4 immunity requirements. |
| LED Driver Modules | On-Board Battery Management Systems |
Use Scenario: Transient protection for constant-current LED driver ICs in outdoor signage subjected to ESD and cable discharge events. IC Role / Device Role / Timing Role: Parallel-connected TVS across driver supply pins to suppress fast-rising ESD pulses (IEC 61000-4-2). Use Value: Sub-1ps response ensures clamping initiates before driver IC internal structures experience overstress, preserving luminance consistency. | Use Scenario: Voltage rail protection in 12V battery monitoring circuits within EV auxiliary battery packs. IC Role / Device Role / Timing Role: Standoff-rated TVS on BMS analog front-end supply to prevent latch-up during jump-start transients. Use Value: 26V VWM provides 20% margin above nominal 12V battery, while 42.1V VC stays below absolute maximum ratings of precision ADCs and op-amps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ26H | Higher VBR (28.9–35.3 V) and higher VC (46.6 V at 8.6 A); same package and PPPM. | Less margin between VWM and VBR; less precise clamping for systems requiring tighter voltage control. | Select SMAJ26H only if higher clamping voltage is acceptable and lower leakage at VWM is not required. |
| SMBJ26AH | Same VWM, VBR, and VC specs but in larger DO-214AA (SMB) package; 600W PPPM. | Higher power handling and thermal mass; requires larger PCB footprint and different pad layout. | Choose SMBJ26AH when system-level surge energy exceeds 400W or board layout allows larger footprint for improved thermal derating. |
Compared with SMAJ26H and SMBJ26AH, the SMAJ26AH offers optimal balance of tight VBR tolerance (28.9–31.9 V), low clamping voltage (42.1 V), and compact DO-214AC packaging - making it preferred for space-constrained automotive modules where precise voltage limiting and AEC-Q101 compliance are mandatory.
Availability
SMAJ26AH is available at Aetrix Electronics and suitable for automotive DC/DC converters, industrial switch-mode power supplies, and LED driver modules requiring stable component supply with full traceability and lifecycle management.
Supply support for SMAJ26AH 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 with global distribution and automotive qualification capabilities.
The SMAJ series is designed specifically for high-reliability transient suppression in harsh environments - emphasizing AEC-Q101 compliance, ISO 7637-2 immunity, and stable clamping performance across temperature and lifetime.
FAQ
What is the breakdown voltage range for SMAJ26AH?
The SMAJ26AH has a guaranteed breakdown voltage (VBR) range of 28.9 V to 31.9 V at a test current of 1 mA, measured per JEDEC standards. This narrow VBR window ensures consistent turn-on behavior across production lots and supports precise overvoltage protection design margins in the SMAJ26AH application.
Is SMAJ26AH suitable for bidirectional transient protection?
No, SMAJ26AH is a unidirectional TVS diode intended for protection of DC rails with defined polarity. For bidirectional applications such as AC lines or data buses, use the SMAJ26ACH variant (with CH suffix) - the SMAJ26AH itself lacks symmetrical clamping characteristics and must be oriented with cathode toward the protected line's ground reference.
Does SMAJ26AH meet automotive qualification standards?
Yes, SMAJ26AH is AEC-Q101 qualified and tested for temperature cycling, high-temperature operating life, and humidity exposure. It also meets ISO 7637-2 Pulse 1/2a/2b/3a/3b requirements, confirming its suitability for automotive power electronics including body control modules and infotainment power supplies using SMAJ26AH.
What is the maximum clamping voltage of SMAJ26AH under surge conditions?
The SMAJ26AH clamps to a maximum of 42.1 V when subjected to a 9.5 A peak impulse current with a 10/1000μs waveform - a value confirmed in the official Taiwan Semiconductor datasheet. This clamping voltage directly determines the maximum stress imposed on downstream components during surge events involving SMAJ26AH.
Can SMAJ26AH replace SMAJ26H in an existing design?
SMAJ26AH can replace SMAJ26H only if tighter VBR control and lower clamping voltage are beneficial - SMAJ26AH offers 28.9–31.9 V VBR vs. 28.9–35.3 V for SMAJ26H, and clamps at 42.1 V vs. 46.6 V. No PCB changes are needed since both share DO-214AC (SMA) packaging, but verify system-level margin against the lower VC of SMAJ26AH.
SMAJ26AH 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:
- 42.1V
- Current - Peak Pulse (10/1000µs):
- 9.5A
- 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)
SMAJ26AH FAQ
1.How can I place an order for SMAJ26AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ26AH 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 SMAJ26AH reliable?
The price and inventory of SMAJ26AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ26AH is usually 5 days.
3.What payment methods are accepted for SMAJ26AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ26AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ26AH?
SMAJ26AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ26AH 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 SMAJ26AH?
For technical support, including SMAJ26AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ26AH requirements.
6.How does Aetrix verify that SMAJ26AH is sourced from the original manufacturer or authorized distributors?
All SMAJ26AH 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 SMAJ26AH meets industry standards.
7.What is the process for return or replacement of SMAJ26AH?
All SMAJ26AH units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ26AH, 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 SMAJ26AH part is unused and in its original packaging.
Return procedure for SMAJ26AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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