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Taiwan Semiconductor Corporation SMAJ26
- Part No.:
- SMAJ26
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ26.pdf
- Description:
- 400W, 32.1V, 10%, UNIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:6,874
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Product details
Overview
SMAJ26 from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for primary-side overvoltage protection in DC power rails. It features a 26 V working stand-off voltage (VWM), 28.9–35.3 V breakdown voltage (VBR) at 1 mA test current, and clamps to ≤46.6 V at 8.6 A peak impulse current under 10/1000 µs waveform - enabling robust surge immunity in automotive and industrial DC/DC converters.
For engineers reviewing the SMAJ26 datasheet, SMAJ26 pinout, SMAJ26 application, or SMAJ26 equivalent, key selection criteria include its DO-214AC (SMA) package compatibility with automated placement, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, 400 W peak pulse power rating (10/1000 µs), and 1 µA max reverse leakage at VWM - critical for low-power standby integrity and high-reliability ESD/surge suppression.
Technical Context
The SMAJ26 operates as a unidirectional avalanche diode, leveraging glass-passivated junction technology for stable breakdown behavior and fast response (<1.0 ps from 0 V to VBR min). Its clamping action begins at VBR and sustains energy dissipation via thermal conduction through the DO-214AC case up to 150 °C junction temperature.
Designed for single-pulse transient suppression, it delivers 400 W peak pulse power at TA = 25 °C (derated linearly above ambient), supports 40 A non-repetitive forward surge (8.3 ms half-sine), and maintains <3.5 V forward voltage at 25 A - ensuring minimal conduction loss during fault conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 26 V - maximum continuous reverse operating voltage before leakage exceeds 1 µA; defines safe DC rail margin |
| VBR min/max | 28.9 V / 35.3 V at IT = 1 mA - guaranteed avalanche initiation range; ensures consistent turn-on across production lots |
| VC @ IPPM | ≤46.6 V at 8.6 A - clamped voltage during 10/1000 µs surge; determines protected circuit's maximum stress level |
| PPPM | 400 W (10/1000 µs) - peak transient energy handling capacity; validates compliance with ISO 7637-2 Pulse 3b |
| TJ max | +150 °C - maximum junction temperature; enables operation in under-hood automotive environments |
| Package | DO-214AC (SMA) - industry-standard surface-mount outline; compatible with IPC-7351B footprint and J-STD-002 solderability |
Pinout & Package
DO-214AC (SMA) package: molded epoxy case with matte tin-plated leads, polarity indicated by cathode band, weight ≈ 0.060 g, UL 94V-0 rated compound, JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side of protected line; carries full surge current during clamping |
| Cathode | Avalanche breakdown terminal | Marked with band; connected to higher-potential rail; defines unidirectional clamping direction |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity exposure |
| Fast response time <1.0 ps | Enables suppression of nanosecond-scale ESD transients before downstream ICs experience overstress |
| ISO 7637-2 compliance (Pulse 1/2a/2b/3a/3b) | Validates suitability for 12 V and 24 V automotive power networks against load dump and inductive switching events |
| Moisture sensitivity level 1 (J-STD-020) | Eliminates need for dry-packaging or baking prior to reflow; supports standard SMT assembly flow |
Applications
| Automotive Infotainment Power Rail | Industrial PLC I/O Module |
|---|---|
Use Scenario: Protecting 24 V supply input of head-unit MCU and display driver ICs against load-dump surges and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VIN and GND, upstream of DC/DC converter input filter. Use Value: Clamps transients to ≤46.6 V, preventing damage to 30 V-rated input capacitors and LDOs while maintaining <1 µA leakage in sleep mode. | Use Scenario: Safeguarding 24 V field power input of digital input modules exposed to inductive kickback from solenoids and relays. IC Role / Device Role / Timing Role: Primary surge clamp on backplane power bus, coordinated with secondary RC snubbers on individual channels. Use Value: Absorbs 400 W pulses per ISO 7637-2 Pulse 2b without degradation, preserving signal integrity and reducing false-trigger rates in optocoupled inputs. |
| LED Streetlight Driver Input | Telecom DC Power Distribution Unit |
Use Scenario: Overvoltage protection on AC/DC rectified output feeding constant-current LED driver ICs in outdoor lighting. IC Role / Device Role / Timing Role: Standoff-rated TVS across bulk capacitor terminals to suppress lightning-induced surges on long feeder lines. Use Value: Withstands repeated 10/1000 µs transients up to 8.6 A while maintaining VWM = 26 V - allowing use with 24 V nominal systems and 30% overvoltage margin. | Use Scenario: Front-end protection of -48 V DC distribution boards in central office equipment subject to hot-swap and cable discharge events. IC Role / Device Role / Timing Role: Unidirectional clamp referenced to system ground, placed immediately after input fuse and before bulk capacitance. Use Value: Delivers 46.6 V clamping at 8.6 A with <3.5 V forward drop at 25 A - minimizing voltage sag during high-current surge events and preserving brownout thresholds. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ26A | Narrower VBR range (28.9–31.9 V vs. 28.9–35.3 V); tighter 5% tolerance; same VWM, VC, and PPPM | Better suited for designs requiring tighter clamping consistency across temperature and lot variance | Select SMAJ26A when VBR stability is prioritized over cost; SMAJ26 offers broader margin for variable surge profiles |
| SMBJ26 | Same electrical specs but in DO-214AA (SMB) package - 2.5 mm wider body, 1.6 mm higher profile, 0.12 g weight | Requires PCB footprint revision; preferred where higher thermal mass or legacy SMB layout exists | Choose SMBJ26 only if existing board uses SMB pads or thermal derating demands larger case volume |
Compared with SMAJ26A and SMBJ26, the SMAJ26 provides optimal balance of cost, DO-214AC footprint compatibility, and 10% VBR tolerance - making it ideal for high-volume automotive and industrial power supply designs where moderate clamping variation is acceptable and space-constrained layouts prevail.
Availability
SMAJ26 is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLC I/O modules, and LED streetlight drivers requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMAJ26 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 SMAJ series is engineered specifically for high-energy transient suppression in automotive, industrial, and telecom power systems - emphasizing ISO 7637-2 compliance, automated assembly readiness, and extended temperature reliability.
FAQ
What is the maximum clamping voltage of SMAJ26 under standard 10/1000 µs surge conditions?
The SMAJ26 has a maximum clamping voltage (VC) of 46.6 V when subjected to its rated peak impulse current of 8.6 A using the standardized 10/1000 µs waveform. This value is measured at TJ = 25 °C and defines the upper voltage limit imposed on protected circuitry during transient events - critical for ensuring downstream components remain within their absolute maximum ratings.
Is SMAJ26 suitable for bidirectional transient protection?
No, SMAJ26 is a unidirectional TVS diode intended for protection of positive-polarity DC lines only. For bidirectional applications such as data lines or AC-coupled signals, the SMAJ26CA variant (with CA suffix) must be used. The SMAJ26 lacks symmetrical breakdown characteristics and will conduct heavily in reverse bias beyond its 26 V stand-off rating.
What is the reverse leakage current specification for SMAJ26 at its working stand-off voltage?
The SMAJ26 exhibits a maximum reverse leakage current (IR) of 1 µA when biased at its rated working stand-off voltage (VWM) of 26 V and measured at TA = 25 °C. This low leakage ensures minimal power loss in always-on systems and preserves battery life in standby modes - a key requirement for automotive body control modules and IoT edge nodes.
Does SMAJ26 meet automotive-grade reliability standards?
Yes, SMAJ26 meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements for 12 V and 24 V vehicle electrical systems. It is also qualified to JESD201 Class 2 for tin whisker resistance and J-STD-020 Moisture Sensitivity Level 1 - confirming suitability for lead-free reflow and under-hood deployment without preconditioning.
What is the thermal derating behavior of SMAJ26 above 25 °C ambient temperature?
SMAJ26's peak pulse power (PPPM) is linearly derated above TA = 25 °C per the manufacturer's Fig.2 curve, reaching approximately 200 W at 100 °C ambient. This derating ensures safe operation within its 150 °C maximum junction temperature limit and must be factored into thermal design when deployed in enclosed enclosures or near heat-generating components.
SMAJ26 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ26 FAQ
1.How can I place an order for SMAJ26 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ26 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 SMAJ26 reliable?
The price and inventory of SMAJ26 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ26 is usually 5 days.
3.What payment methods are accepted for SMAJ26?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ26 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ26?
SMAJ26 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ26 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 SMAJ26?
For technical support, including SMAJ26 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ26 requirements.
6.How does Aetrix verify that SMAJ26 is sourced from the original manufacturer or authorized distributors?
All SMAJ26 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 SMAJ26 meets industry standards.
7.What is the process for return or replacement of SMAJ26?
All SMAJ26 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ26, 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 SMAJ26 part is unused and in its original packaging.
Return procedure for SMAJ26:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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