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Diodes Incorporated SMAJ26A-13
- Part No.:
- SMAJ26A-13
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ26A-13.pdf
- Description:
- TVS DIODE 26VWM 42.1VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:3,280
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Product details
Overview
SMAJ26A-13 from Diodes Incorporated is a unidirectional 400W surface-mount transient voltage suppressor (TVS) diode designed for primary overvoltage protection in DC power rails and signal lines. It features a 26V reverse standoff voltage (VRWM), 28.9–31.9V breakdown voltage (VBR) at 1mA, 42.1V maximum clamping voltage (VC) at 9.5A peak pulse current (IPP), and operates from –55°C to +150°C junction temperature.
For engineers reviewing the SMAJ26A-13 datasheet, SMAJ26A-13 pinout, SMAJ26A-13 application, or SMAJ26A-13 equivalent, key selection criteria include clamping performance under 8.3ms surge waveforms, unidirectional polarity for DC-biased circuits, RoHS-compliant SMA package compatibility with automated SMT assembly, and thermal derating behavior above 25°C ambient.
Technical Context
The SMAJ26A-13 uses a glass-passivated silicon junction optimized for fast response (<1ps) to transient events such as ESD, lightning-induced surges, and inductive switching spikes. Its unidirectional configuration provides low-leakage reverse blocking (≤5μA @ 26V) while enabling robust forward conduction during clamping.
It complies with IEC 61000-4-2 (ESD), IEC 61000-4-4 (EFT), and IEC 61000-4-5 (surge) immunity standards when properly laid out with minimal trace inductance. The device is rated for 400W non-repetitive peak pulse power (8.3ms half-sine) and derates linearly above 25°C ambient per Fig. 1 of DS19005 Rev. 12.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400W - sustains single 8.3ms surge without failure; defines maximum energy absorption capability |
| Reverse Standoff Voltage (VRWM) | 26V - maximum continuous DC voltage before significant leakage; sets operating rail margin |
| Breakdown Voltage (VBR) | 28.9–31.9V @ 1mA - onset of avalanche conduction; ensures reliable turn-on before system damage |
| Clamping Voltage (VC) | 42.1V @ 9.5A IPP - maximum voltage seen by protected circuit during worst-case surge |
| Junction Temperature Range | –55°C to +150°C - supports operation in automotive engine compartments and industrial enclosures |
| Package | SMA (DO-214AC) - industry-standard surface-mount outline with 2.29–2.92mm height and 4.00–4.60mm width |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with UL 94V-0 flammability rating, cathode band marking, and lead-free matte tin plating. Weight: 0.064g. Moisture sensitivity level: MSL 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry during forward surge conduction | Connected to protected line (e.g., VBUS); conducts during overvoltage clamp |
| Cathode | Current exit during forward surge conduction | Connected to ground or lower-potential reference; marked with band on body |
Key Features
| Feature | Design Value |
|---|---|
| 400W Peak Pulse Power | Enables protection against high-energy transients (e.g., ISO 7637-2 Pulse 5a) without derating penalties in compact layouts |
| Glass-Passivated Die | Improves long-term reliability and stability of VBR and leakage under thermal cycling and humidity stress |
| Fast Response Time | <1 ps - limits voltage overshoot before clamping engages, critical for protecting sensitive IC inputs |
| RoHS-Compliant & Lead-Free | Meets EU Directive 2011/65/EU with exemptions applied; compatible with Pb-free reflow profiles (J-STD-020C) |
Applications
| Automotive Power Rail Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: 12V battery-fed ECUs exposed to load dump (ISO 16750-2) and alternator ripple. IC Role / Device Role / Timing Role: Primary clamping element placed between VBAT and ground, upstream of DC-DC converters. Use Value: Limits transient voltage to ≤42.1V, preventing damage to 36V-rated regulators and microcontrollers. | Use Scenario: 24V digital input modules subject to field-wiring induced surges and ESD contact discharge. IC Role / Device Role / Timing Role: Input-side TVS on dry-contact or PNP/NPN sensor interface lines. Use Value: Clamps fast-rising transients (<1ns rise time) before they propagate into isolation barriers or logic-level translators. |
| USB Type-C VBUS Protection | Telecom Line Card Surge Suppression |
Use Scenario: VBUS line in USB PD 3.0 designs where up to 20V is present during negotiation. IC Role / Device Role / Timing Role: Secondary overvoltage clamp after primary fuse and common-mode choke. Use Value: Provides 26V standoff with 42.1V clamping-compatible with 5V/9V/15V/20V PD profiles while avoiding false triggering. | Use Scenario: TIP/RING lines in VoIP gateways connected to PSTN infrastructure. IC Role / Device Role / Timing Role: Unidirectional shunt protector on differential analog front-end before codec or SLIC. Use Value: Absorbs 10/700μs telecom surges (IEC 61000-4-5 Level 4) without degrading signal integrity due to low capacitance (~100pF). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ26CA-13 | Bi-directional version; symmetrical clamping for AC-coupled or floating lines | Required where signal polarity reverses (e.g., RS-485, CAN bus) or no DC bias exists | Select only if bidirectional clamping is needed; otherwise unidirectional SMAJ26A-13 offers lower leakage |
| SMBJ26A-13 | Same electrical specs but SMB (DO-214AA) package - 3.56–4.06mm width, higher thermal mass | Better steady-state power handling (1.5W vs. 1.0W) and improved board-level thermal dissipation | Prefer for high-temperature environments (>75°C ambient) or where PCB copper area is limited |
Compared with SMAJ26CA-13 and SMBJ26A-13, the SMAJ26A-13 delivers optimal cost, size, and leakage trade-off for unidirectionally biased DC rails where space and leakage current are constrained.
Availability
SMAJ26A-13 is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial programmable logic controllers, USB power delivery subsystems, and telecom line card designs requiring stable component supply across extended production lifecycles.
Supply support for SMAJ26A-13 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.
The SMAJ series belongs to Diodes' transient voltage suppression portfolio, engineered specifically for high-reliability, surface-mount overvoltage protection in automotive, industrial, and communications equipment where compact size and repeatable clamping performance are essential.
FAQ
What is the polarity configuration of SMAJ26A-13?
SMAJ26A-13 is a unidirectional TVS diode, meaning it functions as a Zener-like clamp in reverse bias and conducts like a forward-biased diode during positive transients relative to its cathode. It has a visible cathode band marking and must be oriented with cathode toward the most positive potential in the protected circuit.
Does SMAJ26A-13 meet automotive qualification standards?
SMAJ26A-13 is AEC-Q200 stress-tested and qualified for automotive applications. Its –55°C to +150°C operating range, glass-passivated die, and robust surge ratings align with requirements for engine control units, body electronics, and ADAS power domains per ISO 16750-2 and ISO 7637-2.
How does the SMA package affect thermal performance?
The SMA (DO-214AC) package limits steady-state power dissipation to 1.0W at 75°C lead temperature. Under surge conditions, thermal mass is sufficient for 400W pulses, but sustained power or high ambient temperatures require careful PCB copper pour design and derating per Fig. 6 in DS19005.
Can SMAJ26A-13 replace SMAJ24A-13 in an existing design?
Yes, provided the 26V VRWM meets system margin requirements. SMAJ26A-13 offers higher standoff than SMAJ24A-13 (24V), reducing risk of false triggering on ripple or noise, but increases clamping voltage slightly (42.1V vs. 38.9V). Verify protected IC's absolute maximum ratings before substitution.
SMAJ26A-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- DO-214AC, SMA
- Series:
- SMAJ
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- Yes
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMAJ)
SMAJ26A-13 FAQ
1.How can I place an order for SMAJ26A-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ26A-13 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 SMAJ26A-13 reliable?
The price and inventory of SMAJ26A-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ26A-13 is usually 5 days.
3.What payment methods are accepted for SMAJ26A-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ26A-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ26A-13?
SMAJ26A-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ26A-13 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 SMAJ26A-13?
For technical support, including SMAJ26A-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ26A-13 requirements.
6.How does Aetrix verify that SMAJ26A-13 is sourced from the original manufacturer or authorized distributors?
All SMAJ26A-13 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 SMAJ26A-13 meets industry standards.
7.What is the process for return or replacement of SMAJ26A-13?
All SMAJ26A-13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ26A-13, 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 SMAJ26A-13 part is unused and in its original packaging.
Return procedure for SMAJ26A-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ26A-13 Tags
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