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STMicroelectronics SMAJ26CA-TR
- Part No.:
- SMAJ26CA-TR
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ26CA-TR.pdf
- Description:
- TVS DIODE 26VWM 53.5VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:36,602
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Product details
Overview
SMAJ26CA-TR from STMicroelectronics is a bidirectional transient voltage suppression (TVS) diode in SMA package, designed for IEC 61000-4-2 ESD protection (30 kV air/contact) and IEC 61000-4-4 surge immunity (4 kV level 4). It features a 26 V standoff voltage (VRM), 42.1 V clamping voltage at 9.5 A (10/1000 µs), 400 W peak pulse power, and low leakage (0.2 µA @ 25 °C), making it suitable for protecting USB, HDMI, and industrial I/O interfaces against fast transients.
For engineers reviewing the SMAJ26CA-TR datasheet, SMAJ26CA-TR pinout, SMAJ26CA-TR application, or SMAJ26CA-TR equivalent, key selection criteria include bidirectional clamping capability, 150 °C junction temperature rating, JEDEC DO-214AC (SMA) package compatibility, low dynamic resistance (1.07 Ω), and compliance with IPC-7531 footprint standards.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds 26 V (VRM), it avalanches to clamp transients at ≤42.1 V (VCL) under 9.5 A surge (10/1000 µs), limiting energy dissipation in downstream circuitry. Its planar silicon construction ensures stable leakage (<1 µA up to 85 °C) and robust thermal performance (Tj max = 150 °C).
The device meets IEC 61000-4-2 level 4 (30 kV contact/air discharge) and IEC 61000-4-4 level 4 (4 kV), with dynamic resistance of 1.07 Ω enabling rapid response to sub-microsecond surges. Bidirectional symmetry allows identical clamping behavior for positive and negative transients without polarity-sensitive placement.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRM) | 26 V - Maximum continuous reverse operating voltage before avalanche conduction begins. |
| Clamping Voltage (VCL) | 42.1 V at 9.5 A (10/1000 µs) - Peak voltage seen by protected circuit during worst-case surge event. |
| Peak Pulse Power (PPP) | 400 W (10/1000 µs) - Sustained transient energy handling capacity per IEC standard waveform. |
| Leakage Current (IRM) | 0.2 µA @ 25 °C - Minimal DC loading on signal lines, critical for high-impedance sensor or analog interfaces. |
| Junction Temperature (Tj) | -55 to +150 °C - Enables reliable operation in automotive engine compartments and industrial control enclosures. |
| Dynamic Resistance (RD) | 1.07 Ω - Low impedance during clamping reduces voltage overshoot and improves protection margin. |
| ESD Rating | 30 kV contact & air discharge (IEC 61000-4-2 level 4) - Exceeds industrial and medical equipment immunity requirements. |
Pinout & Package
Package: SMA (DO-214AC), JEDEC registered, IPC-7531 compliant footprint, matte tin-plated leads, MSL level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (K) | Surge current sink (bidirectional reference node) | Common terminal for both polarities; connects to ground or common reference plane for symmetrical clamping. |
| Anode (A) | Surge current source (bidirectional reference node) | Paired with cathode to form symmetric breakdown path; no polarity marking required in CA variant. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines (e.g., RS-485, CAN, audio) without polarity constraints. |
| Low dynamic resistance (1.07 Ω) | Reduces clamping voltage overshoot during fast-rising transients, improving margin for 3.3 V/5 V logic interfaces. |
| High-temperature reliability (150 °C Tj max) | Supports long-term deployment in thermally demanding environments such as motor drives and power supply front-ends. |
| JEDEC DO-214AC (SMA) package | Ensures mechanical compatibility with automated assembly and IPC-7531 land patterns for consistent solder joint integrity. |
| UL94 V0 flammability rating | Meets safety requirements for enclosed industrial and consumer electronics where flame propagation must be prevented. |
Applications
| Industrial I/O Protection | USB 2.0 Interface Protection |
|---|---|
|
Use Scenario: Protecting PLC digital input modules from induced surges on 24 V field wiring exposed to relay switching and lightning coupling. IC Role / Device Role / Timing Role: Shunt TVS diode placed between signal line and chassis ground, clamping transients within 1 ns to prevent controller latch-up. Use Value: 42.1 V clamping ensures microcontroller GPIOs (rated 36 V abs max) remain within safe operating area during 4 kV IEC 61000-4-4 events. |
Use Scenario: Safeguarding USB D+ and D− data lines against ESD events during hot-plug insertion in embedded host devices. IC Role / Device Role / Timing Role: Bidirectional TVS placed differential across D+/D− and common-mode to ground, suppressing ±30 kV ESD pulses without signal distortion. Use Value: 1.07 Ω dynamic resistance minimizes signal rise-time degradation, preserving USB 2.0 eye diagram integrity up to 480 Mbps. |
| HDMI Source Port Protection | Automotive Body Control Module |
|
Use Scenario: Shielding HDMI TMDS channels from electrostatic discharge during cable mating in AV receivers and set-top boxes. IC Role / Device Role / Timing Role: Low-capacitance bidirectional TVS (typ. 100 pF @ 1 V) placed on each TMDS pair, referenced to shield ground. Use Value: 0.2 µA leakage prevents DC bias shift on high-impedance TMDS termination, maintaining DC balance for AC-coupled signaling. |
Use Scenario: Protecting LIN bus transceivers and sensor inputs in body control units subjected to load dump and jump-start transients. IC Role / Device Role / Timing Role: Secondary surge suppressor mounted at connector entry point, working with primary LC filtering to limit energy reaching IC pins. Use Value: 150 °C junction rating enables uninterrupted operation during under-hood temperature excursions up to 125 °C ambient + self-heating. |
Availability
SMAJ26CA-TR is available at Aetrix Electronics and suitable for industrial I/O protection, USB 2.0 interface hardening, and HDMI source port safeguarding requiring stable component supply across multi-year production cycles.
Supply support for SMAJ26CA-TR 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, delivering innovative solutions across automotive, industrial, and power domains with over 40 years of analog and protection device expertise.
The SMAJ series belongs to ST's transient protection portfolio, engineered specifically for high-reliability board-level ESD and surge suppression in space-constrained applications where thermal stability and low leakage are critical.
FAQ
What is the difference between SMAJ26A-TR and SMAJ26CA-TR?
SMAJ26A-TR is unidirectional (anode-cathode asymmetry), intended for DC-biased lines like power rails; SMAJ26CA-TR is bidirectional, with symmetric breakdown in both polarities, suited for AC signals or floating interfaces such as USB, RS-485, or audio. Their clamping voltages and surge ratings are identical, but CA variants require no polarity orientation during placement.
Can SMAJ26CA-TR be used for 24 V industrial power rail protection?
No - its 26 V standoff voltage provides insufficient margin above 24 V nominal rails, risking premature conduction during normal operation. For 24 V systems, SMAJ33CA-TR (33 V VRM) or SMAJ36CA-TR is recommended to ensure ≥20 % headroom while maintaining clamping below 60 V.
Does SMAJ26CA-TR meet automotive AEC-Q200 requirements?
No - SMAJ26CA-TR is not AEC-Q200 qualified. ST offers the Automotive-grade SM8S series (e.g., SM8S26CA) for automotive applications, which undergo extended temperature cycling, humidity testing, and failure analysis per AEC-Q200 Rev H.
How does the 1.07 Ω dynamic resistance impact system-level protection design?
This value directly determines voltage overshoot during fast transients: for a 10 A surge, additional overshoot beyond VCL is ~10.7 V. Designers must subtract this from the protected IC's absolute maximum rating to verify margin - e.g., a 50 V-rated receiver requires VCL ≤ 39.3 V, satisfied here by 42.1 V only if surge current stays ≤9.5 A.
SMAJ26CA-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-214AC, SMA
- Series:
- SMAJ, TRANSIL™
- 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:
- 53.5V
- Current - Peak Pulse (10/1000µs):
- 43A (8/20µs)
- 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)
SMAJ26CA-TR FAQ
1.How can I place an order for SMAJ26CA-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ26CA-TR 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 SMAJ26CA-TR reliable?
The price and inventory of SMAJ26CA-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ26CA-TR is usually 5 days.
3.What payment methods are accepted for SMAJ26CA-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ26CA-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ26CA-TR?
SMAJ26CA-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ26CA-TR 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 SMAJ26CA-TR?
For technical support, including SMAJ26CA-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ26CA-TR requirements.
6.How does Aetrix verify that SMAJ26CA-TR is sourced from the original manufacturer or authorized distributors?
All SMAJ26CA-TR 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 SMAJ26CA-TR meets industry standards.
7.What is the process for return or replacement of SMAJ26CA-TR?
All SMAJ26CA-TR units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ26CA-TR, 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 SMAJ26CA-TR part is unused and in its original packaging.
Return procedure for SMAJ26CA-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ26CA-TR Tags
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