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STMicroelectronics SMA6F26A
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- Part No.:
- SMA6F26A
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-221AC, SMA Flat Leads
- Datasheet:
-
SMA6F26A.pdf
- Description:
- TVS DIODE 26VWM 42.1VC SMAFLAT
- Quantity:
- Payment:
- Shipping:
Inventory:6,776
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Product details
Overview
SMA6F26A from STMicroelectronics is a unidirectional 600 W transient voltage suppression (TVS) diode designed for primary-level surge protection in DC power lines and signal interfaces. It features a 26 V stand-off voltage (VRM), 42.1 V clamping voltage at 14.9 A (10/1000 µs), and operates up to 175 °C junction temperature-enabling robust protection in automotive power supplies and industrial I/O modules.
For engineers reviewing the SMA6F26A datasheet, SMA6F26A pinout, SMA6F26A application, or SMA6F26A equivalent, key selection criteria include clamping performance under 10/1000 µs surges, low leakage (<1 µA at 85 °C), compliance with IEC 61000-4-2 Level 4 (±25 kV contact / ±30 kV air), and SMA package thermal reliability in high-density PCB layouts.
Technical Context
This TVS diode uses planar silicon technology to achieve low dynamic resistance (0.288 Ω) and stable breakdown behavior across temperature. Its unidirectional configuration supports DC-biased circuits where reverse polarity is not expected, such as 24 V industrial control inputs or automotive body electronics supply rails.
The device meets IEC 61000-4-2 ESD immunity requirements without external series impedance and maintains clamping integrity up to 175 °C junction temperature-critical for under-hood automotive applications and enclosed industrial enclosures with limited airflow.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRM) | 26 V - Maximum continuous reverse operating voltage before leakage exceeds 0.2 µA at 25 °C |
| Breakdown Voltage (VBR) | 28.9–31.9 V at 1 mA - Confirmed turn-on threshold ensuring predictable surge initiation |
| Clamping Voltage (VCL) | 42.1 V at 14.9 A (10/1000 µs) - Limits downstream voltage stress during 600 W transient events |
| Peak Pulse Power | 600 W (10/1000 µs), 4 kW (8/20 µs) - Supports both lightning-induced and ESD-type transients per IEC standards |
| Leakage Current | 0.2 µA @ 25 °C, 1 µA @ 85 °C - Minimizes standby power loss in always-on systems |
| Junction Temperature Range | −55 to +175 °C - Enables operation in engine compartments and sealed industrial controllers |
| ESD Rating | ±25 kV contact / ±30 kV air (IEC 61000-4-2 Level 4) - Exceeds automotive and industrial immunity requirements |
Pinout & Package
The SMA6F26A is housed in an industry-standard SMA (DO-214AC) surface-mount package with two terminals: Cathode (marked band) and Anode. The matte tin-plated leads comply with J-STD-002 and support lead-free reflow per JEDEC J-STD-020 MSL level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Surge current sink | Connected to protected line; conducts transient energy to ground when Vline > VBR |
| Anode | Reference node | Tied to system ground or lower-potential rail; completes conduction path during overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| High-temperature reliability | Rated for continuous operation at Tj = 175 °C-no derating required in thermally constrained environments |
| Low dynamic resistance | 0.288 Ω enables tighter clamping and reduced voltage overshoot during fast-rising transients |
| Planar junction construction | Delivers consistent VBR tolerance and low leakage vs. conventional diffused-junction TVS devices |
| UL94 V0 & JEDEC-compliant footprint | Validated for automated assembly and flame-retardant PCB compliance in safety-critical designs |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input |
|---|---|
Use Scenario: Protecting 24 V supply rail against load-dump and ISO 7637-2 pulse 5a/b transients. IC Role / Device Role / Timing Role: Primary clamping element placed directly at connector entry point to limit voltage seen by upstream regulators and microcontrollers. Use Value: Clamps to 42.1 V within 10/1000 µs, preventing damage to 36 V-rated LDOs and enabling single-stage protection without series impedance. |
Use Scenario: Safeguarding 24 V digital input channels from field-wiring induced surges and ESD events. IC Role / Device Role / Timing Role: Unidirectional TVS connected between input terminal and common ground to shunt transients before they reach optocoupler or Schmitt-trigger input stages. Use Value: 1 µA leakage at 85 °C avoids false triggering in high-impedance sensing circuits while maintaining <100 ns response time. |
| Telecom Power Supply Input | Medical Equipment DC Bus |
Use Scenario: Secondary surge protection on −48 V telecom rectifier outputs exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Standoff-rated TVS placed after bulk filtering but before point-of-load converters to absorb residual energy missed by upstream MOVs. Use Value: 4 kW peak power rating (8/20 µs) handles high-energy ring-wave transients without thermal runaway at elevated ambient temperatures. |
Use Scenario: Protecting isolated 24 V DC bus in portable diagnostic equipment from ESD coupling via USB or Ethernet ports. IC Role / Device Role / Timing Role: Fast-response TVS integrated into power entry filter stage to suppress coupled transients before reaching isolated DC/DC modules. Use Value: UL94 V0 flammability rating and 175 °C Tj max ensure compliance with IEC 60601-1 mechanical and thermal safety requirements. |
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 (Bourns) | Same SMA package, 26 V VRM, but lower 400 W peak power (10/1000 µs) and higher VCL (45.7 V @ 13.1 A) | Limited to lower-energy transients; unsuitable for automotive load-dump where 600 W capability is mandated | Select only if system-level testing confirms 400 W margin is sufficient and cost sensitivity outweighs clamping performance |
| SMBJ26A (Littelfuse) | SMB package (larger footprint), same 26 V VRM, 600 W rating, but higher thermal resistance (RθJA ≈ 50 °C/W vs. SMA6F26A's ~40 °C/W) | Requires larger copper pour for equivalent thermal management; less suitable for space-constrained PCBs | Prefer when board layout allows SMB footprint and higher mounting height is acceptable for improved airflow |
Compared with SMAJ26A and SMBJ26A, the SMA6F26A delivers superior clamping voltage (42.1 V vs. ≥45.7 V), lower thermal resistance in the compact SMA outline, and verified 175 °C operation-making it optimal for high-reliability, space-limited, and thermally aggressive applications.
Availability
SMA6F26A is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC I/O modules, telecom power supplies, and medical DC bus protection requiring stable component supply and long-term lifecycle assurance.
Supply support for SMA6F26A 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, specializing in power management, analog, MEMS, and automotive-grade ICs with vertical manufacturing capabilities.
The SMA6F Transil series targets high-reliability transient suppression in harsh-environment applications-designed specifically for automotive, industrial, and telecom systems demanding extended temperature operation and IEC 61000-4-2 compliance.
FAQ
What is the maximum allowable peak pulse current for SMA6F26A under 10/1000 µs waveform?
The SMA6F26A sustains 14.9 A peak pulse current at its specified 42.1 V clamping voltage for 10/1000 µs transients. This value is measured at Tj = 25 °C and remains valid up to Tj = 175 °C, with VCL increasing predictably per αT = 9.7 × 10−4/°C as junction temperature rises.
Does SMA6F26A require series impedance for proper operation in ESD protection circuits?
No series impedance is required for IEC 61000-4-2 ESD protection-the device is characterized to clamp ±25 kV contact discharge without external current-limiting components. Its low dynamic resistance (0.288 Ω) and fast response enable direct placement at I/O connectors or power entry points.
How does the SMA6F26A's leakage current compare to competing TVS diodes at elevated temperature?
At 85 °C, SMA6F26A exhibits ≤1 µA leakage at 26 V VRM-significantly lower than typical alternatives like SMAJ26A (≤5 µA) and SMBJ26A (≤2.5 µA). This ensures minimal impact on high-impedance sensor bias networks and battery-powered standby circuits.
Can SMA6F26A be used in bidirectional signal line protection?
No-it is strictly unidirectional and must be oriented with cathode toward the protected line. For bidirectional protection (e.g., RS-485, USB D+/D−), use the complementary SMA6F26CA variant or select a dedicated bidirectional TVS with matched positive/negative clamping characteristics.
SMA6F26A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-221AC, SMA Flat Leads
- Series:
- SMA6F, TRANSIL™
- 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):
- 14.9A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMAflat
SMA6F26A FAQ
1.How can I place an order for SMA6F26A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA6F26A 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 SMA6F26A reliable?
The price and inventory of SMA6F26A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA6F26A is usually 5 days.
3.What payment methods are accepted for SMA6F26A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA6F26A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA6F26A?
SMA6F26A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA6F26A 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 SMA6F26A?
For technical support, including SMA6F26A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA6F26A requirements.
6.How does Aetrix verify that SMA6F26A is sourced from the original manufacturer or authorized distributors?
All SMA6F26A 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 SMA6F26A meets industry standards.
7.What is the process for return or replacement of SMA6F26A?
All SMA6F26A units undergo pre-shipment inspection (PSI). If there is an issue with SMA6F26A, 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 SMA6F26A part is unused and in its original packaging.
Return procedure for SMA6F26A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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