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STMicroelectronics SMA4F10A
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- Part No.:
- SMA4F10A
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-221AC, SMA Flat Leads
- Datasheet:
-
SMA4F10A.pdf
- Description:
- TVS DIODE 10VWM 21.7VC SMAFLAT
- Quantity:
- Payment:
- Shipping:
Inventory:426
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Product details
Overview
SMA4F10A from STMicroelectronics is a unidirectional 400 W transient voltage suppression (TVS) diode designed for primary-level surge protection in DC power rails and signal lines. It features a 10 V stand-off voltage (VRM), 11.1–12.3 V breakdown voltage (VBR), 17 V clamping voltage (VCL) at 23.5 A peak pulse current (IPP), and operates up to 175 °C junction temperature-ideal for automotive body control modules and industrial PLC I/O protection.
For engineers reviewing the SMA4F10A datasheet, SMA4F10A pinout, SMA4F10A application, or SMA4F10A equivalent, key selection criteria include clamping performance under 10/1000 µs surges, low leakage (<0.2 µA @ 25 °C), high-temperature reliability, and compatibility with IPC7531-compliant SMA flat footprint layouts.
Technical Context
The SMA4F10A uses planar silicon avalanche technology to deliver precise, repeatable clamping during fast transients. Its unidirectional configuration enables integration on positive-rail-only paths without reverse-bias concerns, and its low dynamic resistance (0.2 Ω) ensures minimal voltage overshoot under high-current 8/20 µs surges.
Thermal design is supported by a maximum junction temperature of 175 °C and validated thermal impedance curves showing <100 °C/W junction-to-ambient on standard FR4 with recommended copper area. The device meets IEC 61000-4-2 Level 4 ESD immunity (±25 kV contact / ±30 kV air) and complies with UL94 V0 flammability and J-STD-020 MSL Level 1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRM) | 10 V - Maximum continuous reverse operating voltage before leakage exceeds 0.2 µA; sets minimum system rail margin. |
| Breakdown Voltage (VBR) | 11.1–12.3 V @ 1 mA - Avalanche onset range defining turn-on threshold under transient stress. |
| Clamping Voltage (VCL) | 17 V @ 23.5 A (10/1000 µs) - Peak voltage seen by protected circuit during worst-case surge; determines downstream component stress. |
| Peak Pulse Power (PPP) | 400 W (10/1000 µs) - Sustained surge energy handling at 25 °C ambient; derates to 200 W at 175 °C Tj. |
| Leakage Current (IRM) | 0.2 µA @ 25 °C, 1 µA @ 85 °C - Ensures negligible standby power loss and signal integrity in high-impedance sensor interfaces. |
| Junction Temperature Range | −55 to +175 °C - Enables deployment in under-hood automotive, motor drive controls, and industrial enclosures without derating. |
| ESD Rating | ±25 kV contact / ±30 kV air (IEC 61000-4-2) - Exceeds Level 4 immunity requirements for human-body-model robustness. |
Pinout & Package
The SMA4F10A is housed in an industry-standard SMA (DO-214AC) flat package with matte tin-plated leads, compliant with IPC7531 footprint and JEDEC MO-136AA outline. Dimensions: 4.6 mm × 2.9 mm × 2.3 mm (L × W × H), weight 39 mg.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (marked band) | Surge return path | Connected to ground or low-impedance reference; carries full IPP during clamping event. |
| Anode | Protected line input | Connected to line being safeguarded (e.g., 12 V supply rail); reverse-biased during normal operation. |
Key Features
| Feature | Design Value |
|---|---|
| High-temperature surge capability | 200 W peak pulse power at 175 °C Tj - maintains protection integrity in thermally constrained environments. |
| Low dynamic resistance | 0.2 Ω - minimizes VCL rise under increasing IPP, improving clamping predictability across surge magnitudes. |
| Ultra-low leakage | 0.2 µA @ 25 °C - preserves battery life in always-on systems and avoids false triggering in high-Z analog inputs. |
| ESD-hardened construction | Exceeds IEC 61000-4-2 Level 4 - eliminates need for secondary ESD components in front-end interfaces. |
| Lead-free & RoHS-compliant | Matte tin plating, ECOPACK® certified - supports automated reflow (J-STD-020 MSL Level 1) and environmental compliance. |
Applications
| Automotive Body Control Module | Industrial PLC Digital Input |
|---|---|
Use Scenario: 12 V supply rail protection against load dump and ISO 7637-2 pulses in BCM microcontroller power domains. IC Role / Device Role / Timing Role: Primary TVS clamp placed between fuse and LDO input to limit transient overvoltage before regulation stage. Use Value: Clamps to 17 V within 1 ns, preventing LDO overvoltage failure and ensuring MCU brown-out reset integrity. |
Use Scenario: 24 V digital input channel protection against field-wiring induced surges and relay coil flyback. IC Role / Device Role / Timing Role: Unidirectional shunt protector mounted directly at terminal block entry point. Use Value: Withstands 400 W surges while maintaining <1 µA leakage at 85 °C, preserving input logic threshold stability. |
| Smart Meter Power Supply | Telecom Line Interface |
Use Scenario: AC/DC auxiliary supply output protection in revenue-grade smart meters exposed to grid transients. IC Role / Device Role / Timing Role: Secondary surge suppressor after MOV, providing precise clamping for isolated DC-DC controller ICs. Use Value: 175 °C rating allows placement near heat-generating transformers without derating; 0.2 Ω RD ensures tight VCL control. |
Use Scenario: Protection of RS-485 transceiver VCC and bus pins in outdoor telecom cabinets. IC Role / Device Role / Timing Role: Rail-to-rail TVS on 3.3 V/5 V supply and differential bus lines to absorb lightning-induced common-mode surges. Use Value: Meets IEC 61000-4-5 (4 kV) when used with series impedance; low capacitance (<100 pF) avoids signal integrity degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ10A (Bourns) | Same SMA package, 400 W rating, but higher VBR (11.1–12.8 V) and VCL (18.2 V @ 22.5 A); 0.35 µA IRM @ 25 °C. | Slightly looser clamping tolerance; less suitable for tight 12 V rail margins where 17 V VCL is critical. | Select when broader VBR tolerance is acceptable and legacy Bourns sourcing is preferred. |
| SMBJ10A (Littelfuse) | SMB package (larger footprint), 600 W rating, VBR 11.1–12.8 V, VCL 17.0 V @ 35.1 A; 1 µA IRM @ 25 °C. | Higher power handling but incompatible footprint; requires PCB redesign and offers no benefit for 400 W-class systems. | Choose only if board layout allows SMB and future surge margin expansion is required. |
Compared with SMAJ10A and SMBJ10A, the SMA4F10A delivers tighter VCL consistency (17 V vs. 17–18.2 V), lower leakage (0.2 µA), and optimized thermal performance at 175 °C-making it preferable for space-constrained, high-reliability automotive and industrial designs where precision clamping and long-term stability are prioritized.
Availability
SMA4F10A is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC I/O protection, smart meter auxiliary supplies, and telecom line interface circuits requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for SMA4F10A 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 automotive, industrial, and power management solutions with vertical manufacturing and broad IP portfolio.
The SMA4F Transil series targets high-reliability transient suppression in harsh-environment applications-designed specifically for automotive electronics, industrial automation, and energy metering where long-term stability at elevated junction temperatures is mandatory.
FAQ
What is the maximum peak pulse current (IPP) the SMA4F10A can handle?
The SMA4F10A sustains 23.5 A peak pulse current under a 10/1000 µs waveform at 25 °C ambient, with clamping voltage limited to 17 V. At elevated junction temperatures (e.g., 175 °C), IPP remains valid but must be applied within the derated 200 W peak power envelope per Figure 3 in DS12542.
Does the SMA4F10A meet automotive qualification standards?
While not AEC-Q200 qualified as a standalone part, the SMA4F10A is widely deployed in automotive body control modules due to its 175 °C junction rating, IEC 61000-4-2 Level 4 ESD compliance, and robust thermal performance. System-level qualification per ISO 16750-2 is achievable with proper layout and thermal management.
Can SMA4F10A be used in bidirectional configurations?
No-the SMA4F10A is strictly unidirectional. Its internal structure lacks symmetrical avalanche characteristics; attempting bidirectional use results in undefined reverse conduction and potential failure. For bidirectional protection, ST recommends the SMA4F10AY (dual-diode configuration) or discrete back-to-back pairing with appropriate derating.
How does the 0.2 Ω dynamic resistance impact circuit protection?
A dynamic resistance of 0.2 Ω means the clamping voltage increases by only 0.2 V per additional ampere of surge current beyond the rated IPP. This linear relationship ensures predictable VCL behavior across varying surge magnitudes-critical for protecting downstream ICs with narrow absolute maximum voltage ratings.
SMA4F10A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-221AC, SMA Flat Leads
- Series:
- SMA4F, TRANSIL™
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 10V
- Voltage - Breakdown (Min):
- 11.1V
- Voltage - Clamping (Max) @ Ipp:
- 21.7V
- Current - Peak Pulse (10/1000µs):
- 23.5A
- Power - Peak Pulse:
- 400W
- 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
SMA4F10A FAQ
1.How can I place an order for SMA4F10A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA4F10A 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 SMA4F10A reliable?
The price and inventory of SMA4F10A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA4F10A is usually 5 days.
3.What payment methods are accepted for SMA4F10A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA4F10A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA4F10A?
SMA4F10A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA4F10A 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 SMA4F10A?
For technical support, including SMA4F10A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA4F10A requirements.
6.How does Aetrix verify that SMA4F10A is sourced from the original manufacturer or authorized distributors?
All SMA4F10A 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 SMA4F10A meets industry standards.
7.What is the process for return or replacement of SMA4F10A?
All SMA4F10A units undergo pre-shipment inspection (PSI). If there is an issue with SMA4F10A, 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 SMA4F10A part is unused and in its original packaging.
Return procedure for SMA4F10A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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