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STMicroelectronics SMA4F5.0A-TR
- Part No.:
- SMA4F5.0A-TR
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-221AC, SMA Flat Leads
- Datasheet:
-
SMA4F5.0A-TR.pdf
- Description:
- TVS DIODE 5V 13.4V SMAFLAT
- Quantity:
- Payment:
- Shipping:
Inventory:6,197
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Product details
Overview
SMA4F5.0A-TR from STMicroelectronics is a unidirectional transient voltage suppression (TVS) diode in SMAflat (DO-221AC) package, designed for electrostatic discharge (ESD) and electrical overstress (EOS) protection. It features 5.0 V stand-off voltage, 7.10 V max clamping voltage at 10 A (10/1000 µs), 400 W peak pulse power, 10 µA max leakage at 25 °C, and operates up to +175 °C junction temperature-ideal for high-reliability SMPS input rails and USB port protection.
For engineers reviewing the SMA4F5.0A-TR datasheet, SMA4F5.0A-TR pinout, SMA4F5.0A-TR application, or SMA4F5.0A-TR equivalent, key selection criteria include clamping voltage margin vs. IC VDD, thermal resistance (Rth(j-l) = 20 °C/W), unidirectional polarity, JEDEC DO-221AC footprint compatibility, and IEC 61000-4-2 Level 4 compliance (±15 kV air / ±8 kV contact).
Technical Context
This TVS diode uses planar junction technology to achieve low leakage (≤10 µA @ 25 °C) and high thermal stability (Tj up to +175 °C). Its dynamic resistance of 0.048 Ω (10/1000 µs) enables precise clamping with minimal voltage overshoot during fast transients.
The device complies with IEC 61000-4-2 (ESD), IEC 61000-4-4 (EFT), and MIL-STD-883G-3015-7 (HBM 25 kV). Its SMAflat package minimizes PCB footprint per IPC 7531 while maintaining mechanical robustness and solderability per MIL-STD-750 Method 2026.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRM) | 5.0 V - Maximum continuous reverse working voltage before conduction begins; sets minimum system operating margin. |
| Breakdown Voltage (VBR) | 6.40–6.74 V @ 1 mA - Guaranteed conduction onset range; ensures predictable turn-on under surge conditions. |
| Clamping Voltage (VCL) | 7.10 V max @ 10 A (10/1000 µs) - Peak voltage seen by protected circuit during standard surge; defines safety margin vs. IC absolute max rating. |
| Peak Pulse Power | 400 W (10/1000 µs), 3 kW (8/20 µs) - Sustained energy-handling capability; determines suitability for IEC 61000-4-4 vs. lightning-level surges. |
| Leakage Current (IRM) | 10 µA max @ 25 °C - Ultra-low standby current; critical for battery-powered or high-impedance sensor interfaces. |
| Junction Temperature Range | −55 °C to +175 °C - Enables operation in automotive under-hood, industrial motor drives, and high-ambient SMPS designs. |
| Thermal Resistance (Rth(j-l)) | 20 °C/W - Junction-to-leads thermal path; informs PCB copper area requirements for sustained surge duty cycles. |
Pinout & Package
Package: SMAflat (JEDEC DO-221AC), surface-mount molded plastic case with non-exposed pad, cathode indicated by band, UL94V-0 rated epoxy, RoHS and ECOPACK2® compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry (unidirectional) | Connected to protected line (e.g., USB D+); conducts only during negative transients when cathode is biased higher. |
| Cathode | Reverse-biased terminal / clamping node | Connected to ground or low-impedance return; sinks surge current and clamps voltage to VCL during positive ESD events. |
Key Features
| Feature | Design Value |
|---|---|
| Low clamping voltage | VCL = 7.10 V max @ 10 A (10/1000 µs) - Provides ≥1.9 V margin below typical 9 V logic rail, reducing risk of latch-up in microcontrollers. |
| High junction temperature rating | Tj(max) = +175 °C - Supports placement near heat sources (e.g., MOSFETs, inductors) without derating in industrial power supplies. |
| Ultra-low leakage | IRM ≤ 10 µA @ 25 °C - Prevents signal distortion in precision analog front-ends and extends battery life in portable ESD-protected ports. |
| ECOPACK2® halogen-free | Lead-free second-level interconnect, UL94V-0 flammability - Meets global environmental compliance (RoHS, REACH) without sacrificing thermal or electrical performance. |
Applications
| USB 2.0 Data Line Protection | Industrial SMPS Input Stage |
|---|---|
Use Scenario: Protecting D+ and D− lines of USB 2.0 peripherals against contact ESD (±8 kV) and cable discharge events. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between data line and chassis ground, activated within <1 ns to limit voltage to <7.1 V. Use Value: Prevents damage to USB transceivers (e.g., TUSB2036) while maintaining signal integrity due to low capacitance (<6 pF @ 0 V) and minimal leakage. | Use Scenario: Safeguarding primary-side controller ICs (e.g., L6565) and gate drivers on AC/DC flyback converters against line surges. IC Role / Device Role / Timing Role: Parallel-connected TVS across bulk capacitor or rectifier output, absorbing 400 W transients without thermal runaway. Use Value: Enables reliable operation at +125 °C ambient via 175 °C Tj rating and 20 °C/W Rth(j-l), reducing need for oversized heatsinking. |
| Automotive Body Control Module (BCM) Inputs | POS Terminal Serial Interface Protection |
Use Scenario: Shielding LIN bus or switch inputs in BCMs exposed to load dump and jump-start transients. IC Role / Device Role / Timing Role: Unidirectional clamp on 12 V supply rail or signal line, triggered by >6.4 V breakdown to shunt current to ground. Use Value: Survives repeated 8/20 µs surges up to 3 kW (e.g., ISO 7637-2 Pulse 1/2a), extending field lifetime in harsh vehicle environments. | Use Scenario: Securing RS-232 or RS-485 transceivers (e.g., MAX3232) in point-of-sale terminals against user-induced ESD. IC Role / Device Role / Timing Role: Low-capacitance TVS on TX/RX lines referenced to local ground, clamping ±15 kV air discharge per IEC 61000-4-2 Level 4. Use Value: Maintains data rate integrity (up to 1 Mbps) with <6 pF junction capacitance and avoids false triggering due to 10 µA leakage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ5.0A | Same SMA package but DO-214AC outline; Rth(j-l) = 25 °C/W; VCL = 9.2 V @ 10 A (10/1000 µs) | Higher clamping voltage reduces safety margin for 5 V systems; less suitable for tight-rail microcontroller I/O protection. | Select SMA4F5.0A-TR where lower VCL and superior thermal resistance are required for high-density layouts. |
| 1.5SMC5.0A | DO-214AB package; larger footprint (7.11 × 6.22 mm); 1.5 kW peak power (10/1000 µs); VCL = 9.6 V @ 100 A | Better for high-energy surges but incompatible with space-constrained USB/POS designs; requires 3× PCB area. | Choose SMA4F5.0A-TR when board space is limited and 400 W surge immunity suffices for end-equipment certification. |
Compared with SMAJ5.0A and 1.5SMC5.0A, SMA4F5.0A-TR delivers tighter clamping (7.10 V vs. ≥9.2 V), lower thermal resistance (20 vs. 25 °C/W), and smaller DO-221AC footprint-making it optimal for compact, thermally demanding, and low-voltage-rail ESD protection.
Availability
SMA4F5.0A-TR is available at Aetrix Electronics and suitable for USB interface protection, industrial SMPS input stages, automotive body control module inputs, and POS terminal serial interface protection requiring stable component supply and long-term lifecycle support.
Supply support for SMA4F5.0A-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, power, and digital consumer markets.
The SMA4F series belongs to ST's Transil™ TVS portfolio, engineered specifically for high-reliability ESD/EFT protection in space-constrained, high-temperature applications such as switched-mode power supplies and automotive electronics.
FAQ
What is the maximum allowable surge current for SMA4F5.0A-TR under IEC 61000-4-2 testing?
The SMA4F5.0A-TR is rated for ±15 kV air discharge and ±8 kV contact discharge per IEC 61000-4-2 Level 4. Its peak pulse current capability is 10 A (10/1000 µs) and 174 A (8/20 µs), validated under standardized test waveforms. These values correspond directly to its 400 W and 3 kW peak power ratings, respectively, and define its safe operational envelope during ESD events.
Does SMA4F5.0A-TR require a heatsink for continuous operation at 125 °C ambient?
No external heatsink is required. With Rth(j-l) = 20 °C/W and Tj(max) = +175 °C, the device supports 125 °C ambient temperature using only standard PCB copper (≥1 cm² per lead per Figure 8). Thermal performance is optimized for SMAflat's low-profile leads and planar junction, enabling direct mounting without thermal vias in most industrial applications.
How does the voltage temperature coefficient (αT = 5.7 × 10−4/°C) affect breakdown voltage at elevated temperatures?
Using VBR@Tj = VBR@25 °C × [1 + αT × (Tj − 25)], VBR increases by ~0.38 V at +125 °C ambient (assuming Tj ≈ 150 °C). This positive TC ensures the device remains safely above system VDD during thermal stress, preventing premature conduction and false triggering in high-temperature environments.
Can SMA4F5.0A-TR be used in bidirectional signal lines like RS-485?
No-it is unidirectional only, with cathode marking indicating polarity. For bidirectional lines, a pair of SMA4F5.0A-TR devices (anode-to-anode or cathode-to-cathode) may be used differentially, but ST recommends dedicated bidirectional TVS devices (e.g., SMA4F5.0AY) for guaranteed symmetrical clamping and validated layout performance.
SMA4F5.0A-TR 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):
- 5V
- Voltage - Breakdown (Min):
- 6.4V
- Voltage - Clamping (Max) @ Ipp:
- 13.4V
- Current - Peak Pulse (10/1000µs):
- 174A (8/20µs)
- 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
SMA4F5.0A-TR FAQ
1.How can I place an order for SMA4F5.0A-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA4F5.0A-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 SMA4F5.0A-TR reliable?
The price and inventory of SMA4F5.0A-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA4F5.0A-TR is usually 5 days.
3.What payment methods are accepted for SMA4F5.0A-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA4F5.0A-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA4F5.0A-TR?
SMA4F5.0A-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA4F5.0A-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 SMA4F5.0A-TR?
For technical support, including SMA4F5.0A-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA4F5.0A-TR requirements.
6.How does Aetrix verify that SMA4F5.0A-TR is sourced from the original manufacturer or authorized distributors?
All SMA4F5.0A-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 SMA4F5.0A-TR meets industry standards.
7.What is the process for return or replacement of SMA4F5.0A-TR?
All SMA4F5.0A-TR units undergo pre-shipment inspection (PSI). If there is an issue with SMA4F5.0A-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 SMA4F5.0A-TR part is unused and in its original packaging.
Return procedure for SMA4F5.0A-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMA4F5.0A-TR Tags
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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