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STMicroelectronics SMA6F70A
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- Part No.:
- SMA6F70A
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-221AC, SMA Flat Leads
- Datasheet:
-
SMA6F70A.pdf
- Description:
- TVS DIODE 70VWM 113VC SMAFLAT
- Quantity:
- Payment:
- Shipping:
Inventory:7,814
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Product details
Overview
SMA6F70A from STMicroelectronics is a unidirectional 600 W transient voltage suppression (TVS) diode designed for primary-level surge protection in DC power rails and signal lines. It features a 70 V stand-off voltage (VRM), 82 V minimum breakdown voltage (VBR), 113 V maximum clamping voltage (VCL) at 5.5 A IPP (10/1000 µs), and operates up to +175 °C junction temperature - enabling robust protection in automotive engine control units, industrial PLC I/O modules, and telecom power supplies.
For engineers reviewing the SMA6F70A datasheet, SMA6F70A pinout, SMA6F70A application, or SMA6F70A 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 footprint layouts.
Technical Context
The SMA6F70A employs planar silicon avalanche technology to deliver precise voltage clamping during ESD and lightning-induced transients. Its unidirectional configuration supports DC-biased lines where reverse polarity protection is not required, and its low dynamic resistance (2.22 Ω) ensures minimal voltage overshoot under fast-rising 8/20 µs surges.
Thermal design is enabled by a 175 °C max junction rating and validated reflow profile per J-STD-020 MSL Level 1. The device maintains stable VBR and VCL across temperature via a +10.5 × 10⁻⁴ /°C voltage temperature coefficient, allowing predictable performance in under-hood or industrial ambient conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRM) | 70 V - Maximum continuous reverse operating voltage before leakage exceeds 0.2 µA |
| Breakdown Voltage (VBR) | 77.9–86.1 V @ 1 mA - Confirmed avalanche onset range ensuring reliable triggering |
| Clamping Voltage (VCL) | 113 V @ 5.5 A (10/1000 µs) - Limits downstream voltage stress during 600 W surge events |
| Peak Pulse Power | 600 W (10/1000 µs), 4 kW (8/20 µs) - Supports IEC 61000-4-5 Level 3/4 surge immunity testing |
| Leakage Current | 0.2 µA @ 25 °C, 1 µA @ 85 °C - Enables low-power standby operation without system loading |
| Junction Temperature | −55 to +175 °C - Allows placement near heat sources in automotive and industrial enclosures |
| Dynamic Resistance | 2.22 Ω - Determines VCL rise slope (ΔV = RD × IPP), critical for protecting 3.3 V/5 V logic interfaces |
Pinout & Package
The SMA6F70A uses the industry-standard SMA (DO-214AC) flat package: 2.25–2.90 mm length, 5.00–5.35 mm width, 2.00 mm height, matte tin-plated leads, and IPC7531-compliant footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (marked band) | Surge current sink | Connected to protected line; conducts avalanche current to ground during overvoltage |
| Anode | Reference node | Tied to system ground or lowest potential rail; completes clamping path for unidirectional operation |
Key Features
| Feature | Design Value |
|---|---|
| High-temperature surge capability | 400 W peak pulse power sustained at Tj = 175 °C - enables placement near power MOSFETs or DC-DC converters |
| ESD immunity compliance | Exceeds IEC 61000-4-2 Level 4: ±25 kV contact / ±30 kV air discharge - eliminates need for secondary ESD stages |
| Low dynamic resistance | 2.22 Ω - minimizes clamping voltage overshoot on 24 V industrial buses during 100 A surge events |
| Lead-free and RoHS-compliant | Matte tin plating, ECOPACK® certified, J-STD-002 solderability verified - meets automotive and industrial environmental mandates |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC Digital Input Module |
|---|---|
Use Scenario: Protects 12 V sensor supply rail against load dump and alternator ripple transients. IC Role / Device Role / Timing Role: Primary TVS clamp placed upstream of LDO regulators and microcontroller power pins. Use Value: Clamps 113 V at 5.5 A to prevent >30 V excursion on 12 V rail, preserving regulator input integrity during ISO 7637-2 Pulse 5a events. | Use Scenario: Shields 24 V digital input optocoupler circuitry from field-wiring induced surges. IC Role / Device Role / Timing Role: Unidirectional surge suppressor on dry-contact input line, referenced to PLC common. Use Value: Limits transient voltage to ≤113 V within 100 ns, preventing optocoupler LED overstress and false triggering. |
| Telecom DC Power Feeder | Smart Meter AC/DC Auxiliary Supply |
Use Scenario: Guards −48 V telecom power feed against lightning-induced longitudinal surges on copper pairs. IC Role / Device Role / Timing Role: Line-to-ground TVS on DC input stage of PoE-powered remote unit. Use Value: Absorbs 4 kW (8/20 µs) surges without degradation, maintaining <1 µA leakage to avoid battery drain in backup systems. | Use Scenario: Protects auxiliary 5 V supply derived from mains rectification against switching transients. IC Role / Device Role / Timing Role: Secondary clamping device after MOV, placed directly at SMPS controller VDD pin. Use Value: Provides precise 113 V clamping with 2.22 Ω RD to limit overshoot below 6 V on 5 V rail during 10/1000 µs transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ70A | Same SMA package, but 400 W (10/1000 µs) rating and higher VCL (115 V @ 5.2 A) | Limited to lower-energy surge environments; less margin for repeated 600 W events | Select when cost sensitivity outweighs long-term surge endurance requirements |
| 1.5SMC70A | Higher 1500 W rating, but larger SMC (DO-214AB) package and 120 V VCL | Requires PCB area increase and offers looser clamping control on low-voltage rails | Choose only when system-level surge test levels exceed IEC 61000-4-5 Level 4 |
Compared with SMAJ70A and 1.5SMC70A, the SMA6F70A delivers superior thermal robustness at 175 °C, tighter clamping (113 V vs. 115–120 V), and optimized dynamic resistance (2.22 Ω) for precision protection of modern low-voltage ICs - making it the preferred choice for space-constrained, high-reliability industrial and automotive designs.
Availability
SMA6F70A is available at Aetrix Electronics and suitable for automotive ECU power protection, industrial PLC I/O hardening, and telecom DC feeder surge suppression requiring stable component supply across extended product lifecycles.
Supply support for SMA6F70A 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, designing and manufacturing analog, MCU, power, and sensing solutions for automotive, industrial, and consumer markets.
The SMA6F Transil series targets high-reliability transient suppression in thermally demanding environments, emphasizing low leakage, high junction temperature operation, and planar process consistency for long-term stability in mission-critical systems.
FAQ
What is the maximum clamping voltage of SMA6F70A under a 10/1000 µs surge?
The maximum clamping voltage is 113 V at 5.5 A peak pulse current (IPP) for a 10/1000 µs waveform, measured at 25 °C ambient. This value increases predictably with junction temperature using the +10.5 × 10⁻⁴ /°C coefficient, reaching ~122 V at 175 °C Tj.
Can SMA6F70A be used in bidirectional signal line protection?
No - SMA6F70A is strictly unidirectional and lacks symmetrical breakdown characteristics. For bidirectional protection (e.g., RS-485, USB), ST recommends the SMA6F70CA variant or discrete back-to-back diode configurations; using SMA6F70A on AC-coupled lines risks forward conduction and failure.
What is the recommended PCB footprint for SMA6F70A?
The device requires the IPC7531-compliant SMA (DO-214AC) footprint: pad length ≥3.9 mm, pad width ≥1.2 mm, center-to-center spacing 4.0 mm, with ≥1.0 cm² total copper area per lead to maintain thermal impedance below 40 °C/W per Figure 11 of DS12564.
Does SMA6F70A meet automotive AEC-Q200 stress testing requirements?
No - while rated for 175 °C operation and compliant with JESD22-A108 temperature cycling, SMA6F70A is not AEC-Q200 qualified. For automotive-grade TVS diodes, ST offers the SMA6Q70A (AEC-Q200 Grade 1) with identical electrical specs and enhanced qualification testing.
SMA6F70A 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):
- 70V (Max)
- Voltage - Breakdown (Min):
- 77.9V
- Voltage - Clamping (Max) @ Ipp:
- 113V
- Current - Peak Pulse (10/1000µs):
- 5.5A
- 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
SMA6F70A FAQ
1.How can I place an order for SMA6F70A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA6F70A 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 SMA6F70A reliable?
The price and inventory of SMA6F70A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA6F70A is usually 5 days.
3.What payment methods are accepted for SMA6F70A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA6F70A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA6F70A?
SMA6F70A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA6F70A 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 SMA6F70A?
For technical support, including SMA6F70A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA6F70A requirements.
6.How does Aetrix verify that SMA6F70A is sourced from the original manufacturer or authorized distributors?
All SMA6F70A 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 SMA6F70A meets industry standards.
7.What is the process for return or replacement of SMA6F70A?
All SMA6F70A units undergo pre-shipment inspection (PSI). If there is an issue with SMA6F70A, 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 SMA6F70A part is unused and in its original packaging.
Return procedure for SMA6F70A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMA6F70A Tags
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