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STMicroelectronics SMA6F154A
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- Part No.:
- SMA6F154A
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-221AC, SMA Flat Leads
- Datasheet:
-
SMA6F154A.pdf
- Description:
- TVS DIODE 154VWM 246VC SMAFLAT
- Quantity:
- Payment:
- Shipping:
Inventory:4,820
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Product details
Overview
SMA6F154A from STMicroelectronics is a unidirectional 600 W transient voltage suppression (TVS) diode designed for high-reliability surge protection in power rails and signal lines. It features a 154 V stand-off voltage (VRM), 171–189 V breakdown voltage (VBR), and clamps to ≤246 V at 1 A (10/1000 µs), operating up to 175 °C junction temperature in SMA flat package.
For engineers reviewing the SMA6F154A datasheet, SMA6F154A pinout, SMA6F154A application, or SMA6F154A equivalent, key selection criteria include clamping voltage under 1 A pulse, low leakage (≤0.2 µA @ 25 °C), IEC 61000-4-2 Level 4 ESD robustness (±25 kV contact / ±30 kV air), and thermal stability across automotive and industrial ambient conditions.
Technical Context
This TVS diode uses planar silicon technology to achieve low dynamic resistance (10.2 Ω at 10/1000 µs) and stable voltage temperature coefficient (αT = 10.8 × 10⁻⁴ /°C). Its unidirectional configuration enables DC-biased rail protection without reverse conduction during normal operation.
Clamping performance is defined by VCL = VBR(max) + RD × IPP, with verified VCL ≤246 V at 1 A (10/1000 µs) and ≤317 V at 12.6 A (8/20 µs). Junction capacitance remains below 1 nF at VR = 154 V (f = 1 MHz), supporting high-speed data line compatibility.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRM) | 154 V - Maximum continuous reverse voltage before leakage exceeds 0.2 µA at 25 °C |
| Breakdown Voltage (VBR) | 171–189 V at 1 mA - Ensures reliable triggering above nominal rail voltage with margin |
| Clamping Voltage (VCL) | 246 V at 1 A (10/1000 µs) - Limits transient energy delivered to downstream circuitry |
| Peak Pulse Power | 600 W (10/1000 µs), 4 kW (8/20 µs) - Supports IEC 61000-4-5 surge immunity testing |
| Leakage Current | 0.2 µA @ 25 °C, 1 µA @ 85 °C - Minimizes standby power loss in battery-backed systems |
| Junction Temperature Range | −55 to +175 °C - Enables deployment in under-hood automotive or industrial power supply environments |
| ESD Rating | ±25 kV contact / ±30 kV air (IEC 61000-4-2 Level 4) - Exceeds standard human-body-model requirements |
Pinout & Package
The SMA6F154A is housed in an industry-standard SMA (DO-214AC) flat package with two terminals: cathode (marked band) and anode. The package meets IPC7531 footprint guidelines and JEDEC registered outline, with matte tin lead finish compliant to J-STD-002 and JESD 22-B102 E3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts surge current to ground when Vline > VBR |
| Anode | Reference node | Typically tied to system ground or lower-potential rail; completes conduction path during clamping |
Key Features
| Feature | Design Value |
|---|---|
| High-temperature operation | Rated for continuous use up to Tj = 175 °C - eliminates derating in compact, thermally constrained layouts |
| Low dynamic resistance | RD = 10.2 Ω - reduces clamping voltage rise under high-current transients (e.g., lightning-induced surges) |
| Stable voltage temperature coefficient | αT = 10.8 × 10⁻⁴ /°C - ensures predictable VBR and VCL shift over full operating range |
| UL94 V0 flammability rating | Self-extinguishing epoxy body - satisfies safety compliance for enclosed industrial equipment |
Applications
| Automotive Power Rail Protection | Industrial PLC Input Protection |
|---|---|
Use Scenario: 12 V/24 V battery-fed ECUs exposed to load-dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power input and bulk capacitor to clamp transients before LDO or DC-DC regulator. Use Value: Withstands 400 W peak power at Tj = 175 °C and clamps ≤246 V at 1 A, preventing overvoltage damage to downstream PMICs. | Use Scenario: Analog input channels on programmable logic controllers interfacing with 4–20 mA sensors in factory-floor environments. IC Role / Device Role / Timing Role: Front-end transient suppressor on signal line, paired with series resistor and filter capacitor. Use Value: Low 0.2 µA leakage avoids measurement offset; 1 nF capacitance at 154 V preserves bandwidth for 10 kHz sensor signals. |
| Telecom DC Power Feeds | Smart Meter AC/DC Supply Protection |
Use Scenario: −48 V telecom rectifier outputs feeding base station RF modules. IC Role / Device Role / Timing Role: Primary surge protector on DC distribution bus, upstream of point-of-load converters. Use Value: 4 kW peak power rating (8/20 µs) handles IEC 61000-4-5 Combination Wave surges; UL94 V0 housing meets telecom safety standards. | Use Scenario: Mains-derived DC supply rails in revenue-grade electricity meters subject to fast transient bursts per IEC 61000-4-4. IC Role / Device Role / Timing Role: Secondary-level clamping device after MOV-based primary protection. Use Value: Precise 154 V VRM aligns with 120 VAC-derived 170 VDC rail; 10.8 × 10⁻⁴ /°C αT ensures stable clamping across −25 to +70 °C meter enclosure temperatures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA6F150A | 150 V VRM, VBR = 167–176 V, VCL = 243 V @ 1 A | Narrower voltage margin vs. 154 V nominal rail; slightly lower clamping | Select when tighter tolerance around 150 V systems is required and 3 V lower VRM is acceptable |
| 1.5SMC150A | 150 V VRM, same SMA package, but 1.5 kW (10/1000 µs) rating and higher leakage (1 µA @ 25 °C) | Higher power handling but reduced reliability in high-temp, low-leakage designs | Prefer only where surge energy exceeds 600 W and thermal derating is managed externally |
Compared with SMA6F150A and 1.5SMC150A, SMA6F154A provides optimal balance of 154 V system alignment, ultra-low leakage, and stable high-temperature clamping-critical for long-life industrial and automotive deployments where parameter drift must be minimized.
Availability
SMA6F154A is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLCs, telecom power feeds, and smart metering systems requiring stable component supply across extended temperature and surge stress conditions.
Supply support for SMA6F154A 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 microcontroller technologies for industrial, automotive, and consumer markets.
The SMA6F Transil series targets high-reliability transient suppression in demanding environments, emphasizing low leakage, high junction temperature capability, and planar process consistency for long-term parametric stability.
FAQ
What is the maximum clamping voltage of SMA6F154A under a 10/1000 µs surge?
The maximum clamping voltage is 246 V at 1 A for a 10/1000 µs waveform, measured at Tj = 25 °C. This value increases predictably with junction temperature using αT = 10.8 × 10⁻⁴ /°C, reaching ~262 V at Tj = 125 °C per the VCL(Tj) = VCL(25 °C) × [1 + αT(Tj − 25)] formula.
Is SMA6F154A suitable for bidirectional signal line protection?
No - SMA6F154A is strictly unidirectional and must be used with correct polarity: cathode toward the protected line, anode to reference ground. For bidirectional protection (e.g., USB, RS-485), a symmetric TVS like SMA6F154CA or dedicated dual-rail array is required.
How does the 10.2 Ω dynamic resistance affect circuit protection performance?
A dynamic resistance of 10.2 Ω directly determines voltage overshoot during surge events: ΔV = RD × IPP. At 12.6 A (8/20 µs), this contributes 129 V to clamping, making total VCL = 317 V. Lower RD would reduce overshoot but requires trade-offs in leakage and capacitance.
Can SMA6F154A be soldered using standard reflow profiles?
Yes - it complies with J-STD-020 MSL Level 1 and supports ST's recommended reflow profile: peak temperature 240–245 °C, ramp rate ≤3 °C/s, and time above 210 °C limited to 60–90 seconds. Matte tin plating ensures compatibility with Pb-free and SnPb processes.
SMA6F154A 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):
- 154V (Max)
- Voltage - Breakdown (Min):
- 171V
- Voltage - Clamping (Max) @ Ipp:
- 246V
- Current - Peak Pulse (10/1000µs):
- 2.4A
- 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
SMA6F154A FAQ
1.How can I place an order for SMA6F154A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA6F154A 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 SMA6F154A reliable?
The price and inventory of SMA6F154A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA6F154A is usually 5 days.
3.What payment methods are accepted for SMA6F154A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA6F154A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA6F154A?
SMA6F154A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA6F154A 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 SMA6F154A?
For technical support, including SMA6F154A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA6F154A requirements.
6.How does Aetrix verify that SMA6F154A is sourced from the original manufacturer or authorized distributors?
All SMA6F154A 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 SMA6F154A meets industry standards.
7.What is the process for return or replacement of SMA6F154A?
All SMA6F154A units undergo pre-shipment inspection (PSI). If there is an issue with SMA6F154A, 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 SMA6F154A part is unused and in its original packaging.
Return procedure for SMA6F154A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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