My Inquiry
My Account
STMicroelectronics SMA4F154A
;;2.jpg)
- Part No.:
- SMA4F154A
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-221AC, SMA Flat Leads
- Datasheet:
-
SMA4F154A.pdf
- Description:
- TVS DIODE 154VWM 246VC SMAFLAT
- Quantity:
- Payment:
- Shipping:
Inventory:9,979
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMA4F154A from STMicroelectronics is a unidirectional 400 W transient voltage suppression (TVS) diode designed for primary-level surge protection in DC power lines and signal interfaces. It features a 154 V stand-off voltage (VRM), 189 V maximum breakdown voltage (VBR max), 246 V clamping voltage (VCL) at 1 A, 1.6 Ω dynamic resistance, and operates up to 175 °C junction temperature - enabling robust protection in industrial power supplies and telecom infrastructure.
For engineers reviewing the SMA4F154A datasheet, SMA4F154A pinout, SMA4F154A application, or SMA4F154A 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 SMA4F154A uses planar silicon avalanche technology to deliver precise, repeatable clamping response 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 (1.6 Ω) ensures minimal voltage overshoot under 1 A peak pulse current.
Thermal design is enabled by a 175 °C maximum junction temperature rating 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 (±25 kV contact / ±30 kV air discharge) and complies with J-STD-020 MSL Level 1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRM) | 154 V - Maximum continuous reverse operating voltage before significant leakage begins. |
| Breakdown Voltage (VBR) | 171–189 V @ 1 mA - Confirmed avalanche onset range ensuring predictable turn-on during overvoltage events. |
| Clamping Voltage (VCL) | 246 V @ 1 A (10/1000 µs) - Limits downstream circuit voltage during surge, protecting 200 V-rated components. |
| Peak Pulse Power | 400 W (10/1000 µs) - Sustains industrial-grade surge energy without degradation at 25 °C ambient. |
| Dynamic Resistance (RD) | 1.6 Ω - Low impedance maintains tight clamping margin across varying surge currents. |
| Leakage Current (IRM) | 0.2 µA @ 25 °C, 1 µA @ 85 °C - Enables use in high-impedance sensing and low-power standby circuits. |
| Junction Temperature Range | −55 to +175 °C - Supports operation in enclosed industrial enclosures and outdoor telecom cabinets. |
Pinout & Package
The SMA4F154A is housed in an industry-standard SMA (DO-214AC) flat package with two terminals: Cathode (marked end) and Anode. The matte tin-plated leads comply with JESD 22-B102 E3 and support lead-free reflow per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (marked band) | Surge current sink | Connected to protected line; conducts transient current to ground when VRM exceeded. |
| Anode | Reference node | Tied to system ground or common return path; completes clamping loop during avalanche conduction. |
Key Features
| Feature | Design Value |
|---|---|
| High-temperature surge capability | 200 W clamping power retained at Tj = 175 °C - enables reliable operation in thermally constrained enclosures. |
| Low-leakage planar junction | 0.2 µA @ 25 °C - minimizes standby power loss and avoids false triggering in precision analog inputs. |
| IEC 61000-4-2 Level 4 compliance | ±25 kV contact / ±30 kV air discharge - exceeds industrial immunity requirements without external filtering. |
| IPC7531 & JEDEC-compliant footprint | Validated 5.0 × 2.9 mm pad layout - ensures manufacturability and thermal reliability on standard FR4 PCBs. |
Applications
| Industrial Power Supply Input Protection | Telecom Line Card Surge Suppression |
|---|---|
Use Scenario: 48 V DC input stage of DIN-rail mounted PLC power module exposed to load dump and inductive switching transients. IC Role / Device Role / Timing Role: Primary unidirectional TVS clamp placed upstream of DC-DC converter input filter. Use Value: Clamps 400 W surges to ≤246 V, preventing damage to 200 V-rated electrolytic capacitors and MOSFET gate drivers. | Use Scenario: -48 V bias rail on Ethernet-over-copper line card handling PoE+ and lightning-induced longitudinal surges. IC Role / Device Role / Timing Role: Standoff-rated TVS on feed line between isolation transformer and DC-DC regulator. Use Value: Maintains <0.2 µA leakage at 48 V, avoiding interference with differential signaling while clamping 30 kV air discharges. |
| Automotive Body Control Module (BCM) Power Rail | Smart Meter AC/DC Auxiliary Supply |
Use Scenario: 12 V battery-supplied BCM subsystem subject to ISO 7637-2 Pulse 1 (−150 V) and Pulse 3a (±100 V). IC Role / Device Role / Timing Role: Secondary TVS after LC filter, providing fast-response clamping for microcontroller power domain. Use Value: 175 °C junction rating allows placement near heat-generating CAN transceivers without derating. | Use Scenario: 230 V AC-derived auxiliary supply in utility smart meter with long-term field deployment. IC Role / Device Role / Timing Role: Standoff-rated TVS on rectified DC bus before linear regulator input. Use Value: 1.6 Ω RD ensures sub-250 V clamping during 10/1000 µs surges, preserving 250 V-rated bulk capacitor lifetime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ150A | 150 V VRM, 243 V VCL @ 1 A, 1.5 Ω RD, same SMA package | Lower stand-off voltage limits use in 150 V systems only; identical thermal and surge ratings | Select when exact 150 V standoff is required and 154 V margin is unnecessary. |
| SMBJ150A | 150 V VRM, 243 V VCL @ 1 A, but SMB package (higher thermal resistance) | Reduced power handling above 100 °C due to larger package thermal impedance | Choose only if board space permits SMB footprint and thermal derating is acceptable. |
Compared with SMAJ150A and SMBJ150A, the SMA4F154A provides higher stand-off voltage (154 V vs. 150 V) and superior high-temperature clamping stability - critical for designs requiring margin against aging-related voltage drift or elevated ambient conditions.
Availability
SMA4F154A is available at Aetrix Electronics and suitable for industrial power supplies, telecom line cards, automotive body control modules, and smart meter auxiliary supplies requiring stable component supply across multi-year production cycles.
Supply support for SMA4F154A 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, specializing in power management, protection devices, and automotive-grade ICs with broad industrial certification coverage.
The SMA4F series belongs to ST's Transil™ TVS portfolio, engineered specifically for high-reliability, high-temperature surge protection in harsh-environment power and interface circuits - not general-purpose ESD suppression.
FAQ
What is the maximum clamping voltage of SMA4F154A under a 10/1000 µs surge?
The maximum clamping voltage is 246 V at 1 A peak pulse current (IPP = 1 A) for a 10/1000 µs waveform, measured at 25 °C ambient. This value increases with junction temperature per the αT coefficient (10.8 × 10⁻⁴ /°C), reaching ~265 V at 175 °C.
Can SMA4F154A be used in bidirectional signal lines?
No - SMA4F154A is a unidirectional TVS diode intended for DC-biased lines like power rails or single-ended data buses. For bidirectional protection (e.g., RS-485, USB), a symmetrical device such as SMA4F154AY (if offered) or discrete back-to-back configuration is required.
Does SMA4F154A meet automotive AEC-Q200 stress testing requirements?
No - SMA4F154A is qualified to industrial standards (J-STD-020 MSL 1, JESD22-B102 E3) but is not AEC-Q200 qualified. For automotive applications, ST recommends the Automotive-grade SMA6J150A or SMA6J150CA series, which undergo full temperature cycling, humidity, and vibration validation.
What is the recommended PCB footprint for SMA4F154A?
The recommended footprint follows IPC7531 and JEDEC DO-214AC outlines: 5.00–5.35 mm length (E), 2.25–2.90 mm width (D), with 3.95–4.60 mm cathode/anode pad spacing (E1). Copper area ≥2 cm² per pad improves thermal dissipation and surge endurance.
SMA4F154A 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):
- 154V (Max)
- Voltage - Breakdown (Min):
- 171V
- Voltage - Clamping (Max) @ Ipp:
- 246V
- Current - Peak Pulse (10/1000µs):
- 1.6A
- 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
SMA4F154A FAQ
1.How can I place an order for SMA4F154A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA4F154A 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 SMA4F154A reliable?
The price and inventory of SMA4F154A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA4F154A is usually 5 days.
3.What payment methods are accepted for SMA4F154A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA4F154A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA4F154A?
SMA4F154A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA4F154A 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 SMA4F154A?
For technical support, including SMA4F154A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA4F154A requirements.
6.How does Aetrix verify that SMA4F154A is sourced from the original manufacturer or authorized distributors?
All SMA4F154A 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 SMA4F154A meets industry standards.
7.What is the process for return or replacement of SMA4F154A?
All SMA4F154A units undergo pre-shipment inspection (PSI). If there is an issue with SMA4F154A, 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 SMA4F154A part is unused and in its original packaging.
Return procedure for SMA4F154A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMA4F154A Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
