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Taiwan Semiconductor Corporation SMF5.0A
- Part No.:
- SMF5.0A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- SOD-123W
- Datasheet:
-
SMF5.0A.pdf
- Description:
- TVS DIODE 5VWM 9.2VC SOD123W
- Quantity:
- Payment:
- Shipping:
Inventory:18,618
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Product details
Overview
SMF5.0A from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for high-energy ESD and surge protection in low-voltage DC circuits. It features a 5.0 V working stand-off voltage (VWM), 6.4–7.0 V breakdown voltage (VBR), 21.7 V clamping voltage at 800 A peak pulse current, and 200 W peak pulse power rating with 10/1000 µs waveform - ideal for protecting USB ports, microcontroller I/O lines, and automotive body electronics.
For engineers reviewing the SMF5.0A datasheet, SMF5.0A pinout, SMF5.0A application, or SMF5.0A equivalent, key selection criteria include clamping performance under 800 A transients, sub-1 µA reverse leakage above 10 V, SOD-123W package compatibility with automated assembly, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, and thermal resistance (RθJL = 33 °C/W) for PCB-constrained thermal design.
Technical Context
The SMF5.0A operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its 6.4–7.0 V breakdown threshold. Its glass-passivated junction ensures stable VBR tolerance and low leakage (<5 µA at VWM = 5.0 V), while the SOD-123W package supports high-current pulse handling via optimized leadframe thermal path (RθJL = 33 °C/W).
It delivers precise transient suppression with a clamping voltage of 21.7 V at 800 A (10/1000 µs), limiting downstream voltage stress during fast-rising surges. The device meets automotive-grade immunity standards including ISO 7637-2 Pulse 1 (inductive load dump), Pulse 2a (battery disconnect), and Pulse 3a/3b (capacitive coupling), making it suitable for 12 V system interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 5.0 V - Maximum continuous reverse operating voltage before conduction begins; sets safe margin below 5 V logic/system rails. |
| VBR @ IT = 10 mA | 6.4–7.0 V - Measured breakdown range confirms reliable turn-on within 14% tolerance for consistent surge response. |
| VC @ IPPM = 800 A | 21.7 V - Clamped voltage during worst-case 10/1000 µs surge; limits protected IC voltage stress to ≤21.7 V. |
| PPPM | 200 W - Peak pulse power handling capability per 10/1000 µs waveform; enables robust protection against EFT and load dump. |
| IR @ VWM | <5 µA - Reverse leakage at rated stand-off voltage; ensures negligible standby power loss and signal integrity in high-impedance nodes. |
| Package | SOD-123W - Surface-mount outline with enhanced thermal pad and 0.016 g mass; supports automated placement and 10,000 pcs/reel packaging. |
| TJ max | +175 °C - Maximum junction temperature; allows operation in under-hood automotive environments and industrial enclosures. |
Pinout & Package
SMF5.0A uses the SOD-123W package: a compact, surface-mount, single-diode outline with cathode band marking polarity. The case is molded with UL 94V-0 compliant compound, matte tin-plated leads meet J-STD-002 solderability, and weight is 0.016 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Surge return path | Connected to ground or low-impedance return plane; carries full transient current during clamping. |
| Cathode | Protected line connection | Connected to the line being protected (e.g., USB D+, CAN_H); conducts avalanche current when voltage exceeds VBR. |
| Cathode band | Polarity indicator | Visible marking on package body; ensures correct orientation during placement to avoid reverse-bias failure mode. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR over temperature and lifetime, with <5 µA IR at VWM - critical for battery-powered sensor nodes. |
| 200 W peak pulse power (10/1000 µs) | Handles automotive load dump and ISO 7637-2 Pulse 1 surges without degradation - validated up to 800 A peak current. |
| RθJL = 33 °C/W | Enables efficient heat transfer from junction to PCB copper pad, supporting sustained operation at +125 °C ambient in enclosed modules. |
| Moisture sensitivity level 1 | Eliminates bake requirements prior to reflow; compatible with standard SMT processes without floor-life constraints. |
| RoHS & halogen-free | Complies with IEC 61249-2-21 and EU RoHS directives - required for automotive and industrial OEM supply chains. |
Applications
| USB 2.0 Data Line Protection | Automotive Body Control Module (BCM) Inputs |
|---|---|
Use Scenario: Protecting USB D+ and D− lines from ESD events (>8 kV contact) and cable-induced surges in portable docking stations. IC Role / Device Role: Unidirectional TVS clamp placed between connector and USB transceiver IC. Use Value: Limits clamped voltage to 21.7 V during 800 A transients, preserving signal integrity and preventing damage to 3.3 V tolerant PHYs. | Use Scenario: Safeguarding 5 V sensor inputs (e.g., door latch, seat position) in BCMs exposed to ISO 7637-2 Pulse 3b noise. IC Role / Device Role: Standoff protection element on low-side switch inputs subjected to capacitive coupling transients. Use Value: Sub-5 µA leakage at 5.0 V ensures no measurable offset error in precision analog sensing paths. |
| Industrial PLC Digital Input Protection | Smart Lighting Driver Control Lines |
Use Scenario: Shielding 24 V DC digital input channels from inductive kickback when solenoids or relays de-energize. IC Role / Device Role: Transient shunt across optocoupler input or Schmitt trigger input stage. Use Value: 200 W pulse rating sustains repeated 10/1000 µs surges without parameter drift - verified per JEDEC JESD22-A114E. | Use Scenario: Guarding DALI or 0–10 V dimming control lines in LED drivers against EFT bursts in commercial buildings. IC Role / Device Role: Low-capacitance (typ. 120 pF @ 1 MHz) unidirectional clamp on bidirectional control bus. Use Value: 6.4–7.0 V VBR aligns with 5 V logic thresholds, enabling clean turn-on without false triggering during normal operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ5.0A | Higher VBR (6.7–7.4 V), same VWM (5.0 V), larger SMB package (RθJA = 50 °C/W vs. 100 °C/W for SMF5.0A) | Better suited for higher-power board-level protection where space permits; less optimal for dense USB layouts | Select SMBJ5.0A only if PCB layout allows SMB footprint and thermal budget exceeds 50 °C/W ambient rise |
| P6SMB5.0A | Same VWM/VBR specs, but 600 W PPPM rating and DO-214AA package; RθJA = 40 °C/W | Designed for primary-level surge suppression (e.g., front-end AC/DC inputs), not signal-line protection | Use P6SMB5.0A for bulk input protection; SMF5.0A remains preferred for secondary-side, low-capacitance, space-constrained I/O protection |
Compared with SMBJ5.0A and P6SMB5.0A, the SMF5.0A offers superior board density and lower thermal resistance to lead (33 °C/W), making it optimal for fine-pitch, high-reliability signal-line protection where SOD-123W footprint and automated assembly are mandatory.
Availability
SMF5.0A is available at Aetrix Electronics and suitable for USB interface protection, automotive body electronics, industrial PLC digital inputs, and smart lighting control systems requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMF5.0A 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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated Taiwanese semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs for automotive, industrial, and consumer markets.
The SMF5.0A belongs to TSC's SMF series of surface-mount TVS diodes, engineered specifically for high-reliability, low-leakage transient suppression in space-constrained 5–100 V DC systems - with emphasis on ISO 7637-2 compliance and automated manufacturing readiness.
FAQ
What is the maximum clamping voltage of the SMF5.0A at its rated peak pulse current?
The SMF5.0A has a maximum clamping voltage (VC) of 21.7 V when subjected to an 800 A peak pulse current with a 10/1000 µs waveform. This value is measured per JEDEC standards and ensures downstream components experience no more than 21.7 V during worst-case surge events. The SMF5.0A maintains this clamping performance consistently across its specified operating temperature range of –55 °C to +175 °C.
Is the SMF5.0A suitable for protecting 3.3 V logic interfaces?
No - the SMF5.0A is not recommended for direct protection of 3.3 V logic interfaces because its 5.0 V working stand-off voltage (VWM) provides insufficient margin above 3.3 V rail levels, risking premature conduction during normal operation. For 3.3 V systems, a TVS such as SMF3.3A (VWM = 3.3 V, VBR = 4.0–4.4 V) should be used instead. The SMF5.0A is optimized for 5 V nominal circuits like USB 2.0, microcontroller GPIOs, and automotive 5 V sensor inputs.
Does the SMF5.0A meet automotive transient immunity standards?
Yes, the SMF5.0A meets ISO 7637-2 Pulse 1 (inductive load dump), Pulse 2a (battery disconnection), Pulse 2b (alternator load dump), and Pulse 3a/3b (capacitive coupling) requirements. Its 200 W peak pulse power rating, 21.7 V clamping voltage, and low leakage (<5 µA at 5.0 V) make it suitable for use in automotive body electronics, infotainment interfaces, and BCM subsystems where robust EMC immunity is mandated.
What is the thermal resistance from junction to lead (RθJL) for the SMF5.0A?
The SMF5.0A has a typical junction-to-lead thermal resistance (RθJL) of 33 °C/W when mounted on a 5 mm × 5 mm copper pad per JESD51-3. This low value enables effective heat dissipation during repetitive surge events and supports reliable operation in thermally constrained environments such as sealed automotive ECUs or compact IoT gateways where airflow is limited.
Can the SMF5.0A be used in bidirectional signal lines like RS-485 or CAN?
No - the SMF5.0A is a unidirectional TVS diode and is not suitable for bidirectional differential buses like RS-485 or CAN. It conducts only in reverse bias above VBR and lacks symmetrical clamping in both polarities. For such applications, a bidirectional TVS such as SMAJ5.0CA or SMCJ5.0CA must be selected. The SMF5.0A is intended exclusively for unidirectional protection of single-ended 5 V lines like USB D+, I²C SDA, or microcontroller reset inputs.
SMF5.0A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- SOD-123W
- Series:
- SMF
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 5V
- Voltage - Breakdown (Min):
- 6.4V
- Voltage - Clamping (Max) @ Ipp:
- 9.2V
- Current - Peak Pulse (10/1000µs):
- 21.7A
- Power - Peak Pulse:
- 200W
- 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:
- SOD-123W
SMF5.0A FAQ
1.How can I place an order for SMF5.0A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF5.0A 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 SMF5.0A reliable?
The price and inventory of SMF5.0A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF5.0A is usually 5 days.
3.What payment methods are accepted for SMF5.0A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF5.0A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF5.0A?
SMF5.0A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF5.0A 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 SMF5.0A?
For technical support, including SMF5.0A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF5.0A requirements.
6.How does Aetrix verify that SMF5.0A is sourced from the original manufacturer or authorized distributors?
All SMF5.0A 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 SMF5.0A meets industry standards.
7.What is the process for return or replacement of SMF5.0A?
All SMF5.0A units undergo pre-shipment inspection (PSI). If there is an issue with SMF5.0A, 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 SMF5.0A part is unused and in its original packaging.
Return procedure for SMF5.0A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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