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Taiwan Semiconductor Corporation SMF100A
- Part No.:
- SMF100A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- SOD-123W
- Datasheet:
-
SMF100A.pdf
- Description:
- TVS DIODE 100VWM 162VC SOD123W
- Quantity:
- Payment:
- Shipping:
Inventory:7,664
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Product details
Overview
SMF100A from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for high-energy surge protection in DC power lines and signal paths. It features a 100 V working stand-off voltage (VWM), 111–123 V breakdown voltage (VBR), 162 V clamping voltage (VC) at 1.08 A peak pulse current, and 200 W peak pulse power (10/1000 µs waveform). It is used in automotive ECU power rail protection against ISO 7637-2 pulses.
For engineers reviewing the SMF100A datasheet, SMF100A pinout, SMF100A application, or SMF100A equivalent, key selection criteria include clamping performance under 10/1000 µs transients, low leakage (<1 µA @ 100 V), SOD-123W package compatibility with automated assembly, and compliance with ISO 7637-2 Pulse 1/2a/2b/3a/3b immunity requirements.
Technical Context
The SMF100A operates as a unidirectional avalanche diode, activated when reverse voltage exceeds its breakdown threshold (111–123 V), diverting surge current to ground while clamping the protected line to ≤162 V. Its glass-passivated junction ensures stable breakdown characteristics and low leakage.
Thermal design relies on its SOD-123W package with RθJL = 33 °C/W and RθJA = 100 °C/W (on 5 mm × 5 mm Cu pad), enabling reliable operation up to TJ = 175 °C. It meets JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 100 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 111 / 123 V @ 1 mA - Confirmed avalanche onset range for reliable overvoltage triggering |
| VC @ IPPM | 162 V @ 1.08 A (10/1000 µs) - Clamped voltage during worst-case surge, limiting stress on downstream ICs |
| PPPM | 200 W (10/1000 µs) - Peak surge energy handling capacity per IEC 61000-4-5 and ISO 7637-2 |
| IR @ VWM | <1 µA - Negligible leakage at rated stand-off, preserving low-power circuit integrity |
| TJ max | +175 °C - Enables use in under-hood automotive environments without derating |
| Package | SOD-123W - Standardized surface-mount outline with matte tin leads, compatible with reflow and wave soldering |
Pinout & Package
SOD-123W is a two-terminal, single-die surface-mount package with cathode band marking polarity. Dimensions comply with JEDEC standard outlines; terminals are matte tin-plated and solderable per J-STD-002.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference node | Connected to system ground or return path; forms current sink during clamping |
| Cathode | Protected line input | Connected to supply rail or signal line; voltage referenced to anode during transient suppression |
Key Features
| Feature | Design Value |
|---|---|
| Photo glass-passivated junction | Ensures consistent VBR tolerance and long-term stability under thermal cycling and humidity |
| Clamping ratio VC/VBR | 1.45 (162 V / 111 V) - Low ratio indicates efficient energy diversion with minimal overvoltage overshoot |
| ISO 7637-2 compliance | Validated for Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling) - directly supports automotive EMC certification |
| Moisture sensitivity level | Level 1 (J-STD-020) - No bake requirement prior to reflow, reducing manufacturing overhead |
| Halogen-free construction | Complies with IEC 61249-2-21 - meets environmental compliance for RoHS and ELV directives |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V/24 V battery-fed ECUs from load dump and alternator transients per ISO 7637-2. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and ground to clamp surges before they reach PMICs or microcontrollers. Use Value: Limits peak voltage to 162 V during 10/1000 µs pulses, preventing latch-up or gate oxide damage in downstream silicon. | Use Scenario: Safeguarding analog sensor inputs (e.g., pressure, temperature) in PLC modules exposed to EFT bursts. IC Role / Device Role / Timing Role: Low-capacitance TVS shunting fast transients (<100 ns rise time) on signal lines without distorting millivolt-level outputs. Use Value: IR <1 µA at 100 V ensures no DC loading of high-impedance sensor bridges or amplifier inputs. |
| LED Driver Supply Protection | DC Motor Control Board Protection |
Use Scenario: Shielding constant-current LED drivers from inductive kickback when switching high-brightness arrays. IC Role / Device Role / Timing Role: TVS connected across driver output to absorb back-EMF spikes generated during MOSFET turn-off. Use Value: 200 W peak power rating handles repetitive 10/1000 µs surges common in PWM-driven lighting systems. | Use Scenario: Suppressing voltage spikes on H-bridge power rails caused by brushed DC motor commutation noise. IC Role / Device Role / Timing Role: Bidirectional protection not required; unidirectional SMF100A placed on positive rail to clamp positive-going transients only. Use Value: Cathode-band polarity enables correct orientation in high-side switch configurations without reverse conduction risk. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ100A (Bourns) | Same VWM (100 V), higher PPPM (600 W), larger SMB package (4.5 × 3.9 mm vs. SOD-123W 2.7 × 1.6 mm) | Preferred where higher surge margin is needed and board space allows larger footprint | Select SMBJ100A if system-level testing requires >200 W surge headroom; otherwise SMF100A offers better density and cost. |
| P6SMB100A (ON Semiconductor) | Identical VWM (100 V), same SOD-123W package, but higher VC (165 V) and lower IR spec (≤5 µA vs. <1 µA) | Suitable for less sensitive circuits where tighter leakage control is not critical | Choose P6SMB100A only if legacy BOM alignment or dual-sourcing mandates ON Semi; SMF100A provides superior leakage and clamping precision. |
Compared with SMBJ100A and P6SMB100A, the SMF100A delivers optimal balance of compact SOD-123W footprint, sub-1 µA leakage, and verified ISO 7637-2 compliance-making it preferred for space-constrained automotive and industrial PCBs requiring precise clamping and low standby loss.
Availability
SMF100A is available at Aetrix Electronics and suitable for automotive ECU power rail protection, industrial sensor interface hardening, and LED driver surge suppression requiring stable component supply and full traceability.
Supply support for SMF100A 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 SMF series was developed specifically for AEC-Q101-compliant transient suppression in harsh-environment electronics, emphasizing reliability, tight parametric distribution, and seamless integration into automated SMT lines.
FAQ
What is the maximum clamping voltage of the SMF100A under a 10/1000 µs surge?
The SMF100A has a maximum clamping voltage (VC) of 162 V when subjected to its rated peak pulse current of 1.08 A with a 10/1000 µs waveform. This value is measured per standard test conditions (TA = 25°C) and defines the upper voltage limit imposed on the protected circuit during transient events. Designers use this parameter to verify that downstream components remain within their absolute maximum ratings during surge conditions. The SMF100A's clamping performance is validated across its full operating temperature range.
Is the SMF100A suitable for ISO 7637-2 Pulse 5a (load dump) protection?
No-the SMF100A is rated for ISO 7637-2 Pulses 1, 2a, 2b, 3a, and 3b, but not Pulse 5a (load dump), which requires much higher energy handling (up to 1000 W). Pulse 5a demands devices like SMAJ100A or specialized load-dump suppressors. The SMF100A's 200 W PPPM rating is insufficient for Pulse 5a's long-duration, high-energy profile. For full vehicle-level EMC, SMF100A should be paired with a dedicated load-dump protector upstream. Always confirm test configuration using the official SMF100A datasheet.
Does the SMF100A have a bidirectional variant?
No-the SMF100A is strictly unidirectional. Its marking code "2W100" and cathode-band polarity indicate anode-to-cathode conduction only in reverse bias. Taiwan Semiconductor offers separate bidirectional parts (e.g., SMF100CA) for AC or dual-polarity protection needs. Substituting SMF100A in a bidirectional application will result in forward conduction during negative transients and potential failure. Always match device polarity to system signal architecture-SMF100A is intended for DC rail protection with defined ground reference.
What is the thermal resistance from junction to lead (RθJL) for the SMF100A?
The SMF100A has a typical junction-to-lead thermal resistance (RθJL) of 33 °C/W when mounted on a standard 5 mm × 5 mm copper pad per JEDEC test conditions. This value enables accurate thermal modeling of power dissipation during repetitive surge events. Combined with its 175 °C maximum junction temperature, RθJL supports sustained operation in ambient temperatures up to 125 °C when PCB layout adheres to recommended pad dimensions. Derating curves in the SMF100A datasheet must be consulted for elevated ambient conditions.
Can the SMF100A be used in place of the SMF85A for higher voltage margin?
Yes-replacing SMF85A (VWM = 85 V) with SMF100A (VWM = 100 V) increases stand-off margin and reduces leakage, but requires verifying that the protected circuit's maximum steady-state voltage does not exceed 100 V. The SMF100A's higher VBR (111–123 V) delays clamping onset, which may allow larger transients to pass before activation. System-level testing is essential to confirm immunity improvement. Also note: SMF100A's clamping voltage (162 V) is higher than SMF85A's (137 V), so downstream ICs must tolerate the increased clamped level.
SMF100A 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):
- 100V
- Voltage - Breakdown (Min):
- 111V
- Voltage - Clamping (Max) @ Ipp:
- 162V
- Current - Peak Pulse (10/1000µs):
- -
- 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
SMF100A FAQ
1.How can I place an order for SMF100A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF100A 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 SMF100A reliable?
The price and inventory of SMF100A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF100A is usually 5 days.
3.What payment methods are accepted for SMF100A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF100A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF100A?
SMF100A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF100A 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 SMF100A?
For technical support, including SMF100A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF100A requirements.
6.How does Aetrix verify that SMF100A is sourced from the original manufacturer or authorized distributors?
All SMF100A 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 SMF100A meets industry standards.
7.What is the process for return or replacement of SMF100A?
All SMF100A units undergo pre-shipment inspection (PSI). If there is an issue with SMF100A, 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 SMF100A part is unused and in its original packaging.
Return procedure for SMF100A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF100A Tags
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