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Taiwan Semiconductor Corporation SMF15AH
- Part No.:
- SMF15AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- SOD-123W
- Datasheet:
-
SMF15AH.pdf
- Description:
- TVS DIODE 15VWM 24.4VC SOD123W
- Quantity:
- Payment:
- Shipping:
Inventory:19,990
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Product details
Overview
SMF15AH from Taiwan Semiconductor is a unidirectional transient voltage suppressor diode (TVS) designed for automotive-grade circuit protection. It features a 15 V working stand-off voltage (VWM), 16.7–18.5 V breakdown voltage (VBR), 24.4 V clamping voltage (VC) at 8.2 A peak pulse current, and 200 W peak pulse power (10/1000 µs). It is AEC-Q101 qualified and used to protect automotive lighting control modules against ISO 7637-2 pulses.
For engineers reviewing the SMF15AH datasheet, SMF15AH pinout, SMF15AH application, or SMF15AH equivalent, key selection criteria include clamping performance under 10/1000 µs transients, low leakage (<1 µA @ 15 V), SOD-123W package compatibility with automated placement, and compliance with automotive EFT and load-dump immunity standards.
Technical Context
The SMF15AH operates as a unidirectional avalanche diode, conducting only in reverse bias above its breakdown threshold to clamp transient overvoltages. Its glass-passivated junction ensures stable VBR tolerance and low leakage, while its thermal design supports 175 °C maximum junction temperature and 33 °C/W junction-to-lead resistance on standard PCB mounting.
It meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b waveforms-critical for automotive electronic control units-and delivers consistent clamping across -55 °C to +175 °C operating range without derating up to 125 °C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 15 V - Maximum continuous reverse operating voltage before clamping initiates |
| VBR min / max | 16.7 V / 18.5 V - Breakdown occurs within this range at 1 mA test current; defines turn-on threshold precision |
| VC @ IPPM | 24.4 V - Clamped voltage at 8.2 A peak pulse current; determines protected IC's maximum stress during transients |
| PPPM | 200 W - Peak pulse power handling capability with 10/1000 µs waveform; validates robustness against load dump |
| IR @ VWM | <1 µA - Reverse leakage at rated stand-off voltage; ensures minimal standby power loss in battery-sensitive systems |
| Package | SOD-123W - Surface-mount package with matte tin leads, J-STD-002 solderability, and UL 94V-0 molding compound |
| TJ max | 175 °C - Maximum junction temperature; enables operation in under-hood automotive environments |
Pinout & Package
SOD-123W package: surface-mount, single-diode configuration, cathode indicated by band. Dimensions per Taiwan Semiconductor drawing: length 2.7 mm, width 1.6 mm, height 1.1 mm; weight ≈ 0.016 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to system ground or lower-potential rail in unidirectional TVS configuration |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., CAN_H, LIN, or 12 V supply rail); conducts when transient exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive use including temperature cycling, HTRB, and mechanical shock per JESD47 |
| Glass-passivated junction | Ensures stable VBR over lifetime and reduces parameter drift under humidity and thermal stress |
| ISO 7637-2 compliance | Guarantees immunity to standardized automotive transients (Pulse 1/2a/2b/3a/3b) without external filtering |
| Low IR <1 µA @ VWM | Minimizes quiescent current draw in always-on vehicle networks (e.g., body control modules) |
| Moisture sensitivity level 1 | Enables direct placement without baking; compatible with standard SMT reflow profiles per J-STD-020 |
Applications
| Automotive Lighting Control | Body Control Module (BCM) Power Input |
|---|---|
Use Scenario: Protecting LED driver ICs from load-dump transients during alternator regulation faults. IC Role / Device Role / Timing Role: Unidirectional TVS clamping 12 V supply rail to limit voltage excursion to ≤24.4 V during 10/1000 µs pulses. Use Value: Prevents latch-up or gate oxide damage in buck controllers and MOSFET drivers exposed to >100 V spikes. | Use Scenario: Safeguarding microcontroller power inputs against EFT bursts induced by relay switching in door lock actuators. IC Role / Device Role / Timing Role: Fast-response clamping element absorbing 200 W pulses while maintaining <1 µA leakage at 15 V nominal rail. Use Value: Eliminates need for additional RC filters or varistors, reducing BOM count and board space in compact BCM designs. |
| Infotainment System USB Port | Engine Control Unit (ECU) Sensor Interface |
Use Scenario: ESD protection for USB VBUS line subjected to ±15 kV contact discharge per IEC 61000-4-2. IC Role / Device Role / Timing Role: Low-capacitance TVS (typ. <100 pF) placed directly at connector to shunt fast transients before reaching USB PHY. Use Value: Maintains signal integrity for USB 2.0 data rates while meeting automotive EMC requirements without degrading rise/fall times. | Use Scenario: Protecting analog sensor inputs (e.g., MAP, TPS) from inductive kickback generated by nearby solenoid drivers. IC Role / Device Role / Timing Role: Standoff-rated clamping device with 15 V VWM ensures no interference during normal 5 V sensor output operation. Use Value: Preserves ADC accuracy by preventing input-stage saturation during sub-µs transients, avoiding measurement corruption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ15A | Same VWM (15 V), but higher VC (24.4 V → 27.7 V), lower PPPM (400 W → 200 W), SMA package (larger footprint) | Less effective clamping margin for sensitive 3.3 V logic rails; requires larger PCB area | Choose SMAJ15A only if higher surge rating is needed and SOD-123W size constraint does not apply |
| TPSMA6L15A | Same VWM and VC, but AEC-Q101 not claimed; TJ max = 150 °C vs. 175 °C; tighter VBR tolerance (±5% vs. ±5.5%) | Not validated for under-hood high-temp operation; suitable for cabin modules only | Select TPSMA6L15A for cost-sensitive non-under-hood applications where full AEC-Q101 is not mandated |
Compared with SMAJ15A and TPSMA6L15A, the SMF15AH provides superior thermal robustness (175 °C TJ max), optimal clamping voltage for 12 V systems, and guaranteed AEC-Q101 qualification-making it the preferred choice for engine bay and lighting control applications requiring long-term reliability.
Availability
SMF15AH is available at Aetrix Electronics and suitable for automotive lighting control, body control module (BCM) power input, infotainment USB port protection, and engine control unit (ECU) sensor interface applications requiring stable component supply and AEC-Q101 compliance.
Supply support for SMF15AH 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 semiconductor manufacturer specializing in discrete power devices, TVS diodes, and rectifiers with global automotive and industrial certifications.
The SMF series was developed specifically for AEC-Q101-compliant transient suppression in 12 V and 24 V automotive subsystems, emphasizing low-leakage, precise clamping, and high-temperature reliability in compact SOD-123W packaging.
FAQ
What is the clamping voltage of SMF15AH and how is it measured?
The SMF15AH has a maximum clamping voltage (VC) of 24.4 V, measured at 8.2 A peak pulse current with a 10/1000 µs waveform per IEC 61000-4-5. This value is specified in the Electrical Specifications table and reflects worst-case voltage seen by downstream circuitry during standardized surge events. The SMF15AH maintains this clamping performance across its full operating temperature range.
Is SMF15AH suitable for bidirectional transient protection?
No, SMF15AH is a unidirectional TVS diode and is not rated for bidirectional operation. Its electrical specifications-including breakdown voltage, clamping behavior, and leakage-are defined only for reverse-bias conduction. For AC or dual-polarity signal lines, a dedicated bidirectional part such as SMF15AY must be selected instead of SMF15AH.
Does SMF15AH meet ISO 7637-2 Pulse 5a (load dump)?
No, SMF15AH is rated for ISO 7637-2 Pulses 1, 2a, 2b, 3a, and 3b only-not Pulse 5a (load dump), which requires higher energy handling. Pulse 5a testing demands devices with ≥350 W PPPM and specialized construction; SMF15AH's 200 W rating and 24.4 V VC make it unsuitable for direct load-dump suppression without supplemental protection stages.
What is the marking code for SMF15AH and how is it decoded?
The SMF15AH is marked "2W015" on the device body. Per Taiwan Semiconductor's ordering information, "2W" denotes the SMF series, "015" indicates the 15 V stand-off voltage, and the absence of suffix letters confirms standard unidirectional configuration. This marking appears adjacent to the cathode band on the SOD-123W package.
Can SMF15AH be used in DC-DC converter input protection?
Yes, SMF15AH is commonly used to protect DC-DC converter inputs from line transients in automotive 12 V systems. Its 15 V VWM aligns with nominal input ranges, and its 24.4 V VC ensures the converter's absolute maximum input rating (typically 28–36 V) is not exceeded. Designers must verify layout parasitics and ensure adequate PCB copper area for thermal dissipation during repeated surges.
SMF15AH 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):
- 15V
- Voltage - Breakdown (Min):
- 16.7V
- Voltage - Clamping (Max) @ Ipp:
- 24.4V
- Current - Peak Pulse (10/1000µs):
- 8.2A
- Power - Peak Pulse:
- 200W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123W
SMF15AH FAQ
1.How can I place an order for SMF15AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF15AH 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 SMF15AH reliable?
The price and inventory of SMF15AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF15AH is usually 5 days.
3.What payment methods are accepted for SMF15AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF15AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF15AH?
SMF15AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF15AH 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 SMF15AH?
For technical support, including SMF15AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF15AH requirements.
6.How does Aetrix verify that SMF15AH is sourced from the original manufacturer or authorized distributors?
All SMF15AH 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 SMF15AH meets industry standards.
7.What is the process for return or replacement of SMF15AH?
All SMF15AH units undergo pre-shipment inspection (PSI). If there is an issue with SMF15AH, 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 SMF15AH part is unused and in its original packaging.
Return procedure for SMF15AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMF15AH Tags
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