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Taiwan Semiconductor Corporation SMF26AH
- Part No.:
- SMF26AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- SOD-123W
- Datasheet:
-
SMF26AH.pdf
- Description:
- TVS DIODE 26VWM 42.1VC SOD123W
- Quantity:
- Payment:
- Shipping:
Inventory:19,643
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Product details
Overview
SMF26AH from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SOD-123W package, rated for 26 V working stand-off voltage, 28.9–31.9 V breakdown voltage at 1 mA, 42.1 V clamping voltage at 4.8 A peak pulse current, and 200 W peak pulse power (10/1000 µs). It protects automotive and industrial control circuits against ESD, load dump, and ISO 7637-2 transients.
For engineers reviewing the SMF26AH datasheet, SMF26AH pinout, SMF26AH application, or SMF26AH equivalent, key selection criteria include clamping performance under 10/1000 µs surge, AEC-Q101 qualification for automotive use, low leakage (<1 µA @ 26 V), SOD-123W footprint compatibility, and thermal resistance (RθJL = 33 °C/W) for PCB-level thermal management.
Technical Context
The SMF26AH operates as a unidirectional avalanche diode with glass-passivated junction, designed to clamp transient overvoltages before they damage downstream ICs or sensors. Its 26 V VWM ensures stable operation under nominal 24 V automotive supply rails while maintaining margin against ripple and tolerance drift.
It meets ISO 7637-2 Pulse 1 (inductive load disconnect), Pulse 2a/2b (battery feed interruption), and Pulse 3a/3b (capacitive coupling) test profiles. With RθJA = 100 °C/W on a 5 mm × 5 mm Cu pad, it supports continuous operation up to TJ = 175 °C and handles repetitive surges when derated per Fig.2.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 26 V - Maximum continuous reverse operating voltage; compatible with 24 V nominal systems with ±10% tolerance and ripple margin. |
| VBR @ IT = 1 mA | 28.9–31.9 V - Breakdown voltage range defining turn-on threshold; ensures reliable conduction before system damage occurs. |
| VC @ IPPM = 4.8 A | 42.1 V - Clamping voltage during 10/1000 µs surge; limits stress on protected ICs to safe levels. |
| PPPM | 200 W - Peak pulse power handling capability; satisfies ISO 7637-2 Pulse 1 (−100 V/2 Ω) and Pulse 2b (−100 V/50 Ω) requirements. |
| IR @ VWM | <1 µA - Reverse leakage at 26 V; minimizes standby power loss and avoids false triggering in high-impedance sensing nodes. |
| TJ max | +175 °C - Maximum junction temperature; enables deployment in under-hood automotive environments and industrial enclosures without forced cooling. |
Pinout & Package
Package: SOD-123W - Surface-mount plastic package with matte tin-plated leads, UL 94V-0 molding compound, JESD201 Class 2 whisker resistance, and cathode band polarity marking. Weight: 0.016 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or low-impedance return path; forms clamping loop with cathode during transient events. |
| Cathode | High-side transient input | Connected to protected line (e.g., CAN_H, LIN, sensor supply); conducts avalanche current to anode when VAK exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - required for engine control, body electronics, and ADAS modules. |
| Glass-passivated junction | Enhances long-term stability and moisture resistance vs. epoxy-passivated alternatives - critical for under-hood and outdoor industrial deployments. |
| Clamping ratio VC/VBR ≈ 1.35 | Indicates efficient voltage limiting with minimal overvoltage margin - reduces risk of latch-up or gate oxide stress in protected MOSFETs or microcontrollers. |
| Moisture sensitivity level 1 | No floor life limitation or baking requirement before reflow - simplifies SMT assembly and eliminates yield loss from moisture-induced popcorning. |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 24 V supply rail in engine control units (ECUs) from load dump and alternator transients per ISO 7637-2 Pulse 5a. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery input and DC-DC converter input stage. Use Value: Limits transient voltage to ≤42.1 V, preventing overvoltage shutdown or damage to 40 V-rated buck controllers and LDOs. | Use Scenario: Safeguarding analog inputs of 4–20 mA current-loop transmitters exposed to field wiring ESD and inductive kickback. IC Role / Device Role / Timing Role: TVS connected across signal and return lines upstream of precision op-amp front-end. Use Value: Sub-1 µA leakage avoids offset error in µA-level current measurement; 42.1 V clamping preserves 24 V system integrity. |
| Automotive LIN Bus Protection | Smart Lighting Driver Protection |
Use Scenario: Shielding LIN physical layer transceivers from ESD events and cable discharge during vehicle assembly or service. IC Role / Device Role / Timing Role: Unidirectional TVS placed between LIN bus line and ground, adjacent to transceiver pin. Use Value: 26 V VWM allows normal LIN signaling (up to 18 V dominant, 12 V recessive) while clamping ESD spikes to safe levels. | Use Scenario: Protecting LED driver ICs in automotive headlamps from inductive switching transients generated by PWM-controlled MOSFETs. IC Role / Device Role / Timing Role: TVS mounted across high-side switch drain-source or supply rail to ground. Use Value: 200 W peak power rating absorbs energy from flyback spikes without degradation; SOD-123W fits tight board space near power FETs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ26A | Same VWM (26 V), higher VC (43.0 V), lower PPPM (400 W but in SMA package; actual SOD-123W-equivalent rating ~150 W) | Not AEC-Q101 qualified; lacks ISO 7637-2 compliance documentation | Acceptable for non-automotive industrial use where qualification is not mandated. |
| TPSMD26 | VWM = 26 V, VC = 42.5 V, PPPM = 200 W, AEC-Q101 qualified, but SMC package (larger footprint) | Requires PCB layout change due to larger SMC-2 footprint vs. SOD-123W | Preferred when higher thermal mass or legacy SMC design reuse is prioritized over miniaturization. |
Compared with SMAJ26A and TPSMD26, the SMF26AH delivers identical clamping performance in a smaller SOD-123W footprint, full AEC-Q101 validation, and documented ISO 7637-2 compliance - making it optimal for space-constrained automotive modules requiring zero qualification overhead.
Availability
SMF26AH is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor interfaces, LIN bus nodes, and smart lighting drivers requiring stable component supply, AEC-Q101 assurance, and consistent SOD-123W packaging.
Supply support for SMF26AH 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, rectifiers, and MOSFETs, with global distribution and AEC-Q101-compliant production lines.
The SMF26AH belongs to TSC's SMF-AH series of automotive-grade TVS diodes, engineered specifically for robust transient immunity in 12 V/24 V vehicle electrical systems and industrial control environments with harsh EMC requirements.
FAQ
What is the maximum clamping voltage of the SMF26AH under standard test conditions?
The SMF26AH has a maximum clamping voltage (VC) of 42.1 V when subjected to a 10/1000 µs waveform at IPPM = 4.8 A. This value is measured per JEDEC standards and confirmed in the official TSC datasheet revision A2103. The SMF26AH maintains this clamping performance across its specified operating temperature range and is validated for use in automotive transients where voltage overshoot must remain below 45 V.
Is the SMF26AH qualified for automotive applications per AEC-Q101?
Yes, the SMF26AH is explicitly AEC-Q101 qualified, as stated in the "Features" section of the TSC datasheet. This qualification covers stress tests including high-temperature reverse bias (HTRB), temperature cycling, and ESD (HBM ≥ 8 kV, CDM ≥ 1 kV). The SMF26AH is approved for use in engine control, body electronics, and infotainment systems where automotive-grade reliability is mandatory.
What package type does the SMF26AH use, and what are its key mechanical attributes?
The SMF26AH uses the SOD-123W surface-mount package, featuring matte tin-plated leads compliant with J-STD-002 solderability, UL 94V-0 flammability rating, JESD201 Class 2 whisker resistance, and cathode band polarity marking. Its weight is approximately 0.016 g. The SOD-123W footprint is optimized for automated placement and offers superior thermal performance (RθJL = 33 °C/W) compared to standard SOD-123.
Does the SMF26AH meet ISO 7637-2 for automotive transient immunity?
Yes, the SMF26AH is specified to meet ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b test profiles. This is explicitly listed in the "Features" section of the TSC datasheet. The device's 200 W peak pulse power rating, low clamping voltage, and AEC-Q101 qualification collectively ensure compliance with these standardized automotive transient immunity requirements.
What is the reverse leakage current specification for the SMF26AH at its working voltage?
The SMF26AH exhibits a maximum reverse leakage current (IR) of less than 1 µA at VWM = 26 V and TA = 25 °C. This ultra-low leakage is critical for preserving signal integrity in high-impedance sensor interfaces and minimizing quiescent power draw in always-on automotive modules. The SMF26AH maintains this performance across its full operating temperature range.
SMF26AH 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):
- 26V
- Voltage - Breakdown (Min):
- 28.9V
- Voltage - Clamping (Max) @ Ipp:
- 42.1V
- Current - Peak Pulse (10/1000µs):
- 4.8A
- 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
SMF26AH FAQ
1.How can I place an order for SMF26AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF26AH 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 SMF26AH reliable?
The price and inventory of SMF26AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF26AH is usually 5 days.
3.What payment methods are accepted for SMF26AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF26AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF26AH?
SMF26AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF26AH 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 SMF26AH?
For technical support, including SMF26AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF26AH requirements.
6.How does Aetrix verify that SMF26AH is sourced from the original manufacturer or authorized distributors?
All SMF26AH 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 SMF26AH meets industry standards.
7.What is the process for return or replacement of SMF26AH?
All SMF26AH units undergo pre-shipment inspection (PSI). If there is an issue with SMF26AH, 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 SMF26AH part is unused and in its original packaging.
Return procedure for SMF26AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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