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Taiwan Semiconductor Corporation SMF24AH
- Part No.:
- SMF24AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- SOD-123W
- Datasheet:
-
SMF24AH.pdf
- Description:
- TVS DIODE 24VWM 38.9VC SOD123W
- Quantity:
- Payment:
- Shipping:
Inventory:8,821
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Product details
Overview
SMF24AH from Taiwan Semiconductor is a unidirectional transient voltage suppressor diode in SOD-123W package, rated for 24 V working stand-off voltage (VWM), 26.7–29.5 V breakdown voltage (VBR), and 38.9 V clamping voltage (VC) at 5.1 A peak pulse current (IPPM), delivering 200 W peak pulse power with 10/1000 µs waveform for automotive-grade ESD and load-dump protection in power supply rails.
For engineers reviewing the SMF24AH datasheet, SMF24AH pinout, SMF24AH application, or SMF24AH equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, AEC-Q101 qualification, low leakage (<1 µA @ 24 V), and thermal resistance (RθJL = 33 °C/W) on standard PCB mounting.
Technical Context
The SMF24AH operates as a unidirectional TVS diode, leveraging a glass-passivated junction to achieve fast response (<1 ns) to transients while maintaining low leakage and high surge robustness. Its design targets automotive electronics where compliance with ISO 7637-2 Pulse 1 (inductive switch-off), Pulse 2a/2b (battery disconnection/reconnection), and Pulse 3a/3b (capacitive coupling) is mandatory.
Thermally, it relies on direct junction-to-lead conduction (RθJL = 33 °C/W) for effective power dissipation during repetitive surges, supported by a 175 °C maximum junction temperature and J-STD-020 Level 1 moisture sensitivity rating-enabling compatibility with standard reflow profiles without baking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC rail margin for 24 V systems. |
| VBR min/max | 26.7 V / 29.5 V - Breakdown occurs within this range at 1 mA test current; ensures predictable turn-on threshold across production lot. |
| VC @ IPPM | 38.9 V - Clamped voltage at 5.1 A peak pulse (10/1000 µs); limits downstream IC stress during ISO 7637-2 Pulse 2b events. |
| PPPM | 200 W - Peak pulse power handling capability; sustains 5.1 A × 38.9 V surge without failure under standardized waveform. |
| IR @ VWM | <1 µA - Reverse leakage at 24 V; minimizes quiescent power loss in always-on vehicle modules. |
| TJ max | +175 °C - Maximum junction temperature; enables operation in under-hood environments with high ambient thermal stress. |
Pinout & Package
Package: SOD-123W - Surface-mount plastic case with matte tin-plated leads, UL 94V-0 rated molding compound, cathode band polarity marking, and 0.016 g mass. Designed for automated placement and J-STD-002 solderability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Transient return path | Connected to system ground or low-side reference; completes clamping loop during overvoltage events. |
| Cathode | Reverse-biased terminal / Clamping node | Connected to protected line (e.g., 24 V rail); conducts when transient exceeds VWM, shunting energy to ground. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive use per stress test requirements including HTOL, TC, HAST, and UHST-ensuring reliability in vehicle ECUs. |
| Glass-passivated junction | Provides stable VBR tolerance and low IR drift over temperature and lifetime, critical for long-term field deployment. |
| ISO 7637-2 compliance | Meets Pulse 1 (−150 V/2 Ω), Pulse 2a (+100 V), Pulse 2b (−100 V), Pulse 3a/3b (±300 V) immunity requirements without external filtering. |
| SOD-123W footprint | Enables high-density layout with 5 mm × 5 mm Cu pad thermal relief; supports JEDEC-standard reflow and JESD201 Class 2 whisker resistance. |
Applications
| Automotive Body Control Module (BCM) | Industrial 24 V PLC I/O Protection |
|---|---|
Use Scenario: Protecting LIN bus transceivers and microcontroller GPIOs from load dump and battery reversal transients in door modules. IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed directly at connector entry point to limit voltage excursion to ≤38.9 V. Use Value: Prevents latch-up or permanent damage to 3.3 V/5 V logic interfaces while maintaining signal integrity during 100 V/500 ms pulses. | Use Scenario: Safeguarding digital input circuits of programmable logic controllers exposed to inductive kickback from solenoid valves. IC Role / Device Role / Timing Role: Fast-response transient suppressor absorbing 200 W surges with sub-ns reaction time to preserve input stage integrity. Use Value: Eliminates need for external RC snubbers or varistors, reducing BOM count and board space in DIN-rail mounted controllers. |
| Commercial Vehicle Telematics Unit | Off-Highway Equipment Power Distribution |
Use Scenario: Shielding GNSS receiver power input against alternator-induced spikes and jump-start transients in fleet management hardware. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 24 V input rail upstream of DC-DC converters and LDOs. Use Value: Ensures uninterrupted GPS lock and cellular connectivity by limiting rail collapse and preventing brownout resets during 150 V/2 Ω pulses. | Use Scenario: Protecting CAN transceiver VCC pins and sensor excitation outputs in hydraulic control manifolds operating in harsh vibration environments. IC Role / Device Role / Timing Role: Localized TVS element integrated into power distribution board near high-current switching nodes. Use Value: Maintains functional safety integrity (ASIL-B compatible) by suppressing EFT bursts up to 4 kV per IEC 61000-4-4 without degrading CAN signal rise/fall times. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ24A | Higher clamping voltage (43.5 V @ 5.1 A), lower PPPM (400 W), SMA package (larger footprint, higher RθJA). | Less suitable for tight 24 V rail margins; better for non-automotive industrial use with less stringent thermal constraints. | Choose SMAJ24A only if board space allows larger package and clamping margin >43 V is acceptable. |
| TPSMF24A | Same SOD-123W package, identical VWM/VBR/VC specs, but not AEC-Q101 qualified; RoHS/halogen-free compliant. | Lacks automotive qualification evidence; limited to consumer or industrial applications where AEC-Q101 is not mandated. | Select TPSMF24A for cost-sensitive non-automotive designs requiring identical electrical performance without qualification overhead. |
Compared with SMAJ24A and TPSMF24A, the SMF24AH uniquely combines AEC-Q101 qualification, 38.9 V clamping at 5.1 A, and SOD-123W thermal efficiency (RθJL = 33 °C/W), making it the preferred choice for space-constrained, thermally demanding automotive 24 V systems requiring certified reliability.
Availability
SMF24AH is available at Aetrix Electronics and suitable for automotive body control modules, industrial 24 V PLC I/O protection, and commercial vehicle telematics units requiring stable component supply with full traceability and lifecycle support.
Supply support for SMF24AH 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 analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in TVS diodes, rectifiers, MOSFETs, and power management devices.
The SMF series was developed specifically for AEC-Q101-compliant automotive transient suppression, targeting 12 V and 24 V power networks subject to ISO 7637-2 and ISO 16750-2 stress conditions.
FAQ
What is the maximum clamping voltage of the SMF24AH under standard test conditions?
The SMF24AH has a maximum clamping voltage (VC) of 38.9 V when subjected to a 10/1000 µs peak pulse current of 5.1 A. This value is measured per JEDEC standards and reflects the actual voltage seen by downstream circuitry during transient events-critical for ensuring compatibility with 3.3 V or 5 V logic interfaces powered from a 24 V rail. The SMF24AH maintains this clamping performance across its full operating temperature range.
Is the SMF24AH qualified for automotive applications?
Yes, the SMF24AH is AEC-Q101 qualified, having passed all required stress tests including high-temperature operating life (HTOL), temperature cycling (TC), highly accelerated stress test (HAST), and unbiased highly accelerated stress test (UHST). This qualification confirms its suitability for under-hood and cabin-mounted automotive electronics where reliability under thermal, mechanical, and electrical stress is mandatory-such as in BCMs, telematics units, and ADAS power domains.
What package type does the SMF24AH use, and what are its assembly advantages?
The SMF24AH uses the SOD-123W surface-mount package: a compact, leaded plastic case with matte tin-plated leads, UL 94V-0 flammability rating, and J-STD-002 solderability. Its small footprint supports high-density PCB layouts, while the optimized thermal path (RθJL = 33 °C/W) enables efficient heat transfer to copper pads. The SMF24AH is fully compatible with automated pick-and-place equipment and standard reflow profiles, including J-STD-020 Level 1 moisture sensitivity handling.
How does the SMF24AH perform under ISO 7637-2 transient test pulses?
The SMF24AH meets ISO 7637-2 requirements for Pulse 1 (inductive switch-off), Pulse 2a/2b (battery disconnection/reconnection), and Pulse 3a/3b (capacitive coupling), with verified clamping behavior up to 200 W peak pulse power. Its 38.9 V VC at 5.1 A ensures that protected circuits remain below destructive thresholds during standardized 10/1000 µs surges-even under worst-case junction temperature conditions. The SMF24AH's glass-passivated junction contributes to consistent pulse-to-pulse response without parameter drift.
What is the reverse leakage current specification for the SMF24AH at its working voltage?
The SMF24AH exhibits a maximum reverse leakage current (IR) of 1 µA when biased at its 24 V working stand-off voltage (VWM), measured at 25 °C. This ultra-low leakage minimizes standby power consumption in always-on vehicle systems such as alarm controllers or remote keyless entry receivers. The SMF24AH maintains leakage below 5 µA across its full −55 °C to +125 °C operating ambient range, supporting robust performance in extreme thermal environments.
SMF24AH 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):
- 24V
- Voltage - Breakdown (Min):
- 26.7V
- Voltage - Clamping (Max) @ Ipp:
- 38.9V
- Current - Peak Pulse (10/1000µs):
- 5.1A
- 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
SMF24AH FAQ
1.How can I place an order for SMF24AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF24AH 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 SMF24AH reliable?
The price and inventory of SMF24AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF24AH is usually 5 days.
3.What payment methods are accepted for SMF24AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF24AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF24AH?
SMF24AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF24AH 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 SMF24AH?
For technical support, including SMF24AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF24AH requirements.
6.How does Aetrix verify that SMF24AH is sourced from the original manufacturer or authorized distributors?
All SMF24AH 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 SMF24AH meets industry standards.
7.What is the process for return or replacement of SMF24AH?
All SMF24AH units undergo pre-shipment inspection (PSI). If there is an issue with SMF24AH, 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 SMF24AH part is unused and in its original packaging.
Return procedure for SMF24AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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