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Taiwan Semiconductor Corporation SMA4F24AH
- Part No.:
- SMA4F24AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-221AC, SMA Flat Leads
- Datasheet:
-
SMA4F24AH.pdf
- Description:
- 400W, 28.2V, 5%, UNIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:6,503
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Product details
Overview
SMA4F24AH from Taiwan Semiconductor is a unidirectional, AEC-Q101-qualified transient voltage suppressor diode in Thin SMA package, with 24 V working stand-off voltage (VWM), 26.8–29.6 V breakdown voltage (VBR @ 1 mA), 39.0 V clamping voltage (VC) at 10.3 A peak pulse current (IPPM), and 400 W peak pulse power (PPPM) rating for 10/1000 µs waveform - used to protect BLDC motor drives and automotive battery management systems against ESD and surge events.
For engineers reviewing the SMA4F24AH datasheet, SMA4F24AH pinout, SMA4F24AH application, or SMA4F24AH equivalent, key selection criteria include unidirectional polarity, 175 °C maximum junction temperature, 20 °C/W junction-to-lead thermal resistance, RoHS/halogen-free compliance, and J-STD-020 Level 1 moisture sensitivity - all critical for under-hood automotive and high-reliability industrial power rail protection.
Technical Context
The SMA4F24AH operates as a unidirectional avalanche diode, leveraging glass-passivated silicon junction technology to deliver precise voltage clamping during transient overvoltage events. Its 10/1000 µs waveform response supports IEC 61000-4-5 surge immunity up to 400 W without degradation.
Designed for surface-mount integration on 5 mm × 5 mm copper pads, it achieves 20 °C/W junction-to-lead thermal resistance and 62 °C/W junction-to-ambient resistance - enabling stable operation up to 175 °C junction temperature in constrained PCB layouts typical of motor control modules and automotive ECUs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24 V - maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 26.8 V / 29.6 V @ 1 mA - ensures reliable avalanche initiation within tight tolerance band |
| VC @ IPPM | 39.0 V @ 10.3 A - clamping voltage limits downstream IC stress during 10/1000 µs surges |
| PPPM | 400 W - peak transient energy absorption capability per IEC 61000-4-5 Level 4 |
| TJ max | +175 °C - enables placement near heat-generating components like MOSFETs in BLDC inverters |
| RθJL | 20 °C/W - low thermal resistance supports sustained power dissipation on standard FR-4 PCBs |
| Polarity | Unidirectional - blocks reverse current only; requires correct cathode orientation in circuit |
Pinout & Package
Thin SMA package: surface-mount, single-die, unidirectional TVS diode with cathode band marking. Dimensions conform to JEDEC DO-214AC outline; terminals are matte tin-plated, solderable per J-STD-002.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction path | Connected to lower-potential side (e.g., ground or return path) in unidirectional configuration |
| Cathode | Avalanche clamping node | Connected to protected line (e.g., 24 V rail); marked by band; conducts during overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing |
| Glass-passivated junction | Enhances long-term stability and reduces parameter drift under thermal stress and humidity |
| J-STD-020 Level 1 MSL | Zero bake requirement prior to reflow; compatible with standard SMT assembly processes |
| UL 94V-0 molding compound | Meets flammability safety requirements for enclosed automotive and industrial enclosures |
| Halogen-free (IEC 61249-2-21) | Supports environmental compliance and reduces corrosive gas emission during board failure |
Applications
| BLDC Motor Drive Protection | Automotive Battery Management System |
|---|---|
Use Scenario: Suppresses inductive kickback and load dump transients in 24 V BLDC gate driver power rails. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed across DC bus input to clamp voltage spikes below MOSFET VDS rating. Use Value: Prevents gate oxide damage and latch-up in half-bridge drivers by limiting VC to 39.0 V during 400 W surges. |
Use Scenario: Guards BMS front-end analog sensing inputs and CAN transceiver power lines against ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Standoff-rated TVS protecting 24 V supply rail feeding fuel pump controllers and cell monitoring ICs. Use Value: Maintains system uptime by absorbing 10/1000 µs surges up to 10.3 A without degradation at TJ = 175 °C. |
| LED Lighting Power Supply | Industrial SMPS Input Stage |
Use Scenario: Shields constant-current LED drivers from mains-borne surges and lightning-induced transients. IC Role / Device Role / Timing Role: Primary-side clamping device on 24 V auxiliary supply rail feeding PWM controller ICs. Use Value: Ensures >100,000 surge cycles at rated PPPM due to robust glass-passivated junction and 20 °C/W RθJL. |
Use Scenario: Protects AC-DC converter PFC stage and main DC bus against line transients in factory automation equipment. IC Role / Device Role / Timing Role: Secondary-side TVS on regulated 24 V output rail supplying PLC I/O modules. Use Value: Delivers repeatable clamping performance across -55 °C to +175 °C ambient, validated per AEC-Q101. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ24A | Lower PPPM (400 W same), but higher VC = 38.9 V @ 10.3 A; VBR = 26.7–29.5 V; non-AEC-Q101 | Lacks automotive qualification; suitable for industrial SMPS but not under-hood deployment | Select SMAJ24A only if AEC-Q101 is not required and cost is prioritized over long-term field reliability |
| SMBJ24A | Same VWM/VBR range, but SMB package (higher RθJA = 65 °C/W); PPPM = 600 W; VBR tempco not specified | Higher thermal resistance limits power handling in compact layouts; no temperature coefficient guarantee | Choose SMBJ24A only when higher peak power margin is needed and board space allows larger SMB footprint |
Compared with SMAJ24A and SMBJ24A, the SMA4F24AH uniquely combines AEC-Q101 qualification, 20 °C/W RθJL, and guaranteed 0.095 %/°C VBR temperature coefficient - making it the preferred choice for thermally constrained, automotive-grade 24 V rail protection where long-term parametric stability is mandatory.
Availability
SMA4F24AH is available at Aetrix Electronics and suitable for BLDC motor drives, automotive battery management systems, and industrial SMPS requiring stable component supply with full traceability and lifecycle continuity.
Supply support for SMA4F24AH 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, and power MOSFETs since 1979.
The SMA4FxxAH series was developed specifically for AEC-Q101-compliant transient suppression in automotive 12 V–60 V power networks, emphasizing thermal robustness, tight VBR tolerance, and process consistency across voltage grades.
FAQ
What is the clamping voltage of the SMA4F24AH at its rated peak pulse current?
The SMA4F24AH has a maximum clamping voltage (VC) of 39.0 V at 10.3 A peak pulse current (IPPM) under 10/1000 µs waveform conditions. This value is measured per standard test conditions and ensures downstream components remain within safe operating voltage limits during surge events. The SMA4F24AH maintains this clamping performance across its full operating temperature range from –55 °C to +175 °C.
Is the SMA4F24AH qualified for automotive applications?
Yes, the SMA4F24AH is AEC-Q101 qualified, having passed stress tests including high-temperature reverse bias, temperature cycling, and ESD per JESD22 standards. This qualification confirms its suitability for under-hood and chassis-mounted automotive systems such as BLDC motor controllers and battery management units. The SMA4F24AH's glass-passivated junction and halogen-free construction further support automotive reliability requirements.
What is the thermal resistance from junction to lead for the SMA4F24AH?
The SMA4F24AH has a typical junction-to-lead thermal resistance (RθJL) of 20 °C/W when mounted on a 5 mm × 5 mm copper pad per JEDEC test board guidelines. This low thermal resistance enables efficient heat transfer to the PCB, supporting sustained operation at elevated ambient temperatures - especially important in compact motor drive modules where airflow is limited and thermal management relies heavily on copper pour conduction.
Does the SMA4F24AH have a specified breakdown voltage temperature coefficient?
Yes, the SMA4F24AH has a maximum VBR temperature coefficient of 0.095 %/°C, as stated in the official Taiwan Semiconductor datasheet. This specification applies across the full operating junction temperature range and ensures predictable voltage shift with temperature - a critical parameter for precision protection in wide-temperature automotive and industrial environments where the SMA4F24AH is deployed.
What packaging and moisture sensitivity level does the SMA4F24AH use?
The SMA4F24AH is supplied in Thin SMA (DO-214AC) package on tape-and-reel (14,000 units per reel) and is rated at Moisture Sensitivity Level 1 per J-STD-020 - meaning it may be stored indefinitely at ≤30 °C/60% RH and requires no baking prior to surface-mount reflow. Its matte tin-plated leads meet J-STD-002 solderability requirements, ensuring consistent wetting and joint integrity during automated assembly of the SMA4F24AH.
SMA4F24AH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-221AC, SMA Flat Leads
- Series:
- SMA4F
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 24V
- Voltage - Breakdown (Min):
- 26.8V
- Voltage - Clamping (Max) @ Ipp:
- 39V
- Current - Peak Pulse (10/1000µs):
- 10.3A
- Power - Peak Pulse:
- 400W
- 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:
- Thin SMA
SMA4F24AH FAQ
1.How can I place an order for SMA4F24AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA4F24AH 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 SMA4F24AH reliable?
The price and inventory of SMA4F24AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA4F24AH is usually 5 days.
3.What payment methods are accepted for SMA4F24AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA4F24AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA4F24AH?
SMA4F24AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA4F24AH 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 SMA4F24AH?
For technical support, including SMA4F24AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA4F24AH requirements.
6.How does Aetrix verify that SMA4F24AH is sourced from the original manufacturer or authorized distributors?
All SMA4F24AH 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 SMA4F24AH meets industry standards.
7.What is the process for return or replacement of SMA4F24AH?
All SMA4F24AH units undergo pre-shipment inspection (PSI). If there is an issue with SMA4F24AH, 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 SMA4F24AH part is unused and in its original packaging.
Return procedure for SMA4F24AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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