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Taiwan Semiconductor Corporation SA24C
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- Part No.:
- SA24C
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA24C.pdf
- Description:
- 500W, 29.7V, 10%, BIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:5,193
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Product details
Overview
SA24C from Taiwan Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in DO-204AC (DO-15) package, rated for 500W peak pulse power at 10/1000μs, with 24V working stand-off voltage (VWM), 26.7–32.6V breakdown voltage (VBR @ 1mA), and 42.1V maximum clamping voltage (VC) at 12A peak pulse current - used to protect automotive lighting control ICs against load dump and inductive switching transients.
For engineers reviewing the SA24C datasheet, SA24C pinout, SA24C application, or SA24C equivalent, key selection criteria include clamping performance under 10/1000μs surge, unidirectional polarity marking, AEC-Q101 qualification status, thermal derating above 25°C, and compatibility with J-STD-002 solderability requirements on tin-plated leads.
Technical Context
The SA24C operates as a unidirectional avalanche diode, triggering when reverse voltage exceeds its VBR range (26.7–32.6V) to shunt transient energy to ground. Its low dynamic impedance ensures rapid clamping response (<1.0ps from 0V to VBR) and stable protection during repetitive EFT events.
Designed for automotive-grade reliability, it supports junction temperatures from –55°C to +175°C, features UL 94V-0 molding compound, and meets JESD201 Class 2 whisker resistance. The cathode band marking confirms unidirectional polarity per DO-204AC mechanical standard.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24 V - Maximum continuous reverse operating voltage before clamping begins; defines safe system bus voltage margin. |
| VBR @ 1mA | 26.7–32.6 V - Breakdown voltage range at 1mA test current; determines precise turn-on threshold under surge conditions. |
| VC @ IPPM | 42.1 V at 12 A - Clamped voltage during 10/1000μs surge; directly limits stress on downstream ICs like LED drivers or microcontrollers. |
| PPK | 500 W - Peak pulse power rating per 10/1000μs waveform; validates capability to absorb automotive load-dump energy without failure. |
| IR @ VWM | <1 μA - Reverse leakage at 24V; ensures negligible standby current drain in always-on vehicle modules. |
| TJ max | +175 °C - Maximum junction temperature; enables operation in under-hood environments with minimal thermal derating. |
| Package | DO-204AC (DO-15) - Standard axial-leaded through-hole package with 0.400g mass; compatible with legacy PCB assembly and manual rework. |
Pinout & Package
DO-204AC (DO-15) package: axial-leaded, molded epoxy body with cathode band marking for unidirectional polarity. Leads are pure tin-plated, solderable per J-STD-002, and meet JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction path / Ground reference | Connected to system ground; completes low-impedance surge shunt path during overvoltage events. |
| Cathode | Reverse-biased input / Protected line connection | Connected to protected node (e.g., 24V rail); avalanche conduction initiates here when V > VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified option | Available as SA24CH variant - validated for automotive under-hood applications including engine control and lighting modules. |
| Fast avalanche response | <1.0 ps rise time from 0V to VBR - minimizes voltage overshoot during nanosecond-scale ESD/EFT transients. |
| Low clamping ratio | VC/VBR ≈ 1.52 (42.1V / 27.7V typ.) - ensures tight voltage limiting relative to breakdown, reducing risk of IC latch-up. |
| Halogen-free & RoHS compliant | Meets IEC 61249-2-21 and EU RoHS Directive - supports environmentally regulated automotive and industrial supply chains. |
| UL 94V-0 flammability rating | Molding compound certified for flame resistance - required for safety-critical vehicle subsystems and enclosed lighting housings. |
Applications
| Automotive LED Headlamp Driver Protection | Industrial PLC Digital Input Protection |
|---|---|
Use Scenario: Protecting 24V LED driver ICs from load-dump transients (ISO 7637-2 Pulse 5a) in vehicle headlamp modules. IC Role / Device Role: Unidirectional TVS placed between 24V supply rail and ground, upstream of DC/DC controller. Use Value: Limits clamped voltage to 42.1V during 500W surges, preventing damage to sensitive buck controller ICs rated for ≤45V absolute max. |
Use Scenario: Safeguarding 24V digital input channels on programmable logic controllers against field-wiring induced surges and EFT bursts. IC Role / Device Role: Front-end protection device on isolated input optocoupler stage, absorbing fast-rising transients before signal conditioning. Use Value: Sub-1.0ps response ensures clamping activation prior to EFT edge propagation into isolation barrier, maintaining signal integrity and immunity compliance (IEC 61000-4-4). |
| Commercial Lighting Ballast Control | Automotive HVAC Blower Motor Driver |
Use Scenario: Shielding microcontroller GPIOs and MOSFET gate drivers in electronic ballasts from inductive kickback during lamp ignition. IC Role / Device Role: Localized TVS on low-voltage control rails (e.g., 12V bias supply), co-located with driver ICs. Use Value: 1μA leakage at 24V prevents false triggering in high-impedance sensing circuits while enabling robust 500W surge handling. |
Use Scenario: Suppressing voltage spikes generated by brushed blower motor commutation in vehicle HVAC systems. IC Role / Device Role: Rail-to-ground TVS on 12V motor drive power path, protecting half-bridge gate drivers and current-sense amplifiers. Use Value: 175°C max junction temperature allows direct mounting near motor control PCBs without thermal derating penalties in confined enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ24A | Same DO-214AC package, bidirectional configuration, 38.9V VC @ 12.3A; higher IR (≤5μA @ 24V) | Requires polarity-insensitive placement; less suitable for single-rail DC systems where unidirectional clamping is preferred. | Select SA24C when unidirectional polarity control, lower leakage, and AEC-Q101 qualification are required. |
| ON Semiconductor 1.5SMC24A | DO-214AB package (larger footprint), 38.9V VC @ 12.3A, 175°C TJ max, but no AEC-Q101 variant available | Requires PCB layout change due to different outline and lead spacing; lacks automotive qualification path. | Choose SA24C for drop-in replacement in DO-15 footprints and certified automotive use cases. |
Compared with SMAJ24A and 1.5SMC24A, the SA24C offers superior leakage performance (<1μA), native DO-204AC compatibility, and optional AEC-Q101 qualification - making it optimal for space-constrained, thermally demanding, and automotive-compliant 24V rail protection.
Availability
SA24C is available at Aetrix Electronics and suitable for automotive lighting control, industrial PLC input stages, commercial lighting ballasts, and HVAC motor drive circuits requiring stable component supply across extended production lifecycles.
Supply support for SA24C 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, Zener diodes, and MOSFETs for industrial and automotive markets.
The SA Series was developed specifically for high-reliability transient suppression in 12V/24V automotive and industrial power rails, emphasizing low clamping voltage, fast response, and AEC-Q101 qualification readiness.
FAQ
What is the polarity configuration of the SA24C?
The SA24C is a unidirectional TVS diode, with cathode marked by a band on the DO-204AC (DO-15) package body. It conducts in reverse bias above VBR and blocks forward current up to 3.5V at 35A. This polarity is essential for proper placement on positive-rail protection applications, and the SA24C datasheet specifies cathode-to-rail orientation for 24V system protection.
Does the SA24C meet AEC-Q101 qualification?
The base SA24C is not AEC-Q101 qualified; however, the SA24CH variant - indicated by the "H" suffix in the ordering code - is fully AEC-Q101 qualified for automotive applications. SA24CH undergoes stress testing per AEC-Q101 Rev D, including HTGB, AC-H3TRB, and temperature cycling, and is documented in TSC's official AEC-Q101 product list.
What is the maximum clamping voltage of the SA24C under standard surge conditions?
The SA24C has a maximum clamping voltage (VC) of 42.1V at 12A peak pulse current (IPPM), tested with the 10/1000μs waveform. This value is guaranteed across the full operating temperature range and defines the upper voltage limit imposed on protected circuitry during a 500W transient event.
Can the SA24C be used in bidirectional signal line protection?
No - the SA24C is strictly unidirectional and unsuitable for bidirectional signal lines such as RS-485 or CAN bus. For bidirectional protection at ~24V, TSC offers the SA24CA variant (with "CA" suffix), which provides symmetrical clamping in both directions and is explicitly listed in the SA Series data sheet for bipolar applications.
What is the thermal derating behavior of the SA24C above 25°C ambient?
The SA24C's peak pulse power (PPK) derates linearly above 25°C ambient, following the curve in Figure 2 of the datasheet: at 75°C ambient, PPK drops to approximately 350W; at 125°C, it falls to ~175W. This derating must be applied when sizing for sustained high-temperature environments like engine compartments or sealed lighting housings.
SA24C Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-204AC, DO-15, Axial
- Series:
- SA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 24V
- Voltage - Breakdown (Min):
- 26.7V
- Voltage - Clamping (Max) @ Ipp:
- 42.1V
- Current - Peak Pulse (10/1000µs):
- 12A
- Power - Peak Pulse:
- 500W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AC (DO-15)
SA24C FAQ
1.How can I place an order for SA24C through Aetrix?
Please submit a Request for Quotation (RFQ) for SA24C 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 SA24C reliable?
The price and inventory of SA24C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA24C is usually 5 days.
3.What payment methods are accepted for SA24C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA24C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA24C?
SA24C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA24C 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 SA24C?
For technical support, including SA24C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA24C requirements.
6.How does Aetrix verify that SA24C is sourced from the original manufacturer or authorized distributors?
All SA24C 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 SA24C meets industry standards.
7.What is the process for return or replacement of SA24C?
All SA24C units undergo pre-shipment inspection (PSI). If there is an issue with SA24C, 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 SA24C part is unused and in its original packaging.
Return procedure for SA24C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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