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Taiwan Semiconductor Corporation SA24CAH
- Part No.:
- SA24CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA24CAH.pdf
- Description:
- TVS DIODE 24VWM 50.1VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,013
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Product details
Overview
SA24CAH from Taiwan Semiconductor is a bidirectional 500W transient voltage suppressor (TVS) diode in DO-204AC (DO-15) package, with 24V working stand-off voltage (VWM), 26.7–32.6V breakdown voltage (VBR), and 42.1V maximum clamping voltage (VC) at 12A peak pulse current - designed for automotive-grade ESD and electrical fast transient (EFT) protection of 24V power rails and signal lines.
For engineers reviewing the SA24CAH datasheet, SA24CAH pinout, SA24CAH application, or SA24CAH equivalent, this AEC-Q101 qualified TVS provides verified bidirectional surge suppression for 24V industrial control inputs, automotive body electronics, CAN transceiver protection, and DC-DC converter input stages - with sub-5ns response time and <1μA reverse leakage above 10V.
Technical Context
The SA24CAH is a silicon avalanche diode engineered for bidirectional clamping across both polarities, meeting IEC 61000-4-2 (±30kV contact), IEC 61000-4-4 (±4kV EFT), and ISO 16750-2 load-dump immunity requirements when used with appropriate series impedance. Its 500W peak pulse power rating applies to the standardized 10/1000μs waveform per ANSI/IEEE C62.35.
Thermal derating begins above 25°C ambient, with full 500W capability only at TA = 25°C; junction temperature must remain ≤175°C under surge conditions. The device exhibits a +31 mV/°C VBR temperature coefficient and operates from –55°C to +175°C, supporting under-hood automotive environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24 V - Maximum continuous DC or RMS voltage the device blocks without clamping; defines safe operating margin for 24V nominal systems. |
| VBR min/max | 26.7 V / 32.6 V at 1 mA - Verified avalanche onset range; ensures reliable triggering before downstream IC damage thresholds. |
| VC @ IPPM | 42.1 V at 12 A - Clamped voltage during 10/1000μs surge; limits stress on protected 24V logic or transceivers to <1.76× VWM. |
| PPK | 500 W - Peak surge power handling per single 10/1000μs pulse; sufficient for ISO 7637-2 Pulse 1 (inductive switch-off) and Pulse 3a/b. |
| IR @ VWM | <1 μA - Reverse leakage at 24V; negligible power loss and no measurable impact on 24V rail stability or sensor biasing. |
| TJ max | +175 °C - Maximum junction temperature; enables placement near hot components (e.g., power MOSFETs, DC-DC inductors) in automotive modules. |
| Response time | <5.0 ns - Time from 0 V to VBR under bidirectional transient; faster than most microcontroller GPIO or CAN PHY response windows. |
Pinout & Package
Package: DO-204AC (DO-15), axial leaded, epoxy-molded case meeting UL 94V-0; cathode band marking denotes polarity for unidirectional variants - but SA24CAH is bidirectional and has no polarity marking requirement per datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional avalanche junction | Either terminal serves as anode or cathode depending on transient polarity; no PCB orientation dependency required. |
| Lead 1 / Lead 2 | Surge current path | Both leads conduct equal peak pulse current (12 A); must be routed with low-inductance traces and connected directly to protected node and ground/power return. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including engine control, body electronics, and infotainment - includes HTOL, TC, UHAST, and ESD testing per stress test plan. |
| 500W 10/1000μs surge rating | Withstands repetitive ISO 7637-2 Pulse 1 (–150V, 50Ω, 2Ω source) without degradation when mounted per JEDEC standards. |
| <5 ns bidirectional response | Clamps transients before propagation into sensitive analog front-ends or digital I/Os - critical for protecting CAN FD, LIN, and SENT interfaces. |
| RoHS & halogen-free | Complies with IEC 61249-2-21; suitable for automotive OEMs requiring full material declaration and WEEE compliance. |
| Low clamping ratio (VC/VBR ≈ 1.57) | Minimizes overvoltage overshoot during clamping - improves margin for 3.3V/5V logic powered from 24V via LDO or buck converter. |
Applications
| Automotive Body Control Module (BCM) | Industrial 24V PLC Input Protection |
|---|---|
Use Scenario: Protecting microcontroller GPIOs and relay driver outputs from inductive kickback during solenoid/actuator switching in door lock, window lift, and lighting control circuits. IC Role / Device Role / Timing Role: Bidirectional clamping element placed between protected node and chassis ground, absorbing energy from negative- and positive-going transients up to 500W. Use Value: Prevents latch-up or permanent damage to 3.3V/5V MCU I/Os rated for ≤15V absolute maximum, enabling robust operation in harsh 12V/24V vehicle electrical environments. |
Use Scenario: Safeguarding isolated digital input channels on programmable logic controllers against surges induced by nearby motor drives, contactor switching, or lightning-induced ground potential rise. IC Role / Device Role / Timing Role: Primary transient shunt on field-side 24V input line, positioned upstream of optocoupler or digital isolator input stage. Use Value: Maintains functional safety integrity by limiting input voltage to ≤42.1V during 1kV/500A surge events, preserving isolation barrier reliability and preventing false triggering. |
| CAN Transceiver Protection | DC-DC Converter Input Stage |
Use Scenario: Shielding high-speed CAN FD transceivers (e.g., TJA1044, SN65HVD256) from ESD and coupled transients on vehicle bus wiring harnesses. IC Role / Device Role / Timing Role: Low-capacitance (<100 pF) bidirectional clamp placed across CAN_H and CAN_L differential pair, referenced to local ground. Use Value: Ensures signal integrity by clamping common-mode transients without distorting 2 Mbps CAN FD waveforms - validated per ISO 11898-2 EMC test plans. |
Use Scenario: Suppressing load-dump spikes (up to +60V for 400ms) and alternator ripple on the input of 24V-to-5V/3.3V buck converters powering ADAS sensors or infotainment SoCs. IC Role / Device Role / Timing Role: First-line transient absorber before input capacitor and controller IC, reducing stress on MOSFETs and gate drivers. Use Value: Extends converter lifetime by limiting input voltage to 42.1V during 10/1000μs surges - preventing overvoltage shutdown or internal FET avalanche failure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ24CA | Same DO-214AC package, 24V VWM, but lower PPK (400W) and higher VC (43.5V at 9.2A); not AEC-Q101 qualified. | Limited to non-automotive industrial use; insufficient for ISO 7637-2 Pulse 1 in automotive BCM designs. | Select SMAJ24CA only for cost-sensitive 24V consumer or white-goods applications where AEC-Q101 is not mandated. |
| 1.5KE24CA | Higher PPK (1500W), larger DO-204AL (DO-41) package, same VWM/VC specs; AEC-Q101 not claimed in standard datasheet. | Requires PCB rework due to larger footprint and lead spacing; unsuitable for space-constrained automotive modules. | Choose 1.5KE24CA only when surge energy exceeds 500W and board layout allows DO-41 mounting - not a drop-in replacement. |
Compared with SMAJ24CA and 1.5KE24CA, SA24CAH uniquely delivers AEC-Q101 validation, DO-15 compactness, and precise 500W/42.1V clamping performance - making it the optimal choice for production automotive electronics where qualification, size, and repeatable surge margin are jointly critical.
Availability
SA24CAH is available at Aetrix Electronics and suitable for automotive body electronics, industrial 24V PLC inputs, CAN transceiver protection, and DC-DC converter input stages requiring stable component supply with full AEC-Q101 traceability and RoHS/halogen-free compliance.
Supply support for SA24CAH 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 - headquartered in Hsinchu, Taiwan, with global distribution and AEC-Q101 certification capabilities.
The SA Series was developed specifically for automotive and industrial transient suppression, emphasizing AEC-Q101 reliability, tight VBR tolerances, and consistent clamping performance across temperature - targeting 12V/24V system protection where legacy Zener-based TVS lacked robustness.
FAQ
What does the "H" suffix in SA24CAH signify?
The "H" suffix in SA24CAH explicitly denotes AEC-Q101 qualification per Taiwan Semiconductor's ordering code convention (as confirmed in Version L2105, Section 5). This means SA24CAH has undergone accelerated stress testing including high-temperature operating life, temperature cycling, and ESD verification - ensuring suitability for automotive under-hood and body electronics applications where reliability is mission-critical.
Is SA24CAH unidirectional or bidirectional, and how is polarity marked?
SA24CAH is a bidirectional TVS diode, as indicated by the "CA" suffix (per datasheet note: "C or CA suffix for types SA5.0 – types SA170" for bipolar use). Unlike unidirectional SA24A variants, SA24CAH has no cathode band marking and functions identically in both directions - eliminating PCB orientation constraints and simplifying layout for differential or AC-coupled protection schemes.
What is the maximum clamping voltage of SA24CAH under surge conditions?
The maximum clamping voltage (VC) of SA24CAH is 42.1 V at 12 A peak pulse current (IPPM), measured using the standard 10/1000 μs double-exponential waveform. This value is guaranteed across the full operating temperature range and ensures protected 24V system nodes remain below 43 V during worst-case transients - well within the safe operating area of most 24V-rated interface ICs and regulators.
Can SA24CAH replace SA24A in an existing design?
No - SA24CAH cannot directly replace SA24A because they differ fundamentally in conduction behavior: SA24A is unidirectional (cathode-marked, blocks reverse voltage), while SA24CAH is bidirectional (no polarity marking, clamps both polarities). Substituting SA24CAH for SA24A would compromise reverse-bias blocking in DC-coupled applications and may cause unintended conduction paths.
What is the junction temperature limit and thermal derating behavior of SA24CAH?
SA24CAH has a maximum junction temperature (TJ) of +175°C and derates linearly above TA = 25°C per Figure 2 in the datasheet. At 75°C ambient, its peak pulse power drops to ~350W; at 125°C, it falls to ~175W. Proper PCB copper pour (10 × 10 mm per lead) and airflow must be maintained to avoid exceeding TJ during repeated surge events - especially in sealed automotive enclosures.
SA24CAH 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:
- 50.1V
- Current - Peak Pulse (10/1000µs):
- 13.4A
- Power - Peak Pulse:
- 500W
- Power Line Protection:
- No
- Applications:
- -
- 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)
SA24CAH FAQ
1.How can I place an order for SA24CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for SA24CAH 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 SA24CAH reliable?
The price and inventory of SA24CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA24CAH is usually 5 days.
3.What payment methods are accepted for SA24CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA24CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA24CAH?
SA24CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA24CAH 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 SA24CAH?
For technical support, including SA24CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA24CAH requirements.
6.How does Aetrix verify that SA24CAH is sourced from the original manufacturer or authorized distributors?
All SA24CAH 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 SA24CAH meets industry standards.
7.What is the process for return or replacement of SA24CAH?
All SA24CAH units undergo pre-shipment inspection (PSI). If there is an issue with SA24CAH, 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 SA24CAH part is unused and in its original packaging.
Return procedure for SA24CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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