My Inquiry
My Account
Taiwan Semiconductor Corporation SA24H
- Part No.:
- SA24H
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA24H.pdf
- Description:
- 500W, 29.7V, 10%, UNIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:6,467
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SA24H from Taiwan Semiconductor is an AEC-Q101-qualified 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 - deployed for automotive ESD and load-dump protection in power supply rails.
For engineers reviewing the SA24H datasheet, SA24H pinout, SA24H application, or SA24H equivalent, this page delivers verified electrical parameters, mechanical package data, clamping performance under standardized surge waveforms, polarity marking guidance, and AEC-Q101 qualification status - all critical for automotive-grade circuit hardening and IEC 61000-4-2/-4-4 compliance design.
Technical Context
The SA24H operates as a unidirectional avalanche diode, triggering when reverse voltage exceeds its VBR range (26.7–32.6V) to clamp transients while maintaining low dynamic impedance. Its fast response time (<1.0ps from 0V to VBR) ensures protection before sensitive downstream ICs experience overvoltage stress.
Designed for single-polarity DC rail protection, it supports steady-state power dissipation of 3W at TL = 75°C on 10×10 mm copper pads and withstands 70A non-repetitive forward surge current (8.3ms half-sine). Junction temperature range spans –55°C to +175°C, enabling under-hood automotive deployment.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 24 V - Maximum continuous reverse operating voltage before leakage exceeds 1 μA; defines safe DC rail margin. |
| VBR @ 1 mA | 26.7–32.6 V - Measured breakdown range at 1 mA test current; determines minimum trigger threshold under surge conditions. |
| VC @ IPPM | 42.1 V at 12 A - Clamped voltage during 10/1000μs surge; sets worst-case overvoltage seen by protected ICs. |
| PPK | 500 W - Peak pulse power rating per 10/1000μs waveform; quantifies transient energy absorption capability. |
| IR @ VWM | <1 μA - Reverse leakage at 24 V; ensures minimal standby power loss and signal integrity in high-impedance circuits. |
| TJ max | +175 °C - Maximum junction temperature; enables operation in engine compartment environments without thermal derating. |
| AEC-Q101 | Qualified - Validated for automotive reliability (HTOL, TC, HTRB, UHAST); required for ASIL-B/C system-level designs. |
Pinout & Package
SA24H uses the DO-204AC (DO-15) axial-leaded package with cathode band marking for unidirectional polarity. Leads are pure tin-plated, solderable per J-STD-002, and meet JESD 201 Class 2 whisker resistance. Weight is approximately 0.400 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Forward conduction terminal | Connected to ground or low-side return path; conducts during forward surge events (e.g., reverse battery). |
| Cathode (banded end) | Reverse-biased clamping terminal | Connected to protected line (e.g., 24V rail); avalanches into conduction when voltage exceeds VBR to shunt surge current. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive temperature cycling, high-temp operating life, and unbiased HAST - required for front-end power modules and body control units. |
| 500W 10/1000μs surge rating | Withstands ISO 7637-2 Pulse 1 (inductive load dump) and IEC 61000-4-5 Combination Wave surges without degradation. |
| <1.0 ps response time | Clamps within picoseconds of overvoltage onset - faster than most microcontrollers' internal protection, preventing latch-up or gate oxide damage. |
| Low clamping ratio (VC/VBR ≈ 1.3–1.6) | Minimizes overvoltage overshoot during clamping; critical for protecting 3.3V/5V logic interfaces powered from 24V supplies via LDOs. |
| RoHS & halogen-free | Complies with IEC 61249-2-21 and automotive ELV directives; supports green manufacturing and end-of-life recycling requirements. |
Applications
| Automotive Power Rail Protection | Industrial PLC Input Protection |
|---|---|
Use Scenario: 24V battery-fed ECUs exposed to load dump (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Primary clamping device placed at connector entry point to limit rail voltage to ≤42.1V during 100–400V transients. Use Value: Prevents permanent damage to CAN transceivers, microcontroller I/Os, and voltage regulators by limiting peak clamped voltage below their absolute maximum ratings. |
Use Scenario: Digital input modules receiving 24V dry-contact signals in factory automation cabinets. IC Role / Device Role / Timing Role: Front-end TVS on each channel to absorb EFT bursts (IEC 61000-4-4) and contact bounce-induced spikes. Use Value: Maintains signal integrity and prevents false triggering of optocouplers or Schmitt triggers by clamping sub-10ns transients before they propagate into logic circuitry. |
| LED Driver Overvoltage Clamp | DC-DC Converter Input Stage |
Use Scenario: Constant-current LED drivers in commercial lighting subjected to lightning-induced surges on AC/DC input lines. IC Role / Device Role / Timing Role: Unidirectional TVS placed across bulk capacitor input to clamp positive-going transients before they reach switching controller. Use Value: Enables use of lower-voltage-rated electrolytic capacitors and MOSFETs by limiting input voltage excursion to 42.1V, reducing BOM cost and footprint. |
Use Scenario: 24V-to-5V buck converter powering infotainment head units, where input rail experiences cranking dips and load dump spikes. IC Role / Device Role / Timing Role: First-line protection upstream of input filter and controller IC, absorbing energy before LC filter attenuation. Use Value: Extends lifetime of input-stage ceramic capacitors and prevents controller shutdown due to overvoltage lockout activation during transient events. |
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 | Same DO-214AC package, but 24V VWM, 26.7–29.5V VBR, 38.9V VC @ 13A - lower clamping voltage but no AEC-Q101 qualification. | Preferred for industrial consumer products where automotive qualification is not mandated; unsuitable for ASIL-compliant systems. | Select SMAJ24A only if AEC-Q101 is not required and lower clamping voltage justifies trade-off in qualification rigor. |
| 1.5KE24A | Higher-power through-hole part (1500W), DO-201AD package, 24V VWM, 26.7–29.5V VBR, 38.9V VC @ 38.8A - larger footprint and higher surge capacity. | Used where legacy board layouts require DO-201AD or where >500W surge immunity is needed (e.g., heavy-duty vehicle alternators). | Choose 1.5KE24A when board space allows larger package and system-level surge testing requires >500W rating. |
Compared with SMAJ24A and 1.5KE24A, SA24H uniquely combines AEC-Q101 qualification, DO-15 form factor, and precise 500W/12A clamping performance - making it the optimal choice for new automotive electronics designs requiring validated reliability in compact footprints.
Availability
SA24H is available at Aetrix Electronics and suitable for automotive ECU protection, industrial PLC input hardening, LED driver surge suppression, and DC-DC converter input stage clamping requiring stable component supply across production lifecycles.
Supply support for SA24H 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 bipolar transistors since 1979.
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 power rail protection in harsh environments.
FAQ
What is the polarity configuration of SA24H?
The SA24H is a unidirectional TVS diode with cathode band marking on the DO-204AC (DO-15) package. It conducts in forward bias (anode to cathode) during reverse-battery events and avalanches in reverse bias to clamp positive transients on the cathode-connected line. This configuration matches standard 24V rail protection topology where cathode connects to the protected line and anode to ground.
Does SA24H meet automotive qualification standards?
Yes, SA24H is explicitly AEC-Q101 qualified per the manufacturer's ordering code suffix "H", confirming validation for high-temperature operating life, temperature cycling, humidity testing, and unbiased HAST. This qualification makes SA24H suitable for ASIL-B and ASIL-C automotive subsystems including body control modules, lighting controllers, and sensor interfaces.
What is the maximum clamping voltage of SA24H under surge conditions?
The SA24H has a maximum clamping voltage (VC) of 42.1 V at 12 A peak pulse current (IPPM), measured using the standardized 10/1000 μs double-exponential surge waveform. This value represents the highest voltage that will appear across the protected circuit during a 500W transient event, ensuring downstream components remain within safe operating limits.
Can SA24H be used in bidirectional applications?
No, SA24H is strictly unidirectional and lacks symmetrical breakdown characteristics. For bidirectional protection, Taiwan Semiconductor specifies CA-suffixed variants (e.g., SA24CA) or separate back-to-back configurations. Using SA24H in bidirectional mode risks failure during negative transients, as it does not conduct or clamp below –0.7V forward voltage.
What is the thermal derating behavior of SA24H above 25°C ambient?
SA24H's peak pulse power rating decreases linearly above TA = 25°C per Figure 2 in the datasheet, with full 500W capability only at 25°C. At 85°C ambient, its derated PPK drops to approximately 350W. Designers must apply this derating curve when sizing for under-hood environments where case temperatures exceed 75°C, especially when mounted on minimal copper area.
SA24H 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:
- 1
- Bidirectional Channels:
- -
- 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:
- -
- 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)
SA24H FAQ
1.How can I place an order for SA24H through Aetrix?
Please submit a Request for Quotation (RFQ) for SA24H 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 SA24H reliable?
The price and inventory of SA24H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA24H is usually 5 days.
3.What payment methods are accepted for SA24H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA24H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA24H?
SA24H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA24H 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 SA24H?
For technical support, including SA24H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA24H requirements.
6.How does Aetrix verify that SA24H is sourced from the original manufacturer or authorized distributors?
All SA24H 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 SA24H meets industry standards.
7.What is the process for return or replacement of SA24H?
All SA24H units undergo pre-shipment inspection (PSI). If there is an issue with SA24H, 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 SA24H part is unused and in its original packaging.
Return procedure for SA24H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SA24H Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
