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Taiwan Semiconductor Corporation SA75H
- Part No.:
- SA75H
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA75H.pdf
- Description:
- 500W, 95.2V, 10%, UNIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:8,916
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Product details
Overview
SA75H from Taiwan Semiconductor is a unidirectional 75V transient voltage suppressor (TVS) diode in DO-204AC (DO-15) package, rated for 500W peak pulse power at 10/1000μs, with 83.3–102V breakdown voltage (VBR), 134V clamping voltage (VC) at 3.9A, and <1μA reverse leakage at 75V - deployed for automotive ECU power rail surge protection per AEC-Q101.
For engineers reviewing the SA75H datasheet, SA75H pinout, SA75H application, or SA75H equivalent, key selection criteria include its AEC-Q101 qualification, 175°C max junction temperature, DO-15 mechanical compatibility, and verified clamping performance under ISO 7637-2 Pulse 1/2a/5a transients.
Technical Context
The SA75H operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its VBR range of 83.3–102V at 1mA test current; it clamps transient energy to ≤134V at 3.9A peak pulse current (IPPM), delivering low-impedance surge path with <1.0ps response time from 0V to VBR.
Its thermal design supports continuous operation up to TJ = 175°C, with steady-state power dissipation of 3W at 75°C lead temperature, and meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements - confirming suitability for under-hood automotive environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 75 V - maximum continuous reverse operating voltage before conduction begins |
| VBR min/max | 83.3 V / 102 V at 1 mA - ensures reliable turn-on above system nominal rail while avoiding false triggering |
| VC @ IPPM | 134 V at 3.9 A - limits downstream IC voltage stress during 10/1000μs surges |
| PPK | 500 W - sustains single high-energy transients without failure per IEC 61000-4-5 Level 4 |
| IR @ VWM | <1 μA - negligible standby leakage, preserving battery life in always-on automotive modules |
| TJ max | 175 °C - enables placement near heat sources (e.g., power converters) in engine control units |
| Package | DO-204AC (DO-15) - industry-standard axial leaded form factor compatible with legacy PCB layouts |
Pinout & Package
DO-204AC (DO-15) package with axial leads: cathode indicated by band marking; anode and cathode terminals support through-hole mounting on 10×10 mm copper pads per JEDEC standard for optimal thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Reverse surge return path | Connected to ground or low-impedance return plane to complete clamping loop during transients |
| Cathode | Reverse voltage sensing / Clamping output node | Connected to protected line (e.g., 12V supply rail); conducts when VAK > VBR to shunt surge energy |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and ADAS power domains |
| 500W peak pulse rating | Withstands ISO 7637-2 Pulse 5a (50V, 100ms) and IEC 61000-4-5 Combination Wave (4kV) without degradation |
| <1.0ps response time | Clamps sub-nanosecond ESD events (e.g., HBM >8kV) before sensitive logic inputs are damaged |
| UL 94V-0 molding compound | Prevents flame propagation in high-temp under-hood environments per automotive safety standards |
| Lead-free, RoHS & halogen-free | Complies with EU ELV Directive and JIS C 0950 for sustainable vehicle manufacturing |
Applications
| Automotive Power Rail Protection | Industrial PLC Input Protection |
|---|---|
Use Scenario: Protecting 12V/24V supply lines in engine control units against load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between power rail and chassis ground to clamp surges above 75V. Use Value: Limits rail voltage to ≤134V during 120V/400ms load dump events, preventing damage to MCU, CAN transceivers, and sensor interfaces. | Use Scenario: Safeguarding digital input channels of programmable logic controllers from field-induced transients. IC Role / Device Role / Timing Role: Standoff protector on 24V DC input terminals, absorbing fast-rising spikes from relay coil switching. Use Value: Suppresses 1kV/50ns EFT bursts per IEC 61000-4-4 Level 4 without signal interruption or firmware reset. |
| LED Lighting Driver Protection | Automotive Sensor Interface Protection |
Use Scenario: Shielding constant-current LED drivers in headlamp modules from ignition noise and PWM coupling. IC Role / Device Role / Timing Role: Parallel-connected TVS on driver output to clamp inductive kickback from LED string disconnection. Use Value: Prevents gate oxide rupture in MOSFET drivers by limiting voltage overshoot to 134V during 3.9A surge events. | Use Scenario: Securing analog outputs of pressure/temperature sensors connected to vehicle battery rails. IC Role / Device Role / Timing Role: Low-leakage (≤1μA) standoff device ensuring minimal offset error in precision ratiometric sensor circuits. Use Value: Maintains ADC reference integrity during cold-crank (4.5V) and load-dump (120V) conditions without bias current injection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ75A | Same 75V VWM, but bidirectional; 100W lower PPK (400W); SMA package (SMT) | Requires PCB redesign for surface-mount; unsuitable for unidirectional-only circuits needing polarity enforcement | Select only if board space constraints mandate SMT and bidirectional protection is acceptable |
| 1.5KE75A | Same DO-15 package and unidirectional function; 1.5kW PPK; higher VC (129V); no AEC-Q101 qualification | Lacks automotive reliability validation; higher clamping increases risk to 3.3V/5V logic downstream | Acceptable for industrial non-automotive use where cost outweighs qualification requirements |
Compared with SMAJ75A and 1.5KE75A, the SA75H delivers AEC-Q101 assurance, precise 134V clamping at 3.9A, and optimized thermal performance in DO-15 - making it the preferred choice for automotive-grade 75V rail protection where qualification, consistency, and layout continuity are critical.
Availability
SA75H is available at Aetrix Electronics and suitable for automotive electronic control units, industrial programmable logic controllers, LED lighting systems, and sensor interface modules requiring stable component supply across extended production lifecycles.
Supply support for SA75H 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 for automotive, industrial, and consumer markets.
The SA Series was developed specifically for AEC-Q101-compliant transient suppression in harsh automotive environments, emphasizing robust clamping, low leakage, and high-temperature reliability in axial-leaded packages.
FAQ
What is the clamping voltage of the SA75H under standard 10/1000μs surge conditions?
The SA75H has a maximum clamping voltage (VC) of 134 V at 3.9 A peak pulse current (IPPM) under the 10/1000μs waveform. This value is measured per ANSI/IEEE C62.35 and ensures predictable overvoltage limiting for protected downstream circuitry - a critical parameter confirmed in the SA75H datasheet Table on page 4.
Is the SA75H unidirectional or bidirectional, and how is polarity identified?
The SA75H is a unidirectional TVS diode. Polarity is marked by a cathode band on the DO-204AC (DO-15) package body; the banded end connects to the protected line (e.g., 12V rail), while the unbanded anode connects to ground. Bidirectional variants in the SA series use "CA" suffixes (e.g., SA75CA), not "H".
Does the SA75H meet automotive qualification standards?
Yes, the "H" suffix in SA75H explicitly denotes AEC-Q101 qualification per the manufacturer's Ordering Information table (Page 5). This includes stress testing for temperature cycling, humidity, mechanical shock, and high-temperature operating life - validating its use in engine control, body electronics, and ADAS subsystems.
What is the maximum junction temperature rating for the SA75H?
The SA75H has a maximum junction temperature (TJ) rating of +175°C, as specified in the Absolute Maximum Ratings table. This allows reliable operation in under-hood environments where ambient temperatures exceed 125°C, provided PCB thermal design meets the 10×10 mm copper pad requirement per JEDEC.
How does the SA75H compare to the SA75A variant?
The SA75H and SA75A share identical electrical parameters (VWM = 75 V, VBR = 83.3–102 V, VC = 134 V), but only the SA75H carries AEC-Q101 qualification. The SA75A is intended for industrial/commercial applications; both use DO-204AC packaging and have the same 500W peak pulse rating.
SA75H 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):
- 75V
- Voltage - Breakdown (Min):
- 83.3V
- Voltage - Clamping (Max) @ Ipp:
- 134V
- Current - Peak Pulse (10/1000µs):
- 3.9A
- 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)
SA75H FAQ
1.How can I place an order for SA75H through Aetrix?
Please submit a Request for Quotation (RFQ) for SA75H 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 SA75H reliable?
The price and inventory of SA75H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA75H is usually 5 days.
3.What payment methods are accepted for SA75H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA75H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA75H?
SA75H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA75H 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 SA75H?
For technical support, including SA75H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA75H requirements.
6.How does Aetrix verify that SA75H is sourced from the original manufacturer or authorized distributors?
All SA75H 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 SA75H meets industry standards.
7.What is the process for return or replacement of SA75H?
All SA75H units undergo pre-shipment inspection (PSI). If there is an issue with SA75H, 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 SA75H part is unused and in its original packaging.
Return procedure for SA75H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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