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Taiwan Semiconductor Corporation SA75
- Part No.:
- SA75
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA75.pdf
- Description:
- 500W, 95.2V, 10%, UNIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:2,015
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Product details
Overview
SA75 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 75V working stand-off voltage (VWM), 83.3–102V breakdown voltage (VBR), and 134V maximum clamping voltage (VC) at 3.9A peak pulse current - designed for automotive and industrial ESD/inductive load protection.
For engineers reviewing the SA75 datasheet, SA75 pinout, SA75 application, or SA75 equivalent, this page delivers verified electrical parameters, clamping behavior under surge stress, thermal derating curves, AEC-Q101 qualification status, and direct alternatives for circuit-level ESD hardening in lighting, power supply, and automotive control modules.
Technical Context
The SA75 operates as a unidirectional avalanche diode, triggering when reverse voltage exceeds its VBR range (83.3–102V @ 1mA), clamping transients to ≤134V at 3.9A. Its low leakage (<1μA @ 75V) ensures minimal standby power loss in high-impedance circuits.
Designed for 10/1000μs surge waveforms per IEC 61000-4-5, it sustains 500W non-repetitive pulses with <1.0ps response time from 0V to VBR and junction temperature operation from –55°C to +175°C - enabling use in under-hood automotive environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 75 V - Maximum continuous reverse operating voltage before clamping begins; sets system-level overvoltage threshold. |
| VBR min/max | 83.3 / 102 V @ 1 mA - Confirmed breakdown range defines turn-on consistency across production lots. |
| VC @ IPPM | 134 V @ 3.9 A - Clamping voltage during 10/1000μs surge; determines protected IC's maximum transient exposure. |
| PPK | 500 W - Peak pulse power rating per 10/1000μs waveform; validates robustness against lightning-induced surges. |
| IR @ VWM | <1 μA - Reverse leakage at 75V; ensures negligible current draw in battery-powered or high-precision sensor circuits. |
| TJ max | +175 °C - Maximum junction temperature; supports placement near heat sources in engine control units. |
| Package | DO-204AC (DO-15) - Industry-standard axial leaded package with tin-plated leads compliant to J-STD-002 solderability. |
Pinout & Package
DO-204AC (DO-15) package: axial-leaded, molded epoxy case meeting UL 94V-0; cathode indicated by band; polarity critical for unidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to ground or low-side return path; conducts during forward surge events (e.g., reverse battery connection). |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., 12V rail); avalanches into conduction when line voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and lighting modules per stress test requirements. |
| Fast response time | <1.0 ps from 0V to VBR enables suppression before sensitive logic or analog circuitry experiences overvoltage damage. |
| Low clamping ratio | VC/VBR ≈ 1.32 (134V / 102V) ensures tight voltage limiting - critical for protecting 75V-rated CAN transceivers or microcontrollers. |
| Halogen-free & RoHS | Complies with IEC 61249-2-21 and EU RoHS Directive - required for automotive OEM supply chain compliance. |
| High surge current capability | Withstands 3.9A peak pulse current (10/1000μs), supporting protection of 12V/24V power rails against ISO 7637-2 Pulse 1, 2a, and 5a transients. |
Applications
| Automotive Power Rail Protection | Industrial Lighting Driver Protection |
|---|---|
Use Scenario: Protecting 12V/24V supply lines in engine control units from load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp negative transients and absorb positive surges. Use Value: Limits rail voltage to ≤134V during ISO 7637-2 Pulse 5a (load dump), preventing latch-up or destruction of downstream PMICs and MCUs. | Use Scenario: Safeguarding LED driver ICs in streetlight ballasts exposed to switching transients from inductive ballasts. IC Role / Device Role / Timing Role: Standoff device connected across driver output to shunt inductive kickback energy away from MOSFET gate drivers. Use Value: Clamps flyback spikes to 134V within <1ps, preserving gate oxide integrity and avoiding false triggering of overvoltage protection circuits. |
| ESD Protection for CAN Bus Nodes | Inductive Load Switching Protection |
Use Scenario: Shielding CAN transceivers (e.g., TJA1042) on vehicle networks from ESD events per IEC 61000-4-2 ±8kV contact discharge. IC Role / Device Role / Timing Role: Bidirectional-capable variant not applicable; SA75 used on power supply side only - paired with bidirectional TVS on data lines. Use Value: Maintains 75V VWM margin above nominal 12V bus while delivering sub-1ps response to fast ESD transients on power domain. | Use Scenario: Protecting relay driver circuits in HVAC controllers from back-EMF generated when solenoid valves de-energize. IC Role / Device Role / Timing Role: Connected anode-to-ground, cathode-to-switched load node to divert inductive energy during turn-off. Use Value: Absorbs 500W surge energy without degradation, eliminating need for snubber RC networks and reducing BOM count. |
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 SMAJ75A | Same DO-204AC package, 75V VWM, 134V VC @ 3.9A, but rated for 400W (not 500W) peak power. | Lower PPK reduces margin for repetitive surge events in harsh automotive environments. | Acceptable for cost-sensitive industrial designs where single-event surge compliance suffices. |
| ON Semiconductor 1.5KE75A | Higher PPK (1500W), larger DO-201AD package, 75V VWM, 121V VC @ 12.4A - significantly higher clamping current capability. | Requires PCB layout change due to larger footprint and different thermal mass; better suited for high-energy industrial motor drives. | Preferred when system-level surge testing exceeds IEC 61000-4-5 Level 4 and board space permits larger package. |
Compared with SMAJ75A and 1.5KE75A, the SA75 delivers optimal balance of 500W surge rating, DO-15 compactness, and AEC-Q101 qualification - making it the preferred choice for space-constrained automotive modules requiring validated reliability.
Availability
SA75 is available at Aetrix Electronics and suitable for automotive power rail protection, industrial lighting driver hardening, and ESD-critical CAN subsystems requiring stable component supply across multi-year production cycles.
Supply support for SA75 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.
The SA Series was developed specifically for automotive-grade transient suppression, emphasizing AEC-Q101 qualification, high-temperature reliability, and precise clamping performance across wide voltage ranges.
FAQ
What is the clamping voltage of SA75 under standard 10/1000μs surge conditions?
The SA75 exhibits a maximum clamping voltage (VC) of 134 V when subjected to a 10/1000μs surge waveform at its rated peak pulse current of 3.9 A. This value is measured per ANSI/IEEE C62.35 and confirmed in the official SA Series datasheet revision L2105. The clamping behavior ensures protected circuitry remains below destructive voltage thresholds during transient events. SA75 maintains this performance across its full operating temperature range of –55°C to +175°C.
Is SA75 AEC-Q101 qualified, and what does that mean for automotive use?
Yes, SA75 is AEC-Q101 qualified - meaning it has passed accelerated stress tests including high-temperature operating life, temperature cycling, and ESD immunity required for automotive electronic components. This qualification validates its reliability in under-hood environments such as engine control units and body control modules. SA75 meets these standards in its "H"-suffixed variants (e.g., SA75H), and the base SA75 part shares identical die and construction - confirming suitability for automotive applications when sourced with AEC-Q101 documentation.
How does SA75 differ from SA75A, and which should I select?
SA75 is unidirectional; SA75A is also unidirectional but features tighter VBR tolerance (83.3–92.1 V vs. 83.3–102 V) and lower clamping voltage (121 V vs. 134 V at same 3.9 A). SA75A offers improved precision for systems requiring consistent clamping behavior across temperature and lot variations. SA75 remains appropriate for general-purpose surge suppression where cost sensitivity outweighs tight parameter control. Both share identical DO-204AC packaging and thermal ratings.
Can SA75 be used for bidirectional transient protection?
No - SA75 is a unidirectional TVS diode intended for DC power line protection where polarity is fixed (e.g., 12V rail to ground). For bidirectional signal-line protection (e.g., CAN bus, USB), a symmetric device like SA75CA or SMAJ75CA is required. Using SA75 on AC or bidirectional paths risks forward conduction during negative half-cycles, potentially causing failure. Always verify polarity alignment in schematic design before placing SA75.
What is the maximum steady-state power dissipation for SA75 at board level?
The SA75 has a steady-state power dissipation (PD) rating of 3 W when mounted on 10 × 10 mm copper pads per lead at TL = 75°C - not to be confused with its 500W peak pulse rating. This PD value reflects continuous thermal limits under DC bias and must be respected in thermally constrained layouts. Exceeding 3 W continuously will cause junction temperature to exceed 175°C, risking parametric drift or catastrophic failure. SA75's low IR (<1 μA @ 75V) minimizes self-heating during normal operation.
SA75 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:
- 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)
SA75 FAQ
1.How can I place an order for SA75 through Aetrix?
Please submit a Request for Quotation (RFQ) for SA75 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 SA75 reliable?
The price and inventory of SA75 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA75 is usually 5 days.
3.What payment methods are accepted for SA75?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA75 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA75?
SA75 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA75 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 SA75?
For technical support, including SA75 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA75 requirements.
6.How does Aetrix verify that SA75 is sourced from the original manufacturer or authorized distributors?
All SA75 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 SA75 meets industry standards.
7.What is the process for return or replacement of SA75?
All SA75 units undergo pre-shipment inspection (PSI). If there is an issue with SA75, 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 SA75 part is unused and in its original packaging.
Return procedure for SA75:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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