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Taiwan Semiconductor Corporation SA7.5A
- Part No.:
- SA7.5A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA7.5A.pdf
- Description:
- TVS DIODE 7.5VWM 12.9VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,263
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Product details
Overview
SA7.5A from Taiwan Semiconductor is a unidirectional 500W transient voltage suppressor (TVS) diode in DO-204AC (DO-15) package, with 7.5V working stand-off voltage, 8.33–9.21V breakdown voltage at 1mA test current, 40A peak pulse current, and 12.9V clamping voltage at rated surge. It protects automotive and industrial power rails against ESD, EFT, and inductive switching transients.
For engineers reviewing the SA7.5A datasheet, SA7.5A pinout, SA7.5A application, or SA7.5A equivalent, this page delivers verified electrical parameters, polarity-aware package details, real-world clamping performance under 10/1000μs surge, and AEC-Q101-comparable alternatives for automotive-grade circuit protection design.
Technical Context
The SA7.5A operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its VBR range (8.33–9.21V), clamping transients to ≤12.9V at 40A IPPM. Its low leakage (<1μA @ 7.5V) ensures minimal standby power loss in always-on systems.
Designed for single-polarity DC rail protection, it features fast response (<1.0ps from 0V to VBR), 175°C max junction temperature, and UL 94V-0 molded compound - enabling use in under-hood automotive modules and industrial PLC I/O stages where thermal margin and flammability compliance are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 7.5V - Maximum continuous reverse operating voltage before conduction begins |
| VBR min/max | 8.33V / 9.21V at 1mA - Confirmed breakdown threshold range for reliable trigger consistency |
| VC @ IPPM | 12.9V at 40A - Clamped voltage during full 500W 10/1000μs surge, limiting downstream stress |
| PPK | 500W - Peak pulse power rating per standard 10/1000μs waveform |
| IR @ VWM | <1μA - Reverse leakage ensuring negligible quiescent current in battery-powered systems |
| TJ max | +175°C - Enables placement near hot components like power MOSFETs or motor drivers |
| Package | DO-204AC (DO-15) - Industry-standard axial leaded package with tin-plated leads per J-STD-002 |
Pinout & Package
DO-204AC (DO-15) package with axial leads: cathode indicated by band marking; anode and cathode terminals defined per polarity-sensitive TVS operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | DC return path / ground reference | Connected to system ground or low-side return; completes conduction path during transient clamp |
| Cathode | Protected line input | Connected to the rail being protected (e.g., +12V supply); carries surge current into ground via anode during overvoltage event |
Key Features
| Feature | Design Value |
|---|---|
| Unidirectional clamping | Enables precise protection of positive DC rails without affecting forward-biased operation or signal integrity |
| AEC-Q101 qualification option (SA7.5AH) | Validated for automotive under-hood environments including temperature cycling, humidity, and mechanical shock |
| 12.9V clamping at 40A | Ensures downstream ICs rated for 13.2V absolute maximum survive ISO 7637-2 Pulse 1/2a/5a transients |
| <1.0ps response time | Clamps ESD events before sensitive gate oxides or interface pins experience overstress |
| UL 94V-0 molding compound | Meets flame-retardancy requirements for enclosed industrial enclosures and automotive junction boxes |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12V battery-fed ECUs from load dump and alternator ripple transients per ISO 7637-2. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and input filter capacitor, shunting surges to chassis ground. Use Value: Limits clamped voltage to 12.9V, preserving 13.2V-rated PMICs and microcontrollers without derating. | Use Scenario: Safeguarding 5V/24V analog sensor inputs (e.g., pressure, temperature) from EFT bursts in factory automation. IC Role / Device Role / Timing Role: Front-end TVS on sensor cable entry point, absorbing 4kV EFT pulses before signal conditioning amplifiers. Use Value: Sub-1ns response prevents latch-up in op-amps; <1μA leakage avoids offset drift in precision measurement paths. |
| LED Driver Overvoltage Clamp | PLC Digital Input Stage Protection |
Use Scenario: Preventing catastrophic failure of constant-current LED drivers due to inductive kickback from relay coils or solenoids. IC Role / Device Role / Timing Role: TVS connected across driver output terminals, conducting flyback energy during switch-off transitions. Use Value: 500W surge rating handles repetitive 100ms inductive spikes; DO-15 package allows through-hole mounting on high-current PCB traces. | Use Scenario: Hardening 24V digital input channels on programmable logic controllers against field-wiring transients and miswiring events. IC Role / Device Role / Timing Role: Primary protection device upstream of optocoupler or Schmitt-trigger input stage. Use Value: 7.5V VWM matches common 24V logic thresholds; 12.9V VC ensures optocoupler CTR remains stable during clamping. |
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 SMAJ7.5A | Same DO-214AC package, identical VWM/VBR/VC specs; 500W rating; RoHS/halogen-free compliant | No AEC-Q101 variant offered; limited automotive qualification documentation | Preferred for cost-sensitive industrial designs where AEC-Q101 is not mandated |
| ON Semiconductor 1.5SMC7.5A | DO-214AB package (larger footprint); same electrical specs but higher thermal resistance (RθJA = 50°C/W vs. DO-15's ~40°C/W) | Suitable for lower-density boards; less optimal for thermally constrained automotive modules | Select when existing layout uses SMC footprint or when higher surge repetition rate requires larger thermal mass |
Compared with SMAJ7.5A and 1.5SMC7.5A, the SA7.5A offers direct AEC-Q101 qualification path and superior thermal performance in the compact DO-15 form factor - making it optimal for space-constrained, high-reliability automotive body control modules.
Availability
SA7.5A is available at Aetrix Electronics and suitable for automotive ECU protection, industrial sensor interface hardening, and LED driver overvoltage clamp applications requiring stable component supply and traceable sourcing.
Supply support for SA7.5A 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 Company (TSC) is a vertically integrated semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and thyristors for automotive, industrial, and consumer markets.
The SA Series was developed specifically for robust, high-energy transient suppression in harsh environments - emphasizing low clamping voltage, AEC-Q101 readiness, and consistent DO-15 manufacturability for Tier 1 automotive suppliers.
FAQ
What is the maximum clamping voltage of the SA7.5A under full-rated surge conditions?
The SA7.5A has a maximum clamping voltage (VC) of 12.9V at 40A peak pulse current (IPPM), measured under the standard 10/1000μs waveform. This value is guaranteed across the full operating temperature range and ensures downstream components with 13.2V absolute maximum ratings remain within safe operating limits during transient events.
Is the SA7.5A unidirectional or bidirectional, and how is polarity identified?
The SA7.5A 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 end connects to ground. Bidirectional variants use "CA" suffix (e.g., SA7.5CA), which SA7.5A does not carry.
Does the SA7.5A meet AEC-Q101 reliability standards?
The base SA7.5A is not AEC-Q101 qualified; however, the SA7.5AH variant (ordering code SA7.5AH) is explicitly qualified per AEC-Q101 Rev D. Both share identical electrical specifications, but only SA7.5AH undergoes stress testing for temperature cycling, HTRB, and mechanical shock required for automotive under-hood deployment.
What is the reverse leakage current of the SA7.5A at its working stand-off voltage?
At its 7.5V working stand-off voltage (VWM), the SA7.5A exhibits a maximum reverse leakage current (IR) of 1μA at 25°C. This ultra-low leakage preserves battery life in always-on automotive modules and avoids loading errors in high-impedance sensor bias networks.
Can the SA7.5A be used in place of the SA7.5 part number?
No - SA7.5 and SA7.5A are distinct variants. SA7.5 has higher clamping voltage (14.3V vs. 12.9V) and lower peak pulse current (36A vs. 40A). The "A" suffix denotes improved clamping performance and tighter VBR tolerance (8.33–9.21V vs. 8.33–10.20V), making SA7.5A preferable for designs requiring stricter voltage limiting.
SA7.5A 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):
- 7.5V
- Voltage - Breakdown (Min):
- 8.33V
- Voltage - Clamping (Max) @ Ipp:
- 12.9V
- Current - Peak Pulse (10/1000µs):
- 40A
- Power - Peak Pulse:
- 500W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AC (DO-15)
SA7.5A FAQ
1.How can I place an order for SA7.5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SA7.5A 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 SA7.5A reliable?
The price and inventory of SA7.5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA7.5A is usually 5 days.
3.What payment methods are accepted for SA7.5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA7.5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA7.5A?
SA7.5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA7.5A 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 SA7.5A?
For technical support, including SA7.5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA7.5A requirements.
6.How does Aetrix verify that SA7.5A is sourced from the original manufacturer or authorized distributors?
All SA7.5A 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 SA7.5A meets industry standards.
7.What is the process for return or replacement of SA7.5A?
All SA7.5A units undergo pre-shipment inspection (PSI). If there is an issue with SA7.5A, 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 SA7.5A part is unused and in its original packaging.
Return procedure for SA7.5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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