My Inquiry
My Account
Taiwan Semiconductor Corporation SA75A
- Part No.:
- SA75A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA75A.pdf
- Description:
- TVS DIODE 75VWM 121VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,589
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SA75A 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, 75V working stand-off voltage, and clamping voltage of 121V at 4.3A peak pulse current. It protects automotive and industrial power rails against ESD and inductive switching transients.
For engineers reviewing the SA75A datasheet, SA75A pinout, SA75A application, or SA75A equivalent, key selection criteria include its 75V VWM, 83.3–92.1V VBR range at 1mA, <1μA reverse leakage above 10V, AEC-Q101 qualification option (SA75AH), and DO-15 mechanical compatibility with legacy through-hole PCB layouts.
Technical Context
The SA75A operates as a unidirectional avalanche diode, triggering when reverse voltage exceeds its breakdown threshold (83.3–92.1V at 1mA). Its low dynamic impedance ensures rapid clamping response (<1.0ps rise time from 0V to VBR), limiting transient energy delivered to downstream circuitry.
Designed for single-polarity DC rail protection, it sustains 175°C junction temperature and meets JESD201 Class 2 whisker resistance. The device exhibits a 91mV/°C temperature coefficient on VBR and maintains <1μA IR at 75V - critical for low-power standby circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 75 V - maximum continuous reverse operating voltage before conduction begins |
| VBR min/max | 83.3 / 92.1 V at 1 mA - guaranteed avalanche initiation window for reliable overvoltage detection |
| VC @ IPPM | 121 V at 4.3 A - clamped voltage during 10/1000μs surge, defining worst-case stress on protected IC |
| PPK | 500 W - peak pulse power handling per ANSI/IEEE C62.35 10/1000μs waveform |
| IR @ VWM | <1 μA - negligible standby current draw, preserving battery life in always-on systems |
| TJ max | +175 °C - enables under-hood automotive deployment without derating in high-ambient environments |
| Package | DO-204AC (DO-15) - industry-standard axial leaded package with 0.400g mass and UL 94V-0 molding compound |
Pinout & Package
DO-204AC (DO-15) package with axial leads: cathode identified by band marking; anode and cathode terminals support through-hole mounting on 10×10 mm copper pads per lead for rated 3W steady-state dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Reverse voltage reference node | Connected to ground or low-side return path; defines polarity-sensitive placement in DC rail protection |
| Cathode | Avalanche conduction output / Clamping node | Connected to protected line (e.g., 75V supply rail); carries full surge current during transient events |
Key Features
| Feature | Design Value |
|---|---|
| Unidirectional clamping architecture | Enables precise DC rail protection without bidirectional leakage paths that compromise signal integrity |
| Sub-1.0ps VBR response time | Prevents nanosecond-scale ESD pulses from propagating past the device into sensitive analog or logic inputs |
| AEC-Q101 qualified variant (SA75AH) | Validated for automotive powertrain and body electronics applications requiring zero defect reliability |
| Halogen-free & RoHS-compliant construction | Meets IEC 61249-2-21 and global environmental compliance mandates for industrial and consumer end equipment |
| JESD201 Class 2 whisker resistance | Eliminates tin whisker growth risk in long-life deployments such as telecom infrastructure and medical power supplies |
Applications
| Automotive Power Rail Protection | Industrial PLC Input Protection |
|---|---|
Use Scenario: 12V/24V battery-supplied ECUs exposed to load dump and alternator ripple transients. IC Role / Device Role / Timing Role: Primary clamping element placed directly at connector entry point to shunt >500W surges before reaching MCU power pins. Use Value: Limits rail voltage to ≤121V during 10/1000μs transients, preventing brownout resets and gate oxide damage in 3.3V/5V logic. | Use Scenario: 24V digital input modules receiving signals from field sensors subject to inductive kickback. IC Role / Device Role / Timing Role: Front-end transient absorber on isolated input channel, coordinated with optocoupler input stage. Use Value: Absorbs up to 4.3A surge current while maintaining <1μA leakage, ensuring accurate low-current sensing during normal operation. |
| LED Driver Overvoltage Clamp | DC Power Supply Output Protection |
Use Scenario: Constant-current LED drivers in street lighting subjected to lightning-induced surges on AC mains input. IC Role / Device Role / Timing Role: Secondary-level clamp on DC bus after bridge rectifier and bulk capacitor, protecting MOSFET switches and current sense resistors. Use Value: Clamps 75V nominal bus to 121V during surge, avoiding overvoltage failure of 100V-rated FETs and enabling use of cost-optimized components. | Use Scenario: 75V programmable DC bench supplies where output must remain stable during accidental short-circuit recovery transients. IC Role / Device Role / Timing Role: Output-stage TVS placed between regulator output and load connector, absorbing reflected energy during cable disconnect events. Use Value: Withstands repeated 500W pulses without degradation, ensuring long-term reliability in test equipment with frequent load changes. |
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 | Identical DO-204AC package, same 75V VWM and 121V [email protected], but rated for 400W PPK (vs. SA75A's 500W) | Suitable for lower-energy surge environments; not recommended for AEC-Q101 automotive use without requalification | Select SMAJ75A only if system-level testing confirms 400W margin is sufficient and AEC-Q101 is not required |
| ON Semiconductor 1.5SMC75A | Same VWM/VC specs and DO-204AC package, but higher IR (5μA vs. SA75A's <1μA) and no AEC-Q101 option | Better suited for cost-sensitive industrial controls where ultra-low leakage is non-critical | Choose 1.5SMC75A for non-battery-powered systems where standby current is not constrained |
Compared with SMAJ75A and 1.5SMC75A, the SA75A delivers higher 500W surge rating and sub-1μA leakage - critical for automotive and battery-backed applications - while sharing identical DO-15 footprint and clamping performance at 75V rails.
Availability
SA75A is available at Aetrix Electronics and suitable for automotive ECU protection, industrial PLC input conditioning, and LED driver overvoltage clamping requiring stable component supply across multi-year production cycles.
Supply support for SA75A 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, and rectifiers with ISO/TS 16949 certification.
The SA Series was developed specifically for robust transient suppression in automotive and industrial environments, emphasizing AEC-Q101 qualification, high-temperature operation, and tight parametric consistency across voltage grades.
FAQ
What is the maximum clamping voltage of SA75A during a standard 10/1000μs surge event?
The SA75A clamps to a maximum of 121 V when subjected to its rated peak pulse current of 4.3 A under the 10/1000μs waveform defined in ANSI/IEEE C62.35. This value is measured at TA = 25°C and represents the worst-case voltage imposed on protected circuitry during surge conditions. The SA75A datasheet specifies this parameter in the "Maximum clamping voltage VC@IPPM" row of the electrical characteristics table.
Is SA75A unidirectional or bidirectional, and how is polarity marked?
The SA75A is a unidirectional TVS diode, designed for DC rail protection where polarity is fixed. Polarity is indicated by a cathode band on the DO-204AC (DO-15) package body - the banded end connects to the protected line (e.g., 75V supply), while the unbanded end connects to ground. Bidirectional variants in the SA series use "CA" suffixes (e.g., SA75CA), which SA75A does not carry.
Does SA75A meet automotive reliability standards?
The base SA75A part is not AEC-Q101 qualified; however, the SA75AH variant - identical in all electrical and mechanical specifications except for extended reliability testing - is fully AEC-Q101 qualified. SA75AH undergoes stress testing including temperature cycling, HTRB, and ESD per AEC-Q101 Rev D, making it suitable for automotive powertrain and body control modules.
What is the reverse leakage current of SA75A at its full working voltage?
At its rated working stand-off voltage of 75 V and TA = 25°C, the SA75A exhibits a maximum reverse leakage current (IR) of 1 μA. This ultra-low leakage supports battery-powered and energy-sensitive applications, such as always-on automotive modules or low-power industrial sensors, where standby current must be minimized to extend operational lifetime.
Can SA75A be used in place of SA75 without design changes?
Yes - SA75A and SA75 share identical DO-204AC (DO-15) packaging, pinout, and thermal/mechanical dimensions. Electrically, SA75A offers tighter VBR tolerance (83.3–92.1 V vs. SA75's 83.3–102 V) and lower clamping voltage (121 V vs. 134 V), resulting in improved protection margin. No PCB layout or schematic changes are needed for drop-in replacement, though system-level surge testing is recommended to validate enhanced clamping performance.
SA75A 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:
- 121V
- Current - Peak Pulse (10/1000µs):
- 4.3A
- 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)
SA75A FAQ
1.How can I place an order for SA75A through Aetrix?
Please submit a Request for Quotation (RFQ) for SA75A 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 SA75A reliable?
The price and inventory of SA75A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA75A is usually 5 days.
3.What payment methods are accepted for SA75A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA75A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA75A?
SA75A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA75A 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 SA75A?
For technical support, including SA75A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA75A requirements.
6.How does Aetrix verify that SA75A is sourced from the original manufacturer or authorized distributors?
All SA75A 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 SA75A meets industry standards.
7.What is the process for return or replacement of SA75A?
All SA75A units undergo pre-shipment inspection (PSI). If there is an issue with SA75A, 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 SA75A part is unused and in its original packaging.
Return procedure for SA75A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SA75A 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…
