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Vishay General Semiconductor - Diodes Division SA75A-E3/1
- Part No.:
- SA75A-E3/1
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA75A-E3/1.pdf
- Description:
- TVS DIODE 75VWM 121VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,213
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Product details
Overview
SA75A-E3/1 from Vishay General Semiconductor is a uni-directional Transient Voltage Suppressor (TVS) diode in DO-204AC (DO-15) package, designed for clamping voltage transients on power and signal lines. It features a 75 V stand-off voltage (VWM), 83.3–92.1 V breakdown voltage (VBR) at 1.0 mA, 121 V maximum clamping voltage (VC) at 4.1 A peak pulse current, and 500 W peak pulse power rating with 10/1000 µs waveform - used to protect MOSFETs, ICs, and sensor interfaces in industrial power supplies.
For engineers reviewing the SA75A-E3/1 datasheet, SA75A-E3/1 pinout, SA75A-E3/1 application, or SA75A-E3/1 equivalent, this page delivers verified electrical parameters, polarity marking guidance, thermal derating behavior, AEC-Q101 qualification status, and direct replacement options for overvoltage protection design validation.
Technical Context
The SA75A-E3/1 operates as a uni-directional avalanche diode with cathode-band polarity marking, optimized for fast transient suppression in DC power rails and low-speed signal paths. Its glass-passivated junction enables stable breakdown characteristics and low incremental surge resistance, while its 175 °C maximum junction temperature supports operation in high-ambient environments such as motor drives and industrial controllers.
It delivers 500 W peak pulse power per 10/1000 µs waveform at TA = 25 °C, with linear derating above 25 °C per Figure 2, and maintains ≤1.0 µA reverse leakage at VWM = 75 V. The device is rated for 70 A non-repetitive forward surge current (IFSM) and exhibits a +0.07 %/°C temperature coefficient of VBR, ensuring predictable clamping across temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 75 V - Maximum continuous reverse operating voltage before significant leakage; defines safe working margin below clamping threshold |
| VBR (min/max) | 83.3 V / 92.1 V at IT = 1.0 mA - Confirmed avalanche onset range; ensures reliable turn-on during transients without premature conduction |
| VC @ IPPM | 121 V at 4.1 A - Clamped voltage seen by protected circuit under 10/1000 µs surge; limits stress on downstream 100 V-rated components |
| PPPM | 500 W - Peak transient energy absorption capability; sufficient for IEC 61000-4-5 Level 3 (1 kV/2 Ω) surges |
| IFSM | 70 A - Single half-sine surge rating (8.3 ms); supports protection against inductive switch-off events in relay or solenoid circuits |
| TJ max. | 175 °C - Enables use in under-hood automotive modules or enclosed industrial enclosures without forced cooling |
| Leakage @ VWM | ≤1.0 µA - Minimal standby power loss and signal integrity impact in high-impedance sensor bias networks |
Pinout & Package
Package: DO-204AC (DO-15), axial-leaded, epoxy-molded case meeting UL 94 V-0 flammability rating. Matte tin-plated leads compliant with J-STD-002 and JESD 22-B102 solderability standards. Cathode identified by color band on body end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point during surge conduction | Connected to protected line side (e.g., VIN rail); must be routed with low-inductance path to ground reference |
| Cathode (banded end) | Reverse-biased terminal during normal operation; avalanche conduction node during overvoltage | Connected to system ground or low-impedance return plane; determines polarity-sensitive placement in DC circuits |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated chip junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity exposure |
| 500 W peak pulse power (10/1000 µs) | Provides robust immunity against lightning-induced surges and inductive kickback in 24 V/48 V industrial systems |
| AEC-Q101 qualified (E3 suffix variant) | Validated for automotive-grade reliability including temperature cycling, mechanical shock, and HTRB testing |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (<1 ns rise time), improving protection margin for sensitive logic |
| Solder dip 275 °C max., 10 s | Supports compatibility with lead-free reflow profiles and manual repair without delamination or parameter shift |
Applications
| Industrial Motor Drive Protection | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Suppresses inductive kickback from 24 V solenoid valves and brushed DC motors in PLC-controlled factory equipment. IC Role / Device Role / Timing Role: Uni-directional TVS placed between motor supply rail and chassis ground to clamp flyback spikes before they reach gate drivers or microcontrollers. Use Value: Limits transient voltage to ≤121 V, protecting 100 V-rated MOSFETs and preventing latch-up in 3.3 V/5 V logic interfaces tied to same ground plane. | Use Scenario: Shields LIN bus transceivers and microcontroller I/O pins from load dump and jump-start surges in vehicle door modules. IC Role / Device Role / Timing Role: Standoff-clamp TVS on 12 V supply input to BCM subassembly, operating in parallel with bulk capacitance and upstream fuse. Use Value: Withstands 70 A surge (8.3 ms) and clamps to 121 V, enabling compliance with ISO 7637-2 Pulse 5a (load dump) without derating external regulators. |
| Telecom Power Input Stage | Industrial Sensor Signal Conditioning |
Use Scenario: Protects AC/DC adapter secondary-side 48 V output against induced surges from nearby switching loads in telecom cabinets. IC Role / Device Role / Timing Role: Primary overvoltage clamp on regulated 48 V DC bus feeding PoE injectors and remote PHYs. Use Value: 500 W rating handles repetitive 10/1000 µs transients up to 0.01% duty cycle, maintaining stable bus voltage during multi-port surge events. | Use Scenario: Guards analog front-end inputs of 4–20 mA loop-powered sensors exposed to ESD and cable discharge in process automation. IC Role / Device Role / Timing Role: Low-leakage (≤1 µA) uni-directional TVS placed between sensor input and local ground, upstream of precision op-amp stages. Use Value: 75 V VWM allows full 24 V loop compliance while clamping ESD pulses to <121 V, preserving ADC reference stability and offset accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ75A | Same VWM (75 V), higher PPPM (600 W), SMC (DO-214AB) surface-mount package | Requires PCB redesign for SMD layout; better suited for automated assembly and higher-density boards | Select SMBJ75A when board space is constrained and reflow compatibility is required; not drop-in for through-hole SA75A-E3/1 |
| 1.5KE75A | Same VWM (75 V), identical DO-204AC package, but lower PPPM (1500 W peak, 1.5 kW) and higher VC (129 V) | Higher clamping voltage reduces protection margin for 100 V-rated devices; suitable only where surge energy is lower | Choose 1.5KE75A only if legacy design uses 1.5 kW rating and can tolerate 129 V clamping; verify thermal dissipation in same footprint |
Compared with SMBJ75A and 1.5KE75A, SA75A-E3/1 offers optimal balance of through-hole manufacturability, 500 W surge handling, and 121 V clamping - making it ideal for cost-sensitive industrial power entry designs where board-level surge coordination and serviceability matter.
Availability
SA75A-E3/1 is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and telecom power input stages requiring stable component supply, RoHS-compliant sourcing, and AEC-Q101-qualified reliability.
Supply support for SA75A-E3/1 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
Vishay General Semiconductor is a global supplier of discrete semiconductors, specializing in diodes, rectifiers, TVS devices, and optoelectronics with emphasis on reliability, efficiency, and application-specific performance.
The SAxxA series is part of Vishay's TRANSZORB® TVS family, engineered for robust transient suppression in harsh environments - targeting industrial automation, automotive subsystems, and infrastructure power systems where failure resilience is critical.
FAQ
What is the polarity configuration of SA75A-E3/1?
The SA75A-E3/1 is a uni-directional Transient Voltage Suppressor diode with cathode indicated by a color band on the body. During normal operation, it blocks reverse current up to 75 V; during overvoltage, it avalanches from cathode to anode. This polarity must be observed in PCB layout to ensure correct clamping direction on positive-rail applications - incorrect orientation renders SA75A-E3/1 ineffective for surge suppression.
Does SA75A-E3/1 meet automotive qualification standards?
Yes, the SA75A-E3/1 is AEC-Q101 qualified per Vishay documentation (Document Number: 88378, Revision: 18-Sep-12). This qualification covers stress tests including temperature cycling, high-temperature reverse bias, and unbiased highly accelerated stress testing - confirming suitability for automotive body electronics, infotainment power rails, and non-safety-critical control units where SA75A-E3/1 is deployed.
What is the maximum clamping voltage of SA75A-E3/1 under surge conditions?
The maximum clamping voltage (VC) of SA75A-E3/1 is 121 V at 4.1 A peak pulse current (IPPM) with a 10/1000 µs waveform. This value is measured per standard test conditions and defines the upper voltage limit imposed on protected circuitry during transient events - critical for ensuring downstream components like 100 V MOSFETs remain within safe operating area when SA75A-E3/1 activates.
Can SA75A-E3/1 be used in bi-directional protection circuits?
No, SA75A-E3/1 is strictly a uni-directional TVS diode and cannot provide symmetrical clamping for AC or bidirectional signal lines. For bi-directional applications such as RS-485 or CAN bus protection, the CA-suffix variant (e.g., SA75CA) must be used instead. Using SA75A-E3/1 in reverse-biased configurations risks permanent damage due to uncontrolled forward conduction beyond its 3.5 V forward voltage rating at 100 A.
What is the thermal derating behavior of SA75A-E3/1 above 25 °C ambient?
SA75A-E3/1 follows linear derating of peak pulse power (PPPM) above 25 °C ambient, per Figure 2 in Vishay Document 88378: at 75 °C ambient, PPPM drops to ~75% of rated 500 W (≈375 W); at 125 °C, it falls to ~40% (≈200 W). This behavior directly impacts surge survivability in enclosed enclosures - designers must verify worst-case ambient and airflow to ensure SA75A-E3/1 retains sufficient margin for specified threat levels.
SA75A-E3/1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-204AC, DO-15, Axial
- Series:
- TransZorb®
- Packaging:
- Bulk
- Product Status:
- Obsolete
- 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):
- 4.1A
- 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-E3/1 FAQ
1.How can I place an order for SA75A-E3/1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SA75A-E3/1 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-E3/1 reliable?
The price and inventory of SA75A-E3/1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA75A-E3/1 is usually 5 days.
3.What payment methods are accepted for SA75A-E3/1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA75A-E3/1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA75A-E3/1?
SA75A-E3/1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA75A-E3/1 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-E3/1?
For technical support, including SA75A-E3/1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA75A-E3/1 requirements.
6.How does Aetrix verify that SA75A-E3/1 is sourced from the original manufacturer or authorized distributors?
All SA75A-E3/1 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-E3/1 meets industry standards.
7.What is the process for return or replacement of SA75A-E3/1?
All SA75A-E3/1 units undergo pre-shipment inspection (PSI). If there is an issue with SA75A-E3/1, 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-E3/1 part is unused and in its original packaging.
Return procedure for SA75A-E3/1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SA75A-E3/1 Tags
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