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Vishay General Semiconductor - Diodes Division SA75A-E3/73
- Part No.:
- SA75A-E3/73
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA75A-E3/73.pdf
- Description:
- TVS DIODE 75VWM 121VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,688
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Product details
Overview
SA75A-E3/73 from Vishay General Semiconductor is a unidirectional Transient Voltage Suppressor (TVS) diode in DO-15 package, designed for clamping voltage transients on power and signal lines. It features 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 in automotive ECUs, industrial I/O protection, and DC power rail surge suppression.
For engineers reviewing the SA75A-E3/73 datasheet, SA75A-E3/73 pinout, SA75A-E3/73 application, or SA75A-E3/73 equivalent, this page delivers verified electrical parameters, DO-15 terminal polarity mapping, bidirectional vs. unidirectional selection guidance, AEC-Q101 qualification status, and real-world clamping performance under standardized surge conditions.
Technical Context
The SA75A-E3/73 operates as a silicon avalanche diode optimized for fast transient suppression: it responds in <1 ps to overvoltage events and maintains low incremental surge resistance (<1 Ω typical) during 10/1000 µs surges. Its glass-passivated junction ensures stable VBR tolerance (±5 %) and long-term reliability under repetitive stress.
Designed for unidirectional operation only, it exhibits 3.5 V maximum forward voltage at 100 A surge and supports continuous power dissipation of 3.0 W on an infinite heatsink at TL = 75 °C. Junction temperature range spans –55 °C to +175 °C, enabling deployment in under-hood automotive and high-ambient industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 75 V - maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC working margin |
| VBR (min/max) | 83.3 V / 92.1 V at 1.0 mA - precise avalanche onset range ensuring predictable turn-on across production lots |
| VC @ IPPM | 121 V at 4.1 A - clamped voltage during full-rated 500 W transient, limiting downstream IC stress |
| PPPM | 500 W - peak pulse power handling per 10/1000 µs waveform, validated for automotive load-dump and ISO 7637-2 pulses |
| IFSM | 70 A - non-repetitive forward surge current capability (10 ms half-sine), supporting inrush and fault-current robustness |
| TJ max. | +175 °C - extended junction temperature rating enabling placement near heat sources without derating |
| AEC-Q101 | Qualified - certified for automotive electronic modules per stress test requirements including HTOL, TC, and HTRB |
Pinout & Package
Package: DO-15 (DO-204AC), axial-leaded, epoxy-molded case with matte tin-plated leads compliant to J-STD-002 and JESD 22-B102. Polarity marked by cathode band at one end; cathode connects to printed-circuit trace requiring negative bias during normal operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Forward current entry / transient return path | Connects to protected line's lower-potential side (e.g., GND or low-side rail); carries surge current back to source |
| Cathode (banded end) | Avalanche clamping node / high-impedance reference | Connected to line under protection (e.g., 75 V supply rail); initiates conduction when voltage exceeds VWM |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures ±5 % VBR tolerance and stable leakage (<1 μA at VWM) over 10-year field life |
| 500 W peak pulse power (10/1000 µs) | Withstands ISO 7637-2 Pulse 5a (load dump) up to 120 V without degradation |
| AEC-Q101 qualification | Validated for automotive powertrain and body control modules per stress-test protocols |
| Low clamping ratio (VC/VBR ≈ 1.31) | Minimizes overvoltage overshoot during fast transients, protecting 80 V-rated MOSFETs and gate drivers |
| Solderability (275 °C, 10 s) | Compatible with standard wave and reflow processes without delamination or parameter shift |
Applications
| Automotive Power Supply Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 75 V battery-fed ECUs against load-dump transients up to 120 V in 12 V/24 V hybrid systems. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and system ground to clamp positive-going surges. Use Value: Limits peak voltage to 121 V during 500 W transients, preventing damage to 80 V-rated DC-DC controllers and CAN transceivers. | Use Scenario: Shielding analog sensor inputs (e.g., pressure, temperature) from ESD and inductive switching noise in PLC I/O modules. IC Role / Device Role / Timing Role: Front-end transient suppressor on 24 V sensor supply line, upstream of LDO regulators and ADC front-ends. Use Value: Clamps 8 kV contact ESD (IEC 61000-4-2) within 1 ns while maintaining <1 μA leakage at 24 V, preserving signal integrity. |
| Telecom DC Power Feeds | Motor Drive Control Logic Protection |
Use Scenario: Safeguarding PoE-powered equipment receiving 57 V DC from IEEE 802.3bt PSEs against lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Primary surge clamp on input rectifier output, coordinated with MOV and gas discharge tube in multi-stage protection network. Use Value: Delivers 121 V clamping at 4.1 A with <1 Ω dynamic impedance, reducing let-through energy to downstream DC-DC converters by >60 %. | Use Scenario: Protecting isolated gate drivers and microcontroller GPIOs from flyback spikes generated by 48 V BLDC motor commutation. IC Role / Device Role / Timing Role: Localized TVS on gate drive supply rails (e.g., VBAT to VDD) to absorb 100 ns–1 µs inductive kickback. Use Value: Responds in <1 ps and clamps to 121 V, preventing latch-up in 5 V logic interfaces tied to 48 V motor phases via level shifters. |
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-E3/5BT | Same VWM (75 V), but SMA package (surface-mount); 400 W PPPM, higher VC (125 V) | Preferred for space-constrained PCBs where through-hole DO-15 is impractical | Select SMAJ75A-E3/5BT when board area is limited and thermal coupling to copper pour can compensate for lower PPPM |
| 1.5KE75A | Same DO-15 package and VWM, but higher PPPM (1500 W); larger case volume and 1.5× IFSM (100 A) | Suitable for high-energy surge zones (e.g., main battery input) where 500 W is insufficient | Choose 1.5KE75A only if system-level testing confirms need for >500 W clamping capacity and mechanical fit allows larger body |
Compared with SMAJ75A-E3/5BT and 1.5KE75A, the SA75A-E3/73 offers optimal balance of AEC-Q101 qualification, DO-15 manufacturability, and 500 W capability for mid-tier automotive and industrial protection - avoiding surface-mount assembly complexity while exceeding basic 1.5KE series reliability in thermally demanding environments.
Availability
SA75A-E3/73 is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface development, and telecom DC power feed protection requiring stable component supply across multi-year production cycles.
Supply support for SA75A-E3/73 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 leader in discrete semiconductors, specializing in diodes, rectifiers, and protection devices with emphasis on reliability, automotive qualification, and high-volume manufacturability.
The SAxxA series is engineered specifically for unidirectional transient suppression in harsh-environment applications - prioritizing tight VBR tolerance, AEC-Q101 compliance, and consistent clamping performance across temperature and lifetime.
FAQ
What is the maximum clamping voltage of the SA75A-E3/73 under rated surge conditions?
The SA75A-E3/73 exhibits a maximum clamping voltage (VC) of 121 V when subjected to its rated 4.1 A peak pulse current (IPPM) using the standard 10/1000 µs waveform. This value is measured per Figure 7 in Vishay document 88378 and reflects worst-case device behavior at TA = 25 °C. The SA75A-E3/73 maintains this clamping performance across its full operating temperature range due to low temperature coefficient (91 mV/°C).
Is the SA75A-E3/73 qualified for automotive use?
Yes, the SA75A-E3/73 is AEC-Q101 qualified, as confirmed in the "Notes" section of Vishay document 88378 (Revision: 27-Sep-2021). This qualification covers stress tests including high-temperature operating life (HTOL), temperature cycling (TC), and high-temperature reverse bias (HTRB), making the SA75A-E3/73 suitable for engine control units, body electronics, and ADAS modules. The "E3" suffix denotes RoHS-compliant commercial grade, while "HE3" indicates AEC-Q101 grade - both share identical electrical specs.
How does the SA75A-E3/73 differ from bidirectional variants like SA75CA?
The SA75A-E3/73 is unidirectional and features a cathode band for polarity identification, whereas SA75CA is bidirectional with no marking and symmetrical clamping in both directions. Electrically, SA75A-E3/73 has forward conduction capability (VF ≤ 3.5 V at 100 A), while SA75CA blocks in both directions until breakdown. The SA75A-E3/73 is selected for DC rail protection where polarity is fixed; SA75CA suits AC lines or differential signal pairs. Both share identical VWM, VBR, and PPPM.
What is the lead finish and soldering compatibility of the SA75A-E3/73?
The SA75A-E3/73 features matte tin-plated leads compliant with J-STD-002 and JESD 22-B102 solderability standards. It withstands solder dip at 275 °C for up to 10 seconds per JESD 22-B106, supporting wave soldering, selective soldering, and hand-soldering processes. The "E3" suffix also confirms compliance with JESD 201 Class 1A whisker testing, ensuring long-term interconnect reliability in vibration-prone applications such as automotive and industrial equipment.
Can the SA75A-E3/73 be used in parallel for higher surge current handling?
No - the SA75A-E3/73 is not recommended for parallel connection due to inherent VBR mismatch (±5 % tolerance), which causes uneven current sharing and potential thermal runaway. Vishay specifies single-device operation only; for higher surge ratings, select higher-power alternatives like 1.5KE75A or implement staged protection (e.g., TVS + MOV). Derating curves in Figure 2 of document 88378 confirm thermal limits assume single-device mounting with defined lead length (0.375") and ambient conditions.
SA75A-E3/73 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-204AC, DO-15, Axial
- Series:
- TransZorb®
- Packaging:
- Tape & Box (TB)
- 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):
- 4.1A
- 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-E3/73 FAQ
1.How can I place an order for SA75A-E3/73 through Aetrix?
Please submit a Request for Quotation (RFQ) for SA75A-E3/73 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-E3/73 reliable?
The price and inventory of SA75A-E3/73 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA75A-E3/73 is usually 5 days.
3.What payment methods are accepted for SA75A-E3/73?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA75A-E3/73 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA75A-E3/73?
SA75A-E3/73 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA75A-E3/73 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-E3/73?
For technical support, including SA75A-E3/73 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA75A-E3/73 requirements.
6.How does Aetrix verify that SA75A-E3/73 is sourced from the original manufacturer or authorized distributors?
All SA75A-E3/73 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-E3/73 meets industry standards.
7.What is the process for return or replacement of SA75A-E3/73?
All SA75A-E3/73 units undergo pre-shipment inspection (PSI). If there is an issue with SA75A-E3/73, 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-E3/73 part is unused and in its original packaging.
Return procedure for SA75A-E3/73:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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