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Vishay General Semiconductor - Diodes Division SA70-E3/73
- Part No.:
- SA70-E3/73
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA70-E3/73.pdf
- Description:
- TVS DIODE 70VWM 125VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,783
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Product details
Overview
SA70-E3/73 from Vishay General Semiconductor is a unidirectional Transient Voltage Suppressor (TVS) diode in DO-204AC (DO-15) package, designed for primary overvoltage protection of DC power rails and signal lines. It features a 70 V stand-off voltage (VWM), 77.8–86.0 V breakdown voltage (VBR) at 1 mA, 113 V maximum clamping voltage (VC) at 4.4 A peak pulse current, 500 W peak pulse power (10/1000 μs), and AEC-Q101 qualification for automotive-grade reliability.
For engineers reviewing the SA70-E3/73 datasheet, SA70-E3/73 pinout, SA70-E3/73 application, or SA70-E3/73 equivalent, this device serves as a robust, RoHS-compliant, lead-free transient suppressor for automotive power supply inputs, industrial sensor interfaces, and MOSFET gate protection where fast response (<1 ps), low clamping ratio, and high surge immunity are required.
Technical Context
The SA70-E3/73 operates as a unidirectional avalanche diode with glass-passivated junction, enabling sub-nanosecond response to transients and stable clamping under repetitive 10/1000 μs surges at 0.01% duty cycle. Its 3.0 W steady-state power dissipation and 175 °C max junction temperature support operation in thermally constrained environments.
It exhibits 5.0 μA maximum reverse leakage at 70 V, 3.5 V forward voltage at 100 A surge, and a positive temperature coefficient of breakdown voltage (~85 mV/°C), ensuring predictable thermal behavior during sustained overvoltage events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 70 V - Maximum continuous reverse operating voltage before significant conduction begins; defines safe DC rail margin. |
| VBR (Breakdown Voltage) | 77.8–86.0 V at 1 mA - Avalanche onset range; ensures reliable triggering above normal operating voltage with margin. |
| VC (Clamping Voltage) | 113 V at 4.4 A (10/1000 μs) - Peak voltage seen by protected circuit during worst-case surge; determines downstream component stress. |
| PPPM (Peak Pulse Power) | 500 W - Sustains standardized 10/1000 μs transient without failure; enables protection against ISO 7637-2 Pulse 1/2a/5a. |
| IFSM (Surge Current) | 70 A (8.3 ms half-sine) - Withstands non-repetitive inrush or load-dump events common in 12 V automotive systems. |
| TJmax | 175 °C - Supports under-hood deployment and long-term reliability in high-ambient industrial or automotive enclosures. |
| Package | DO-204AC (DO-15) - Industry-standard axial-leaded package with matte tin-plated leads, UL 94 V-0 molding, and JESD 201 Class 1A whisker resistance. |
Pinout & Package
DO-204AC (DO-15) package: axial-leaded, molded epoxy case with cathode band marking. Leads are matte tin-plated, solderable per J-STD-002 and JESD 22-B102; polarity indicated by single color band at cathode end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Forward current entry / low-side reference | Connected to ground or low-voltage return path; forms clamping loop with cathode to rail. |
| Cathode (banded end) | Reverse-biased clamping node | Connected to protected line (e.g., +12 V rail); conducts avalanche current during overvoltage to shunt energy to ground. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable, repeatable avalanche characteristics and long-term reliability under thermal cycling and humidity. |
| 500 W peak pulse power (10/1000 μs) | Provides robust protection against common automotive and industrial transients without derating at 25 °C ambient. |
| AEC-Q101 qualified (E3 suffix variant) | Validated for automotive applications including engine control units, body electronics, and ADAS sensor interfaces. |
| Low incremental surge resistance | Minimizes VC – VBR differential (clamping ratio ~1.45), reducing stress on downstream ICs and MOSFETs. |
| RoHS-compliant, lead-free, JESD 201 Class 1A | Meets global environmental regulations and mitigates tin whisker risk in high-reliability, long-lifecycle deployments. |
Applications
| Automotive Power Input Protection | Industrial Sensor Signal Line Clamping |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump (ISO 7637-2 Pulse 5a) and alternator switching transients. IC Role / Device Role / Timing Role: Primary unidirectional TVS placed between battery rail and input filter capacitor. Use Value: Limits transient voltage to ≤113 V, preventing damage to upstream DC-DC controllers and microcontrollers rated for 120 V absolute max. |
Use Scenario: Safeguarding analog outputs of pressure/temperature sensors connected to PLC I/O modules. IC Role / Device Role / Timing Role: Low-capacitance (≈100 pF) clamping element on 4–20 mA or 0–10 V output lines exposed to ESD and field wiring surges. Use Value: Responds in <1 ns to clamp induced spikes up to 500 W, preserving signal integrity and avoiding ADC saturation or op-amp latch-up. |
| MOSFET Gate Protection | DC Power Rail Surge Suppression |
Use Scenario: Shielding N-channel MOSFET gates in motor drive half-bridges from Miller-induced voltage spikes during switching. IC Role / Device Role / Timing Role: Unidirectional TVS tied between gate and source, with cathode to gate, anode to source. Use Value: Clamps gate-source voltage to ≤113 V, preventing oxide breakdown while adding negligible capacitance (<150 pF) that avoids switching delay. |
Use Scenario: Secondary overvoltage defense on regulated 5 V or 3.3 V supplies feeding FPGAs or communication ICs. IC Role / Device Role / Timing Role: Standby clamping device downstream of primary DC-DC converter, activated only during fault conditions. Use Value: Absorbs residual transients escaping upstream filtering, maintaining rail stability within ±5% during 4.4 A surges without thermal runaway. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ70A-E3/57 | Same VWM (70 V), identical DO-214AC (SMA) package; slightly higher VC (115 V @ 4.3 A), lower IPPM rating. | Surface-mount alternative for space-constrained PCBs; requires rework of footprint and thermal relief design. | Select SMAJ70A-E3/57 when board area is limited and reflow compatibility with SMA footprint is required. |
| 1.5KE70A | Higher PPPM (1500 W), larger DO-201AD package; same VWM/VBR range but slower response due to higher junction capacitance. | Better suited for high-energy lightning-induced surges in telecom power feeds; over-spec'd for automotive load dump. | Choose 1.5KE70A only when system-level testing confirms need for >500 W surge handling and board layout accommodates larger axial package. |
Compared with SMAJ70A-E3/57 and 1.5KE70A, the SA70-E3/73 offers optimal balance of automotive qualification, axial through-hole manufacturability, and precise 500 W/113 V clamping performance for cost-sensitive, high-volume 12 V system protection.
Availability
SA70-E3/73 is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interface modules, and DC power distribution boards requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SA70-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 application-specific performance.
The SAxxA series was developed specifically for robust, cost-effective transient suppression in automotive and industrial power systems, targeting ISO 7637-2 and IEC 61000-4-5 compliance with minimal design overhead.
FAQ
What is the maximum clamping voltage of the SA70-E3/73 under standard test conditions?
The SA70-E3/73 has a maximum clamping voltage (VC) of 113 V when subjected to a 10/1000 μs waveform with a peak pulse current (IPPM) of 4.4 A. This value is measured per JEDEC standards and defines the upper voltage limit imposed on protected circuits during transient events. The SA70-E3/73 maintains this clamping performance across its specified operating temperature range of –55 °C to +175 °C.
Is the SA70-E3/73 suitable for automotive applications?
Yes, the SA70-E3/73 is AEC-Q101 qualified and manufactured with RoHS-compliant, lead-free materials meeting JESD 201 Class 1A whisker requirements. Its 175 °C maximum junction temperature, robust surge ratings (70 A IFSM, 500 W PPPM), and glass-passivated junction make it suitable for under-hood and chassis-mounted automotive electronics, including body control modules and sensor interfaces.
What does the "E3" suffix indicate in SA70-E3/73?
The "E3" suffix in SA70-E3/73 denotes Vishay's commercial-grade, RoHS-compliant, lead-free construction with matte tin-plated leads and JESD 201 Class 1A whisker resistance. It distinguishes this variant from the "HE3" (AEC-Q101 qualified) version and confirms compliance with UL 94 V-0 flammability and JEDEC moisture sensitivity level 1 standards.
How does the SA70-E3/73 differ from bi-directional TVS diodes like SA70CA?
The SA70-E3/73 is unidirectional and features a cathode band for polarity identification, enabling use in DC circuits where reverse conduction must be blocked. In contrast, SA70CA is bi-directional with no polarity marking and symmetric clamping in both directions-suitable for AC lines or data buses. Their VBR and VC values differ: SA70CA has VBR = 77.8–86.0 V and VC = 126 V at 4.0 A, reflecting higher clamping under bidirectional stress.
What is the reverse leakage current specification for the SA70-E3/73 at rated stand-off voltage?
The SA70-E3/73 exhibits a maximum reverse leakage current (ID) of 1.0 μA at its rated stand-off voltage (VWM) of 70 V and ambient temperature of 25 °C. This low leakage ensures minimal power loss in standby mode and prevents unintended loading of sensitive voltage rails or precision reference circuits powered by the same supply.
SA70-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:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 70V
- Voltage - Breakdown (Min):
- 77.8V
- Voltage - Clamping (Max) @ Ipp:
- 125V
- Current - Peak Pulse (10/1000µs):
- 4A
- 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)
SA70-E3/73 FAQ
1.How can I place an order for SA70-E3/73 through Aetrix?
Please submit a Request for Quotation (RFQ) for SA70-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 SA70-E3/73 reliable?
The price and inventory of SA70-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 SA70-E3/73 is usually 5 days.
3.What payment methods are accepted for SA70-E3/73?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA70-E3/73 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA70-E3/73?
SA70-E3/73 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA70-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 SA70-E3/73?
For technical support, including SA70-E3/73 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA70-E3/73 requirements.
6.How does Aetrix verify that SA70-E3/73 is sourced from the original manufacturer or authorized distributors?
All SA70-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 SA70-E3/73 meets industry standards.
7.What is the process for return or replacement of SA70-E3/73?
All SA70-E3/73 units undergo pre-shipment inspection (PSI). If there is an issue with SA70-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 SA70-E3/73 part is unused and in its original packaging.
Return procedure for SA70-E3/73:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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