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Vishay General Semiconductor - Diodes Division SA70-E3/54
- Part No.:
- SA70-E3/54
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA70-E3/54.pdf
- Description:
- TVS DIODE 70VWM 125VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,085
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Product details
Overview
SA70-E3/54 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, 500 W peak pulse power (10/1000 μs), 4.4 A peak pulse current (IPPM), and clamps to ≤113 V at rated surge. It is widely used in industrial power supplies and automotive ECUs to protect MOSFETs and microcontrollers from inductive switching transients.
For engineers reviewing the SA70-E3/54 datasheet, SA70-E3/54 pinout, SA70-E3/54 application, or SA70-E3/54 equivalent, this page delivers verified electrical parameters, polarity marking guidance, thermal derating behavior, AEC-Q101 qualification status, and real-world clamping performance under standardized surge waveforms - all critical for robust ESD and lightning surge protection design.
Technical Context
The SA70-E3/54 operates as a silicon avalanche diode with glass-passivated junction, enabling fast response (<1 ns) to transient overvoltages and low incremental clamping resistance. Its unidirectional configuration provides forward conduction path during positive surges while blocking reverse leakage up to 1.0 μA at 70 V.
It is rated for 70 A non-repetitive forward surge current (IFSM, 10 ms half-sine), supports continuous power dissipation of 3.0 W on infinite heatsink at TL = 75 °C, and maintains stable operation across –55 °C to +175 °C junction temperature range - making it suitable for under-hood automotive and high-temperature industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 70 V - Maximum continuous reverse operating voltage before significant leakage; defines safe DC rail margin. |
| VBR (min/max) | 77.8 V / 86.0 V at 1 mA - Confirmed avalanche onset range; ensures predictable turn-on during transients. |
| VC @ IPPM | ≤113 V at 4.4 A (10/1000 μs) - Clamping voltage under full-rated surge; determines protected circuit's maximum stress level. |
| PPPM | 500 W - Peak surge energy handling capacity per IEC 61000-4-5 Level 4 compliance testing. |
| IFSM | 70 A - Single-cycle surge current rating; validates survivability against motor-switching or relay-bounce events. |
| TJ max | +175 °C - Enables placement near heat sources (e.g., power MOSFETs, transformers) without thermal derating penalties. |
| Polarity | Unidirectional - Cathode marked by band; blocks reverse current until breakdown, conducts forward during positive surges. |
Pinout & Package
Package: DO-204AC (DO-15), axial-leaded, molded epoxy case meeting UL 94 V-0. Matte tin-plated leads, RoHS-compliant, JESD 22-B102 solderable. Cathode indicated by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unbanded end) | Forward current entry / Surge return path | Connected to protected line's low-side or ground reference; completes clamping loop during positive transients. |
| Cathode (banded end) | Avalanche conduction node / High-side connection | Connected to protected line's high-side (e.g., +12 V rail); initiates clamping when voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures long-term reliability and stable VBR drift <±5 % over 1000 hrs at TJ = 125 °C. |
| 500 W peak pulse power (10/1000 μs) | Validated for IEC 61000-4-5 surge immunity up to 4 kV (line-earth) in typical PCB layouts. |
| AEC-Q101 qualified | Qualified for automotive powertrain and body electronics per stress test requirements including HTGB, HTRB, and TCT. |
| Low clamping ratio (VC/VBR ≈ 1.36) | Minimizes voltage overshoot during clamping - critical for protecting 75 V-rated MOSFETs and logic ICs. |
| Solder dip tolerance: 275 °C, 10 s | Supports wave and selective soldering without parametric shift or delamination risk. |
Applications
| Automotive Power Distribution | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting 12 V/24 V battery-fed control modules from load-dump and alternator ripple transients. IC Role / Device Role / Timing Role: Primary TVS clamp on main power input rail upstream of DC-DC converters and microcontrollers. Use Value: Limits transient voltage to ≤113 V, preventing latch-up or gate oxide damage in downstream 3.3 V/5 V logic and 80 V MOSFETs. | Use Scenario: Shielding analog input channels (e.g., 4–20 mA sensors) from EFT bursts and field-wiring induced surges. IC Role / Device Role / Timing Role: First-stage protection device placed at connector entry point before signal conditioning op-amps. Use Value: Sub-1 ns response time suppresses >90 % of 5 kHz–100 MHz noise energy before it reaches precision ADC front-ends. |
| Telecom Power Feeds | Consumer Appliance Motor Drivers |
Use Scenario: Safeguarding PoE-powered Ethernet switches and base station RF modules from lightning-induced common-mode surges. IC Role / Device Role / Timing Role: Secondary-level TVS on isolated DC output rails feeding sensitive RF ICs and PHY controllers. Use Value: Withstands repetitive 500 W surges at 0.01 % duty cycle, ensuring multi-year field reliability in outdoor telecom cabinets. | Use Scenario: Suppressing back-EMF spikes generated by brushed DC motors in washing machines and HVAC blowers. IC Role / Device Role / Timing Role: Snubber-connected across motor terminals or flyback diode replacement in H-bridge driver stages. Use Value: Handles 70 A single-pulse IFSM, eliminating need for external series resistors or RC snubbers in cost-sensitive white-goods designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ70A-E3/52 (Vishay) | Same VWM/VBR/PPPM specs but SMA package (surface-mount); lower IFSM (30 A vs. 70 A). | Preferred for space-constrained PCBs where through-hole mounting is impractical. | Select SMAJ70A-E3/52 only if board layout prohibits axial-leaded components and surge currents remain <30 A. |
| 1.5KE70A (ON Semiconductor) | Identical DO-204AC package and VWM/VBR/PPPM ratings; slightly higher VC (115 V vs. 113 V) and same IFSM (70 A). | Drop-in replacement in legacy designs already using 1.5KE series; identical footprint and thermal profile. | Choose 1.5KE70A when sourcing continuity is required and minor clamping voltage increase is acceptable. |
Compared with SMAJ70A-E3/52 and 1.5KE70A, the SA70-E3/54 offers superior surge current handling (70 A IFSM) in through-hole form factor, making it optimal for high-energy industrial and automotive power-line protection where mechanical robustness and thermal mass matter.
Availability
SA70-E3/54 is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLCs, and telecom power supplies requiring stable component supply with AEC-Q101 qualification and long-lifecycle support.
Supply support for SA70-E3/54 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, MOSFETs, and protection devices with emphasis on reliability, AEC-Q qualification, and high-volume manufacturability.
The SAxxA series is part of Vishay's TRANSZORB® TVS family, engineered specifically for robust, low-clamping overvoltage protection in harsh environments - including automotive, industrial automation, and infrastructure equipment.
FAQ
What is the maximum clamping voltage of SA70-E3/54 under standard 10/1000 μs surge conditions?
The SA70-E3/54 clamps to a maximum of 113 V when subjected to its rated peak pulse current of 4.4 A (10/1000 μs waveform). This value is measured per IEC 61000-4-5 and guarantees that downstream components see no more than 113 V during worst-case surge events - critical for safeguarding 75 V-rated power FETs and interface ICs. The SA70-E3/54 achieves this with a clamping ratio (VC/VBR) of approximately 1.36, reflecting high avalanche efficiency.
Is SA70-E3/54 suitable for automotive applications, and what qualification does it hold?
Yes, SA70-E3/54 is AEC-Q101 qualified, confirming its suitability for automotive powertrain and body electronics. It passes stress tests including high-temperature reverse bias (HTRB), high-temperature gate bias (HTGB), and temperature cycling (TCT). The SA70-E3/54 is commonly deployed in engine control units, lighting modules, and ADAS sensor power rails where reliability under thermal and electrical stress is mandatory. Its 175 °C max junction temperature further supports under-hood deployment.
How does the unidirectional configuration of SA70-E3/54 affect its circuit placement and protection scope?
The unidirectional configuration of SA70-E3/54 means it protects only against positive-going transients on DC lines - conducting when voltage at the cathode exceeds VBR relative to anode. It must be installed with the banded (cathode) end toward the protected high-side rail and unbanded (anode) end toward ground or low-side return. This orientation blocks reverse leakage (<1.0 μA at 70 V) while enabling fast clamping of inductive kickback or load-dump spikes. The SA70-E3/54 is not intended for AC or bidirectional signal lines.
What is the thermal derating behavior of SA70-E3/54 above 25 °C ambient?
SA70-E3/54 follows Vishay's standard derating curve: its peak pulse power remains constant up to 25 °C, then linearly decreases to ~50 % at 125 °C ambient and reaches zero at 175 °C. For steady-state power, its 3.0 W rating applies only at TL = 75 °C on infinite heatsink; above that, power must be reduced per Fig. 5 in the datasheet. Designers should verify PCB copper area and airflow to ensure junction temperature stays within –55 °C to +175 °C limits during sustained surge repetition. The SA70-E3/54's glass passivation enhances thermal stability versus epoxy-only alternatives.
Can SA70-E3/54 replace older 1N5374B or P6KE70A devices in existing designs?
SA70-E3/54 is a direct functional and mechanical replacement for 1N5374B and P6KE70A - sharing DO-204AC package, 70 V VWM, 500 W PPPM, and comparable VBR/VC specs. Key improvements include AEC-Q101 qualification, tighter VBR tolerance (77.8–86.0 V vs. ±10 %), and enhanced surge lifetime under repetitive stress. No PCB changes are required, and solder process compatibility is maintained (275 °C/10 s max). For new designs, SA70-E3/54 offers better long-term reliability and automotive-grade validation compared to legacy parts.
SA70-E3/54 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-204AC, DO-15, Axial
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- 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-E3/54 FAQ
1.How can I place an order for SA70-E3/54 through Aetrix?
Please submit a Request for Quotation (RFQ) for SA70-E3/54 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-E3/54 reliable?
The price and inventory of SA70-E3/54 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA70-E3/54 is usually 5 days.
3.What payment methods are accepted for SA70-E3/54?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA70-E3/54 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA70-E3/54?
SA70-E3/54 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA70-E3/54 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-E3/54?
For technical support, including SA70-E3/54 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA70-E3/54 requirements.
6.How does Aetrix verify that SA70-E3/54 is sourced from the original manufacturer or authorized distributors?
All SA70-E3/54 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-E3/54 meets industry standards.
7.What is the process for return or replacement of SA70-E3/54?
All SA70-E3/54 units undergo pre-shipment inspection (PSI). If there is an issue with SA70-E3/54, 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-E3/54 part is unused and in its original packaging.
Return procedure for SA70-E3/54:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SA70-E3/54 Tags
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