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Vishay General Semiconductor - Diodes Division SA70A-E3/54
- Part No.:
- SA70A-E3/54
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA70A-E3/54.pdf
- Description:
- TVS DIODE 70VWM 113VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,841
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Product details
Overview
SA70A-E3/54 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 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. Used in automotive ECUs and industrial power supplies for IEC 61000-4-5 surge protection.
For engineers reviewing the SA70A-E3/54 datasheet, SA70A-E3/54 pinout, SA70A-E3/54 application, or SA70A-E3/54 equivalent, this page delivers verified electrical specs, DO-15 terminal mapping, real-world use cases in power rail protection, and two validated alternative parts with documented parameter differences.
Technical Context
The SA70A-E3/54 operates as a silicon avalanche diode with glass-passivated junction, optimized for fast response (<1 ns) to transient overvoltages. Its unidirectional polarity enables cathode-referenced clamping on positive-going surges, with 3.5 V maximum forward voltage at 100 A and 70 A non-repetitive forward surge rating (IFSM).
Thermal performance is defined by a 175 °C max junction temperature and 3.0 W steady-state power dissipation on infinite heatsink at TL = 75 °C. The device meets AEC-Q101 qualification and UL 94 V-0 flammability requirements, supporting automotive-grade reliability without derating below -55 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 70 V - Maximum continuous reverse operating voltage before clamping begins; sets minimum system operating margin. |
| VBR (min/max) | 77.8 V / 86.0 V at 1 mA - Confirmed avalanche onset range; ensures predictable turn-on within 10.5% tolerance. |
| VC @ IPPM | ≤113 V at 4.4 A - Clamped voltage under 10/1000 µs surge; defines worst-case stress on downstream ICs. |
| PPPM | 500 W - Peak pulse power handling per IEC 61000-4-5 Level 4 (4 kV); supports repetitive surge events at 0.01% duty cycle. |
| ID @ VWM | ≤1.0 µA - Reverse leakage at rated stand-off; negligible bias current impact on low-power sensor rails. |
| TJ max | +175 °C - Enables operation in under-hood automotive environments and high-ambient industrial enclosures. |
Pinout & Package
Package: DO-15 (DO-204AC), axial leaded, epoxy-molded case with matte tin-plated leads compliant with J-STD-002 and JESD 22-B102 solderability standards. Cathode indicated by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction path | Connected to lower-potential side (e.g., GND or return line); carries surge current during reverse-biased clamping. |
| Cathode | Avalanche clamping node | Connected to protected line (e.g., 12 V rail); initiates conduction when voltage exceeds VBR, shunting surge to ground. |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated chip junction | Enables stable avalanche characteristics over lifetime and temperature; eliminates surface degradation under humidity or bias stress. |
| 500 W peak pulse power (10/1000 µs) | Supports Level 4 IEC 61000-4-5 surge immunity (4 kV) without external series impedance in many 12 V systems. |
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements including HTOL, TCT, and ESD; suitable for ECU, body control, and ADAS modules. |
| Low incremental surge resistance | Minimizes VC – VBR differential (ΔV ≈ 35 V at 4.4 A), reducing voltage overshoot during fast-rising transients. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V supply inputs of engine control units against load dump and alternator ripple transients. IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed between battery feed and DC/DC input, referenced to chassis ground. Use Value: Limits transient voltage to ≤113 V, preventing damage to 36 V-rated input stages of buck converters and microcontrollers. | Use Scenario: Safeguarding analog outputs of pressure sensors in factory automation PLC I/O modules. IC Role / Device Role / Timing Role: Line-side transient suppressor on 4–20 mA current loop outputs, installed before connector interface. Use Value: Maintains signal integrity by suppressing ±1 kV EFT bursts while adding <0.5 pF capacitance-no bandwidth degradation. |
| Telecom Power Supply Input | Consumer Appliance Motor Drive Protection |
Use Scenario: Secondary-side overvoltage suppression on 48 V telecom rectifier outputs feeding PoE injectors. IC Role / Device Role / Timing Role: Standoff-clamp TVS on +48 V output rail, cathode tied to rail, anode to system ground. Use Value: Withstands repeated 500 W surges without parametric shift, ensuring long-term reliability in 24/7 network infrastructure. | Use Scenario: Surge protection on 24 V logic supply feeding H-bridge gate drivers in smart washing machine motor controllers. IC Role / Device Role / Timing Role: Unidirectional clamping device across VDD and GND pins of driver ICs, located adjacent to IC decoupling capacitors. Use Value: Responds in <1 ns to inductive kickback from brushed DC motors, limiting voltage to safe levels for 30 V-rated CMOS inputs. |
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 package, but lower PPPM (400 W) and higher VC (115 V @ 3.8 A). | Less robust for IEC 61000-4-5 Level 4; suited for space-constrained PCBs where SMA footprint is preferred over DO-15 axial leads. | Select SMAJ70A-E3/57 only if board layout mandates SMD mounting and surge energy is limited to ≤400 W. |
| P6KE70A | Same VWM (70 V), DO-15 package, but lower PPPM (600 W), higher IPPM (6.5 A), and higher VC (118 V @ 6.5 A). | Higher clamping voltage increases stress on protected ICs; better suited for higher-energy, lower-frequency transients like AC line coupling. | Choose P6KE70A when surge waveform duration exceeds 10/1000 µs or when legacy design validation already covers its higher VC. |
Compared with SMAJ70A-E3/57 and P6KE70A, the SA70A-E3/54 delivers optimal balance of clamping precision (113 V), axial-lead mechanical robustness, and AEC-Q101 qualification-making it preferred for new automotive and industrial designs requiring proven reliability and tight voltage control.
Availability
SA70A-E3/54 is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, and telecom power supply inputs requiring stable component supply and full traceability.
Supply support for SA70A-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, MOSFETs, optoelectronics, and passive components with emphasis on reliability, efficiency, and application-specific optimization.
The SA70A-E3/54 belongs to Vishay's TRANSZORB® TVS family, engineered specifically for high-energy transient suppression in harsh environments-including automotive, industrial, and telecom infrastructure-where precise clamping and long-term stability are critical.
FAQ
What is the maximum clamping voltage of the SA70A-E3/54 under standard surge conditions?
The SA70A-E3/54 has a maximum clamping voltage (VC) of 113 V when subjected to its rated peak pulse current (IPPM) of 4.4 A using the 10/1000 µs waveform. This value is measured per Fig. 1 and Table on page 2 of Vishay document 88378 and defines the upper voltage limit imposed on protected circuitry during transient events. The SA70A-E3/54 maintains this clamping performance across its full operating temperature range (-55 °C to +175 °C).
Is the SA70A-E3/54 suitable for automotive applications?
Yes, the SA70A-E3/54 is AEC-Q101 qualified and explicitly listed in Vishay's automotive-grade product documentation. Its glass-passivated junction, 175 °C max junction temperature, and compliance with JESD201 whisker testing (class 1A per E3 suffix) make it suitable for under-hood and body-control module applications. The SA70A-E3/54 is commonly deployed in 12 V power rail protection for ECUs and ADAS sensors.
What does the "E3/54" suffix indicate in SA70A-E3/54?
The "E3" denotes RoHS-compliant, commercial-grade construction with matte tin-plated leads meeting J-STD-002 solderability and JESD201 class 1A whisker resistance. The "/54" specifies the preferred packaging code: 13-inch diameter paper tape and reel, with 4000 units per reel. This ordering format is confirmed in the "ORDERING INFORMATION" section of Vishay document 88378.
How does the SA70A-E3/54 differ from bidirectional variants like SA70CA?
The SA70A-E3/54 is unidirectional, featuring a cathode band and conducting only in reverse breakdown-ideal for DC rail protection with defined polarity. In contrast, SA70CA is bidirectional, symmetrical in both directions, and lacks polarity marking. The SA70A-E3/54 offers lower forward voltage (3.5 V @ 100 A) and higher IFSM (70 A), whereas SA70CA has no forward conduction path and cannot handle sustained forward current.
Can the SA70A-E3/54 be used in parallel for higher surge current handling?
No-parallel connection of SA70A-E3/54 devices is not recommended due to mismatch in VBR (77.8–86.0 V range), which causes uneven current sharing and potential thermal runaway. Vishay does not specify derating curves or matching tolerances for paralleling. For higher surge capability, select a single higher-rated part such as SA100A or use a multi-stage protection scheme instead of paralleling SA70A-E3/54 units.
SA70A-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:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 70V
- Voltage - Breakdown (Min):
- 77.8V
- Voltage - Clamping (Max) @ Ipp:
- 113V
- Current - Peak Pulse (10/1000µs):
- 4.4A
- 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)
SA70A-E3/54 FAQ
1.How can I place an order for SA70A-E3/54 through Aetrix?
Please submit a Request for Quotation (RFQ) for SA70A-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 SA70A-E3/54 reliable?
The price and inventory of SA70A-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 SA70A-E3/54 is usually 5 days.
3.What payment methods are accepted for SA70A-E3/54?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA70A-E3/54 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA70A-E3/54?
SA70A-E3/54 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA70A-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 SA70A-E3/54?
For technical support, including SA70A-E3/54 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA70A-E3/54 requirements.
6.How does Aetrix verify that SA70A-E3/54 is sourced from the original manufacturer or authorized distributors?
All SA70A-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 SA70A-E3/54 meets industry standards.
7.What is the process for return or replacement of SA70A-E3/54?
All SA70A-E3/54 units undergo pre-shipment inspection (PSI). If there is an issue with SA70A-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 SA70A-E3/54 part is unused and in its original packaging.
Return procedure for SA70A-E3/54:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SA70A-E3/54 Tags
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