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Vishay General Semiconductor - Diodes Division SA70HE3/73
- Part No.:
- SA70HE3/73
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA70HE3/73.pdf
- Description:
- TVS DIODE 70VWM 125VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,407
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Product details
Overview
SA70HE3/73 from Vishay General Semiconductor is a uni-directional Transient Voltage Suppressor (TVS) diode in DO-204AC (DO-15) package, rated for 70 V stand-off voltage (VWM), 77.8–86.0 V breakdown voltage (VBR), 500 W peak pulse power (10/1000 μs), 4.4 A peak pulse current (IPPM), and 113 V clamping voltage (VC) at IPPM. It protects MOSFETs and ICs against inductive switching transients in automotive power supplies.
For engineers reviewing the SA70HE3/73 datasheet, SA70HE3/73 pinout, SA70HE3/73 application, or SA70HE3/73 equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, DO-15 mechanical data, clamping behavior under surge, and direct alternatives for circuit protection design.
Technical Context
The SA70HE3/73 operates as a uni-directional avalanche diode with glass-passivated junction, optimized for fast response (<1 ns) to transient overvoltages. Its 70 V stand-off voltage allows stable blocking during normal 48 V or 60 V rail operation while triggering at ≥77.8 V to clamp damaging surges.
It delivers 500 W peak pulse power per 10/1000 μs waveform at TA = 25 °C, with derating above 25 °C per Fig. 2, and supports 70 A non-repetitive forward surge current (IFSM) - critical for load-dump immunity in automotive ECUs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 70 V - maximum continuous reverse voltage before clamping begins; sets operating margin for 48 V/60 V systems |
| VBR (min/max) | 77.8 V / 86.0 V at IT = 1.0 mA - defines reliable avalanche initiation range under production tolerance |
| VC @ IPPM | 113 V - clamped voltage during 4.4 A 10/1000 μs surge; determines protected device's voltage stress limit |
| PPPM | 500 W - peak transient energy absorption capability; validates compliance with ISO 7637-2 Pulse 5a |
| IFSM | 70 A - withstands single 10 ms half-sine surge; essential for automotive load-dump survival |
| TJ max | 175 °C - enables under-hood deployment without thermal derating penalties |
| Leakage ID | 1.0 μA at 70 V - ensures negligible standby current drain in battery-sensitive applications |
Pinout & Package
Package: DO-204AC (DO-15), axial-leaded, molded epoxy case meeting UL 94 V-0; matte tin-plated leads, RoHS-compliant, AEC-Q101 qualified (HE3 suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / surge return path | Connected to ground or low-side reference; must handle 70 A IFSM without bond wire failure |
| Cathode | Reverse-biased blocking terminal / clamping output | Marked with color band; connects to protected line (e.g., 48 V rail); sustains 113 V VC during transients |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated chip junction | Enables stable VBR over temperature and lifetime; eliminates moisture-induced parameter drift in humid environments |
| AEC-Q101 qualification | Validates reliability for automotive powertrain and body electronics per stress test requirements (HTOL, TC, UHAST) |
| 500 W peak pulse power (10/1000 μs) | Meets ISO 7637-2 Pulse 5a severity level for 12 V/48 V vehicle systems without external heatsinking |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (e.g., relay bounce), improving clamping precision |
| Solderable per J-STD-002/JESD 22-B102 | Supports automated reflow and wave soldering at 275 °C for ≤10 s without parametric shift or delamination |
Applications
| Automotive Load-Dump Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: 48 V battery system subjected to alternator load-dump events (ISO 7637-2 Pulse 5a). IC Role / Device Role / Timing Role: Uni-directional TVS placed between 48 V rail and chassis ground to clamp transients up to 120 V. Use Value: SA70HE3/73 clamps at 113 V with 500 W rating, protecting downstream DC-DC converters and microcontrollers without derating. | Use Scenario: Analog input channel on programmable logic controller exposed to field wiring inductive kickback. IC Role / Device Role / Timing Role: Front-end transient suppressor on 24 V sensor supply line, placed before signal conditioning op-amps. Use Value: 70 V VWM provides headroom above nominal 24 V, while 113 V VC limits stress on 100 V-rated op-amp inputs. |
| Telecom Power Supply Surge Clamping | Motor Drive Gate Driver Protection |
Use Scenario: -48 V telecom rectifier output subject to lightning-induced surges on distribution lines. IC Role / Device Role / Timing Role: Reverse-polarity TVS on negative rail to absorb common-mode transients entering via feed-through capacitors. Use Value: AEC-Q101 qualification ensures long-term stability in unattended central office environments; 175 °C TJ max supports high-ambient deployments. | Use Scenario: High-side gate driver supply (VBS) in 3-phase inverter subjected to Miller-induced voltage spikes. IC Role / Device Role / Timing Role: Clamp diode across bootstrap capacitor to prevent overvoltage damage to gate driver IC. Use Value: 4.4 A IPPM and 113 V VC limit VBS excursion to safe levels during 100 ns spike events, preserving MOSFET gate oxide integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ70A-E3/5A | Same DO-214AC (SMA) package; 70 V VWM, 77.8–86.0 V VBR, but lower 400 W PPPM and 32.5 A IPPM | Surface-mount only; unsuitable for through-hole legacy boards or high-current leaded layouts | Select when board space is constrained and 400 W surge capacity suffices |
| 1.5KE70A | DO-201AD package; identical 70 V VWM and 500 W PPPM, but higher 120 V VC and 1.5 g weight | Larger footprint and thermal mass; better for high-energy, low-frequency surges (e.g., AC mains coupling) | Select when higher clamping margin is acceptable and leaded robustness is prioritized over size |
Compared with SMAJ70A-E3/5A and 1.5KE70A, the SA70HE3/73 offers AEC-Q101 qualification and DO-15 form factor ideal for automotive through-hole designs requiring proven under-hood reliability and exact legacy footprint compatibility.
Availability
SA70HE3/73 is available at Aetrix Electronics and suitable for automotive ECU protection, industrial PLC I/O hardening, and telecom -48 V power rail surge suppression requiring stable component supply and long-lifecycle support.
Supply support for SA70HE3/73 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, AEC-Q101 validation, and automotive-grade manufacturing.
The SAxxHE3 series belongs to Vishay's TRANSZORB® TVS family, engineered specifically for robust transient suppression in harsh environments including automotive power systems, industrial controls, and telecom infrastructure.
FAQ
What is the clamping voltage of the SA70HE3/73 at its rated peak pulse current?
The SA70HE3/73 has a maximum clamping voltage (VC) of 113 V at its rated peak pulse current (IPPM) of 4.4 A under a 10/1000 μs waveform. This value is measured per Figure 7 in the official Vishay datasheet (Doc. #88378) and defines the upper voltage limit imposed on protected circuits during standardized surge events. The SA70HE3/73 maintains this clamping performance across its specified operating temperature range.
Is the SA70HE3/73 suitable for automotive applications?
Yes, the SA70HE3/73 is AEC-Q101 qualified, confirming its suitability for automotive applications including engine control units, body electronics, and ADAS power supplies. Its 175 °C maximum junction temperature, glass-passivated junction, and validated performance under temperature cycling and humidity testing meet automotive reliability requirements. The HE3 suffix explicitly denotes AEC-Q101 qualification per Vishay's ordering nomenclature.
What does the "HE3" suffix indicate in SA70HE3/73?
The "HE3" suffix in SA70HE3/73 indicates RoHS-compliant construction with AEC-Q101 qualification and JESD 201 Class 2 whisker resistance. Per Vishay's documentation, HE3 parts undergo enhanced process controls for automotive use, including stricter lot traceability, extended reliability testing, and matte tin plating validated for solderability per J-STD-002. This distinguishes SA70HE3/73 from commercial-grade E3 variants.
How does the SA70HE3/73 differ from bi-directional TVS diodes like SA70CA?
The SA70HE3/73 is a uni-directional TVS diode, meaning it blocks voltage in one direction (anode-to-cathode) and clamps only in reverse bias - ideal for DC rails with defined polarity. In contrast, SA70CA is bi-directional and clamps symmetrically in both directions, suited for AC lines or differential signals. The SA70HE3/73 exhibits forward conduction behavior (VF = 3.5 V at 100 A), while SA70CA does not conduct forward and has no VF specification.
What is the maximum steady-state power dissipation for the SA70HE3/73?
The SA70HE3/73 has a maximum steady-state power dissipation (PD) of 3.0 W when mounted on an infinite heatsink at lead temperature (TL) of 75 °C, per Figure 5 in the Vishay datasheet. This rating applies to continuous DC or low-duty-cycle conditions and is distinct from its 500 W peak pulse capability. Derating is required above TL = 75 °C, with zero power allowed at TL = 175 °C.
SA70HE3/73 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AC (DO-15)
SA70HE3/73 FAQ
1.How can I place an order for SA70HE3/73 through Aetrix?
Please submit a Request for Quotation (RFQ) for SA70HE3/73 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 SA70HE3/73 reliable?
The price and inventory of SA70HE3/73 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA70HE3/73 is usually 5 days.
3.What payment methods are accepted for SA70HE3/73?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA70HE3/73 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA70HE3/73?
SA70HE3/73 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA70HE3/73 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 SA70HE3/73?
For technical support, including SA70HE3/73 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA70HE3/73 requirements.
6.How does Aetrix verify that SA70HE3/73 is sourced from the original manufacturer or authorized distributors?
All SA70HE3/73 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 SA70HE3/73 meets industry standards.
7.What is the process for return or replacement of SA70HE3/73?
All SA70HE3/73 units undergo pre-shipment inspection (PSI). If there is an issue with SA70HE3/73, 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 SA70HE3/73 part is unused and in its original packaging.
Return procedure for SA70HE3/73:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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