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Vishay General Semiconductor - Diodes Division SA70AHE3/54
- Part No.:
- SA70AHE3/54
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA70AHE3/54.pdf
- Description:
- TVS DIODE 70VWM 113VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,590
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Product details
Overview
SA70AHE3/54 from Vishay General Semiconductor is a unidirectional Transient Voltage Suppressor (TVS) diode in DO-15 package, designed for robust overvoltage protection of sensitive electronics. 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. It is AEC-Q101 qualified and used to protect MOSFETs, ICs, and sensor signal lines against inductive switching transients in automotive and industrial control systems.
For engineers reviewing the SA70AHE3/54 datasheet, SA70AHE3/54 pinout, SA70AHE3/54 application, or SA70AHE3/54 equivalent, this page delivers verified electrical parameters, DO-15 terminal polarity mapping, real-world clamping behavior under 10/1000 µs surges, AEC-Q101 qualification status, and direct alternatives with documented VWM/VBR/IPPM trade-offs.
Technical Context
The SA70AHE3/54 operates as a unidirectional avalanche diode, conducting only when reverse voltage exceeds its specified breakdown range (77.8–86.0 V). Its glass-passivated junction ensures stable VBR tolerance and low leakage (<1.0 µA at 70 V), while its low incremental surge resistance enables rapid clamping response (<1 ns typical) during transient events.
It is rated for 70 A non-repetitive forward surge (IFSM, 10 ms half-sine) and dissipates up to 3.0 W continuously on an infinite heatsink at TL = 75 °C. Junction temperature range spans −55 °C to +175 °C, supporting under-hood automotive and high-temperature industrial deployments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 70 V - Maximum continuous reverse operating voltage before conduction begins; defines safe working margin below breakdown. |
| VBR (min/max) | 77.8 V / 86.0 V at IT = 1 mA - Confirmed avalanche threshold range; determines minimum clamping onset voltage. |
| IPPM | 4.4 A at 10/1000 µs - Peak surge current it safely shunts without failure; directly linked to PCB trace sizing and fuse coordination. |
| VC | ≤113 V at IPPM - Maximum clamped voltage seen by protected circuit; sets upper bound on stress for downstream components. |
| PPPM | 500 W - Peak transient power handling capability; validates suitability for ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 Level 3 surges. |
| TJ max | +175 °C - Maximum junction temperature; enables operation in engine control units and motor drive enclosures without derating. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including HTOL, TC, UHAST, and ESD; required for powertrain and body electronics. |
Pinout & Package
SA70AHE3/54 uses the DO-15 (DO-204AC) axial-leaded package: molded epoxy body, matte tin-plated leads, 0.130–0.138 inch diameter, 1.0 inch minimum lead length. Polarity is marked by a cathode band; the banded end connects to circuit ground or return path during transient suppression.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unbanded end) | Input/Line side | Connects to protected line (e.g., 12 V rail, sensor supply); conducts surge current toward cathode during overvoltage. |
| Cathode (banded end) | Clamp/Return side | Connected to system ground or low-impedance return; establishes reference for clamping action and defines conduction direction. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR across temperature and lifetime; eliminates parameter drift in high-humidity or thermal-cycling environments. |
| 500 W peak pulse power (10/1000 µs) | Supports sustained suppression of automotive load-dump transients without degradation; validated per ISO 7637-2 Clause 4.4. |
| AEC-Q101 qualification | Confirms compliance with automotive stress tests including 1000-cycle temperature cycling and 1000-hour high-temp operating life. |
| Low clamping ratio (VC/VBR ≈ 1.35) | Minimizes voltage overshoot during surge events; protects 75 V-rated MOSFETs and CAN transceivers without overdesigning downstream TVS stages. |
| Matte tin-plated leads | Guarantees solderability per J-STD-002 and whisker resistance per JESD 201 Class 2 (HE3 suffix); suitable for lead-free reflow and long-term storage. |
Applications
| Automotive Power Distribution | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V supply rails in engine control modules from load-dump spikes (up to 60 V, 400 ms). IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery input and DC/DC converter input stage. Use Value: Clamps transients to ≤113 V within nanoseconds, preventing latch-up or gate oxide damage in buck controllers rated for 80 V input. | Use Scenario: Shielding analog output lines (e.g., 4–20 mA current loop) from ESD and relay-coil kickback in PLC I/O modules. IC Role / Device Role / Timing Role: Series-connected TVS on transmitter output, referenced to local ground. Use Value: Limits induced voltage to <113 V during 1 kV/50 Ω EFT bursts, preserving ADC reference integrity and op-amp input stage reliability. |
| Motor Drive Gate Driver Protection | Telecom Line Card Surge Suppression |
Use Scenario: Safeguarding high-side N-channel MOSFET gate drivers in BLDC inverters exposed to shoot-through-induced voltage spikes. IC Role / Device Role / Timing Role: TVS across gate-source terminals of power MOSFETs to clamp Miller-induced overshoot. Use Value: Responds in <1 ns to suppress >100 V spikes, preventing false turn-on and reducing gate driver IC failure rate in 48 V traction systems. | Use Scenario: Front-end protection for Ethernet PHY interfaces on base station line cards subjected to lightning-induced surges on copper pairs. IC Role / Device Role / Timing Role: Primary unidirectional TVS on DC bias feed line upstream of choke and common-mode choke. Use Value: Handles 500 W surges per IEC 61000-4-5 Combination Wave (10/700 µs), maintaining signal integrity while limiting coupled energy into PHY silicon. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ70A-E3/52 (Vishay) | Same VWM (70 V), but SMB package (surface-mount); 500 W rating, VC = 113 V, IPPM = 4.4 A - identical electrical performance. | Requires PCB redesign for SMD layout; better thermal performance in high-density boards; not axial-leaded. | Select when automated assembly, space constraints, or improved thermal coupling to copper pour are prioritized over through-hole serviceability. |
| P6SMB70A (Littelfuse) | VWM = 70 V, VBR = 77.8–86.0 V, VC = 113 V, IPPM = 4.4 A - functionally matched; AEC-Q101 qualified; same SMB footprint. | Drop-in replacement for SMBJ70A; no change to schematic or layout; minor variation in leakage (<2 µA vs. <1 µA). | Choose for dual-sourcing flexibility in SMD designs where Vishay SMBJ70A allocation is constrained. |
Compared with SA70AHE3/54, the SMBJ70A-E3/52 offers identical protection specs in a surface-mount format ideal for automated production, while P6SMB70A provides second-source assurance for that SMD variant-neither replaces SA70AHE3/54 in through-hole applications without mechanical redesign.
Availability
SA70AHE3/54 is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interface protection, motor drive gate driver safeguarding, and telecom line card surge suppression requiring stable component supply across extended production lifecycles.
Supply support for SA70AHE3/54 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, efficiency, and automotive-grade qualification.
The SAxxA series is engineered for rugged transient suppression in harsh environments, targeting automotive, industrial, and telecom applications where fast clamping, high surge endurance, and AEC-Q101 compliance are mandatory.
FAQ
What is the maximum clamping voltage of the SA70AHE3/54 under rated surge conditions?
The SA70AHE3/54 clamps to a maximum of 113 V when subjected to its rated 4.4 A peak pulse current (IPPM) with a 10/1000 µs waveform. This value is measured per standard test conditions (TA = 25 °C) and represents the highest voltage imposed on the protected circuit during transient suppression. The SA70AHE3/54 maintains this clamping performance across its full operating temperature range.
Is the SA70AHE3/54 suitable for automotive applications?
Yes, the SA70AHE3/54 is AEC-Q101 qualified, confirming its suitability for automotive applications including engine control units, body electronics, and ADAS sensor modules. Its DO-15 package, −55 °C to +175 °C operating range, and validated performance under load-dump and EFT stress make it appropriate for under-hood and chassis-mounted systems. The SA70AHE3/54 meets automotive reliability requirements without derating.
What does the HE3 suffix indicate in SA70AHE3/54?
HE3 denotes RoHS-compliant construction with AEC-Q101 qualification and JESD 201 Class 2 whisker resistance for the matte tin-plated leads. Unlike the E3 suffix (commercial grade, Class 1A whisker test), HE3 confirms enhanced process controls for automotive use. The SA70AHE3/54's HE3 marking is integral to its qualification for safety-critical vehicle subsystems.
How does the SA70AHE3/54 compare to bidirectional TVS diodes like SA70CA?
The SA70AHE3/54 is unidirectional and conducts only during reverse overvoltage, making it ideal for DC supply rail protection where polarity is fixed. In contrast, SA70CA is bidirectional and suppresses surges of either polarity-used in AC lines or differential data paths. The SA70AHE3/54 offers lower leakage (<1.0 µA) and tighter VBR tolerance than SA70CA, but cannot replace it in symmetrical signal protection.
What is the peak forward surge current rating for the SA70AHE3/54?
The SA70AHE3/54 is rated for 70 A peak forward surge current (IFSM) using a 10 ms single half-sine waveform, per JEDEC standards. This rating applies only to unidirectional operation and supports robustness against high-energy inductive turn-off events. The SA70AHE3/54 sustains this surge without parametric shift or bond-wire failure when mounted per recommended lead spacing and thermal relief guidelines.
SA70AHE3/54 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:
- -
- 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)
SA70AHE3/54 FAQ
1.How can I place an order for SA70AHE3/54 through Aetrix?
Please submit a Request for Quotation (RFQ) for SA70AHE3/54 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 SA70AHE3/54 reliable?
The price and inventory of SA70AHE3/54 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA70AHE3/54 is usually 5 days.
3.What payment methods are accepted for SA70AHE3/54?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA70AHE3/54 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA70AHE3/54?
SA70AHE3/54 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA70AHE3/54 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 SA70AHE3/54?
For technical support, including SA70AHE3/54 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA70AHE3/54 requirements.
6.How does Aetrix verify that SA70AHE3/54 is sourced from the original manufacturer or authorized distributors?
All SA70AHE3/54 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 SA70AHE3/54 meets industry standards.
7.What is the process for return or replacement of SA70AHE3/54?
All SA70AHE3/54 units undergo pre-shipment inspection (PSI). If there is an issue with SA70AHE3/54, 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 SA70AHE3/54 part is unused and in its original packaging.
Return procedure for SA70AHE3/54:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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