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Vishay General Semiconductor - Diodes Division SA8.5HE3/73
- Part No.:
- SA8.5HE3/73
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA8.5HE3/73.pdf
- Description:
- TVS DIODE 8.5VWM 15.9VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,109
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Product details
Overview
SA8.5HE3/73 from Vishay General Semiconductor is a uni-directional 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 500 W peak pulse power (10/1000 μs), 8.5 V stand-off voltage (VWM), 9.44–10.4 V breakdown voltage (VBR at 1 mA), 14.4 V maximum clamping voltage (VC) at 34.7 A IPPM, and AEC-Q101 qualification for automotive use.
For engineers reviewing the SA8.5HE3/73 datasheet, SA8.5HE3/73 pinout, SA8.5HE3/73 application, or SA8.5HE3/73 equivalent, this device is selected for robust ESD and surge immunity in 12 V automotive subsystems, industrial sensor interfaces, and low-voltage DC power input stages where fast response (<1 ns), low clamping ratio, and high surge current tolerance are critical.
Technical Context
The SA8.5HE3/73 operates as a uni-directional avalanche diode with glass-passivated junction, enabling stable reverse-biased clamping above VWM while blocking up to 8.5 V in normal operation. Its 10/1000 μs waveform rating reflects standardized lightning/surge immunity testing per IEC 61000-4-5 Level 3–4 requirements.
Clamping performance is defined by VC = 14.4 V at IPPM = 34.7 A, yielding a clamping ratio (VC/VWM) of 1.69 - indicating efficient voltage limiting without excessive overshoot. Thermal derating follows a linear curve from 3.0 W at TL = 75 °C down to zero at TJ = 175 °C, supporting reliable operation in under-hood environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - Maximum continuous reverse operating voltage before clamping begins; sets safe margin below 12 V nominal rail. |
| VBR (min/max) | 9.44 V / 10.4 V at IT = 1 mA - Confirmed avalanche onset range; ensures predictable turn-on across temperature and lot variation. |
| VC @ IPPM | 14.4 V at 34.7 A - Clamped voltage during 10/1000 μs surge; protects downstream ICs rated ≤16 V absolute max. |
| PPPM | 500 W - Peak transient energy handling capability; supports IEC 61000-4-5 1 kV/2 kV surge compliance with external impedance. |
| IFSM | 70 A - Non-repetitive forward surge rating; enables survival of accidental polarity reversal or load dump transients. |
| TJ max. | 175 °C - Junction temperature limit; allows direct mounting on PCBs near heat sources in automotive ECUs. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including HTOL, TC, UHAST, and mechanical shock per stress test plan. |
Pinout & Package
Package: DO-204AC (DO-15), axial-leaded, molded epoxy case with matte tin-plated leads. Polarity marked by cathode band; anode and cathode terminals are non-symmetrical and orientation-critical for uni-directional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Forward current entry / low-side reference | Connected to ground or lower-potential node; defines clamping path to return during overvoltage events. |
| Cathode (banded end) | Reverse-biased clamping node | Connected to protected line (e.g., 12 V supply); conducts when voltage exceeds VWM to shunt surge current. |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Ensures stable VBR and leakage (ID ≤ 10 μA at VWM) over 15+ years in humid, high-vibration environments. |
| 500 W peak pulse power (10/1000 μs) | Meets ISO 7637-2 Pulse 1, 2a, 3a/b and IEC 61000-4-5 2nd edition surge immunity requirements for Class A/B systems. |
| AEC-Q101 qualification | Validates suitability for engine control modules, body electronics, and ADAS sensors without additional qualification effort. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (e.g., inductive switch-off), improving protection margin for 3.3 V/5 V logic. |
| RoHS-compliant HE3 suffix | Indicates JESD 201 Class 2 whisker resistance and full compliance with EU RoHS Directive 2011/65/EU for automotive supply chains. |
Applications
| Automotive Power Input Protection | Industrial Sensor Signal Line Clamp |
|---|---|
Use Scenario: 12 V battery-fed ECU power input exposed to load dump (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Primary clamping element placed upstream of LDOs and microcontrollers to limit rail voltage to ≤14.4 V. Use Value: Prevents latch-up or oxide breakdown in 16 V-rated power management ICs during 35 V/100 ms load dump events. |
Use Scenario: Analog output line (e.g., 4–20 mA loop or 0–5 V sensor) routed through noisy factory floor wiring. IC Role / Device Role / Timing Role: Low-capacitance (≈100 pF) uni-directional clamp referenced to system ground, suppressing ESD and cable discharge events. Use Value: Maintains signal integrity below 1% error while surviving ±8 kV contact ESD (IEC 61000-4-2) without degradation. |
| DC Motor Driver Flyback Suppression | USB Port VBUS Overvoltage Guard |
Use Scenario: H-bridge motor driver with inductive back-EMF spikes during PWM commutation. IC Role / Device Role / Timing Role: Snubber-connected TVS across motor terminals or supply rail to absorb flyback energy. Use Value: Limits voltage overshoot to <15 V, preventing gate oxide failure in 20 V-rated MOSFETs and reducing radiated emissions. |
Use Scenario: USB 2.0 host port powered from 5 V rail subject to hot-plug surges and adapter fault conditions. IC Role / Device Role / Timing Role: Uni-directional clamp between VBUS and GND, activated only during overvoltage (not during normal 4.75–5.25 V operation). Use Value: Blocks >5.5 V transients before they reach USB controller PHY, preserving enumeration and avoiding bus reset. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ8.5A-E3/5A | Same VWM (8.5 V), identical DO-214AC (SMA) package; 400 W PPPM (vs. 500 W), higher VC (14.4 V same), slightly higher ID (25 μA vs. 10 μA). | Lower surge rating limits use in high-energy automotive load dump; better suited for space-constrained consumer PCBs. | Select SMAJ8.5A-E3/5A only if board area is constrained and surge threat level is ≤IEC 61000-4-5 0.5 kV. |
| P6SMB8.5A | Same VWM and DO-214AA (SMB) package; 600 W PPPM; VC = 13.6 V at 37.1 A; no AEC-Q101 qualification. | Higher surge capacity but unqualified for automotive; requires separate reliability validation for automotive deployment. | Choose P6SMB8.5A for industrial power supplies needing extra margin, but avoid in AEC-Q101-mandated designs unless re-qualified. |
Compared with SA8.5HE3/73, SMAJ8.5A-E3/5A trades 100 W surge headroom for smaller footprint, while P6SMB8.5A offers higher energy handling but lacks automotive qualification - making SA8.5HE3/73 the optimal balance of AEC-Q101 compliance, 500 W rating, and DO-15 through-hole manufacturability.
Availability
SA8.5HE3/73 is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interface modules, and DC motor drive protection requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SA8.5HE3/73 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, MOSFETs, and passive components with emphasis on reliability, efficiency, and automotive-grade qualification.
The SAxxA series is engineered specifically for transient overvoltage protection in harsh environments - targeting automotive, industrial, and telecom infrastructure where robustness against ESD, lightning, and inductive switching surges is mandatory.
FAQ
What is the clamping voltage of SA8.5HE3/73 and how does it protect downstream circuits?
The SA8.5HE3/73 has a maximum clamping voltage (VC) of 14.4 V at 34.7 A peak pulse current (IPPM) under 10/1000 μs waveform conditions. This means that during a surge event, the device limits the voltage seen by downstream components to no more than 14.4 V - well below the 16 V absolute maximum rating of many automotive-grade power ICs. Its fast avalanche response (<1 ns) ensures protection occurs before sensitive circuitry sustains damage, making SA8.5HE3/73 ideal for safeguarding 12 V rail interfaces in ECUs and body controllers.
Is SA8.5HE3/73 suitable for automotive applications and what qualifications does it hold?
Yes, SA8.5HE3/73 is explicitly AEC-Q101 qualified, as confirmed by Vishay's documentation and the HE3 suffix designation. It meets stress tests including high-temperature operating life (HTOL), temperature cycling (TC), unbiased highly accelerated stress test (UHAST), and mechanical shock - all required for under-hood and chassis-mounted automotive electronics. The SA8.5HE3/73 is routinely deployed in engine management, lighting control, and ADAS sensor modules where reliability under thermal and vibration stress is non-negotiable.
How does the SA8.5HE3/73 differ from bi-directional TVS diodes like SA8.5CA?
The SA8.5HE3/73 is a uni-directional TVS diode, meaning it clamps only in reverse bias (cathode positive) and blocks forward current up to its VF spec (~3.5 V at 100 A). In contrast, SA8.5CA is bi-directional and clamps symmetrically in both polarities - useful for AC lines or data buses. SA8.5HE3/73 is preferred for DC power rail protection because it avoids forward conduction during normal operation and provides tighter leakage control (≤10 μA at 8.5 V), whereas SA8.5CA exhibits higher reverse leakage in both directions and lacks forward surge rating (IFSM).
What is the package type and lead finish of SA8.5HE3/73, and why does it matter for manufacturing?
The SA8.5HE3/73 uses the DO-204AC (DO-15) axial package with matte tin-plated leads compliant with J-STD-002 and JESD 22-B102 solderability standards. The HE3 suffix confirms JESD 201 Class 2 whisker resistance - essential for automotive applications where tin whisker growth could cause latent field failures. Its 0.432 g unit weight and standard lead spacing simplify wave soldering and manual rework, and the molded UL 94 V-0 epoxy body ensures flame resistance in enclosed enclosures - all verified characteristics of SA8.5HE3/73.
Can SA8.5HE3/73 be used in place of SA8.0A or SA9.0A, and what design considerations apply?
SA8.5HE3/73 is not a drop-in replacement for SA8.0A (VWM = 8.0 V) or SA9.0A (VWM = 9.0 V) due to its specific 8.5 V stand-off voltage - substituting requires verifying that the protected circuit's normal operating voltage remains safely within the 10–20 % margin below VWM. For example, SA8.5HE3/73 is optimal for 12 V nominal rails with ±10 % tolerance (10.8–13.2 V), whereas SA8.0A suits tighter 12 V systems and SA9.0A fits 13.5 V auxiliary supplies. All three share identical PPPM, package, and qualification - only VWM and corresponding VBR/VC differ, so SA8.5HE3/73 selection must align with actual rail stability and surge threat profile.
SA8.5HE3/73 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):
- 8.5V
- Voltage - Breakdown (Min):
- 9.44V
- Voltage - Clamping (Max) @ Ipp:
- 15.9V
- Current - Peak Pulse (10/1000µs):
- 31.4A
- 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)
SA8.5HE3/73 FAQ
1.How can I place an order for SA8.5HE3/73 through Aetrix?
Please submit a Request for Quotation (RFQ) for SA8.5HE3/73 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 SA8.5HE3/73 reliable?
The price and inventory of SA8.5HE3/73 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA8.5HE3/73 is usually 5 days.
3.What payment methods are accepted for SA8.5HE3/73?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA8.5HE3/73 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA8.5HE3/73?
SA8.5HE3/73 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA8.5HE3/73 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 SA8.5HE3/73?
For technical support, including SA8.5HE3/73 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA8.5HE3/73 requirements.
6.How does Aetrix verify that SA8.5HE3/73 is sourced from the original manufacturer or authorized distributors?
All SA8.5HE3/73 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 SA8.5HE3/73 meets industry standards.
7.What is the process for return or replacement of SA8.5HE3/73?
All SA8.5HE3/73 units undergo pre-shipment inspection (PSI). If there is an issue with SA8.5HE3/73, 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 SA8.5HE3/73 part is unused and in its original packaging.
Return procedure for SA8.5HE3/73:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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