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Vishay General Semiconductor - Diodes Division SA85AHE3/54
- Part No.:
- SA85AHE3/54
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA85AHE3/54.pdf
- Description:
- TVS DIODE 85VWM 137VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,597
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Product details
Overview
SA85AHE3/54 from Vishay General Semiconductor is a unidirectional Transient Voltage Suppressor (TVS) diode in DO-15 package, designed for circuit protection against ESD and surge transients. It features 85 V standoff voltage (VWM), 94.4–104 V breakdown voltage (VBR) at 1 mA, 137 V clamping voltage (VC) at 3.6 A peak pulse current, and 500 W peak pulse power rating with 10/1000 μs waveform - deployed in automotive sensor signal lines and industrial I/O interfaces.
For engineers reviewing the SA85AHE3/54 datasheet, SA85AHE3/54 pinout, SA85AHE3/54 application, or SA85AHE3/54 equivalent, this page delivers verified electrical specs, AEC-Q101 qualification status, DO-15 mechanical data, clamping performance under surge conditions, and direct alternatives for board-level transient protection design.
Technical Context
The SA85AHE3/54 operates as a unidirectional avalanche diode, triggering conduction when reverse voltage exceeds its 94.4–104 V breakdown range. Its glass-passivated junction enables fast response (<1 ns) and low incremental surge resistance, critical for suppressing inductive switching spikes on 12 V/24 V automotive buses.
Rated for -55 °C to +175 °C junction temperature and qualified to AEC-Q101, it sustains 70 A non-repetitive forward surge current (IFSM) and maintains 1.0 μA max reverse leakage at 85 V, supporting robust operation in engine control units and motor drive feedback paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off) | 85 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR (Breakdown) | 94.4–104 V at 1 mA - Confirmed avalanche initiation range for reliable overvoltage detection |
| VC (Clamping) | 137 V at IPPM = 3.6 A - Peak voltage seen by protected IC during 10/1000 μs surge |
| PPPM | 500 W - Sustained transient energy absorption capability per JEDEC standard waveform |
| IFSM | 70 A - Withstands single half-sine surge without degradation in motor driver gate-drive paths |
| TJ max | +175 °C - Enables placement near high-temperature components like power MOSFETs |
| Leakage ID | 1.0 μA at 85 V - Minimal loading on low-power sensor bias networks |
Pinout & Package
Package: DO-15 (DO-204AC), axial leaded, epoxy-molded case with matte tin-plated leads compliant to J-STD-002 and JESD 22-B102. Cathode indicated by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Surge return path | Connected to ground or low-impedance return plane for bidirectional suppression reference |
| Cathode | Reverse-biased clamping node | Connected to protected line (e.g., CAN_H, LIN, sensor output); color band identifies this terminal |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Enables <1 ns response time and stable VBR over 1000+ surge events |
| AEC-Q101 qualification (HE3 suffix) | Validated for automotive under-hood applications including powertrain and ADAS sensor modules |
| 500 W peak pulse power (10/1000 μs) | Protects against ISO 7637-2 Pulse 1, 2a, 3a/b and IEC 61000-4-5 Level 3 surges |
| Low clamping ratio (VC/VBR ≈ 1.35) | Minimizes voltage overshoot across protected ICs - critical for 3.3 V/5 V logic interfaces |
| RoHS-compliant, whisker-tested (JESD 201 Class 2) | Ensures long-term solder joint reliability in reflow and thermal cycling environments |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting analog outputs of pressure/temperature sensors in engine control modules exposed to load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between sensor output and microcontroller ADC input to clamp transients before damage occurs. Use Value: Limits voltage excursion to ≤137 V during 3.6 A surge, preserving 12-bit ADC accuracy and preventing latch-up in downstream MCU. | Use Scenario: Safeguarding 24 V digital input channels on programmable logic controllers interfacing with solenoid valves and limit switches. IC Role / Device Role / Timing Role: Front-end transient suppressor on each isolated input channel, referenced to system ground. Use Value: Absorbs repetitive 500 W surges from inductive kickback without derating, enabling >100,000 cycle field life. |
| Motor Drive Feedback Protection | Telecom Power Supply Clamp |
Use Scenario: Shielding Hall-effect rotor position feedback signals in BLDC motor drivers subject to commutation noise and EFT bursts. IC Role / Device Role / Timing Role: Low-capacitance TVS on differential encoder lines, minimizing signal distortion while clamping common-mode spikes. Use Value: 1.0 μA leakage at 85 V avoids DC offset errors; fast response preserves edge integrity of 100 kHz square-wave timing signals. | Use Scenario: Secondary-side clamping on 48 V telecom rectifier outputs to protect DC-DC converters from lightning-induced surges. IC Role / Device Role / Timing Role: Standoff-rated TVS across output rails to limit overvoltage during AC line transients coupled through transformer parasitics. Use Value: 137 V clamping ensures downstream 50 V-rated DC-DC controllers remain within absolute maximum ratings during 10/1000 μs events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ85A-E3/52 | Same VWM/VBR/VC specs but in SMA (DO-214AC) package; 1.5 W steady-state vs. 3.0 W for SA85AHE3/54 | Surface-mount layout; lower thermal mass limits sustained surge duty cycle | Select for space-constrained PCBs where reflow compatibility and automated assembly outweigh higher thermal derating needs |
| 1.5KE85A | Higher PPPM (1500 W), larger DO-201AD package, no AEC-Q101 qualification, VF = 3.5 V at 100 A | Non-automotive industrial power supply protection requiring higher single-pulse energy handling | Choose when surge energy exceeds 500 W and automotive qualification is not required |
Compared with SMAJ85A-E3/52 and 1.5KE85A, the SA85AHE3/54 uniquely combines AEC-Q101 qualification, 3.0 W steady-state dissipation in axial DO-15, and validated 70 A IFSM - making it optimal for automotive body electronics where thermal margin and qualification compliance are mandatory.
Availability
SA85AHE3/54 is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, and motor drive feedback circuits requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SA85AHE3/54 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, and protection devices with emphasis on reliability and automotive-grade validation.
The SAxxA series is engineered specifically for robust transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where failure due to voltage surges must be eliminated.
FAQ
What is the clamping voltage of SA85AHE3/54 and how is it measured?
The SA85AHE3/54 has a maximum clamping voltage (VC) of 137 V, measured at a peak pulse current (IPPM) of 3.6 A using the standardized 10/1000 μs double-exponential waveform. This value represents the highest voltage imposed on the protected circuit during surge conduction and is confirmed per JEDEC test method. The SA85AHE3/54 maintains this clamping performance across its rated temperature range (-55 °C to +175 °C).
Is SA85AHE3/54 qualified for automotive use?
Yes, SA85AHE3/54 carries the HE3 suffix, indicating full AEC-Q101 qualification per Vishay's documentation (Document Number 88378, Revision 27-Sep-2021). This includes stress testing for temperature cycling, humidity, mechanical shock, and surge endurance - validating its suitability for under-hood and chassis-mounted automotive applications such as engine control units and ADAS sensor interfaces.
What does the "HE3/54" suffix mean in SA85AHE3/54?
The "HE3" denotes RoHS-compliant construction with JESD 201 Class 2 whisker resistance and AEC-Q101 qualification; "/54" specifies packaging in 13-inch paper tape and reel with 4000 units per reel. This ordering code ensures traceable, automotive-grade material with verified plating integrity and thermal performance - distinct from commercial-grade E3-only variants.
Can SA85AHE3/54 be used in bidirectional protection circuits?
No, SA85AHE3/54 is a unidirectional TVS diode, intended for DC-biased lines where polarity is fixed (e.g., 12 V supply rails or sensor outputs referenced to ground). For bidirectional AC or floating signal lines (e.g., RS-485, CAN), the SA85CA variant - with symmetrical breakdown in both directions - must be selected instead. Using SA85AHE3/54 in bidirectional roles risks failure during positive half-cycles.
What is the thermal derating behavior of SA85AHE3/54 above 25 °C ambient?
SA85AHE3/54 follows a linear derating curve from 3.0 W at TL = 75 °C down to zero at TJ = 175 °C, per Figure 5 in the datasheet. At 100 °C lead temperature, its steady-state power dissipation drops to ~2.1 W. Designers must ensure adequate lead length (≥9.5 mm) and PCB copper area to maintain thermal resistance below 42 °C/W for reliable operation in high-temperature enclosures.
SA85AHE3/54 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):
- 85V
- Voltage - Breakdown (Min):
- 94.4V
- Voltage - Clamping (Max) @ Ipp:
- 137V
- Current - Peak Pulse (10/1000µs):
- 3.6A
- 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)
SA85AHE3/54 FAQ
1.How can I place an order for SA85AHE3/54 through Aetrix?
Please submit a Request for Quotation (RFQ) for SA85AHE3/54 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 SA85AHE3/54 reliable?
The price and inventory of SA85AHE3/54 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA85AHE3/54 is usually 5 days.
3.What payment methods are accepted for SA85AHE3/54?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA85AHE3/54 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA85AHE3/54?
SA85AHE3/54 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA85AHE3/54 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 SA85AHE3/54?
For technical support, including SA85AHE3/54 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA85AHE3/54 requirements.
6.How does Aetrix verify that SA85AHE3/54 is sourced from the original manufacturer or authorized distributors?
All SA85AHE3/54 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 SA85AHE3/54 meets industry standards.
7.What is the process for return or replacement of SA85AHE3/54?
All SA85AHE3/54 units undergo pre-shipment inspection (PSI). If there is an issue with SA85AHE3/54, 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 SA85AHE3/54 part is unused and in its original packaging.
Return procedure for SA85AHE3/54:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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