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Vishay General Semiconductor - Diodes Division SA85CAHE3/54
- Part No.:
- SA85CAHE3/54
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA85CAHE3/54.pdf
- Description:
- TVS DIODE 85VWM 137VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,620
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Product details
Overview
SA85CAHE3/54 from Vishay General Semiconductor is a bidirectional TransZORB® transient voltage suppressor (TVS) diode in DO-15 package, rated for 500 W peak pulse power (10/1000 μs), 85 V stand-off voltage (VWM), and clamping voltage of 137 V at 3.6 A peak pulse current. It provides AEC-Q101 qualification and protects signal lines in automotive sensor units against inductive switching transients.
For engineers reviewing the SA85CAHE3/54 datasheet, SA85CAHE3/54 pinout, SA85CAHE3/54 application, or SA85CAHE3/54 equivalent, key selection criteria include bidirectional clamping behavior, DO-15 mechanical compatibility, 175 °C max junction temperature, low incremental surge resistance, and RoHS-compliant AEC-Q101 qualification for automotive-grade reliability.
Technical Context
The SA85CAHE3/54 operates as a bidirectional avalanche diode with symmetrical breakdown characteristics-minimum VBR = 94.4 V and maximum VBR = 104 V at 1 mA test current. Its clamping performance is defined by VC = 137 V at IPPM = 3.6 A under 10/1000 μs waveform, delivering consistent protection in both polarities without polarity marking.
Designed for high-reliability environments, it features glass-passivated chip junction, matte tin-plated leads compliant with J-STD-002 and JESD 22-B102, and meets JESD 201 Class 2 whisker testing (HE3 suffix). Thermal derating follows standard curves up to TL = 75 °C for steady-state dissipation of 3.0 W.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - Maximum continuous reverse operating voltage before clamping begins; defines safe signal line operating margin. |
| VBR (min/max) | 94.4 V / 104 V at 1 mA - Bidirectional breakdown threshold range; ensures predictable turn-on across manufacturing lot. |
| VC @ IPPM | 137 V at 3.6 A - Clamped voltage during 10/1000 μs transient; limits downstream IC stress to safe levels. |
| PPPM | 500 W - Peak pulse power handling per single transient; supports repetitive surges at 0.01 % duty cycle. |
| TJ max | 175 °C - Maximum junction temperature; enables operation in under-hood automotive environments. |
| Package | DO-15 (DO-204AC) - Standard axial-leaded through-hole package; compatible with legacy PCB layouts and wave-soldering. |
| AEC-Q101 | Qualified - Validated for automotive applications including engine control, body electronics, and ADAS sensor interfaces. |
Pinout & Package
DO-15 (DO-204AC) molded epoxy package with axial leads; no polarity marking for bidirectional operation. Leads are matte tin plated, solderable per J-STD-002, and rated for 275 °C dip soldering (10 s max).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional avalanche junction | No designated anode or cathode; terminals interchangeable; clamps equally on positive or negative transients. |
| Lead 1 | Terminal A | Connects to protected line (e.g., CAN_H or LIN bus); forms one side of TVS junction. |
| Lead 2 | Terminal B | Connects to reference (e.g., ground or signal return); completes bidirectional clamping path. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated chip junction | Enables stable avalanche characteristics over temperature and lifetime; eliminates surface leakage paths in humid environments. |
| 500 W peak pulse power (10/1000 μs) | Withstands ISO 7637-2 Pulse 1/2a/3a and IEC 61000-4-5 Level 3 surges without degradation. |
| AEC-Q101 qualification (HE3 suffix) | Validated for automotive use including temperature cycling, humidity bias, and mechanical shock per AEC standard. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (<1 ns response), improving protection fidelity for high-speed interfaces. |
| UL 94 V-0 molding compound | Ensures flame-retardant enclosure integrity in enclosed automotive modules and industrial enclosures. |
Applications
| Automotive Sensor Protection | Industrial CAN Bus Interface |
|---|---|
Use Scenario: Protecting analog output lines of pressure, temperature, and position sensors in engine bay modules exposed to load dump and alternator ripple. IC Role / Device Role / Timing Role: Bidirectional clamping device placed between sensor output and ECU input to limit transient excursions beyond ±137 V. Use Value: Prevents latch-up or gate oxide damage in downstream op-amps and ADC front-ends while maintaining signal integrity below 85 V nominal range. | Use Scenario: Safeguarding CAN_H/CAN_L differential pair in vehicle body control modules subjected to ESD and inductive kickback from solenoid drivers. IC Role / Device Role / Timing Role: Low-capacitance TVS pair (one per line) referenced to chassis ground, absorbing common-mode transients up to 500 W. Use Value: Maintains CAN bit timing integrity by limiting clamping voltage to 137 V without adding >10 pF parasitic capacitance that would distort edge rates. |
| Telecom Line Surge Suppression | Consumer Appliance Motor Control |
Use Scenario: Shielding RS-485 transceivers in building automation gateways from lightning-induced surges on long outdoor runs. IC Role / Device Role / Timing Role: Primary-level protection on data lines upstream of GDT or polymer-based secondary protectors. Use Value: Absorbs first 500 W surge energy within 1 ns, reducing residual voltage seen by secondary protection and extending system MTBF. | Use Scenario: Protecting microcontroller GPIOs and H-bridge gate drivers in smart washing machine control boards from motor commutation spikes. IC Role / Device Role / Timing Role: Point-of-load TVS on 24 V DC supply rail and half-bridge sense lines to clamp flyback voltages. Use Value: Enables reliable operation at 175 °C ambient near motor windings without thermal runaway or parameter drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ85CA | Surface-mount SMB package; same VWM (85 V), slightly lower VC (136 V at 3.7 A); 600 W PPPM. | Requires SMT reflow process; unsuitable for through-hole legacy designs or high-vibration mechanical retention. | Select when board space is constrained and automated assembly is available. |
| 1.5KE85CA | DO-201 package; higher PPPM (1500 W), larger footprint; VC = 139 V at 10.9 A; same VWM/VBR range. | Used where higher single-event energy absorption is required (e.g., power supply inputs), but less suitable for signal-line precision clamping. | Select when surge energy exceeds 500 W or lead-to-lead inductance must be minimized via shorter leads. |
Compared with SMBJ85CA and 1.5KE85CA, the SA85CAHE3/54 offers optimal balance of AEC-Q101 qualification, DO-15 mechanical robustness, and precise 85 V stand-off for signal-line protection-making it preferred for automotive sensor nodes where through-hole reliability and thermal stability are critical.
Availability
SA85CAHE3/54 is available at Aetrix Electronics and suitable for automotive sensor protection, industrial CAN bus interface, and telecom line surge suppression requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SA85CAHE3/54 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 TVS devices with emphasis on reliability, power efficiency, and automotive-grade qualification.
The SAxxCA series is designed specifically for bidirectional transient suppression in harsh environments-targeting automotive, industrial, and telecom applications where robust, standardized, and AEC-Q101-qualified TVS protection is mandatory.
FAQ
What is the clamping voltage of SA85CAHE3/54 and how is it measured?
The SA85CAHE3/54 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 reflects the voltage across the device during worst-case transient events and is guaranteed across its operating temperature range. The SA85CAHE3/54 maintains this clamping performance symmetrically in both directions due to its bidirectional construction.
Is SA85CAHE3/54 suitable for automotive applications?
Yes, SA85CAHE3/54 is AEC-Q101 qualified (denoted by HE3 suffix) and built to withstand automotive environmental stresses including temperature cycling, mechanical shock, and humidity bias. Its DO-15 package, 175 °C max junction temperature, and glass-passivated junction make it appropriate for engine control units, body electronics, and ADAS sensor interfaces where reliability under vibration and thermal cycling is essential.
How does the bidirectional nature of SA85CAHE3/54 affect its circuit implementation?
The SA85CAHE3/54 has no polarity marking and functions identically in either orientation, enabling direct placement across any two nodes subject to bipolar transients-such as differential signal pairs or AC-coupled lines. Unlike unidirectional TVS diodes, it requires no cathode alignment during assembly, simplifying layout and eliminating risk of reverse installation. This symmetry is confirmed by identical VBR and VC specifications in both directions.
What is the meaning of the "HE3/54" suffix in SA85CAHE3/54?
The "HE3" suffix indicates RoHS-compliant construction with AEC-Q101 qualification and JESD 201 Class 2 whisker resistance; "54" denotes the preferred package code for 13-inch paper tape and reel packaging (4000 units per reel). This ordering code ensures traceable, automotive-grade material with verified process controls-distinct from commercial-grade "E3" variants lacking AEC-Q101 validation.
Can SA85CAHE3/54 replace SA85A in existing designs?
No-SA85CAHE3/54 is bidirectional while SA85A is unidirectional, so they are not functionally interchangeable without circuit review. SA85A includes a cathode band and conducts forward current up to 70 A, whereas SA85CAHE3/54 blocks in both directions until breakdown. Substitution would require verifying that the application truly needs symmetrical clamping and that no DC bias path exists that could forward-bias the SA85CAHE3/54 unintentionally.
SA85CAHE3/54 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:
- -
- Bidirectional Channels:
- 1
- 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)
SA85CAHE3/54 FAQ
1.How can I place an order for SA85CAHE3/54 through Aetrix?
Please submit a Request for Quotation (RFQ) for SA85CAHE3/54 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 SA85CAHE3/54 reliable?
The price and inventory of SA85CAHE3/54 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA85CAHE3/54 is usually 5 days.
3.What payment methods are accepted for SA85CAHE3/54?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA85CAHE3/54 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA85CAHE3/54?
SA85CAHE3/54 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA85CAHE3/54 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 SA85CAHE3/54?
For technical support, including SA85CAHE3/54 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA85CAHE3/54 requirements.
6.How does Aetrix verify that SA85CAHE3/54 is sourced from the original manufacturer or authorized distributors?
All SA85CAHE3/54 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 SA85CAHE3/54 meets industry standards.
7.What is the process for return or replacement of SA85CAHE3/54?
All SA85CAHE3/54 units undergo pre-shipment inspection (PSI). If there is an issue with SA85CAHE3/54, 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 SA85CAHE3/54 part is unused and in its original packaging.
Return procedure for SA85CAHE3/54:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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