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Vishay General Semiconductor - Diodes Division SA8.5CA-E3/54
- Part No.:
- SA8.5CA-E3/54
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA8.5CA-E3/54.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,540
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Product details
Overview
SA8.5CA-E3/54 from Vishay General Semiconductor is a bidirectional Transient Voltage Suppressor (TVS) diode in DO-15 package, designed for clamping voltage transients on signal or power lines. It features 500 W peak pulse power (10/1000 μs), 8.5 V stand-off voltage (VWM), 14.4 V maximum clamping voltage (VC) at 34.7 A peak pulse current, and AEC-Q101 qualification for automotive-grade reliability.
For engineers reviewing the SA8.5CA-E3/54 datasheet, SA8.5CA-E3/54 pinout, SA8.5CA-E3/54 application, or SA8.5CA-E3/54 equivalent, this device serves as a robust, glass-passivated, bidirectional protection solution for sensitive ICs, MOSFETs, and sensor signal lines in industrial, automotive, and telecom systems where fast response (<1 ns), low clamping ratio, and repeatable surge immunity are critical.
Technical Context
The SA8.5CA-E3/54 operates symmetrically in both directions due to its bidirectional construction, with breakdown voltage (VBR) specified between 9.44 V and 10.4 V at 1 mA test current. Its clamping behavior is defined by a 10/1000 μs waveform, delivering 14.4 V clamping voltage at 34.7 A IPPM - resulting in a clamping ratio of ~1.7× VWM. The device exhibits a temperature coefficient of +8 mV/°C for VBR, ensuring predictable drift over operating range.
It is rated for -55 °C to +175 °C junction temperature, supports 3.0 W steady-state power dissipation at TL = 75 °C, and maintains <1.0 μA reverse leakage at VWM. The DO-15 package enables through-hole mounting with matte tin-plated leads compliant to J-STD-002 and JESD 22-B102 solderability standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - Maximum continuous reverse working voltage before clamping begins; defines safe operating margin for protected circuitry. |
| VBR (min/max) | 9.44 V / 10.4 V at 1 mA - Ensures reliable turn-on across production lot and temperature; guarantees clamping activation above normal operating voltage. |
| VC @ IPPM | 14.4 V at 34.7 A - Limits transient-induced voltage stress on downstream components; low clamping voltage protects 3.3 V and 5 V logic interfaces. |
| PPPM | 500 W (10/1000 μs) - Withstands high-energy surges common in automotive load-dump or inductive switching events without degradation. |
| ID @ VWM | <1.0 μA - Negligible leakage ensures minimal power loss and no interference with low-current sensor or bias networks. |
| TJ max | +175 °C - Enables operation in under-hood automotive environments and high-temperature industrial enclosures without derating. |
| AEC-Q101 | Qualified - Validated for automotive electronics per stress-test requirements including HTOL, TCT, and ESD, supporting functional safety-aware designs. |
Pinout & Package
Package: DO-15 (DO-204AC), axial-leaded, epoxy-molded case with glass-passivated junction. Matte tin-plated leads; no polarity marking (bidirectional).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional transient conduction path | No polarity distinction - either lead may connect to line or ground; enables simple placement in AC-coupled or floating signal paths. |
| Lead 1 / Lead 2 | Current-carrying terminals | Both leads conduct identically during surge; thermal path optimized via 0.375" (9.5 mm) lead length for PCB heat sinking per Fig. 5. |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated chip junction | Enables stable, low-leakage performance over lifetime and temperature; eliminates risk of junction corrosion in humid or contaminated environments. |
| 500 W peak pulse power (10/1000 μs) | Supports IEC 61000-4-5 Level 4 surge immunity (4 kV line-earth) when properly laid out, meeting industrial and automotive EMC requirements. |
| Very fast response time (<1 ns) | Clamps transients before they propagate into IC inputs, protecting against ESD (IEC 61000-4-2) and fast-rising inductive spikes. |
| Low incremental surge resistance | Minimizes VC overshoot during high-di/dt events, preserving voltage margin for 3.3 V microcontrollers and analog front-ends. |
| AEC-Q101 qualified (HE3 variant) | Confirms reliability for automotive applications; SA8.5CA-E3/54 is commercial-grade, but shares identical die and process with qualified HE3 version. |
Applications
| Automotive Sensor Signal Protection | Industrial PLC Input Protection |
|---|---|
Use Scenario: Protecting CAN, LIN, or analog sensor lines (e.g., pressure, temperature) from load-dump and ISO 7637-2 pulses in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional clamping element placed between signal line and chassis ground, absorbing ±100 V transients within nanoseconds. Use Value: Prevents latch-up or gate oxide damage in downstream op-amps and transceivers while maintaining signal integrity below 10.4 V under normal operation. |
Use Scenario: Shielding 24 V DC digital input channels in programmable logic controllers from relay coil flyback and field-wiring surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp on dry-contact or optocoupler input stage, shunting >30 A transients away from series resistors and MCU GPIOs. Use Value: Eliminates need for external RC snubbers; enables direct interface to ruggedized industrial field wiring without additional protection stages. |
| Telecom Line Interface Protection | Consumer Power Adapter Output Clamping |
Use Scenario: Safeguarding Ethernet PHY or RS-485 transceiver pins against lightning-induced surges on outdoor cabling in base stations or network switches. IC Role / Device Role / Timing Role: Secondary-level TVS placed after gas discharge tube (GDT) or primary MOV, providing low-clamp refinement for sub-15 V logic rails. Use Value: Reduces residual clamping voltage to 14.4 V - compatible with 12 V tolerant PHYs and avoids false triggering of internal protection circuits. |
Use Scenario: Suppressing output voltage overshoot during hot-plug or capacitor charging transients in USB-C PD and multi-output AC/DC adapters. IC Role / Device Role / Timing Role: Output-side transient limiter on regulated 5 V/9 V/15 V rails, clamping switch-node ringing and regulator instability events. Use Value: Prevents overvoltage damage to connected devices during startup or fault conditions; complements OVP and current-limit protection schemes. |
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 | Same VWM (8.5 V), lower PPPM (400 W), SMA package (SMT), unidirectional only | Requires external polarity management; unsuitable for AC or floating lines without added diodes | Select SMAJ8.5A only for space-constrained PCBs where unidirectional protection suffices and reflow assembly is preferred. |
| 1.5KE8.5CA | Same VWM and bidirectionality, higher PPPM (1500 W), DO-201 package (larger, higher thermal mass) | Overkill for 500 W requirement; introduces longer lead inductance and larger footprint | Choose 1.5KE8.5CA only when legacy board design mandates DO-201 or system-level surge testing exceeds 500 W compliance. |
Compared with SMAJ8.5A and 1.5KE8.5CA, SA8.5CA-E3/54 delivers optimal balance of 500 W surge handling, DO-15 through-hole robustness, bidirectional symmetry, and AEC-Q101-aligned process - making it ideal for new automotive and industrial designs requiring proven reliability without SMT complexity or oversized packaging.
Availability
SA8.5CA-E3/54 is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC input stages, telecom line interfaces, and consumer power adapter output protection requiring stable component supply and long-term manufacturability.
Supply support for SA8.5CA-E3/54 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 application-specific optimization.
The SAxxCA series targets board-level transient suppression in harsh environments, with design focus on automotive-grade surge resilience, low clamping voltage, and compatibility with standard through-hole assembly processes.
FAQ
What is the clamping voltage of SA8.5CA-E3/54 at its rated peak pulse current?
The SA8.5CA-E3/54 has a maximum clamping voltage (VC) of 14.4 V at 34.7 A peak pulse current (IPPM) under the standard 10/1000 μs waveform. This value is guaranteed across temperature and production lots, and reflects the upper limit of voltage seen by protected circuitry during worst-case surge events. The SA8.5CA-E3/54 achieves this with minimal overshoot due to its low incremental surge resistance.
Is SA8.5CA-E3/54 suitable for automotive applications?
Yes - the SA8.5CA-E3/54 shares the same die and process as the AEC-Q101-qualified SA8.5CAHE3/54 variant. While the E3 suffix denotes commercial grade, its electrical specs, thermal rating (TJ = 175 °C), and construction fully meet automotive environmental demands. For production automotive use, the HE3 version is certified, but SA8.5CA-E3/54 is widely deployed in pre-production and non-safety-critical modules where cost and availability are prioritized.
How does SA8.5CA-E3/54 differ from unidirectional SA8.5A-E3/54?
The SA8.5CA-E3/54 is bidirectional with symmetrical clamping in both polarities and no cathode marking, whereas SA8.5A-E3/54 is unidirectional with a cathode band and conducts only in reverse bias. The CA version supports AC signal lines, differential buses, or floating grounds where polarity is undefined; the A version requires correct orientation and is used for DC rail-to-ground protection. Their VWM, VBR, and VC values are otherwise matched.
What is the reverse leakage current of SA8.5CA-E3/54 at 8.5 V?
At VWM = 8.5 V and TA = 25 °C, the SA8.5CA-E3/54 exhibits a maximum reverse leakage current (ID) of 1.0 μA. This ultra-low leakage ensures negligible power drain in battery-powered systems and prevents signal distortion in high-impedance sensor interfaces. Leakage remains below 5 μA up to 80 % of VWM, supporting stable bias networks.
Can SA8.5CA-E3/54 be used in parallel for higher surge capability?
No - SA8.5CA-E3/54 is not characterized or recommended for parallel operation. Mismatches in VBR and dynamic impedance cause uneven current sharing during transients, risking thermal runaway in one device. For higher power handling, select a single higher-rated part such as SA12CA-E3/54 (500 W, 12 V) or use staged protection (e.g., GDT + SA8.5CA-E3/54). The SA8.5CA-E3/54 datasheet provides no derating guidance for paralleling.
SA8.5CA-E3/54 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):
- 8.5V
- Voltage - Breakdown (Min):
- 9.44V
- Voltage - Clamping (Max) @ Ipp:
- 14.4V
- Current - Peak Pulse (10/1000µs):
- 34.7A
- Power - Peak Pulse:
- 500W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AC (DO-15)
SA8.5CA-E3/54 FAQ
1.How can I place an order for SA8.5CA-E3/54 through Aetrix?
Please submit a Request for Quotation (RFQ) for SA8.5CA-E3/54 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 SA8.5CA-E3/54 reliable?
The price and inventory of SA8.5CA-E3/54 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA8.5CA-E3/54 is usually 5 days.
3.What payment methods are accepted for SA8.5CA-E3/54?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA8.5CA-E3/54 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA8.5CA-E3/54?
SA8.5CA-E3/54 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA8.5CA-E3/54 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 SA8.5CA-E3/54?
For technical support, including SA8.5CA-E3/54 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA8.5CA-E3/54 requirements.
6.How does Aetrix verify that SA8.5CA-E3/54 is sourced from the original manufacturer or authorized distributors?
All SA8.5CA-E3/54 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 SA8.5CA-E3/54 meets industry standards.
7.What is the process for return or replacement of SA8.5CA-E3/54?
All SA8.5CA-E3/54 units undergo pre-shipment inspection (PSI). If there is an issue with SA8.5CA-E3/54, 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 SA8.5CA-E3/54 part is unused and in its original packaging.
Return procedure for SA8.5CA-E3/54:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SA8.5CA-E3/54 Tags
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