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Taiwan Semiconductor Corporation SA85
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- Part No.:
- SA85
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA85.pdf
- Description:
- 500W, 104.7V, 10%, UNIDIRECTIONA
- Quantity:
- Payment:
- Shipping:
Inventory:9,274
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Product details
Overview
SA85 from Taiwan Semiconductor is a unidirectional 500W transient voltage suppressor (TVS) diode in DO-204AC (DO-15) package, with 85V working stand-off voltage (VWM), 94.4–115V breakdown voltage (VBR @ 1mA), and 151V clamping voltage (VC) at 3.4A peak pulse current. It delivers fast response (<1.0ps), low leakage (<1μA @ 85V), and AEC-Q101 qualification for automotive-grade surge protection.
For engineers reviewing the SA85 datasheet, SA85 pinout, SA85 application, or SA85 equivalent, this page provides verified electrical parameters, mechanical package details, real-world use cases in automotive and industrial systems, and validated alternative parts for design flexibility and supply continuity.
Technical Context
The SA85 operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its VBR range (94.4–115V), clamping transients to ≤151V at 3.4A (10/1000μs waveform). Its low dynamic impedance ensures effective energy diversion during ESD and lightning-induced surges.
Designed for single-polarity DC line protection, it features a maximum junction temperature of 175°C, RoHS-compliant halogen-free molding compound, and pure tin-plated leads meeting J-STD-002 solderability standards - supporting reflow and wave soldering in high-reliability assemblies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - Maximum continuous reverse operating voltage before conduction begins; defines safe DC bias margin. |
| VBR min/max | 94.4 V / 115 V @ 1 mA - Confirmed breakdown threshold range; ensures predictable turn-on across production lots. |
| VC @ IPPM | 151 V @ 3.4 A - Clamped voltage during 10/1000μs surge; limits downstream IC stress to safe levels. |
| PPK | 500 W - Peak pulse power rating per 10/1000μs waveform; supports IEC 61000-4-5 Level 4 immunity. |
| IR @ VWM | <1 μA - Reverse leakage at 85 V; negligible standby power loss and minimal signal path loading. |
| TJ max | 175 °C - Maximum junction temperature; enables operation in under-hood automotive environments. |
| Package | DO-204AC (DO-15) - Industry-standard axial leaded package with 0.400 g mass; compatible with legacy through-hole assembly. |
Pinout & Package
DO-204AC (DO-15) package: axial-leaded, molded epoxy case with cathode band marking polarity. Leads are pure tin-plated, solderable per J-STD-002, and meet JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Surge return path | Connected to system ground or low-impedance return; completes clamping loop during transient events. |
| Cathode | Protected line connection / High-side terminal | Connected to the line being protected (e.g., 12V/24V rail); blocks normal operation but conducts during overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and body electronics per stress test requirements. |
| Clamping ratio VC/VBR | ≤1.60 (151 V / 94.4 V) - Tight clamping margin ensures robust protection without overdesigning downstream TVS stages. |
| Response time | <1.0 ps - Enables suppression of nanosecond-scale ESD events before sensitive logic inputs are damaged. |
| Halogen-free & RoHS | Complies with IEC 61249-2-21 and EU RoHS Directive - meets environmental compliance for global OEM shipments. |
| UL 94V-0 rated compound | Flame-retardant encapsulation prevents fire propagation in fault conditions - required for under-hood and battery management systems. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12V/24V supply lines in engine control modules against load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and ground to clamp transients above 85V. Use Value: Limits clamped voltage to 151V, preventing damage to microcontrollers and CAN transceivers rated for ≤160V absolute maximum. | Use Scenario: Safeguarding analog sensor outputs (e.g., pressure, temperature) connected to PLC input cards from inductive switching noise. IC Role / Device Role / Timing Role: Standoff protection on signal lines referenced to local ground, absorbing fast-rising EFT bursts. Use Value: Sub-1μA leakage avoids DC offset errors; <1.0ps response captures sub-nanosecond ESD events before op-amp input stages saturate. |
| LED Driver Overvoltage Clamp | DC Power Supply Input Stage |
Use Scenario: Preventing catastrophic failure of constant-current LED drivers during hot-swap or capacitor discharge events. IC Role / Device Role / Timing Role: Primary surge clamp on high-side DC input, coordinated with upstream fuse and downstream LC filter. Use Value: 500W peak power rating handles 10/1000μs surges up to 3.4A without degradation; DO-15 footprint allows retrofit into existing designs. | Use Scenario: Front-end protection of 48V telecom or industrial SMPS inputs exposed to lightning-induced surges per IEC 61000-4-5. IC Role / Device Role / Timing Role: First-line unidirectional suppressor on rectified DC bus, before bulk capacitor and controller IC. Use Value: 175°C TJ max supports operation near heatsinks; UL 94V-0 compound enhances safety in enclosed power enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ85A | Same DO-214AC package; 85V VWM, 151V VC @ 3.4A, but bidirectional configuration unless specified as "A" suffix. | Requires verification of polarity alignment; not drop-in due to bidirectional default vs. SA85's unidirectional design. | Select SMAJ85A only if bidirectional protection is needed or if board layout accommodates polarity-aware placement. |
| ON Semiconductor 1.5KE85A | Higher PPK (1500W), larger DO-201AD package, 151V VC @ 9.9A - significantly higher surge capacity but incompatible footprint. | Suitable for higher-energy threats but requires PCB redesign; not suitable for space-constrained DO-15 layouts. | Choose 1.5KE85A only when surge energy exceeds 500W and mechanical redesign is acceptable. |
Compared with SMAJ85A and 1.5KE85A, the SA85 offers direct DO-204AC compatibility, AEC-Q101 qualification, and optimized clamping for 85V DC systems - making it ideal for automotive and industrial replacements where footprint and qualification are critical.
Availability
SA85 is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface protection, and LED driver overvoltage clamp applications requiring stable component supply and long-term lifecycle support.
Supply support for SA85 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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated semiconductor manufacturer specializing in discrete power devices, TVS diodes, and rectifiers for automotive, industrial, and consumer markets.
The SA Series was developed specifically for high-reliability transient suppression in harsh environments - emphasizing AEC-Q101 qualification, tight VBR tolerance, and robust thermal performance in axial-leaded packages.
FAQ
What is the breakdown voltage range of the SA85?
The SA85 has a minimum breakdown voltage (VBR) of 94.4 V and a maximum of 115 V, measured at 1 mA test current per ANSI/IEEE C62.35. This range ensures consistent turn-on behavior across temperature and manufacturing variation, and is confirmed in TSC's SA Series datasheet Version L2105, Table 4.
Is the SA85 unidirectional or bidirectional?
The SA85 is a unidirectional TVS diode, indicated by the absence of "CA" or "C" suffix and confirmed by its single cathode band marking per DO-204AC mechanical drawing. It protects against positive transients on the cathode side relative to anode (ground), unlike bidirectional variants such as SA85A.
Does the SA85 meet AEC-Q101 reliability standards?
Yes, the SA85 is AEC-Q101 qualified - explicitly stated in the FEATURES section of the official TSC SA Series datasheet (Version L2105). This qualification covers stress tests including HTGB, HTRB, TCT, and ESD, validating suitability for automotive electronic control units and body electronics.
What is the clamping voltage of the SA85 at its rated surge current?
The SA85 clamps to a maximum of 151 V at 3.4 A peak pulse current (IPPM), using the standard 10/1000 μs double-exponential waveform. This value is specified in the MAXIMUM RATINGS AND ELECTRICAL CHARACTERISTICS table (Version L2105, Page 4) and defines the upper voltage limit imposed on protected circuits during surge events.
Can the SA85 be used in place of the SA85A?
No - the SA85 and SA85A are not interchangeable. The SA85A is bidirectional (symmetrical VBR in both directions), while the SA85 is unidirectional. Substituting one for the other risks incorrect clamping behavior, potential device failure, or unprotected transients. Always match polarity and directionality per circuit requirements.
SA85 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-204AC, DO-15, Axial
- Series:
- SA
- 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:
- 151V
- Current - Peak Pulse (10/1000µs):
- 3.4A
- Power - Peak Pulse:
- 500W
- Power Line Protection:
- No
- Applications:
- General Purpose
- 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)
SA85 FAQ
1.How can I place an order for SA85 through Aetrix?
Please submit a Request for Quotation (RFQ) for SA85 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 SA85 reliable?
The price and inventory of SA85 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA85 is usually 5 days.
3.What payment methods are accepted for SA85?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA85 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA85?
SA85 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA85 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 SA85?
For technical support, including SA85 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA85 requirements.
6.How does Aetrix verify that SA85 is sourced from the original manufacturer or authorized distributors?
All SA85 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 SA85 meets industry standards.
7.What is the process for return or replacement of SA85?
All SA85 units undergo pre-shipment inspection (PSI). If there is an issue with SA85, 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 SA85 part is unused and in its original packaging.
Return procedure for SA85:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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