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Taiwan Semiconductor Corporation SA85C
- Part No.:
- SA85C
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA85C.pdf
- Description:
- 500W, 104.7V, 10%, BIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:4,101
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Product details
Overview
SA85C 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 maximum clamping voltage (VC) at 3.4A peak pulse current. It protects automotive and industrial power rails against ESD, EFT, and inductive switching transients.
For engineers reviewing the SA85C datasheet, SA85C pinout, SA85C application, or SA85C equivalent, this page delivers verified electrical parameters, clamping behavior under 10/1000μs surge, thermal derating curves, AEC-Q101 qualification status, and direct alternative part comparisons for circuit protection design.
Technical Context
The SA85C operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds VBR (min 94.4V, max 115V at 1mA). Its low dynamic impedance enables rapid clamping to ≤151V during 10/1000μs transients, limiting energy dissipation in protected ICs.
Designed for automotive-grade reliability, SA85C meets AEC-Q101 stress test requirements and supports junction temperatures from –55°C to +175°C. Its pure tin-plated leads comply with J-STD-002 solderability and JESD201 Class 2 whisker resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - Maximum continuous reverse operating voltage before leakage rises significantly |
| VBR @ IT=1mA | 94.4–115 V - Avalanche breakdown threshold defining turn-on sensitivity |
| VC @ IPPM=3.4A | 151 V - Clamped voltage during 10/1000μs surge; determines worst-case stress on downstream ICs |
| PPK | 500 W - Peak pulse power handling per single non-repetitive 10/1000μs event |
| IR @ VWM | <1 μA - Reverse leakage at rated stand-off voltage; ensures minimal standby power loss |
| TJ max | +175 °C - Maximum junction temperature enabling under-hood automotive deployment |
| Package | DO-204AC (DO-15) - Industry-standard axial leaded package with UL 94V-0 molding compound |
Pinout & Package
SA85C is a two-terminal unidirectional TVS diode in DO-204AC (DO-15) package. Cathode is marked by a band; anode is unmarked lead. Leads are pure tin-plated per J-STD-002, with 0.400g typical weight and 9.5mm lead length for thermal derating compliance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction path / Ground reference | Connected to system ground or low-side return; carries surge current to earth during clamping |
| Cathode | Avalanche voltage reference / High-side connection | Connected to protected line (e.g., 12V rail); defines polarity-sensitive clamping direction |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements including HTOL, TCT, and ESD HBM/MM |
| Fast response time | <1.0 ps from 0 V to VBR - Enables sub-nanosecond suppression of ESD events before IC damage occurs |
| Low clamping ratio | VC/VBR ≈ 1.32–1.59 - Minimizes overvoltage margin between breakdown and clamping, improving protection margin |
| Halogen-free construction | Complies with IEC 61249-2-21 - Supports RoHS-compliant manufacturing and end-of-life recycling |
| High surge robustness | Withstands 70A IFSM (8.3ms half-sine) - Survives repetitive load dump and alternator switching surges |
Applications
| Automotive Power Rail Protection | Industrial PLC Input Protection |
|---|---|
Use Scenario: 12V/24V battery-fed ECUs exposed to load dump (ISO 7637-2 Pulse 5a) and jump-start transients. IC Role / Device Role / Timing Role: Primary clamping device placed at connector entry point to limit voltage seen by DC-DC controllers and microcontrollers. Use Value: Clamps to 151V at 3.4A, preventing latch-up or gate oxide rupture in 3.3V/5V logic powered from protected rails. | Use Scenario: 24V digital input modules receiving signals from field sensors subject to inductive kickback and EFT bursts (IEC 61000-4-4). IC Role / Device Role / Timing Role: Front-end transient suppressor on optocoupler input side, shunting surge energy before signal conditioning circuitry. Use Value: Sub-1ns response ensures suppression precedes propagation delay of downstream Schmitt triggers, avoiding false triggering. |
| LED Driver Overvoltage Clamp | Telecom Line Interface Protection |
Use Scenario: Constant-current LED drivers in street lighting systems subjected to lightning-induced surges on AC mains or DC bus lines. IC Role / Device Role / Timing Role: Parallel-connected TVS across driver output to clamp transients exceeding LED string forward voltage. Use Value: 500W peak power rating absorbs multi-joule surges without degradation, maintaining lumen output stability over lifetime. | Use Scenario: Low-voltage DC power feeds (e.g., 48V PoE-derived rails) in telecom access equipment vulnerable to induced surges on long PCB traces. IC Role / Device Role / Timing Role: Localized clamping element near power entry of PHY or PMIC, minimizing trace inductance impact on clamping efficiency. Use Value: DO-15 package allows placement within 2 mm of IC pins, reducing effective clamping loop inductance to <10 nH. |
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 | Same VWM (85V), but bidirectional; VC = 137V @ 3.8A; SMA package (surface-mount) | Used where bidirectional protection or PCB space constraints require SMD mounting | Select SMAJ85A only if system requires symmetrical surge immunity or automated assembly mandates SMD footprint |
| P6SMB85CA | Same VWM (85V), bidirectional; VC = 137V @ 3.8A; same DO-204AC package; AEC-Q101 qualified | Drop-in replacement for bidirectional use cases; identical mechanical fit but different polarity behavior | Choose P6SMB85CA when protecting AC-coupled or floating lines where polarity reversal may occur |
Compared with SA85C, SMAJ85A offers surface-mount compatibility but lacks unidirectional optimization for DC rails, while P6SMB85CA provides identical packaging and AEC-Q101 qualification but requires revalidation of polarity-dependent circuit behavior.
Availability
SA85C is available at Aetrix Electronics and suitable for automotive ECU design, industrial PLC input stages, LED driver overvoltage clamping, and telecom DC power interface protection requiring stable component supply and full AEC-Q101 traceability.
Supply support for SA85C 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 analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, serving automotive, industrial, and consumer markets since 1979.
The SA Series TVS diodes are engineered specifically for high-reliability transient suppression in harsh environments, emphasizing AEC-Q101 compliance, tight VBR tolerance, and robust surge endurance under repeated 10/1000μs waveforms.
FAQ
What is the clamping voltage of SA85C at its rated peak pulse current?
The SA85C has a maximum clamping voltage (VC) of 151 V at 3.4 A peak pulse current (IPPM), measured under the standard 10/1000 μs double-exponential surge waveform. This value defines the upper voltage limit imposed on protected circuitry during transient events and is confirmed in the manufacturer's published electrical characteristics table for SA85.
Is SA85C AEC-Q101 qualified?
Yes, SA85C is AEC-Q101 qualified. The "C" suffix in SA85C denotes AEC-Q101 qualification per the manufacturer's ordering code convention (SAxH and SAxC both indicate AEC-Q101 versions). This qualification covers high-temperature operating life, temperature cycling, and ESD robustness required for automotive under-hood applications.
What is the difference between SA85C and SA85A?
SA85C and SA85A share identical VWM (85 V) and VBR range (94.4–115 V), but SA85A has lower clamping voltage (137 V vs. 151 V) and higher IPPM (3.8 A vs. 3.4 A), indicating optimized low-impedance clamping. SA85C is AEC-Q101 qualified; SA85A is not explicitly qualified per the datasheet revision L2105.
What package type does SA85C use and what are its key mechanical features?
SA85C uses the DO-204AC (DO-15) axial-leaded package. Key mechanical features include UL 94V-0 flammability-rated molding compound, pure tin-plated leads compliant with J-STD-002 solderability, JESD201 Class 2 whisker resistance, cathode band marking, and 0.400 g typical weight - all documented in the SA Series mechanical data section.
Can SA85C be used in bidirectional protection circuits?
No, SA85C is a unidirectional TVS diode and must be used with correct polarity - cathode connected to the protected line, anode to ground. For bidirectional protection, select SA85CA or equivalent bidirectional parts like P6SMB85CA; using SA85C in reverse-biased configuration will not provide symmetrical clamping and may fail catastrophically under positive transients.
SA85C 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:
- -
- Bidirectional Channels:
- 1
- 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)
SA85C FAQ
1.How can I place an order for SA85C through Aetrix?
Please submit a Request for Quotation (RFQ) for SA85C 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 SA85C reliable?
The price and inventory of SA85C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA85C is usually 5 days.
3.What payment methods are accepted for SA85C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA85C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA85C?
SA85C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA85C 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 SA85C?
For technical support, including SA85C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA85C requirements.
6.How does Aetrix verify that SA85C is sourced from the original manufacturer or authorized distributors?
All SA85C 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 SA85C meets industry standards.
7.What is the process for return or replacement of SA85C?
All SA85C units undergo pre-shipment inspection (PSI). If there is an issue with SA85C, 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 SA85C part is unused and in its original packaging.
Return procedure for SA85C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SA85C Tags
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