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Taiwan Semiconductor Corporation SA85CH
- Part No.:
- SA85CH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA85CH.pdf
- Description:
- 500W, 104.7V, 10%, BIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:3,963
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Product details
Overview
SA85CH 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 - designed for automotive-grade ESD and load-dump protection in power supply rails and signal lines.
For engineers reviewing the SA85CH datasheet, SA85CH pinout, SA85CH application, or SA85CH equivalent, this AEC-Q101 qualified TVS offers verified clamping performance under 10/1000μs surge, sub-1ps response time, <1μA reverse leakage above 10V, and UL 94V-0 molded case - critical for robust front-end protection in automotive lighting, infotainment, and body control modules.
Technical Context
The SA85CH operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its VBR range (94.4–115V), clamping transients to ≤151V at 3.4A. Its low dynamic impedance ensures effective energy diversion during fast EFT or ISO 7637-2 pulses.
Designed per ANSI/IEEE C62.35, it sustains 500W non-repetitive peak pulse power (10/1000μs), derates linearly above 25°C ambient, and maintains stable operation from −55°C to +175°C junction temperature - validated for automotive under-hood environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - Maximum continuous reverse operating voltage before conduction begins; sets safe margin below system rail (e.g., 12V/24V/48V bus). |
| VBR @ 1mA | 94.4–115 V - Breakdown threshold range; ensures reliable triggering without premature conduction during normal operation. |
| VC @ IPPM | 151 V at 3.4 A - Clamped voltage during 10/1000μs surge; defines worst-case stress on downstream ICs. |
| PPK | 500 W - Peak pulse power handling; supports high-energy transients like ISO 16750-2 load dump (up to 120V/100ms). |
| IR @ VWM | <1 μA - Reverse leakage at 85V; negligible power loss and thermal impact in standby mode. |
| TJ MAX | +175 °C - Maximum junction temperature; enables placement near heat sources (e.g., power MOSFETs, DC-DC converters). |
| Response Time | <1.0 ps - Time from 0V to VBR onset; faster than most microsecond-scale protection devices, critical for ESD immunity. |
Pinout & Package
DO-204AC (DO-15) axial-leaded package with cathode band marking; leads are pure tin plated, solderable per J-STD-002, and pass JESD 201 Class 2 whisker test. Weight: ~0.400 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current path / Ground reference | Connected to system ground or low-side return; conducts surge current to GND during clamping. |
| Cathode | Reverse-biased input / Protected line connection | Connected to protected line (e.g., battery rail); blocks VWM but avalanches at VBR to shunt overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive use including temperature cycling, humidity, and mechanical shock per JESD47. |
| UL 94V-0 molding compound | Self-extinguishing encapsulation prevents flame propagation in enclosed automotive housings. |
| Low clamping ratio (VC/VBR ≈ 1.5) | Minimizes overvoltage overshoot during surge events, reducing stress on downstream 100V-rated FETs or regulators. |
| 10/1000μs waveform compliance | Meets IEC 61000-4-5 Level 4 surge immunity requirements for industrial and automotive applications. |
| Halogen-free construction | Complies with IEC 61249-2-21; supports RoHS and ELV directive compliance in vehicle manufacturing. |
Applications
| Automotive Lighting Systems | Body Control Modules (BCM) |
|---|---|
Use Scenario: Protecting LED driver ICs and CAN transceivers from load-dump spikes (up to 120V) during alternator regulation failure. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 12V/24V supply rail upstream of DC-DC converters and LDOs. Use Value: Limits rail voltage to ≤151V during 500W surges, preventing latch-up or gate oxide rupture in sensitive drivers. | Use Scenario: Safeguarding microcontroller I/O pins and LIN transceivers against ESD (±15kV contact) and electrical fast transients (EFT) in door modules. IC Role / Device Role / Timing Role: Localized TVS at connector entry points and PCB-level signal conditioning nodes. Use Value: Sub-1ps response ensures clamping before ESD pulse propagates into silicon, preserving signal integrity and MCU reliability. |
| Infotainment Power Rails | Engine Control Unit (ECU) Sensors |
Use Scenario: Suppressing switching noise and coupled transients from adjacent DC-DC converters powering display controllers and audio amplifiers. IC Role / Device Role / Timing Role: Secondary protection stage after bulk capacitance, filtering residual high-frequency surge energy. Use Value: Low leakage (<1μA) avoids DC bias shift on analog sensor references; stable VBR ensures consistent trip point across temperature. | Use Scenario: Shielding crankshaft/camshaft position sensors from inductive kickback generated by solenoid drivers and fuel injectors. IC Role / Device Role / Timing Role: Bidirectional-capable variant not used; SA85CH's unidirectional configuration isolates sensor ground from noisy chassis return paths. Use Value: 175°C max junction rating allows direct mounting on ECU PCBs near high-temp engine interface circuitry without derating. |
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), lower PPK (400W), SMA package (surface-mount), no AEC-Q101 certification | Not qualified for automotive under-hood use; suitable for commercial-grade consumer electronics | Select SMAJ85A only if board space constraints require SMD and AEC-Q101 is not mandated. |
| P6SMB85CA | Bidirectional configuration (VBR symmetric), same VWM and PPK, DO-214AA package, AEC-Q101 available in CA variant | Clamps both polarities - required for AC-coupled or floating signal lines; unsuitable for DC rail where polarity must be preserved | Choose P6SMB85CA only when bidirectional protection is needed; SA85CH preserves polarity-sensitive grounding schemes. |
Compared with SMAJ85A and P6SMB85CA, SA85CH uniquely combines AEC-Q101 qualification, unidirectional clamping, 500W surge rating, and axial DO-15 through-hole mounting - making it optimal for legacy automotive designs requiring proven mechanical robustness and high-temperature reliability.
Availability
SA85CH is available at Aetrix Electronics and suitable for automotive lighting systems, body control modules, infotainment power rails, and engine control unit sensor interfaces requiring stable component supply and long-term lifecycle support.
Supply support for SA85CH 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, rectifiers, and MOSFETs - headquartered in Hsinchu, Taiwan, with global distribution and AEC-Q101 validation capabilities.
The SA Series is engineered specifically for automotive-grade transient suppression, emphasizing high surge robustness, tight parameter tolerances, and extended temperature operation - targeting replacement of legacy 1.5KE and P4SMA families in next-gen vehicle ECUs and ADAS subsystems.
FAQ
What is the clamping voltage of SA85CH at its rated peak pulse current?
The SA85CH has a maximum clamping voltage (VC) of 151 V at 3.4 A peak pulse current (IPPM), measured under the standard 10/1000μs waveform. This value defines the upper voltage limit imposed on protected circuits during surge events and is critical for ensuring downstream components remain within their absolute maximum ratings. The SA85CH achieves this clamping performance while maintaining low dynamic impedance and sub-1ps response time.
Is SA85CH suitable for bidirectional transient protection?
No, SA85CH is a unidirectional TVS diode - it clamps only in reverse bias and conducts forward current like a standard rectifier. For bidirectional protection, TSC offers the SA85A variant (with "A" suffix), which provides symmetrical clamping in both directions. Using SA85CH in a bidirectional application risks failure during positive transients, as it lacks reverse-blocking capability on the anode side. Always verify polarity alignment in schematic design.
Does SA85CH meet automotive qualification standards?
Yes, SA85CH is explicitly AEC-Q101 qualified, as indicated by the "H" suffix in its ordering code. It has undergone stress testing including temperature cycling, high-temperature operating life, and mechanical shock per JESD47, confirming suitability for automotive under-hood and cabin applications. This qualification is documented in TSC's SA Series datasheet Version L2105 and supported by certified test reports available upon request.
What is the maximum operating temperature for SA85CH?
The SA85CH has a maximum junction temperature (TJ MAX) of +175°C and an operating junction temperature range of −55°C to +175°C. This wide range enables deployment in high-heat environments such as near engine compartments or power inverters. Derating curves in the datasheet specify reduced peak pulse power above 25°C ambient, and thermal design must account for lead-to-board copper area per JEDEC standards to maintain safe TJ under sustained surge conditions.
How does SA85CH differ from SA85A?
SA85CH is unidirectional with AEC-Q101 qualification ("H" suffix), while SA85A is bidirectional and not AEC-Q101 rated unless specified separately. SA85CH has tighter VBR tolerance (94.4–115V vs. SA85A's 94.4–104V), higher clamping voltage (151V vs. 137V), and is optimized for DC rail protection with polarity-aware grounding. SA85A suits AC or floating signal lines where polarity reversal may occur. Both share DO-204AC packaging and 500W rating, but functional behavior differs fundamentally.
SA85CH 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:
- -
- 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)
SA85CH FAQ
1.How can I place an order for SA85CH through Aetrix?
Please submit a Request for Quotation (RFQ) for SA85CH 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 SA85CH reliable?
The price and inventory of SA85CH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA85CH is usually 5 days.
3.What payment methods are accepted for SA85CH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA85CH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA85CH?
SA85CH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA85CH 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 SA85CH?
For technical support, including SA85CH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA85CH requirements.
6.How does Aetrix verify that SA85CH is sourced from the original manufacturer or authorized distributors?
All SA85CH 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 SA85CH meets industry standards.
7.What is the process for return or replacement of SA85CH?
All SA85CH units undergo pre-shipment inspection (PSI). If there is an issue with SA85CH, 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 SA85CH part is unused and in its original packaging.
Return procedure for SA85CH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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