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Taiwan Semiconductor Corporation SA85H
- Part No.:
- SA85H
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA85H.pdf
- Description:
- 500W, 104.7V, 10%, UNIDIRECTIONA
- Quantity:
- Payment:
- Shipping:
Inventory:9,989
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Product details
Overview
SA85H from Taiwan Semiconductor is a unidirectional 500W transient voltage suppressor (TVS) diode with 85V working stand-off voltage, 94.4–115V breakdown voltage at 1mA test current, and 151V maximum clamping voltage at 3.4A peak pulse current-designed for automotive-grade ESD and inductive load surge protection in power supply rails and signal lines.
For engineers reviewing the SA85H datasheet, SA85H pinout, SA85H application, or SA85H equivalent, this AEC-Q101 qualified DO-15 packaged TVS delivers verified clamping performance under 10/1000μs surges, low leakage (<1μA @ 85V), and junction temperature operation up to +175°C-critical for under-hood automotive modules, LED drivers, and industrial PLC I/O protection.
Technical Context
The SA85H operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its VBR range (94.4–115V). It clamps transients to ≤151V at 3.4A (10/1000μs), with <1.0ps response time from 0V to VBR, enabling protection of downstream MOSFETs and controllers against fast-rising EFT and load dump events.
Its thermal design supports continuous operation at TJ = –55°C to +175°C, with steady-state power dissipation of 3W at TL = 75°C on 10×10 mm copper pads. The device meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements for high-reliability PCB mounting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - Maximum continuous reverse operating voltage before clamping begins; sets safe margin above 72V automotive nominal rail. |
| VBR @ IT=1mA | 94.4–115 V - Breakdown voltage tolerance defines minimum trigger threshold and ensures reliable activation during overvoltage events. |
| VC @ IPPM=3.4A | 151 V - Clamping voltage limits stress on protected ICs; enables survival of ISO 7637-2 Pulse 5a (load dump) up to 120V. |
| PPK | 500 W - Peak pulse power rating at 10/1000μs waveform; validates robustness against repetitive surge stress in harsh environments. |
| IR @ VWM | <1 μA - Reverse leakage ensures minimal standby power loss and avoids false triggering in high-impedance sensing circuits. |
| TJ max | +175 °C - Maximum junction temperature supports placement near heat sources (e.g., engine control units) without derating. |
| Package | DO-204AC (DO-15) - Industry-standard axial lead package with tin-plated leads compliant to J-STD-002 solderability. |
Pinout & Package
DO-204AC (DO-15) package with axial leads: cathode indicated by band marking; anode and cathode terminals defined per polarity marking. Leads are pure tin plated, solderable per J-STD-002, and meet JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to system ground or low-side return path; carries surge current during clamping. |
| Cathode | Reverse-biased input terminal | Connected to protected line (e.g., 12V rail); voltage referenced to anode during transient suppression. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including engine control, body electronics, and ADAS sensor interfaces. |
| Fast response time | <1.0 ps from 0V to VBR ensures suppression initiates before sensitive logic or analog circuitry sustains damage. |
| Low clamping ratio (VC/VBR) | 151V / 94.4V ≈ 1.60 - Tight ratio minimizes overvoltage overshoot during surge events. |
| Halogen-free construction | Complies with IEC 61249-2-21 - supports RoHS-compliant manufacturing and end-of-life recycling requirements. |
| UL 94V-0 molding compound | Self-extinguishing encapsulation prevents flame propagation in high-energy fault conditions. |
Applications
| Automotive Load Dump Protection | Industrial PLC Digital Input Protection |
|---|---|
Use Scenario: Protecting microcontroller I/O and power management ICs in engine control units during ISO 7637-2 Pulse 5a (load dump) events up to 120V. IC Role / Device Role: Unidirectional TVS placed between battery rail and DC-DC input stage to clamp transient energy before it reaches LDOs or buck converters. Use Value: Limits peak voltage to 151V while absorbing 500W pulses, preventing latch-up or gate oxide rupture in protected silicon. | Use Scenario: Safeguarding 24V digital input channels in programmable logic controllers exposed to inductive kickback from solenoid valves and contactors. IC Role / Device Role: Front-end transient suppressor on isolated input optocoupler supply rail, shunting surge current to ground. Use Value: Withstands repeated 10/1000μs surges up to 3.4A without degradation, extending field lifetime beyond 10 years in factory automation. |
| LED Driver Overvoltage Clamp | ESD Protection for Automotive Infotainment |
Use Scenario: Preventing catastrophic failure of constant-current LED driver ICs in headlamp modules subjected to alternator ripple and jump-start transients. IC Role / Device Role: Parallel-connected TVS across driver output to clamp voltage spikes exceeding 85V working stand-off level. Use Value: Clamps within 1.0ps to 151V, ensuring LED string remains functional and driver FETs avoid avalanche-induced thermal runaway. | Use Scenario: Shielding USB, CAN, and display interface lines in infotainment head units from human-body-model (HBM) ESD events per ISO 10605. IC Role / Device Role: Secondary-level TVS on power rails feeding interface transceivers, complementing primary ESD diodes. Use Value: Sub-1μA leakage preserves sleep-mode current budget; AEC-Q101 qualification guarantees reliability across temperature cycling and vibration profiles. |
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; higher IR (5μA vs. <1μA); SMA package (surface-mount). | Requires PCB redesign for SMT layout; suitable where bidirectional protection or board space constraints dominate. | Select SMAJ85A only if bidirectional clamping is required or DO-15 through-hole mounting is unavailable. |
| P6KE85A | Same VWM (85V), unidirectional, DO-15; lower PPK (600W vs. 500W); higher VC (145V vs. 151V); no AEC-Q101 qualification. | Lacks automotive qualification; acceptable for industrial non-safety-critical use where cost is prioritized over qualification. | Choose P6KE85A for cost-sensitive non-automotive applications where AEC-Q101 is not mandated. |
Compared with SMAJ85A and P6KE85A, the SA85H uniquely combines AEC-Q101 qualification, ultra-low leakage (<1μA), and DO-15 through-hole compatibility-making it the preferred choice for automotive power rail protection where reliability, thermal stability, and legacy board compatibility are essential.
Availability
SA85H is available at Aetrix Electronics and suitable for automotive electronic control units, industrial programmable logic controllers, LED lighting systems, and embedded power supply designs requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SA85H 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 for automotive, industrial, and consumer markets.
The SA Series was developed specifically for high-reliability transient suppression in automotive power systems, emphasizing AEC-Q101 compliance, tight parameter tolerances, and robust thermal performance under sustained high-temperature operation.
FAQ
What is the breakdown voltage range of the SA85H?
The SA85H has a specified breakdown voltage (VBR) range of 94.4 V to 115 V at 1 mA test current, measured per ANSI/IEEE C62.35 standards. This range ensures consistent triggering behavior across production lots and temperature extremes, supporting reliable overvoltage protection in 85V-rated systems such as 72V commercial vehicle power networks.
Is the SA85H unidirectional or bidirectional?
The SA85H is a unidirectional transient voltage suppressor, indicated by the absence of "CA" or "C" suffix and confirmed by its single cathode band marking and specification of forward voltage (VF = 3.5 V at 35 A). It conducts only in forward bias and clamps reverse transients-making it ideal for DC rail protection where polarity is fixed.
Does the SA85H meet AEC-Q101 qualification?
Yes, the SA85H is explicitly AEC-Q101 qualified, as confirmed in the SA Series documentation (Version L2105) and ordering code suffix "H". This qualification covers stress tests including high-temperature operating life, temperature cycling, and ESD-validating its suitability for automotive powertrain, chassis, and body electronics applications.
What is the maximum clamping voltage of the SA85H at rated surge current?
The SA85H exhibits a maximum clamping voltage (VC) of 151 V at 3.4 A peak pulse current (10/1000μs waveform), per the manufacturer's electrical characteristics table. This value defines the upper voltage limit imposed on protected circuitry during worst-case surge events and is critical for ensuring downstream ICs remain within absolute maximum ratings.
What package type does the SA85H use and what are its mechanical features?
The SA85H uses the DO-204AC (DO-15) axial-leaded package with pure tin-plated leads compliant to J-STD-002 solderability, UL 94V-0 flammability-rated epoxy molding, and polarity marked by a cathode band. Its weight is approximately 0.400 g, and it meets JESD201 Class 2 whisker resistance for long-term reliability in vibration-prone environments.
SA85H 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:
- -
- 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)
SA85H FAQ
1.How can I place an order for SA85H through Aetrix?
Please submit a Request for Quotation (RFQ) for SA85H 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 SA85H reliable?
The price and inventory of SA85H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA85H is usually 5 days.
3.What payment methods are accepted for SA85H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA85H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA85H?
SA85H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA85H 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 SA85H?
For technical support, including SA85H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA85H requirements.
6.How does Aetrix verify that SA85H is sourced from the original manufacturer or authorized distributors?
All SA85H 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 SA85H meets industry standards.
7.What is the process for return or replacement of SA85H?
All SA85H units undergo pre-shipment inspection (PSI). If there is an issue with SA85H, 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 SA85H part is unused and in its original packaging.
Return procedure for SA85H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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