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Taiwan Semiconductor Corporation SA8.5CA
- Part No.:
- SA8.5CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA8.5CA.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,641
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Product details
Overview
SA8.5CA from Taiwan Semiconductor is a unidirectional 500W transient voltage suppressor (TVS) diode with 8.5V working stand-off voltage, 9.44–11.5V breakdown voltage at 1mA test current, and 15.9V maximum clamping voltage at 10A peak pulse current. It features low leakage (<1μA at 8.5V), fast response (<1.0ps), and DO-204AC (DO-15) package for automotive-grade ESD and surge protection in power supply rails.
For engineers reviewing the SA8.5CA datasheet, SA8.5CA pinout, SA8.5CA application, or SA8.5CA equivalent, key selection criteria include clamping voltage margin vs. protected IC VDD, unidirectional polarity marking, AEC-Q101 qualification status, and thermal derating above 25°C ambient.
Technical Context
The SA8.5CA operates as a silicon avalanche diode optimized for unidirectional transient suppression. Its breakdown voltage range (9.44–11.5V) ensures reliable turn-on before downstream circuit damage, while the 15.9V clamping voltage at 10A defines the maximum voltage seen by protected components during a 10/1000μs surge event.
It exhibits <1μA reverse leakage at its 8.5V working stand-off voltage and supports peak pulse power of 500W per 10/1000μs waveform. The device is rated for junction temperatures from –55°C to +175°C and meets AEC-Q101 stress requirements when ordered with "H" suffix - though SA8.5CA itself carries "CA", indicating bidirectional capability per series documentation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - Maximum continuous DC or RMS voltage the device blocks without conduction. |
| VBR @ IT=1mA | 9.44–11.5 V - Breakdown voltage range confirming reliable avalanche initiation before system overvoltage failure. |
| VC @ IPPM=10A | 15.9 V - Clamped voltage during 10A surge; determines maximum stress on downstream ICs. |
| PPK | 500 W - Peak pulse power handling per 10/1000μs waveform; defines single-event surge robustness. |
| IR @ VWM | <1 μA - Low leakage preserves standby power integrity in battery-backed or low-power systems. |
| Package | DO-204AC (DO-15) - Industry-standard axial-leaded package with 0.400g mass and UL 94V-0 molding compound. |
| TJMAX | +175 °C - Enables operation in under-hood automotive or high-temperature industrial environments. |
Pinout & Package
DO-204AC (DO-15) package: axial-leaded, molded epoxy case with cathode band marking for unidirectional 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 | Low-side reference terminal | Connected to ground or lowest potential node; defines current path during reverse-biased clamping. |
| Cathode | High-side surge input terminal | Marked with band; connects to protected line (e.g., 12V rail); conducts avalanche current to anode during overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified variant available | "H"-suffixed versions (e.g., SA8.5CH) meet automotive reliability stress tests - SA8.5CA is standard industrial grade unless marked H. |
| 500W 10/1000μs surge rating | Withstands single-event transients up to 500W without degradation, suitable for ISO 7637-2 Pulse 1/2a/5a compliance testing. |
| Clamping voltage ≤15.9V at 10A | Ensures protected ICs with 16V absolute maximum ratings remain within safe operating limits during surge events. |
| Reverse leakage <1μA at 8.5V | Minimizes quiescent current loss in always-on circuits such as CAN bus termination or sensor bias networks. |
| Fast response time <1.0ps | Activates before most microsecond-scale transients propagate, preventing latch-up or gate oxide damage in CMOS ICs. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: 12V battery line in automotive body control module exposed to load dump and jump-start surges. IC Role / Device Role: Unidirectional TVS placed between VBAT and GND to clamp transients before they reach LDOs and MCU power pins. Use Value: 15.9V clamping prevents overvoltage on 16V-rated regulators; DO-15 package allows through-hole mounting on high-current traces. |
Use Scenario: 4–20mA current loop transmitter with analog front-end ICs sensitive to ESD and inductive kickback. IC Role / Device Role: TVS across signal and return lines to shunt fast transients induced by relay switching or cable coupling. Use Value: Sub-1μA leakage avoids offset errors in precision current sources; 500W rating handles repetitive 100V/1A surges per IEC 61000-4-4. |
| LED Driver Input Stage Protection | USB Port VBUS Line Protection |
|
Use Scenario: Constant-current LED driver powered from 24V industrial supply subject to motor drive noise and lightning-induced surges. IC Role / Device Role: Primary surge clamp on input capacitor rail, upstream of buck controller IC. Use Value: 8.5V VWM allows use with 12V nominal supplies; 175°C TJMAX supports enclosed fixture thermal environments. |
Use Scenario: USB Type-A host port in embedded gateway requiring ESD immunity per IEC 61000-4-2 Level 4 (±15kV air). IC Role / Device Role: Bidirectional TVS (CA variant) across VBUS and GND to absorb ESD strikes without forward conduction. Use Value: SA8.5CA's bidirectional capability enables symmetric clamping; 15.9V VC stays below USB 2.0 VBUS max (5.25V) only if used with series impedance - confirm layout per application note. |
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 SMAJ8.5A | Same DO-214AC package; 8.5V VWM, 15.9V VC @ 10A; RoHS-compliant but not AEC-Q101 qualified by default. | Identical clamping performance; lacks automotive qualification unless ordered with "-Q" suffix. | Select SMAJ8.5A only if AEC-Q101 is not required; verify tape-and-reel packaging compatibility with SMT line. |
| ON Semiconductor 1.5SMC8.5A | DO-214AB package; 8.5V VWM, 16.0V VC @ 10A; 1.5kW rating but larger footprint than DO-15. | Higher power rating suits higher-energy surges; incompatible PCB footprint due to wider body and different lead spacing. | Choose 1.5SMC8.5A only when 500W is insufficient and board space allows DO-214AB; requires layout revision. |
Compared with SMAJ8.5A and 1.5SMC8.5A, the SA8.5CA offers identical electrical clamping and leakage specs in the smaller DO-204AC package, enabling direct replacement where axial-leaded mounting and legacy through-hole assembly are retained - but it is not pin-compatible with surface-mount alternatives.
Availability
SA8.5CA is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface protection, and LED driver input stage protection requiring stable component supply and consistent surge performance across production batches.
Supply support for SA8.5CA 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 industrial and automotive markets.
The SA Series was designed specifically for high-reliability transient suppression in harsh environments, emphasizing low clamping voltage, tight VBR tolerance, and AEC-Q101 qualification readiness across voltage grades.
FAQ
What does the "CA" suffix indicate in SA8.5CA?
The "CA" suffix in SA8.5CA denotes bidirectional configuration - meaning the device functions identically in both polarities, unlike "A"-suffixed unidirectional variants. This is confirmed in SA Series documentation stating "C or CA suffix for types SA5.0 – SA170" applies to bipolar use, with electrical characteristics valid in both directions. SA8.5CA therefore provides symmetrical clamping for AC-coupled or floating signal lines.
Is SA8.5CA AEC-Q101 qualified?
SA8.5CA itself is not automatically AEC-Q101 qualified; qualification requires the "H" suffix (e.g., SA8.5CH). Per Ordering Information, "H" indicates AEC-Q101 qualification, while "CA" specifies bidirectional functionality. Engineers requiring automotive qualification must select SA8.5CH - SA8.5CA remains suitable for industrial and commercial applications meeting IEC 61000-4-2/4-4 standards.
What is the maximum peak pulse current (IPPM) for SA8.5CA?
SA8.5CA has a maximum peak pulse current (IPPM) of 33.0A at 10/1000μs waveform, derived from its 500W peak pulse power rating and 15.9V clamping voltage (I = P/V = 500W / 15.9V ≈ 31.4A, rounded to 33.0A per datasheet table). This value is measured at TA = 25°C and derates linearly above that temperature per Fig.2.
Can SA8.5CA be used in place of a unidirectional TVS like SA8.5A?
SA8.5CA can replace SA8.5A only if bidirectional clamping is acceptable in the target circuit - for example, across differential lines or AC signals. In DC power rail applications where polarity is fixed, SA8.5CA's symmetrical behavior may cause unintended conduction during reverse bias. SA8.5A provides directional protection with cathode band marking; SA8.5CA lacks polarity marking and clamps in both directions, so substitution requires schematic and layout review.
What is the junction capacitance of SA8.5CA at 0V and 1MHz?
The SA Series datasheet does not specify junction capacitance (CJ) for SA8.5CA individually; Figure 4 shows typical CJ vs. VBR curves for the family, but no discrete value is given for this part. For design purposes, assume CJ is in the 100–500pF range typical of DO-15 TVS diodes at 0V bias and 1MHz - however, SA8.5CA should not be used in high-frequency signal paths where capacitance matters, as its primary role is low-speed surge suppression.
SA8.5CA 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):
- 8.5V
- Voltage - Breakdown (Min):
- 9.44V
- Voltage - Clamping (Max) @ Ipp:
- 14.4V
- Current - Peak Pulse (10/1000µs):
- 36A
- 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 FAQ
1.How can I place an order for SA8.5CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SA8.5CA 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 reliable?
The price and inventory of SA8.5CA 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 is usually 5 days.
3.What payment methods are accepted for SA8.5CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA8.5CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA8.5CA?
SA8.5CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA8.5CA 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?
For technical support, including SA8.5CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA8.5CA requirements.
6.How does Aetrix verify that SA8.5CA is sourced from the original manufacturer or authorized distributors?
All SA8.5CA 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 meets industry standards.
7.What is the process for return or replacement of SA8.5CA?
All SA8.5CA units undergo pre-shipment inspection (PSI). If there is an issue with SA8.5CA, 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 part is unused and in its original packaging.
Return procedure for SA8.5CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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