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Taiwan Semiconductor Corporation SA85CAH
- Part No.:
- SA85CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA85CAH.pdf
- Description:
- TVS DIODE 85VWM 137VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,182
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Product details
Overview
SA85CAH from Taiwan Semiconductor is a bidirectional AEC-Q101-qualified transient voltage suppressor (TVS) diode in DO-204AC (DO-15) package, designed for automotive and industrial surge protection. It features 85 V working stand-off voltage (VWM), 94.4–115 V breakdown voltage (VBR), 151 V maximum clamping voltage (VC) at 3.4 A peak pulse current, and 500 W peak pulse power rating per 10/1000 μs waveform.
For engineers reviewing the SA85CAH datasheet, SA85CAH pinout, SA85CAH application, or SA85CAH equivalent, key selection criteria include bidirectional ESD/EFM immunity performance, AEC-Q101 qualification status, clamping voltage margin relative to protected IC rails, and DO-15 thermal derating behavior under sustained ambient conditions.
Technical Context
The SA85CAH operates as a symmetrical avalanche diode with identical electrical characteristics in both directions, enabling robust protection of differential or AC-coupled signal lines without polarity concerns. Its 151 V clamping voltage at 3.4 A IPPM ensures safe voltage limiting during IEC 61000-4-5 surge events, while sub-1 μA reverse leakage at 85 V supports low-power system standby integrity.
Designed for unclamped transient energy absorption, it relies on junction avalanche breakdown rather than snapback or thyristor triggering. Thermal performance is defined by 175 °C maximum junction temperature and 3 W steady-state power dissipation on 10 × 10 mm copper pads - critical for under-hood automotive placement where ambient exceeds 105 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - Maximum continuous DC or RMS voltage the device blocks without conduction |
| VBR min/max | 94.4–115 V @ 1 mA - Confirmed breakdown threshold range ensuring reliable turn-on before system damage |
| VC @ IPPM | 151 V @ 3.4 A - Clamped voltage during 10/1000 μs surge, defining worst-case stress on downstream ICs |
| PPK | 500 W - Peak surge power handling capability per standard IEC 61000-4-5 waveform |
| TJ max | 175 °C - Maximum junction temperature enabling operation in high-ambient automotive environments |
| IR @ VWM | <1 μA - Negligible leakage current preserving battery life and signal integrity in always-on circuits |
| Package | DO-204AC (DO-15) - Industry-standard axial leaded package with UL 94V-0 molding and tin-plated leads |
Pinout & Package
SA85CAH is a two-terminal bidirectional TVS diode housed in a DO-204AC (DO-15) axial package. Polarity is non-applicable; terminals are interchangeable. The device has no cathode band marking, consistent with bidirectional construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Surge current path | Either terminal conducts equally during positive or negative transients - no orientation required during PCB placement |
| Leads (tin-plated) | PCB interface & thermal path | Solderable per J-STD-002; thermal resistance reduced via 10 × 10 mm copper pad mounting per datasheet condition |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive under-hood use including temperature cycling, mechanical shock, and humidity testing |
| Bidirectional symmetry | Identical VBR, VC, and IPPM in both directions - eliminates polarity-sensitive layout and enables AC line protection |
| Low clamping ratio (VC/VBR) | 151 V / 94.4 V ≈ 1.60 - tighter voltage control than typical 1.7–2.0 ratios, reducing overvoltage margin risk |
| Fast response time | <5 ns turn-on - ensures suppression initiates before transient energy couples into sensitive analog or digital circuitry |
| Halogen-free & RoHS | Complies with IEC 61249-2-21 and EU RoHS Directive - meets automotive OEM material compliance requirements |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting LIN bus transceivers and microcontroller I/O pins connected to 12 V battery-fed wiring harnesses subject to load dump and ISO 7637-2 pulses. IC Role / Device Role: Bidirectional voltage clamp placed across power rail and ground, shunting surge energy before reaching downstream logic. Use Value: Withstands 500 W surges and maintains <1 μA leakage at 85 V, enabling direct integration without compromising sleep-mode current budgets. | Use Scenario: Safeguarding 4–20 mA current loop receivers and RS-485 transceivers in factory automation PLC modules exposed to EFT bursts and inductive switching noise. IC Role / Device Role: Differential-line TVS across A/B bus lines or common-mode clamp between bus and chassis ground. Use Value: Symmetrical 94.4–115 V VBR ensures equal protection for positive/negative transients, eliminating need for dual unidirectional devices. |
| LED Driver Output Protection | Automotive Lighting Module ESD Guard |
Use Scenario: Shielding constant-current LED driver outputs from inductive kickback when driving solenoids or relays in shared vehicle subsystems. IC Role / Device Role: Parallel-connected TVS across driver output and return, clamping flyback spikes to prevent MOSFET gate oxide failure. Use Value: 151 V VC limits peak stress below typical 200 V MOSFET drain-source breakdown, extending reliability in cyclic load applications. | Use Scenario: Providing IEC 61000-4-2 Level 4 (15 kV air / 8 kV contact) ESD protection for headlamp control ICs and CAN/LIN nodes in exterior lighting assemblies. IC Role / Device Role: Localized TVS at connector entry points and IC supply pins to divert ESD current away from silicon. Use Value: AEC-Q101 qualification confirms robustness against automotive thermal and vibration stresses that degrade non-qualified TVS performance over time. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ85CA | DO-214AA (SMB) package; 10% lower clamping voltage (137 V); same 500 W rating and AEC-Q101 qualification | Surface-mount footprint reduces board space but requires reflow-compatible layout; lower thermal mass affects single-pulse vs. repetitive surge handling | Select SMBJ85CA when automated SMT assembly is preferred and thermal management uses PCB copper area instead of lead-frame conduction |
| P6SMB85CA | Same DO-214AA package as SMBJ85CA but rated for 600 W peak power; higher IPPM (3.7 A) and slightly higher VC (139 V) | Higher surge margin suits systems with frequent or high-energy transients; not AEC-Q101 qualified - limited to industrial use | Choose P6SMB85CA for non-automotive industrial equipment needing extra surge headroom without AEC-Q101 requirement |
Compared with SMBJ85CA and P6SMB85CA, SA85CAH offers through-hole DO-15 mounting for enhanced mechanical robustness and lead-frame heat sinking - advantageous in high-vibration automotive environments where solder joint fatigue is a concern, despite larger board footprint.
Availability
SA85CAH is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, LED driver outputs, and exterior lighting modules requiring stable component supply across extended production lifecycles.
Supply support for SA85CAH 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 AEC-Q101-compliant transient suppression in harsh automotive environments - emphasizing bidirectional symmetry, low clamping ratio, and high-temperature reliability up to 175 °C junction.
FAQ
What does the "H" suffix in SA85CAH signify?
The "H" suffix in SA85CAH indicates full AEC-Q101 qualification - verified through temperature cycling, mechanical shock, humidity testing, and high-temperature operating life per automotive reliability standards. This distinguishes SA85CAH from non-H variants like SA85CA, which lack formal automotive qualification documentation and are intended for industrial or commercial use only.
Is SA85CAH unidirectional or bidirectional, and how is polarity marked?
SA85CAH is a bidirectional TVS diode with symmetrical electrical characteristics in both directions. It has no cathode band or polarity marking - the device functions identically regardless of terminal orientation. This is confirmed by identical VBR, VC, and IPPM values for positive and negative surges in the official TSC datasheet.
What is the maximum clamping voltage of SA85CAH under standard test conditions?
The maximum clamping voltage of SA85CAH is 151 V, measured at 3.4 A peak pulse current (IPPM) using the 10/1000 μs double-exponential surge waveform. This value defines the upper voltage limit imposed on protected circuitry during worst-case transient events and is guaranteed across the full operating temperature range.
Can SA85CAH be used in place of a unidirectional TVS like SA85A?
No - SA85CAH cannot directly replace unidirectional SA85A because their conduction behavior differs fundamentally: SA85CAH conducts symmetrically in both directions, while SA85A only clamps negative transients (anode-to-cathode). Substitution would cause unintended forward conduction in DC-biased circuits and compromise protection integrity unless the application explicitly requires bidirectional clamping.
What packaging options are available for SA85CAH?
SA85CAH is supplied in DO-204AC (DO-15) package with two standard packing formats: 3,500 units per tape-and-reel (SA85CAH) and 1,500 units per ammo box (SA85CAHA0G). Both options feature pure tin-plated leads compliant with J-STD-002 and meet JESD 201 Class 2 whisker resistance requirements.
SA85CAH 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:
- 137V
- Current - Peak Pulse (10/1000µs):
- 3.8A
- 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)
SA85CAH FAQ
1.How can I place an order for SA85CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for SA85CAH 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 SA85CAH reliable?
The price and inventory of SA85CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA85CAH is usually 5 days.
3.What payment methods are accepted for SA85CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA85CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA85CAH?
SA85CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA85CAH 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 SA85CAH?
For technical support, including SA85CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA85CAH requirements.
6.How does Aetrix verify that SA85CAH is sourced from the original manufacturer or authorized distributors?
All SA85CAH 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 SA85CAH meets industry standards.
7.What is the process for return or replacement of SA85CAH?
All SA85CAH units undergo pre-shipment inspection (PSI). If there is an issue with SA85CAH, 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 SA85CAH part is unused and in its original packaging.
Return procedure for SA85CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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