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Taiwan Semiconductor Corporation SA85AH
- Part No.:
- SA85AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA85AH.pdf
- Description:
- TVS DIODE 85VWM 137VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,882
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Product details
Overview
SA85AH from Taiwan Semiconductor is a unidirectional AEC-Q101-qualified transient voltage suppressor (TVS) diode in DO-204AC (DO-15) package, designed for automotive and industrial overvoltage protection. It features 85 V working stand-off voltage (VWM), 94.4–115 V breakdown voltage (VBR @ 1 mA), 151 V maximum clamping voltage (VC) at 3.4 A peak pulse current, and 500 W surge capability per 10/1000 μs waveform.
For engineers reviewing the SA85AH datasheet, SA85AH pinout, SA85AH application, or SA85AH equivalent, this device is selected for robust ESD and electrical fast transient (EFT) immunity in 12 V/24 V automotive power rails, DC-DC converter input stages, and CAN/LIN bus interface protection where low leakage (<1 μA @ 85 V), fast response (<1.0 ps), and high junction temperature rating (175 °C) are critical.
Technical Context
The SA85AH operates as a unidirectional avalanche diode with silicon planar junction construction, optimized for clamping transients above its VWM while maintaining sub-μA reverse leakage at rated stand-off. Its thermal design supports continuous operation up to TJ = 175 °C, and its surge rating is defined per IEC 61000-4-5 (10/1000 μs) and ANSI/IEEE C62.35 standards.
It exhibits a positive temperature coefficient of VBR (114 mV/°C), enabling predictable voltage drift under thermal stress, and achieves clamping within 1.0 ps from 0 V to VBR - critical for protecting fast-edge logic and microcontroller I/O pins against ESD events per IEC 61000-4-2.
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 V / 115 V @ 1 mA - Ensures reliable triggering above system operating voltage with margin |
| VC @ IPPM | 151 V @ 3.4 A - Limits downstream voltage during 10/1000 μs surge to safe levels for 100 V-rated ICs |
| PPK | 500 W - Sustains single-event surges compliant with ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 Level 4 |
| IR @ VWM | <1 μA - Minimizes standby power loss and avoids false triggering in high-impedance sensing circuits |
| TJ max | 175 °C - Enables placement near hot components (e.g., power MOSFETs, engine control units) without derating |
| Package | DO-204AC (DO-15) - Industry-standard through-hole package with tin-plated leads, UL 94V-0 molding |
Pinout & Package
DO-204AC (DO-15) package: axial-leaded, molded plastic case with cathode band marking polarity. 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 | Ground reference terminal | Connected to system ground or low-side return path; defines unidirectional clamping direction |
| Cathode | Protected line terminal | Connected to protected line (e.g., battery rail, LIN bus); conducts surge current to ground when V > VBR |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive underhood applications including temperature cycling, humidity bias, and mechanical shock per stress test requirements |
| Clamping voltage ≤151 V | Guarantees downstream ICs rated for 100 V absolute maximum survive ISO 7637-2 Pulse 5a (100 V/100 ms) transients |
| Response time <1.0 ps | Protects high-speed interfaces (e.g., CAN FD, LIN) before transient energy couples into signal paths |
| RoHS & halogen-free | Complies with IEC 61249-2-21 and automotive ELV directive for lead-free manufacturing and end-of-life recycling |
| Low IR <1 μA @ 85 V | Enables use in always-on battery circuits (e.g., vehicle telematics) without measurable quiescent current penalty |
Applications
| Automotive Power Rail Protection | CAN Bus Transient Suppression |
|---|---|
Use Scenario: Protecting 12 V/24 V battery-fed ECUs from load dump and alternator ripple transients per ISO 7637-2. IC Role / Device Role: Unidirectional TVS placed between battery rail and DC-DC input, clamping surges >85 V to ≤151 V. Use Value: Prevents damage to buck controller ICs (e.g., TPS543x) by limiting peak voltage below their 100 V abs max rating during 100 V/400 ms load dump events. | Use Scenario: Shielding CANH/CANL lines from ESD and coupled transients in body control modules. IC Role / Device Role: One SA85AH per line (CANH-to-GND, CANL-to-GND), leveraging fast <1.0 ps response to suppress IEC 61000-4-2 ±8 kV contact discharge. Use Value: Maintains CAN signal integrity by clamping transients before they distort differential voltage beyond ±12 V common-mode range of transceivers like TCAN1042. |
| Industrial Sensor Interface Protection | LIN Bus Overvoltage Guard |
Use Scenario: Safeguarding analog sensor inputs (e.g., pressure, temperature) connected to 24 V supply in factory automation PLCs. IC Role / Device Role: Placed on sensor VDD line upstream of LDO regulator, absorbing inductive kickback from solenoid drivers. Use Value: Eliminates need for external series resistor + capacitor filtering by providing low-impedance clamp path that holds VDD ≤151 V during 500 W surges. | Use Scenario: Securing LIN slave nodes (e.g., door module actuators) against battery reversal and jump-start transients. IC Role / Device Role: Unidirectional TVS from LIN bus to ground, rated for 85 V stand-off to tolerate normal 12 V ±10% operation plus ripple. Use Value: Blocks reverse polarity events up to –170 V while allowing normal LIN signaling (0–12 V) with <1 μA leakage, preserving bus timing margins. |
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 (85 V), but bidirectional; higher VC (137 V); SMA package (SMT) | Requires PCB layout change; suitable only where bidirectional clamping is needed (e.g., AC-coupled lines) | Select SMAJ85A only if space-constrained SMT design and symmetrical surge threat exist. |
| P6SMB85A | Same VWM (85 V), unidirectional; identical DO-204AC package; slightly higher VC (137 V); 600 W rating | Direct drop-in replacement in through-hole designs; higher surge margin but lower clamping precision | Choose P6SMB85A when higher single-pulse energy handling (600 W vs. 500 W) outweighs tighter VC requirement. |
Compared with SA85AH, SMAJ85A offers surface-mount compatibility and bidirectional protection but requires redesign and sacrifices clamping accuracy; P6SMB85A matches the DO-204AC footprint and unidirectional function while delivering greater surge headroom at the cost of 14 V higher clamping voltage.
Availability
SA85AH is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface protection, and LIN/CAN bus hardening requiring stable component supply across extended temperature and lifecycle demands.
Supply support for SA85AH 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 is engineered specifically for AEC-Q101-compliant transient suppression in harsh automotive environments, emphasizing high-temperature reliability, low leakage, and precise clamping performance across 5–170 V VWM range.
FAQ
What is the maximum clamping voltage of SA85AH under standard 10/1000 μs surge conditions?
The SA85AH has a maximum clamping voltage (VC) of 151 V when subjected to its rated peak pulse current of 3.4 A under the 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and ensures downstream components see no more than 151 V during standardized surge events, making SA85AH suitable for protecting 100 V-rated ICs in automotive power domains.
Is SA85AH compatible with lead-free reflow soldering processes?
SA85AH uses pure tin-plated leads compliant with J-STD-002 for solderability, and its DO-204AC (DO-15) package is rated for lead-free wave and hand-soldering. While not designed for reflow (as it is axial through-hole), it supports lead-free assembly when used with appropriate preheat and dwell profiles - confirming SA85AH meets RoHS and halogen-free requirements per IEC 61249-2-21.
Does SA85AH meet AEC-Q101 requirements for automotive underhood use?
Yes, SA85AH is explicitly AEC-Q101 qualified, as indicated by the "H" suffix in its ordering code. It undergoes full stress testing including temperature cycling, high-temperature reverse bias, and mechanical shock per AEC-Q101 Rev D, supporting operation from –55 °C to +175 °C junction temperature - validating SA85AH for engine control, transmission, and body electronics applications.
How does the temperature coefficient affect SA85AH's breakdown voltage in real-world operation?
SA85AH has a VBR temperature coefficient of +114 mV/°C, meaning its breakdown voltage increases linearly with junction temperature. At 150 °C, VBR rises ~11.4 V above its 25 °C value - ensuring consistent overvoltage triggering even in hot underhood environments. This behavior is documented in the SA Series datasheet and directly impacts SA85AH's margin over VWM in thermally stressed designs.
Can SA85AH be used for bidirectional transient suppression?
No, SA85AH is a unidirectional TVS diode, intended for DC line-to-ground protection only. Its cathode band marking and electrical specifications (e.g., forward voltage VF = 3.5 V @ 35 A) confirm asymmetrical conduction. For bidirectional applications such as AC signal lines or differential buses, SA85A (bidirectional variant) or SMAJ85A must be used instead - SA85AH is not rated or characterized for reverse conduction.
SA85AH 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:
- 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)
SA85AH FAQ
1.How can I place an order for SA85AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SA85AH 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 SA85AH reliable?
The price and inventory of SA85AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA85AH is usually 5 days.
3.What payment methods are accepted for SA85AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA85AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA85AH?
SA85AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA85AH 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 SA85AH?
For technical support, including SA85AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA85AH requirements.
6.How does Aetrix verify that SA85AH is sourced from the original manufacturer or authorized distributors?
All SA85AH 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 SA85AH meets industry standards.
7.What is the process for return or replacement of SA85AH?
All SA85AH units undergo pre-shipment inspection (PSI). If there is an issue with SA85AH, 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 SA85AH part is unused and in its original packaging.
Return procedure for SA85AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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