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Taiwan Semiconductor Corporation SA54CH
- Part No.:
- SA54CH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA54CH.pdf
- Description:
- 500W, 66.7V, BIDIRECTIONAL, TVS
- Quantity:
- Payment:
- Shipping:
Inventory:9,926
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Product details
Overview
SA54CH from Taiwan Semiconductor is a unidirectional 54 V working stand-off transient voltage suppressor (TVS) diode in DO-204AC (DO-15) package, rated for 500 W peak pulse power at 10/1000 μs, 60.0–73.3 V breakdown voltage at 1 mA test current, and clamps to ≤86.3 V at 5.4 A peak pulse current. It protects automotive-grade power rails and signal lines against ESD and inductive switching transients.
For engineers reviewing the SA54CH datasheet, SA54CH pinout, SA54CH application, or SA54CH equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, clamping performance under standardized surge waveforms, and real-world protection use cases for 12 V/24 V automotive systems and industrial control interfaces.
Technical Context
The SA54CH is a unidirectional silicon avalanche diode designed to shunt high-energy transients away from sensitive downstream circuitry by entering avalanche conduction when reverse voltage exceeds its breakdown threshold. Its low dynamic impedance ensures stable clamping during fast-rising surges.
It operates across –55 °C to +175 °C junction temperature range, supports 70 A non-repetitive forward surge current (8.3 ms half-sine), and exhibits <1 μA reverse leakage above 10 V - critical for low-power standby circuits. The device is AEC-Q101 qualified and halogen-free per IEC 61249-2-21.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 54 V - maximum continuous reverse operating voltage before clamping begins; sets system-level overvoltage immunity threshold |
| VBR min/max | 60.0 / 73.3 V at 1 mA - guaranteed avalanche onset range; defines minimum trigger margin above VWM |
| VC @ IPPM | ≤86.3 V at 5.4 A - maximum clamped voltage during 10/1000 μs surge; determines protected IC's voltage stress limit |
| PPK | 500 W - peak pulse power handling per 10/1000 μs waveform; validates robustness against ISO 7637-2 Pulse 1/2a/5a |
| TJ max | +175 °C - maximum junction temperature; enables placement near hot components in engine bay or power modules |
| IR @ VWM | <1 μA - ultra-low reverse leakage at rated stand-off voltage; preserves battery life in always-on automotive modules |
| AEC-Q101 | Qualified - certified for automotive applications per stress test requirements including HTOL, TCT, and ESD HBM/MM |
Pinout & Package
Package: DO-204AC (DO-15), axial leaded, epoxy-molded case with UL 94V-0 flammability rating and pure tin-plated leads compliant with J-STD-002 solderability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / cathode-referenced ground path | Connected to system ground or low-side return; completes clamping path during transient events |
| Cathode | Reverse-biased input / protected line connection | Connected to protected node (e.g., LIN bus, sensor supply); conducts avalanche current when VREV > VBR |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive underhood and chassis applications including temperature cycling, humidity bias, and mechanical shock |
| Fast response time | <1.0 ps from 0 V to VBR - enables suppression of sub-nanosecond ESD events before IC damage occurs |
| Low clamping ratio | VC/VBR ≈ 1.22 - tight voltage margin between breakdown and clamping ensures minimal overvoltage exposure |
| Halogen-free construction | Complies with IEC 61249-2-21 - meets automotive OEM environmental mandates and RoHS 3 requirements |
| High surge current capability | IPPM = 5.4 A at 10/1000 μs - sustains multiple ISO 7637-2 Pulse 5a transients without degradation |
Applications
| Automotive LIN Bus Protection | 12 V Power Rail Surge Suppression |
|---|---|
Use Scenario: Protecting LIN transceivers and microcontrollers in body control modules from load dump and inductive kickback. IC Role / Device Role / Timing Role: Unidirectional TVS placed between LIN line and ground to clamp negative transients while preserving DC bias. Use Value: Limits voltage to ≤86.3 V during 5.4 A surges, preventing latch-up or gate oxide rupture in 5 V tolerant LIN PHYs. |
Use Scenario: Safeguarding 12 V supply inputs of infotainment head units and ADAS cameras against ISO 7637-2 Pulse 1 (inductive switch-off). IC Role / Device Role / Timing Role: Primary front-end TVS on main power rail, upstream of DC/DC converters and LDOs. Use Value: Absorbs 500 W transient energy without failure, maintaining system uptime and avoiding fuse blow during repeated surges. |
| Industrial Sensor Interface Protection | Automotive Lighting Driver ESD Guard |
Use Scenario: Shielding analog sensor outputs (e.g., pressure, temperature) in factory automation PLC I/O modules from EFT and cable discharge. IC Role / Device Role / Timing Role: Low-leakage (≤1 μA) TVS on signal lines referenced to local ground, minimizing offset error. Use Value: Clamps 4 kV ESD (IEC 61000-4-2) to safe levels while adding <1 pF capacitance - no signal integrity impact on 10 kHz sensor bandwidth. |
Use Scenario: Protecting LED driver ICs in headlamp control units from human-body-model ESD during assembly and service. IC Role / Device Role / Timing Role: Cathode-connected to LED anode line; shunts positive transients to ground during contact discharge. Use Value: Responds in <1 ps to 8 kV contact ESD, limiting voltage to 86.3 V and preventing driver output stage failure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ54A | Unidirectional, 54 V VWM, 60.0–66.3 V VBR, 5.4 A IPPM, SMA package (surface-mount) | Requires PCB rework for SMT layout; lacks AEC-Q101 qualification | Select when board space is constrained and automotive qualification is not required |
| 1.5KE54CA | Bidirectional, 54 V VWM, 60–66.3 V VBR, 5.4 A IPPM, DO-201AD package, higher thermal resistance | Clamps both polarities - unnecessary for DC-coupled automotive rails; larger footprint than DO-15 | Choose only if bipolar protection is explicitly needed and leaded through-hole mounting is acceptable |
Compared with SMAJ54A and 1.5KE54CA, the SA54CH provides AEC-Q101 assurance, tighter VBR tolerance (60.0–73.3 V vs. 60.0–66.3 V), lower thermal resistance in DO-15, and optimized clamping for 12 V automotive systems - making it the preferred choice where qualification, reliability, and legacy through-hole compatibility are mandatory.
Availability
SA54CH is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, and lighting control systems requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SA54CH 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 analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in TVS diodes, rectifiers, and power MOSFETs for industrial and automotive markets.
The SA Series was developed specifically for AEC-Q101-compliant transient protection in harsh automotive environments - emphasizing high surge robustness, low leakage, and consistent clamping performance across wide temperature ranges.
FAQ
What does the "H" suffix in SA54CH signify?
The "H" suffix in SA54CH indicates full AEC-Q101 qualification per Rev D requirements, covering high-temperature operating life (HTOL), temperature cycling (TCT), and electrostatic discharge (HBM/MM). This certification confirms SA54CH is approved for use in automotive powertrain, chassis, and body electronics where reliability under thermal and mechanical stress is critical.
Is SA54CH unidirectional or bidirectional?
SA54CH is a unidirectional TVS diode, with polarity marked by a cathode band on the DO-15 package. It clamps only reverse-voltage transients applied to the cathode terminal and conducts forward current like a standard diode - making it ideal for protecting DC-powered lines such as 12 V supplies or LIN bus signals.
What is the clamping voltage of SA54CH under a 10/1000 μs surge?
Under a standardized 10/1000 μs surge waveform, SA54CH clamps to a maximum of 86.3 V at its rated peak pulse current of 5.4 A. This value is measured per ANSI/IEEE C62.35 and guarantees that downstream ICs experience no more than this voltage during worst-case transients.
Can SA54CH replace SA54A in existing designs?
SA54CH can replace SA54A only if AEC-Q101 qualification is required and the design accommodates identical DO-204AC (DO-15) packaging and electrical specs. While both share VWM = 54 V and similar VBR/VC ratings, SA54CH adds automotive qualification and may differ in screening/test flow - verify qualification documentation before substitution.
What is the maximum junction temperature rating for SA54CH?
The maximum junction temperature (TJ) for SA54CH is +175 °C, enabling operation in high-ambient environments such as engine compartments or enclosed power modules. This rating is validated per AEC-Q101 stress testing and supports reliable long-term performance when mounted with appropriate thermal relief on PCB copper pads.
SA54CH 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):
- 54V
- Voltage - Breakdown (Min):
- 60V
- Voltage - Clamping (Max) @ Ipp:
- 86.3V
- Current - Peak Pulse (10/1000µs):
- 5.4A
- 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)
SA54CH FAQ
1.How can I place an order for SA54CH through Aetrix?
Please submit a Request for Quotation (RFQ) for SA54CH 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 SA54CH reliable?
The price and inventory of SA54CH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA54CH is usually 5 days.
3.What payment methods are accepted for SA54CH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA54CH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA54CH?
SA54CH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA54CH 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 SA54CH?
For technical support, including SA54CH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA54CH requirements.
6.How does Aetrix verify that SA54CH is sourced from the original manufacturer or authorized distributors?
All SA54CH 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 SA54CH meets industry standards.
7.What is the process for return or replacement of SA54CH?
All SA54CH units undergo pre-shipment inspection (PSI). If there is an issue with SA54CH, 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 SA54CH part is unused and in its original packaging.
Return procedure for SA54CH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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