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Taiwan Semiconductor Corporation SA54A
- Part No.:
- SA54A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA54A.pdf
- Description:
- TVS DIODE 54VWM 87.1VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,826
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Product details
Overview
SA54A 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, with 60.0–66.3 V breakdown voltage, 87.1 V clamping voltage at 6.0 A, and <1 μA reverse leakage above 10 V - used for ESD and inductive switching protection in automotive lighting control modules.
For engineers reviewing the SA54A datasheet, SA54A pinout, SA54A application, or SA54A equivalent, this page delivers verified electrical parameters, clamping behavior under surge conditions, thermal derating guidance, DO-15 mechanical interface details, and direct alternatives for circuit-level ESD hardening in 12 V and 24 V automotive subsystems.
Technical Context
The SA54A operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its 60.0–66.3 V breakdown range at 1 mA test current. It clamps transients to ≤87.1 V at 6.0 A peak pulse current, with fast response (<1.0 ps from 0 V to VBR) and low dynamic impedance to limit energy delivered to downstream ICs.
Designed for single-polarity DC line protection, it features a maximum junction temperature of 175 °C, -55 °C to +175 °C operating range, and meets AEC-Q101 qualification when ordered with "H" suffix - though SA54A itself is the standard industrial-grade variant without AEC-Q101 marking per ordering code.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 54 V - maximum continuous reverse operating voltage before conduction begins; sets safe margin below system rail (e.g., 48 V nominal bus) |
| VBR @ IT=1 mA | 60.0–66.3 V - guaranteed avalanche initiation window; ensures predictable turn-on during overvoltage events |
| VC @ IPPM=6.0 A | 87.1 V - clamped voltage during 10/1000 μs surge; defines worst-case stress on protected IC inputs |
| PPK | 500 W - peak pulse power handling at TA=25°C; derates linearly above 25°C per Fig.2 |
| IR @ VWM | <1 μA - ultra-low reverse leakage at 54 V; avoids signal integrity degradation or battery drain in always-on circuits |
| TJ(max) | 175 °C - maximum junction temperature; supports operation in under-hood environments with minimal heatsinking |
Pinout & Package
DO-204AC (DO-15) axial-leaded package with cathode band marking; leads are pure tin-plated, solderable per J-STD-002, and meet JESD201 Class 2 whisker resistance. Weight ≈ 0.400 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current path / ground reference | Connected to system ground or low-side return; carries surge current during clamping |
| Cathode | Protected line input / high-side connection | Connected to line being protected (e.g., 48 V supply rail); blocks normal operation, conducts during overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| 500 W surge rating at 10/1000 μs | Withstands automotive load dump and ISO 7637-2 Pulse 5a without failure; validated per IEC 61000-4-5 |
| Clamping voltage ≤87.1 V at 6.0 A | Keeps protected ICs (e.g., CAN transceivers, microcontrollers) within absolute maximum ratings during transients |
| Breakdown tolerance ±5.2% (60.0–66.3 V) | Ensures consistent turn-on across production lots; eliminates need for binning in cost-sensitive designs |
| Response time <1.0 ps | Activates before most semiconductor junctions can be damaged by fast ESD events (e.g., IEC 61000-4-2 contact discharge) |
| RoHS & halogen-free (IEC 61249-2-21) | Complies with EU ELV and automotive OEM material declarations; enables global vehicle program acceptance |
Applications
| Automotive Lighting Control | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting LED driver ICs and MOSFET gate drivers from inductive kickback during headlamp switching. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 48 V supply rail and ground, clamping transients induced by relay or MOSFET turn-off. Use Value: Limits voltage spike to ≤87.1 V, preventing gate oxide rupture in 60 V-rated logic-level MOSFETs and latch-up in 5 V LDOs supplying driver bias. | Use Scenario: Shielding 24 V digital input channels from field wiring ESD and motor noise coupling. IC Role / Device Role / Timing Role: Standoff-rated TVS on each input line, referenced to common ground, absorbing fast transients before they reach optocoupler or Schmitt trigger inputs. Use Value: Sub-μA leakage preserves input hysteresis thresholds; 500 W rating handles repetitive surges from nearby VFDs without parameter drift. |
| Automotive Body Control Module (BCM) | DC Power Supply Input Stage |
Use Scenario: Safeguarding LIN bus transceivers and microcontroller GPIOs against battery reverse polarity and jump-start spikes. IC Role / Device Role / Timing Role: Unidirectional SA54A installed on 12 V/24 V supply input to BCM, upstream of DC-DC converter. Use Value: Clamps 120 V load dump transients to 87.1 V, allowing downstream regulators to maintain regulation and avoid brownout resets. | Use Scenario: Front-end protection for 48 V telecom or server PSUs exposed to lightning-induced surges on AC/DC input lines. IC Role / Device Role / Timing Role: Primary TVS on secondary-side 48 V output rail, guarding point-of-load converters and hot-swap controllers. Use Value: 175 °C max junction temperature enables reliable operation near heat-generating magnetics; DO-15 footprint allows manual rework in high-reliability assemblies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ54A | Same VWM (54 V), identical DO-214AC package; 600 W rating vs. SA54A's 500 W; slightly higher VC (93.6 V @ 6.2 A) | Higher surge margin suits harsher ISO 16750-2 environments; SMA package requires different PCB land pattern | Select SMAJ54A when board space permits SMC/SMA footprint and 600 W margin is required for extended lifetime testing. |
| P6KE56A | Lower VWM (45.4 V), same DO-15 package; 600 W rating; VC = 87.1 V @ 6.0 A - matches SA54A clamping but lower standoff | Less margin against normal 48 V rail ripple; suitable where tighter VWM/VBR ratio is acceptable for cost optimization | Choose P6KE56A only if system tolerates 45.4 V maximum continuous voltage and existing BOM already uses P6KE series. |
Compared with SMAJ54A and P6KE56A, the SA54A provides optimal balance of 54 V standoff, DO-15 compatibility, and 500 W surge capability - making it ideal for cost-sensitive, space-constrained automotive and industrial designs where exact 54 V rail protection is required without over-engineering.
Availability
SA54A is available at Aetrix Electronics and suitable for automotive lighting control, industrial PLC I/O protection, and body control module (BCM) power rail hardening requiring stable component supply across multi-year production cycles.
Supply support for SA54A 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 device manufacturer headquartered in Hsinchu, Taiwan, specializing in TVS diodes, rectifiers, Zener diodes, and MOSFETs for automotive and industrial markets.
The SA Series was developed specifically for robust, cost-effective transient suppression in 12 V–170 V DC systems - emphasizing tight VBR tolerance, low clamping ratio, and AEC-Q101 readiness for automotive electronics.
FAQ
What is the breakdown voltage range of the SA54A?
The SA54A has a guaranteed breakdown voltage (VBR) range of 60.0 V to 66.3 V at 1 mA test current, measured per ANSI/IEEE C62.35. This 6.3 V window ensures consistent clamping onset across temperature and production lots, supporting reliable design margins for 48 V and 54 V nominal systems. The SA54A's VBR is strictly unidirectional and defined only in reverse bias.
Does the SA54A meet AEC-Q101 qualification?
No - the SA54A is the standard industrial-grade variant. AEC-Q101 qualification is available only on versions marked with an "H" suffix (e.g., SA54AH), per TSC's ordering code table. The SA54A shares identical electrical specs and DO-204AC packaging but lacks the extended reliability testing required for automotive under-hood applications. Always verify part marking and datasheet revision for qualification status.
What is the clamping voltage of the SA54A at its rated peak pulse current?
The SA54A clamps to a maximum of 87.1 V at 6.0 A peak pulse current (IPPM), using the standard 10/1000 μs double-exponential waveform. This value is measured at TA = 25°C and defines the upper voltage limit imposed on protected circuitry during surge events. Derating applies above 25°C ambient per the pulse derating curve in the SA Series datasheet.
Can the SA54A be used in bidirectional configurations?
No - the SA54A is a unidirectional TVS diode, intended for DC line-to-ground protection only. Bidirectional operation requires the "CA" suffix variant (e.g., SA54CA), which contains two opposing diodes in series. Using SA54A in reverse-biased AC applications risks permanent damage due to forward conduction during negative half-cycles. Always match suffix (A = unidirectional, CA = bidirectional) to system topology.
What is the maximum steady-state power dissipation for the SA54A?
The SA54A has a steady-state power dissipation (PD) of 3 W at lead temperature (TL) = 75°C, with 9.5 mm (0.375") lead lengths mounted on 10 × 10 mm copper pads. This rating applies only to continuous DC or low-frequency leakage current heating - not transient surges. For sustained reverse bias near VWM, thermal design must ensure junction temperature stays ≤175°C using appropriate PCB copper area.
SA54A 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):
- 54V
- Voltage - Breakdown (Min):
- 60V
- Voltage - Clamping (Max) @ Ipp:
- 87.1V
- Current - Peak Pulse (10/1000µs):
- 6A
- 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)
SA54A FAQ
1.How can I place an order for SA54A through Aetrix?
Please submit a Request for Quotation (RFQ) for SA54A 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 SA54A reliable?
The price and inventory of SA54A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA54A is usually 5 days.
3.What payment methods are accepted for SA54A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA54A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA54A?
SA54A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA54A 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 SA54A?
For technical support, including SA54A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA54A requirements.
6.How does Aetrix verify that SA54A is sourced from the original manufacturer or authorized distributors?
All SA54A 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 SA54A meets industry standards.
7.What is the process for return or replacement of SA54A?
All SA54A units undergo pre-shipment inspection (PSI). If there is an issue with SA54A, 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 SA54A part is unused and in its original packaging.
Return procedure for SA54A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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