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Taiwan Semiconductor Corporation SA54
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- Part No.:
- SA54
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA54.pdf
- Description:
- 500W, 66.7V, UNIDIRECTIONAL, TVS
- Quantity:
- Payment:
- Shipping:
Inventory:2,237
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Product details
Overview
SA54 from Taiwan Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in DO-204AC (DO-15) package, rated for 54 V working stand-off voltage, 60.0–73.3 V breakdown voltage at 1 mA test current, 5.4 A peak pulse current, and 86.3 V maximum clamping voltage under 10/1000 µs surge. It delivers 500 W surge capability and protects automotive and industrial power rails against ESD and inductive switching transients.
For engineers reviewing the SA54 datasheet, SA54 pinout, SA54 application, or SA54 equivalent, this page provides verified electrical parameters, clamping behavior under standardized surge waveforms, thermal derating guidance, polarity marking details, and direct alternatives with documented VWM/VBR/VC alignment - all critical for robust overvoltage protection design in 12 V–48 V systems.
Technical Context
The SA54 operates as a unidirectional avalanche diode, triggering conduction when reverse voltage exceeds its specified VBR range (60.0–73.3 V), thereby shunting surge energy to ground while limiting downstream voltage to ≤86.3 V at 5.4 A. Its low leakage (<1 µA @ 54 V) ensures minimal standby power loss in always-on circuits.
Designed for non-repetitive 10/1000 µs surges per IEC 61000-4-5 and ANSI/IEEE C62.35, the SA54 exhibits <1.0 ps response time from 0 V to VBR and supports junction temperatures from –55 °C to +175 °C - enabling use in under-hood automotive environments and industrial motor drives where thermal stability is essential.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 54 V - Maximum continuous reverse operating voltage before significant leakage; defines safe DC rail margin for 48 V nominal systems. |
| VBR @ IT = 1 mA | 60.0–73.3 V - Breakdown voltage range at 1 mA test current; determines precise turn-on threshold under surge conditions. |
| VC @ IPPM = 5.4 A | 86.3 V - Clamping voltage during 10/1000 µs surge; sets absolute upper limit of protected circuit stress. |
| PPK | 500 W - Peak pulse power rating at TA = 25 °C; defines single-event surge energy handling capacity. |
| IR @ VWM | <1 µA - Reverse leakage current at 54 V; ensures negligible quiescent current draw in battery-powered applications. |
| TJ max | +175 °C - Maximum junction temperature; enables operation in high-ambient environments such as engine control units. |
| Package | DO-204AC (DO-15) - Industry-standard axial-leaded package with tin-plated leads; compatible with wave and reflow soldering per J-STD-002. |
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 | Ground reference terminal | Connected to system ground or low-side return path; completes conduction loop during reverse-biased surge events. |
| Cathode | Protected line input | Connected to the line being protected (e.g., 48 V supply rail); carries full surge current when clamping is activated. |
Key Features
| Feature | Design Value |
|---|---|
| 500 W surge rating at 10/1000 µs | Enables compliance with IEC 61000-4-5 Level 3 (1 kV/2 kV) surge immunity testing on 48 V power inputs. |
| <1.0 ps response time (0 V → VBR) | Ensures clamping activation before transient edges propagate into sensitive downstream ICs such as CAN transceivers or microcontrollers. |
| RoHS-compliant & halogen-free | Meets IEC 61249-2-21 requirements for environmentally restricted substances; suitable for automotive OEM supply chains. |
| AEC-Q101 qualified option (SA54H) | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock - required for under-hood ECUs. |
| UL 94V-0 molding compound | Provides flame-retardant encapsulation essential for safety-critical industrial and transportation equipment. |
Applications
| Automotive Power Rail Protection | Industrial PLC Input Protection |
|---|---|
Use Scenario: Protecting 48 V battery-fed control modules in ADAS domain controllers against load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 48 V rail and chassis ground to clamp transients exceeding 54 V. Use Value: Limits peak voltage to 86.3 V during 500 W surges, preventing damage to 100 V-rated MOSFETs and isolated DC-DC controllers. |
Use Scenario: Safeguarding digital input channels of programmable logic controllers exposed to inductive kickback from solenoid valves. IC Role / Device Role / Timing Role: Standoff protection device mounted at field-wire entry point to absorb 10/1000 µs transients induced by relay switching. Use Value: Maintains signal integrity by clamping spikes within 1.0 ps, ensuring no false triggering of 24 V digital inputs. |
| LED Driver Overvoltage Clamp | Telecom Power Interface Protection |
Use Scenario: Securing constant-current LED drivers in streetlight systems against lightning-induced surges on AC/DC front-end rails. IC Role / Device Role / Timing Role: Primary overvoltage clamp on bulk capacitor output, coordinated with upstream MOVs for staged energy absorption. Use Value: Withstands repeated 500 W pulses without degradation, extending driver lifetime in outdoor deployments. |
Use Scenario: Protecting PoE-powered network switches from fast transients coupled onto 48 V PSE lines via Ethernet cabling. IC Role / Device Role / Timing Role: Secondary-level TVS on DC input stage, supplementing primary GDT/MOV protection with sub-nanosecond response. Use Value: Low 1 µA leakage preserves efficiency in always-on telecom infrastructure while meeting IEC 61000-4-4 EFT requirements. |
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 SMAJ54A | VWM = 54 V, VBR = 60–66.3 V, VC = 87.1 V @ 5.3 A, same DO-214AC package but surface-mount; lower IPPM (5.3 A vs. 5.4 A). | Requires PCB redesign for SMD layout; better suited for space-constrained board areas where axial leads are impractical. | Select SMAJ54A only when automated assembly and footprint density outweigh axial lead serviceability and thermal mass advantages. |
| ON Semiconductor 1.5KE54A | VWM = 45.9 V, VBR = 51–56.7 V, VC = 88.0 V @ 17.0 A, larger DO-201AD package; higher IPPM but lower VWM tolerance. | Acceptable for 36 V systems but risks premature conduction on 48 V rails due to 45.9 V VWM; requires voltage-margin review. | Choose 1.5KE54A only if legacy 1.5 kW surge rating is mandatory and system VWM allows ≥10% derating below nominal rail. |
Compared with SA54, SMAJ54A offers identical VWM and clamping performance in an SMD form factor but sacrifices axial thermal dissipation and manual repairability; 1.5KE54A provides higher surge current headroom but compromises on 48 V system compatibility due to lower VWM - making SA54 the optimal balance of voltage margin, surge rating, and through-hole manufacturability.
Availability
SA54 is available at Aetrix Electronics and suitable for automotive power rail protection, industrial PLC input protection, LED driver overvoltage clamp, and telecom power interface protection requiring stable component supply across extended production cycles.
Supply support for SA54 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 power management, protection, and signal conditioning devices since 1979.
The SA Series was developed specifically for high-reliability transient suppression in automotive and industrial environments, emphasizing AEC-Q101 qualification, wide VWM coverage (5–170 V), and consistent 500 W surge capability across the family.
FAQ
What is the maximum clamping voltage of SA54 under standard surge conditions?
The SA54 has a maximum clamping voltage (VC) of 86.3 V when subjected to a 10/1000 µs surge waveform at its rated peak pulse current of 5.4 A. This value is measured per ANSI/IEEE C62.35 and defines the highest voltage that will appear across the protected line during a worst-case transient event. The SA54 maintains this clamping performance consistently across its operating temperature range from –55 °C to +175 °C.
Is SA54 suitable for automotive applications requiring AEC-Q101 qualification?
Yes - the SA54H variant is explicitly AEC-Q101 qualified and undergoes stress testing for temperature cycling, humidity bias, and mechanical shock per automotive reliability standards. While the base SA54 part is not qualified, TSC offers SA54H with identical electrical specifications and DO-204AC packaging. Engineers specifying SA54 for under-hood ECUs must select SA54H to meet OEM compliance requirements.
How does the SA54 compare to bidirectional TVS diodes like SA54CA?
The SA54 is unidirectional and intended for DC rail protection where polarity is fixed, offering lower leakage (<1 µA @ 54 V) and faster response (<1.0 ps). In contrast, SA54CA is bidirectional with symmetrical VBR in both directions (60.0–73.3 V), higher IR (≤1 µA per direction), and 5.0 ns response - making it suitable for AC-coupled or floating signal lines. SA54 cannot replace SA54CA in bipolar applications without circuit redesign.
What is the thermal derating behavior of SA54 above 25°C ambient?
The SA54's peak pulse power rating decreases linearly above 25°C ambient per Figure 2 in the datasheet: at 75°C, it retains ~70% of its 500 W rating, and at 125°C, ~40%. This derating applies to non-repetitive surges; steady-state power dissipation is limited to 3 W at TL = 75°C with 9.5 mm lead lengths. Designers must verify board layout and copper area to maintain safe junction temperatures during repeated surge events.
Can SA54 be used in parallel to increase surge current handling?
No - SA54 devices are not characterized for parallel operation due to parameter spread in VBR (60.0–73.3 V) and dynamic impedance. Mismatched breakdown voltages would cause uneven current sharing, leading to thermal runaway in the lower-VBR unit. For higher IPPM requirements, select a single higher-rated device (e.g., SA60 or SA64) or implement staged protection with upstream MOVs and downstream TVS diodes.
SA54 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:
- 86.3V
- Current - Peak Pulse (10/1000µs):
- 5.4A
- 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)
SA54 FAQ
1.How can I place an order for SA54 through Aetrix?
Please submit a Request for Quotation (RFQ) for SA54 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 SA54 reliable?
The price and inventory of SA54 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA54 is usually 5 days.
3.What payment methods are accepted for SA54?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA54 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA54?
SA54 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA54 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 SA54?
For technical support, including SA54 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA54 requirements.
6.How does Aetrix verify that SA54 is sourced from the original manufacturer or authorized distributors?
All SA54 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 SA54 meets industry standards.
7.What is the process for return or replacement of SA54?
All SA54 units undergo pre-shipment inspection (PSI). If there is an issue with SA54, 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 SA54 part is unused and in its original packaging.
Return procedure for SA54:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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