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Taiwan Semiconductor Corporation SA48
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- Part No.:
- SA48
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA48.pdf
- Description:
- 500W, 59.3V, UNIDIRECTIONAL, TVS
- Quantity:
- Payment:
- Shipping:
Inventory:6,878
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Product details
Overview
SA48 from Taiwan Semiconductor is a unidirectional 500W transient voltage suppressor (TVS) diode in DO-204AC (DO-15) package, with 48V working stand-off voltage (VWM), 53.3–65.2V breakdown voltage (VBR @ 1mA), 85.5V maximum clamping voltage (VC) at 6.1A peak pulse current, and <1.0ps response time - deployed for automotive lighting and industrial power supply ESD/inductive transient protection.
For engineers reviewing the SA48 datasheet, SA48 pinout, SA48 application, or SA48 equivalent, this page delivers verified electrical parameters, DO-15 terminal polarity mapping, AEC-Q101 qualification status, clamping performance under 10/1000μs surge, and real-world use cases in 12V/24V automotive subsystems and DC-DC converter input stages.
Technical Context
The SA48 operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its VBR range (53.3–65.2V), clamping transients to ≤85.5V at 6.1A (10/1000μs). It features low leakage (<1μA @ 48V), 175°C max junction temperature, and meets IEC 61000-4-2/4-4/4-5 immunity requirements via its fast sub-picosecond turn-on.
Designed for surface-mount or through-hole mounting on 10×10 mm copper pads, the SA48 sustains 3W steady-state dissipation at TL = 75°C and handles 70A non-repetitive forward surge (8.3ms half-sine), making it suitable for protecting MOSFET gates and rectifier inputs against load dump and inductive kickback.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 48 V - Maximum continuous reverse operating voltage before conduction begins; defines system bus voltage compatibility (e.g., 48V nominal industrial rails) |
| VBR min/max | 53.3 / 65.2 V @ 1 mA - Breakdown threshold range ensures reliable triggering across process variation and temperature |
| VC @ IPPM | 85.5 V @ 6.1 A - Clamped voltage during 10/1000μs surge; limits downstream IC stress to safe levels |
| PPK | 500 W - Peak pulse power handling per single 10/1000μs event; supports automotive load-dump immunity |
| IR @ VWM | <1 μA - Ultra-low leakage preserves battery life and signal integrity in always-on circuits |
| TJ max | 175 °C - Enables operation in under-hood automotive environments and high-ambient industrial enclosures |
| Response time | <1.0 ps - Sub-picosecond turn-on prevents ESD damage to sensitive CMOS inputs before clamping engages |
Pinout & Package
DO-204AC (DO-15) package with axial leads; cathode indicated by band marking. 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 | Forward current path / low-side reference | Connected to ground or low-voltage rail; enables unidirectional clamping from cathode to anode |
| Cathode | Transient voltage input / protected line connection | Connected to the line being protected (e.g., 48V supply rail); conducts surge current to ground when V > VBR |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified option available | SA48H variant meets automotive-grade reliability testing (temperature cycling, HTRB, HTGB), enabling use in engine control and lighting modules |
| Low impedance surge path | Sub-1Ω dynamic impedance during clamping ensures minimal voltage overshoot during fast transients |
| Halogen-free & RoHS compliant | Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for environmentally constrained industrial and automotive programs |
| UL 94V-0 molding compound | Flame-retardant epoxy encapsulation prevents fire propagation in high-energy fault conditions |
Applications
| Automotive LED Headlamp Driver Protection | Industrial 48V DC-DC Converter Input Stage |
|---|---|
Use Scenario: Protecting LED driver ICs and MOSFETs from load dump (ISO 7637-2 Pulse 5a) and alternator-induced surges in 48V vehicle architectures. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 48V rail and ground, clamping transients within 1ps to prevent gate oxide rupture and latch-up. Use Value: Limits peak voltage to ≤85.5V during 500W surges, preserving driver IC reliability without derating design margins. | Use Scenario: Safeguarding synchronous buck controller inputs against inductive switching noise and EFT bursts in telecom power supplies. IC Role / Device Role / Timing Role: Standoff-rated TVS absorbing repetitive 10/1000μs transients on 48V input, coordinated with bulk capacitance for energy absorption. Use Value: Maintains <1μA leakage at 48V, avoiding quiescent current penalty while delivering 6.1A peak pulse current capability. |
| Smart Building PoE++ Power Sourcing Equipment | Factory Automation PLC Digital Input Protection |
Use Scenario: Shielding PoE++ PSE controller pins from cable discharge events (CDE) and lightning-induced surges on 4-pair 57V delivery lines. IC Role / Device Role / Timing Role: Unidirectional clamping device mounted at Ethernet port entry, referenced to local ground plane with minimal trace inductance. Use Value: Sub-1ps response ensures clamping initiates before CDE reaches PHY interface, meeting IEEE 802.3bt immunity targets. | Use Scenario: Protecting 24/48V digital input optocouplers and level-shifters from field-wiring ESD and relay coil flyback in harsh factory environments. IC Role / Device Role / Timing Role: Primary front-end TVS on dry-contact input channels, placed before series current-limiting resistor. Use Value: 175°C junction rating allows uninterrupted operation in sealed control cabinets exceeding 85°C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ48A | Same DO-214AC package, 48V VWM, but lower PPK (400W), higher VC (93.6V @ 4.3A), and slower response (~1ns) | Not AEC-Q101 qualified; suited for commercial-grade consumer power supplies, not automotive | Select SMAJ48A only if cost sensitivity outweighs automotive compliance and clamping voltage margin |
| P6SMB48A | DO-214AA package, identical VWM/VC specs, but rated for 600W PPK and 100°C TJ max (vs. 175°C) | Limited to industrial ambient ≤100°C; lacks halogen-free certification and JESD 201 whisker test compliance | Choose P6SMB48A where higher surge headroom is needed but extended temperature and environmental compliance are not required |
Compared with SMAJ48A and P6SMB48A, the SA48 offers superior thermal robustness (175°C TJ), automotive qualification path (via SA48H), tighter clamping (85.5V vs. ≥93.6V), and halogen-free construction - critical for long-lifecycle automotive and industrial deployments.
Availability
SA48 is available at Aetrix Electronics and suitable for automotive lighting systems, industrial 48V power converters, PoE++ power sourcing equipment, and factory automation PLC inputs requiring stable component supply with full traceability and lifecycle support.
Supply support for SA48 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, MOSFETs, and bipolar transistors since 1979.
The SA Series was developed specifically for high-reliability transient suppression in automotive and industrial power systems, emphasizing AEC-Q101 readiness, tight parametric distribution, and robust surge endurance in DO-15 packaging.
FAQ
What is the maximum clamping voltage of SA48 under standard 10/1000μs surge conditions?
The SA48 has a maximum clamping voltage (VC) of 85.5 V at 6.1 A peak pulse current under the 10/1000μs waveform. This value is measured per ANSI/IEEE C62.35 and guarantees that downstream circuitry sees no more than 85.5 V during a standardized surge event - a key parameter for validating overvoltage safety margins in 48V system designs using SA48.
Is SA48 unidirectional or bidirectional, and how is polarity marked?
The SA48 is a unidirectional TVS diode, with polarity indicated by a cathode band on the DO-204AC (DO-15) package body. The cathode terminal connects to the protected line (e.g., 48V rail), and the anode connects to ground - enabling clamping only during reverse overvoltage events. Bidirectional variants use "CA" suffixes (e.g., SA48CA), which SA48 does not carry.
Does SA48 meet automotive qualification standards?
The base SA48 is not AEC-Q101 qualified, but the SA48H variant - explicitly designated in TSC's ordering code - is AEC-Q101 qualified. SA48H undergoes accelerated stress testing including temperature cycling, high-temperature reverse bias, and humidity bias, making it suitable for automotive engine control, lighting, and ADAS subsystems where reliability is mandated.
What is the junction temperature limit and thermal derating behavior of SA48?
The SA48 has a maximum junction temperature (TJ) of 175°C and derates linearly above TA = 25°C per Figure 2 in the datasheet. At 75°C ambient, its peak pulse power drops to ~350W, and its steady-state power dissipation is rated at 3W when mounted on 10×10 mm copper pads - critical for thermal design validation in enclosed automotive or industrial housings where SA48 operates near thermal limits.
How does SA48 compare to SA48A in terms of breakdown voltage and application suitability?
The SA48 has a VBR range of 53.3–65.2 V, while SA48A tightens this to 53.3–58.9 V - offering improved parametric consistency for precision clamping. SA48A also exhibits lower temperature coefficient (56 mV/°C vs. 63 mV/°C) and slightly higher IPPM (6.7 A vs. 6.1 A), making it preferable in thermally stable, high-accuracy protection roles; SA48 remains optimal for cost-sensitive, high-volume applications where broader VBR tolerance is acceptable.
SA48 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):
- 48V
- Voltage - Breakdown (Min):
- 53.3V
- Voltage - Clamping (Max) @ Ipp:
- 85.5V
- Current - Peak Pulse (10/1000µs):
- 6.1A
- 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)
SA48 FAQ
1.How can I place an order for SA48 through Aetrix?
Please submit a Request for Quotation (RFQ) for SA48 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 SA48 reliable?
The price and inventory of SA48 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA48 is usually 5 days.
3.What payment methods are accepted for SA48?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA48 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA48?
SA48 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA48 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 SA48?
For technical support, including SA48 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA48 requirements.
6.How does Aetrix verify that SA48 is sourced from the original manufacturer or authorized distributors?
All SA48 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 SA48 meets industry standards.
7.What is the process for return or replacement of SA48?
All SA48 units undergo pre-shipment inspection (PSI). If there is an issue with SA48, 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 SA48 part is unused and in its original packaging.
Return procedure for SA48:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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