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Taiwan Semiconductor Corporation SA48A
- Part No.:
- SA48A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA48A.pdf
- Description:
- TVS DIODE 48VWM 77.4VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,015
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Product details
Overview
SA48A from Taiwan Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in DO-204AC (DO-15) package, rated for 500W peak pulse power at 10/1000μs, 48V working stand-off voltage (VWM), 53.3–58.9V breakdown voltage (VBR), and 77.4V maximum clamping voltage (VC) at 6.7A peak pulse current - designed for automotive-grade ESD and load-dump protection in power supply rails and signal lines.
For engineers reviewing the SA48A datasheet, SA48A pinout, SA48A application, or SA48A equivalent, key selection criteria include clamping performance under 10/1000μs surge, unidirectional polarity marking, AEC-Q101 qualification status, thermal derating above 25°C, and compatibility with J-STD-002 solderability requirements on pure tin-plated leads.
Technical Context
The SA48A operates as a silicon avalanche diode that enters controlled breakdown when reverse voltage exceeds VBR (53.3–58.9V), limiting transient energy by clamping to ≤77.4V at 6.7A. Its fast response time (<1.0ps from 0V to VBR) ensures protection of downstream ICs against ESD and electrical fast transients.
It features low leakage (<1μA at 48V), a 175°C maximum junction temperature, and is rated for 70A non-repetitive forward surge (8.3ms half-sine). The device is unidirectional, with cathode band marking, and meets RoHS and halogen-free (IEC 61249-2-21) requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 48 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC rail margin. |
| VBR @ IT=1mA | 53.3–58.9 V - Breakdown voltage range at 1mA test current; determines precise turn-on threshold. |
| VC @ IPPM=6.7A | 77.4 V - Clamped voltage during 10/1000μs surge; directly limits stress on protected circuitry. |
| PPK | 500 W - Peak pulse power handling per 10/1000μs waveform; validates robustness against ISO 7637-2 Pulse 1/2/5a. |
| IR @ VWM | <1 μA - Reverse leakage at 48V; ensures minimal standby power loss and signal integrity in high-impedance nodes. |
| TJ max | 175 °C - Maximum junction temperature; supports operation in under-hood automotive environments. |
| Package | DO-204AC (DO-15) - Industry-standard axial-leaded package with 0.400g mass; compatible with through-hole reflow and wave soldering. |
Pinout & Package
DO-204AC (DO-15) package with axial leads: Cathode indicated by molded band; anode and cathode terminals are non-polarized in layout but functionally asymmetric. 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 (unmarked lead) | Forward current entry / Reverse voltage reference node | Connected to lower-potential side (e.g., GND or return path); defines directionality of clamping action. |
| Cathode (banded lead) | Avalanche conduction terminal / Surge current sink | Connected to protected line (e.g., 48V rail); conducts surge current to ground during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified option (SA48AH) | Validated for automotive powertrain and chassis applications per stress test requirements including HTOL, TC, UHAST. |
| Clamping ratio VC/VBR | ≤1.45 - Low clamping ratio ensures tight voltage margin between VBR and VC, minimizing risk of over-clamp damage. |
| Response time | <1.0 ps - Enables protection against sub-nanosecond ESD events (IEC 61000-4-2) without propagation delay. |
| Surge robustness | 500W @ 10/1000μs - Matches ISO 7637-2 Pulse 5a (load dump) and IEC 61000-4-5 Line-to-Ground surges. |
| Halogen-free & RoHS | Complies with IEC 61249-2-21 and EU RoHS Directive - Supports green manufacturing and end-of-life compliance. |
Applications
| Automotive Power Supply Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: 48V battery rail in mild-hybrid vehicles subjected to load dump transients up to 60V and ISO 7637-2 Pulse 5a. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between 48V rail and chassis ground to clamp surges before they reach DC-DC converters and microcontrollers. Use Value: Limits peak voltage to ≤77.4V during 500W transients, preventing latch-up or gate oxide rupture in 65V-rated power stages. | Use Scenario: Analog sensor output (e.g., pressure or temperature) routed across noisy industrial enclosures with EFT coupling. IC Role / Device Role / Timing Role: Signal-line TVS on 0–5V or 0–10V analog outputs, mounted adjacent to connector to shunt fast transients before reaching ADC input. Use Value: Sub-1ps response ensures clamping occurs within first nanosecond of EFT burst (IEC 61000-4-4), preserving signal fidelity and avoiding ADC saturation. |
| LED Driver Overvoltage Clamp | RS-485 Transceiver Port Protection |
Use Scenario: Constant-current LED driver output exposed to inductive kickback from relay-controlled loads in signage systems. IC Role / Device Role / Timing Role: TVS connected across LED string output to absorb 100–200V inductive spikes generated during switch-off. Use Value: 48V VWM allows normal 42–56V LED string operation while clamping 150V+ spikes to ≤77.4V, protecting MOSFET switches and current sense resistors. | Use Scenario: RS-485 bus lines in factory automation subject to lightning-induced surges and ground potential differences. IC Role / Device Role / Timing Role: Unidirectional SA48A placed on each data line (A/B) referenced to local ground, with series current-limiting resistors. Use Value: 77.4V clamping prevents damage to ±15V-rated transceivers (e.g., THVD1550) during 1kV/2kV surge tests per IEC 61000-4-5. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ48A | Same DO-214AC (SMA) package; 48V VWM, 77.4V VC @ 6.7A; slightly higher IR (≤5μA vs. <1μA). | Surface-mount only; requires PCB rework for through-hole legacy designs. | Select SMAJ48A for space-constrained SMT layouts; SA48A remains preferred for through-hole reliability and thermal mass in high-energy surge paths. |
| P6KE48A | DO-15 package identical to SA48A; 48V VWM, 75.5V VC @ 6.8A; lower PPK (600W vs. 500W), but wider VBR tolerance (53.3–63.6V). | Higher clamping variation increases design margin uncertainty; no AEC-Q101 variant available. | Choose P6KE48A only if higher peak power rating is critical and AEC-Q101 compliance is not required. |
Compared with SMAJ48A and P6KE48A, the SA48A offers tighter VBR tolerance (53.3–58.9V), lower leakage (<1μA), and optional AEC-Q101 qualification (SA48AH), making it optimal for automotive 48V systems where precision clamping and qualification traceability are mandatory.
Availability
SA48A is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, and LED driver overvoltage clamping requiring stable component supply, long-term lifecycle support, and AEC-Q101-compliant variants.
Supply support for SA48A 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, with global distribution and AEC-Q101 validation capability.
The SA Series is TSC's standard unidirectional/bidirectional TVS platform engineered for high-energy transient suppression in automotive, industrial, and lighting applications - optimized for DO-204AC packaging, low clamping ratio, and robust surge endurance.
FAQ
What is the maximum clamping voltage of the SA48A under standard 10/1000μs surge conditions?
The SA48A has a maximum clamping voltage (VC) of 77.4 V at 6.7 A peak pulse current under the 10/1000μs waveform. This value is measured per ANSI/IEEE C62.35 and represents the upper limit of voltage seen by protected circuitry during a standardized surge event - critical for ensuring downstream components remain within their absolute maximum ratings.
Is the SA48A suitable for automotive applications requiring AEC-Q101 qualification?
Yes - the SA48A itself is not AEC-Q101 qualified, but its direct variant SA48AH (same electrical specs, marked with "H" suffix) is fully AEC-Q101 qualified. Engineers specifying SA48A for automotive use should select SA48AH to meet functional safety and reliability requirements for powertrain and body electronics.
How does the SA48A differ from the SA48 (non-A version) in terms of electrical performance?
The SA48A and SA48 share identical VWM (48 V), package (DO-204AC), and PPK (500 W), but differ in VBR range: SA48A is 53.3–58.9 V, while SA48 is 53.3–65.2 V. This tighter VBR tolerance in SA48A enables more predictable clamping onset and reduced design margin uncertainty in precision protection circuits.
What is the reverse leakage current specification for SA48A at its working stand-off voltage?
The SA48A specifies reverse leakage current (IR) of less than 1 μA at its full working stand-off voltage of 48 V. This ultra-low leakage preserves signal integrity in high-impedance sensor interfaces and minimizes quiescent power loss in always-on 48V subsystems such as vehicle domain controllers.
Can SA48A be used in bidirectional configurations?
No - SA48A is strictly unidirectional, with cathode band marking and asymmetrical IV characteristics. For bidirectional protection at 48V, engineers must select SA48CA (if available in the SA Series) or use back-to-back SA48A devices; however, the SA Series documentation confirms CA suffix denotes bipolar types, and SA48CA is not listed in the provided data.
SA48A 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:
- 77.4V
- Current - Peak Pulse (10/1000µs):
- 6.7A
- 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)
SA48A FAQ
1.How can I place an order for SA48A through Aetrix?
Please submit a Request for Quotation (RFQ) for SA48A 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 SA48A reliable?
The price and inventory of SA48A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA48A is usually 5 days.
3.What payment methods are accepted for SA48A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA48A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA48A?
SA48A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA48A 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 SA48A?
For technical support, including SA48A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA48A requirements.
6.How does Aetrix verify that SA48A is sourced from the original manufacturer or authorized distributors?
All SA48A 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 SA48A meets industry standards.
7.What is the process for return or replacement of SA48A?
All SA48A units undergo pre-shipment inspection (PSI). If there is an issue with SA48A, 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 SA48A part is unused and in its original packaging.
Return procedure for SA48A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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