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Taiwan Semiconductor Corporation SA48AH
- Part No.:
- SA48AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA48AH.pdf
- Description:
- TVS DIODE 48VWM 77.4VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,355
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Product details
Overview
SA48AH from Taiwan Semiconductor is an AEC-Q101-qualified unidirectional transient voltage suppressor (TVS) diode in DO-204AC (DO-15) package, rated for 500W peak pulse power at 10/1000μs, with 48V working stand-off voltage (VWM), 53.3–65.2V breakdown voltage (VBR @ 1mA), and 85.5V maximum clamping voltage (VC) at 6.1A peak pulse current - deployed for automotive ESD and load-dump protection in power supply rails.
For engineers reviewing the SA48AH datasheet, SA48AH pinout, SA48AH application, or SA48AH equivalent, this page delivers verified electrical parameters, DO-15 terminal polarity mapping, automotive-grade reliability data, clamping performance under IEC 61000-4-5 surge conditions, and direct alternatives for board-level overvoltage hardening in 12V/24V vehicle subsystems.
Technical Context
The SA48AH operates as a unidirectional avalanche diode, triggering conduction when reverse voltage exceeds its VBR range (53.3–65.2V), clamping transients to ≤85.5V at 6.1A. Its low dynamic impedance ensures rapid energy diversion during fast-rising EFT or ISO 7637-2 pulses.
Designed for automotive environments, it sustains 175°C junction temperature, meets JESD201 Class 2 whisker resistance, and features pure tin-plated leads compliant with J-STD-002 solderability - enabling reliable reflow and wave soldering in engine control units and body electronics.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 48 V - Maximum continuous reverse operating voltage before leakage exceeds 1 μA; sets safe margin below system rail (e.g., 42V max in 48V automotive systems) |
| VBR @ 1mA | 53.3–65.2 V - Measured breakdown threshold at 1mA test current; defines turn-on consistency across production lot |
| VC @ IPPM | 85.5 V at 6.1 A - Clamped voltage during 10/1000μs surge; determines protected IC's voltage stress ceiling |
| PPK | 500 W - Peak pulse power rating per IEC 61000-4-5; supports single-event surge immunity up to Level 4 (4kV line-earth) |
| IR @ VWM | <1 μA - Reverse leakage at 48V; negligible power loss and thermal impact in always-on monitoring circuits |
| TJ MAX | 175 °C - Maximum junction temperature; enables placement near heat sources (e.g., power MOSFETs) without derating |
| Package | DO-204AC (DO-15) - Industry-standard axial leaded package with cathode band marking; compatible with legacy through-hole assembly lines |
Pinout & Package
DO-204AC (DO-15) package with axial leads: Cathode marked by band on body; Anode and Cathode terminals defined by polarity marking - no internal circuitry, purely passive two-terminal device.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Reverse voltage reference node | Connected to system ground or lower-potential rail; establishes reference for clamping action |
| Cathode | Reverse voltage input / Surge current sink | Connected to protected line (e.g., battery feed); conducts surge current to ground when V > VBR |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive use per stress test requirements including HTOL, TCT, and ESD-HBM/MM - enables deployment in powertrain and ADAS modules |
| Fast response time | <1.0 ps from 0V to VBR - sub-picosecond avalanche initiation ensures clamping before transient edge propagates into downstream ICs |
| Low clamping ratio (VC/VBR) | ~1.32 (85.5V / 65.2V max) - tight voltage margin between breakdown and clamping improves system-level overvoltage safety factor |
| Halogen-free & RoHS | Complies with IEC 61249-2-21 and EU RoHS Directive - meets environmental compliance for global vehicle OEMs |
| UL 94V-0 molding compound | Flame-retardant encapsulation - prevents fire propagation in high-energy fault scenarios within enclosed ECUs |
Applications
| Automotive Power Rail Protection | LED Lighting Driver Input Protection |
|---|---|
Use Scenario: 12V/24V battery feed lines in engine control units exposed to ISO 7637-2 pulse 1 (inductive switch-off) and pulse 5a (load dump). IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and DC-DC converter input to clamp transients before they reach regulator ICs. Use Value: Limits voltage to ≤85.5V during 100V/100ms load dump events, preventing damage to 100V-rated buck controllers and preserving system uptime. |
Use Scenario: Constant-current LED driver inputs in headlamp modules subjected to ESD contact discharge per ISO 10605 (±15kV). IC Role / Device Role / Timing Role: Front-end TVS shunting ESD current away from LED driver IC's VIN pin and internal LDO. Use Value: Sub-1ps response captures ESD edge before IC input structures fail, reducing field failure rate in exterior lighting assemblies. |
| Industrial PLC Digital Input Protection | Automotive Body Control Module (BCM) CAN Bus Power Line |
Use Scenario: 24V digital input channels in programmable logic controllers interfacing with external sensors and switches. IC Role / Device Role / Timing Role: TVS on each input channel limits induced surges from relay coil back-EMF or lightning-induced coupling on long field wiring. Use Value: 500W rating handles repetitive 1kV/500A surges per IEC 61000-4-4, extending maintenance intervals and reducing input module replacement costs. |
Use Scenario: 12V supply line feeding CAN transceiver power pins in body control modules subject to battery reversal and jump-start transients. IC Role / Device Role / Timing Role: Unidirectional SA48AH clamps positive overvoltage spikes while allowing normal 12V operation; paired with reverse-polarity protection diode. Use Value: Withstands 48V jump-start events and clamps to 85.5V, keeping transceiver VCC within ABSOLUTE MAX ratings and avoiding bus shutdown. |
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 SMAJ48A | Same DO-214AC package; 48V VWM, 53.3–64.8V VBR, 77.4V VC @ 6.5A - slightly lower clamping voltage but non-AEC-Q101 qualified | Acceptable for industrial/commercial designs; not certified for automotive under hood or chassis locations | Select SMAJ48A only if AEC-Q101 is not required and lower VC is prioritized over automotive qualification |
| ON Semiconductor 1.5SMC47A | DO-214AB package; 47V VWM, 52.2–63.8V VBR, 77.0V VC @ 6.5A - identical electrical specs but different mechanical footprint and thermal dissipation | Requires PCB layout change due to larger SMC package; higher thermal mass suits high-repetition surge environments | Choose 1.5SMC47A when board space allows larger package and enhanced thermal robustness is needed over strict DO-15 compatibility |
Compared with SMAJ48A and 1.5SMC47A, the SA48AH uniquely combines AEC-Q101 qualification, DO-15 form factor, and 500W surge capability - making it the only drop-in solution for legacy automotive through-hole designs requiring certified reliability without footprint or thermal redesign.
Availability
SA48AH is available at Aetrix Electronics and suitable for automotive ECU design, LED lighting systems, and industrial PLC input protection requiring stable component supply, long-term lifecycle support, and AEC-Q101-compliant surge immunity.
Supply support for SA48AH 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 automotive and industrial markets.
The SA Series was developed specifically for AEC-Q101-compliant transient suppression in 12V/24V/48V automotive power networks - emphasizing low clamping ratio, fast response, and robust thermal performance in compact DO-15 packaging.
FAQ
What does the "H" suffix in SA48AH signify?
The "H" suffix in SA48AH indicates full AEC-Q101 qualification per Rev D requirements, including high-temperature operating life (HTOL), temperature cycling (TCT), and human-body-model ESD testing. This certification confirms SA48AH's suitability for automotive under-hood and chassis applications where reliability under thermal and electrical stress is critical - unlike standard SA48A variants.
Is SA48AH bidirectional or unidirectional?
SA48AH is a unidirectional TVS diode, as confirmed by its DO-204AC package with cathode band marking and specification of VBR only for reverse bias (no bidirectional VBR min/max listed). It conducts surge current only when cathode voltage exceeds anode by ≥53.3V - making it appropriate for DC power rail protection but not AC or differential signal lines.
What is the maximum clamping voltage of SA48AH and at what current is it specified?
The maximum clamping voltage of SA48AH is 85.5 V, measured at 6.1 A peak pulse current (IPPM) under the standardized 10/1000 μs double-exponential surge waveform. This value is guaranteed across temperature and process variation per Taiwan Semiconductor's datasheet Table 3 and defines the upper voltage limit imposed on protected circuitry during worst-case transients.
Can SA48AH replace SA48A in an existing design?
Yes, SA48AH is a direct functional and mechanical replacement for SA48A - same DO-204AC package, identical electrical parameters (VWM = 48 V, VBR = 53.3–65.2 V, VC = 85.5 V), and shared pinout. The sole enhancement is AEC-Q101 qualification; no PCB or schematic changes are required when upgrading from SA48A to SA48AH for automotive programs.
What is the junction-to-ambient thermal resistance (RθJA) for SA48AH in typical PCB mounting?
Taiwan Semiconductor does not publish RθJA for SA48AH in the provided documentation. However, based on DO-204AC (DO-15) industry standards with 10×10 mm copper pads per lead, typical RθJA is ~100°C/W. For thermal design, use the absolute maximum TJ = 175°C and steady-state PD = 3 W rating - ensuring ambient temperature remains ≤75°C at full power dissipation.
SA48AH 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:
- -
- 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)
SA48AH FAQ
1.How can I place an order for SA48AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SA48AH 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 SA48AH reliable?
The price and inventory of SA48AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA48AH is usually 5 days.
3.What payment methods are accepted for SA48AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA48AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA48AH?
SA48AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA48AH 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 SA48AH?
For technical support, including SA48AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA48AH requirements.
6.How does Aetrix verify that SA48AH is sourced from the original manufacturer or authorized distributors?
All SA48AH 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 SA48AH meets industry standards.
7.What is the process for return or replacement of SA48AH?
All SA48AH units undergo pre-shipment inspection (PSI). If there is an issue with SA48AH, 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 SA48AH part is unused and in its original packaging.
Return procedure for SA48AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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