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Taiwan Semiconductor Corporation SA48CAH
- Part No.:
- SA48CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA48CAH.pdf
- Description:
- TVS DIODE 48VWM 77.4VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,811
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Product details
Overview
SA48CAH from Taiwan Semiconductor is a unidirectional AEC-Q101-qualified transient voltage suppressor (TVS) diode in DO-204AC (DO-15) package, designed for automotive and industrial overvoltage protection. It features 48 V working stand-off voltage (VWM), 53.3–65.2 V breakdown voltage (VBR @ 1 mA), 500 W peak pulse power (10/1000 µs), clamping voltage of 85.5 V at 6.1 A, and operating junction temperature up to +175 °C.
For engineers reviewing the SA48CAH datasheet, SA48CAH pinout, SA48CAH application, or SA48CAH equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, clamping performance under surge conditions, thermal derating behavior, and direct alternatives for automotive ESD and load-dump protection design.
Technical Context
The SA48CAH is a unidirectional silicon avalanche diode optimized for fast clamping of high-energy transients in automotive power rails and signal lines. Its low dynamic impedance enables stable clamping during 10/1000 µs surges up to 500 W, with sub-nanosecond response time (<1.0 ps from 0 V to VBR) and <1 µA reverse leakage above 10 V.
It operates across –55 °C to +175 °C junction temperature, supports 70 A non-repetitive forward surge current (8.3 ms half-sine), and meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements - confirming suitability for under-hood automotive environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 48 V - Maximum continuous DC or RMS voltage the device blocks without clamping; defines system operating rail compatibility. |
| VBR min/max | 53.3 V / 65.2 V @ 1 mA - Confirmed avalanche onset range; ensures reliable triggering before downstream IC damage thresholds. |
| VC @ IPPM | 85.5 V @ 6.1 A - Clamped voltage during full-rated 10/1000 µs surge; determines protected circuit's maximum transient exposure. |
| PPK | 500 W - Peak pulse power handling per IEEE C62.35; validates robustness against ISO 7637-2 Pulse 1, 2a, and 5a events. |
| TJ max | +175 °C - Maximum junction temperature; enables placement near hot components (e.g., engine control units) without thermal derating loss. |
| IR @ VWM | <1 µA - Reverse leakage at 48 V; minimizes standby power loss and avoids false triggering in high-impedance sensing circuits. |
| 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 polarity. 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 conduction terminal | Connected to lower-potential side (e.g., ground or return path); conducts during forward surge events (e.g., reverse battery). |
| Cathode | Avalanche clamping terminal | Connected to protected line (e.g., 12 V rail); enters breakdown when line voltage exceeds VBR, shunting surge current to ground. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - required for powertrain and body electronics. |
| 500 W surge rating (10/1000 µs) | Withstands ISO 7637-2 Load Dump Pulse 5a (up to 60 V, 400 ms) and ESD IEC 61000-4-2 contact discharge (±8 kV) without degradation. |
| Clamping voltage ≤85.5 V | Ensures protected microcontrollers (e.g., 5 V or 3.3 V I/O) remain below absolute maximum ratings during 6.1 A transient events. |
| Response time <1.0 ps | Activates before most semiconductor switching transients propagate - critical for safeguarding CAN, LIN, and sensor interfaces. |
| RoHS & halogen-free | Complies with IEC 61249-2-21 and EU RoHS Directive 2011/65/EU - supports green manufacturing and end-of-life compliance. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: 12 V battery line in engine control module exposed to load dump and jump-start transients. IC Role / Device Role: Primary clamping element placed between battery rail and DC-DC converter input. Use Value: Limits voltage to ≤85.5 V during 500 W surges, preventing damage to 100 V-rated input MOSFETs and enabling single-stage protection architecture. |
Use Scenario: Analog output line of pressure sensor in factory automation PLC I/O module. IC Role / Device Role: Signal-line TVS on 4–20 mA loop, positioned before op-amp buffer stage. Use Value: Sub-1 ps response suppresses EFT bursts (IEC 61000-4-4) before they saturate amplifier input stages, preserving measurement accuracy. |
| Automotive Lighting Driver Protection | On-Board Charger (OBC) DC Link Protection |
Use Scenario: LED headlamp driver subjected to ISO 16750-2 supply voltage spikes during cold crank. IC Role / Device Role: Unidirectional TVS across input capacitor of buck controller IC. Use Value: 48 V VWM matches nominal 48 V lighting bus; clamps transients to safe levels without affecting normal PWM dimming operation. |
Use Scenario: High-side DC link of 3.3 kW OBC exposed to regenerative braking voltage overshoot. IC Role / Device Role: Secondary clamping device parallel to main MOV, providing precise voltage limiting at 85.5 V. Use Value: Tight VBR tolerance (53.3–65.2 V) and low clamping ratio (VC/VBR ≈ 1.32) reduce stress on 100 V SiC MOSFETs during transient recovery. |
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; 48 V VWM, 53.3–64.8 V VBR, 87.1 V VC @ 5.8 A; 400 W PPK rating. | Lower peak power rating reduces margin for extended load dump events; higher clamping voltage increases stress on downstream FETs. | Preferred where board space allows SMD layout and lower cost is prioritized over AEC-Q101 validation. |
| ON Semiconductor 1.5SMC47A | DO-214AB package; 47 V VWM, 52.2–63.8 V VBR, 77 V VC @ 6.5 A; 1500 W PPK but larger footprint. | Higher PPK supports longer-duration surges; larger package limits use in compact automotive modules. | Selected when higher energy absorption is needed and axial DO-15 mounting is not feasible. |
Compared with SMAJ48A and 1.5SMC47A, SA48CAH uniquely combines AEC-Q101 qualification, DO-15 axial form factor, and 500 W capability - making it the only option validated for under-hood placement in production automotive ECUs without derating.
Availability
SA48CAH is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, and LED lighting driver surge suppression requiring stable component supply across multi-year production cycles.
Supply support for SA48CAH 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 devices since 1979.
The SA Series was engineered specifically for automotive-grade transient suppression, emphasizing AEC-Q101 compliance, high-temperature stability, and precise clamping performance in harsh environments like engine bays and battery management systems.
FAQ
What does the "H" suffix in SA48CAH signify?
The "H" suffix in SA48CAH explicitly denotes AEC-Q101 qualification per the manufacturer's ordering code specification. This means SA48CAH has undergone rigorous stress testing-including temperature cycling, highly accelerated life testing (HALT), and ESD verification-to ensure reliability in automotive applications. Unlike standard SA48CA variants, SA48CAH carries full documentation and test reports validating its use in safety-critical vehicle subsystems.
Is SA48CAH unidirectional or bidirectional, and how is polarity marked?
SA48CAH is a unidirectional TVS diode, indicated by the "A" in its part number per TSC's SA Series nomenclature. Polarity is marked by a cathode band on the DO-204AC (DO-15) package body - the banded end connects to the protected line (e.g., 12 V rail), while the unbanded end connects to ground. This configuration provides optimal clamping for positive-going transients only.
What is the maximum clamping voltage of SA48CAH under rated surge conditions?
The maximum clamping voltage of SA48CAH is 85.5 V, measured at 6.1 A peak pulse current (IPPM) using the standardized 10/1000 µs double-exponential waveform. This value is guaranteed across the full operating temperature range and forms the basis for downstream component voltage margining - for example, ensuring 100 V-rated MOSFETs remain within safe operating area during worst-case transients.
Can SA48CAH be used in place of SA48A, and what changes are required?
SA48CAH replaces SA48A directly in layouts using DO-204AC (DO-15) footprints, with identical pinout, dimensions, and soldering requirements. The key difference is AEC-Q101 qualification: SA48CAH adds automotive reliability validation but maintains identical electrical specs (VWM = 48 V, VBR = 53.3–65.2 V, VC = 85.5 V). No PCB or schematic changes are needed - only updated qualification documentation for automotive programs.
What is the junction-to-ambient thermal resistance (RθJA) of SA48CAH?
Taiwan Semiconductor does not publish RθJA for SA48CAH in the provided documentation; instead, thermal performance is defined via steady-state power dissipation (PD = 3 W at TL = 75 °C with 9.5 mm lead length) and junction temperature limits (TJ = –55 to +175 °C). For thermal design, engineers must follow the specified mounting condition: 10 × 10 mm copper pads per terminal, as derating curves in Fig.2 apply only under this layout constraint.
SA48CAH 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:
- -
- Bidirectional Channels:
- 1
- 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)
SA48CAH FAQ
1.How can I place an order for SA48CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for SA48CAH 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 SA48CAH reliable?
The price and inventory of SA48CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA48CAH is usually 5 days.
3.What payment methods are accepted for SA48CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA48CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA48CAH?
SA48CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA48CAH 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 SA48CAH?
For technical support, including SA48CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA48CAH requirements.
6.How does Aetrix verify that SA48CAH is sourced from the original manufacturer or authorized distributors?
All SA48CAH 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 SA48CAH meets industry standards.
7.What is the process for return or replacement of SA48CAH?
All SA48CAH units undergo pre-shipment inspection (PSI). If there is an issue with SA48CAH, 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 SA48CAH part is unused and in its original packaging.
Return procedure for SA48CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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