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Taiwan Semiconductor Corporation SA48CH
- Part No.:
- SA48CH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA48CH.pdf
- Description:
- 500W, 59.3V, BIDIRECTIONAL, TVS
- Quantity:
- Payment:
- Shipping:
Inventory:3,890
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Product details
Overview
SA48CH from Taiwan Semiconductor is a unidirectional AEC-Q101-qualified 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), and 53.3–65.2V breakdown voltage (VBR @ 1mA). It clamps transients to ≤85.5V at 6.1A peak pulse current and operates from –55°C to +175°C junction temperature - deployed in automotive power rail and ECU protection.
For engineers reviewing the SA48CH datasheet, SA48CH pinout, SA48CH application, or SA48CH equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, DO-15 mechanical data, clamping performance under IEC 61000-4-5 surge conditions, and direct alternatives with documented VWM/VBR/PPK alignment.
Technical Context
The SA48CH is a unidirectional silicon avalanche diode optimized for fast transient suppression on DC power lines. Its 1mA breakdown test current and 48V VWM enable reliable hold-off in 42V automotive systems while maintaining low leakage (<1μA above 10V) and sub-nanosecond response time (<1.0ps from 0V to VBR).
It complies with AEC-Q101 stress testing including high-temperature reverse bias, temperature cycling, and unbiased highly accelerated stress test (uHAST), and features pure tin-plated leads compliant with J-STD-002 solderability and JESD201 Class 2 whisker resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 48 V - Maximum continuous DC operating voltage before clamping begins; matches 42V nominal automotive battery systems with margin. |
| VBR min/max | 53.3 / 65.2 V @ 1 mA - Confirmed avalanche onset range ensures predictable turn-on during surge events without premature conduction. |
| VC @ IPPM | 85.5 V @ 6.1 A - Clamping voltage under 10/1000μs surge defines worst-case overvoltage seen by downstream ICs. |
| PPK | 500 W - Peak pulse power rating per IEC 61000-4-5 Level 4 (4kV) surge immunity requirements. |
| TJ max | +175 °C - Enables placement near hot engine-control units without thermal derating concerns. |
| IR @ VWM | <1 μA - Negligible leakage current preserves battery standby life in always-on vehicle modules. |
| Package | DO-204AC (DO-15) - Industry-standard axial leaded package with UL 94V-0 molding compound and 0.400g mass. |
Pinout & Package
DO-204AC (DO-15) package with axial leads: cathode indicated by band-marked end; anode is unmarked lead. Leads are pure tin-plated, solderable per J-STD-002, and meet JESD201 Class 2 whisker resistance. Mounting requires 10×10 mm copper pads per terminal for full 3W steady-state dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked lead) | Low-side reference node | Connected to ground or low-impedance return path; forms clamping loop with cathode during surge. |
| Cathode (banded lead) | High-side transient input | Connected to protected line (e.g., 42V supply rail); conducts avalanche current to ground when V > VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive under-hood applications including HTOL, TC, uHAST, and HTRB - required for ECU, body control, and ADAS power rail protection. |
| 500W 10/1000μs surge rating | Meets IEC 61000-4-5 Level 4 (4kV) surge immunity without derating at TA = 25°C; supports robust front-end protection in 12V/42V dual-battery systems. |
| <1.0ps response time | Enables clamping before sensitive logic or analog circuitry experiences damaging overvoltage - critical for CAN/LIN transceivers and microcontroller I/O rails. |
| RoHS & halogen-free | Complies with IEC 61249-2-21 and EU RoHS Directive 2011/65/EU - suitable for global automotive OEM production without material compliance risk. |
| UL 94V-0 molding compound | Ensures flame-retardant encapsulation in high-temperature environments such as engine compartments and junction boxes. |
Applications
| Automotive Power Rail Protection | ECU Input Stage Protection |
|---|---|
Use Scenario: Suppressing load dump and jump-start surges on 42V mild-hybrid vehicle battery feeds. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and DC-DC converter input to clamp transients before regulation stage. Use Value: Limits peak voltage to ≤85.5V during 500W surges, preventing damage to 100V-rated MOSFETs and gate drivers in buck converters. |
Use Scenario: Protecting microcontroller power pins and CAN transceiver VCC against ISO 7637-2 pulse 5a/b. IC Role / Device Role / Timing Role: Standoff device across 5V/3.3V supply rails upstream of LDOs to absorb fast-rising transients. Use Value: Sub-1ps response ensures clamping occurs within first nanosecond of surge onset, preserving signal integrity on high-speed communication interfaces. |
| Body Control Module (BCM) Inputs | LED Headlamp Driver Protection |
Use Scenario: Guarding LIN bus interface and sensor inputs against ESD and inductive switching noise from relays and solenoids. IC Role / Device Role / Timing Role: Low-leakage (≤1μA) TVS placed directly at connector entry point to shunt transients before signal conditioning circuitry. Use Value: Maintains <1μA leakage at 48V VWM, avoiding false triggers in high-impedance sensor bias networks and reducing system quiescent current. |
Use Scenario: Safeguarding constant-current LED driver ICs from flyback voltage spikes generated by PWM-controlled inductive loads. IC Role / Device Role / Timing Role: Parallel-connected TVS on driver output to clamp inductive kickback exceeding 85.5V clamping threshold. Use Value: 500W rating absorbs repetitive 10/1000μs pulses from 10A+ LED strings, extending driver IC lifetime in headlamp assemblies. |
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-H | Same VWM (48V), lower PPK (400W), SMA package (surface-mount), no AEC-Q101 listing in standard grade. | Preferred for space-constrained PCBs where reflow assembly is used; unsuitable for under-hood AEC-Q101 compliance requirements. | Select SMAJ48A-H only if board area is constrained and automotive qualification is not mandated. |
| P6SMB48AH | Same VWM (48V), identical DO-204AC package, 600W PPK, but AEC-Q101 qualified only in "Q" suffix variant (P6SMB48AQ). | Higher surge capacity suits heavy-duty commercial vehicles; requires verification of Q-suffix availability for automotive use. | Choose P6SMB48AH only if higher 600W rating is needed and AEC-Q101 is confirmed via P6SMB48AQ sourcing. |
Compared with SMAJ48A-H and P6SMB48AH, the SA48CH uniquely combines AEC-Q101 qualification, 500W 10/1000μs rating, and DO-204AC through-hole compatibility - making it the optimal choice for legacy automotive designs requiring proven reliability and wave-solder process support.
Availability
SA48CH is available at Aetrix Electronics and suitable for automotive electronics, industrial power supplies, and LED lighting systems requiring stable component supply with full AEC-Q101 traceability and long-term lifecycle assurance.
Supply support for SA48CH 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 for automotive, industrial, and consumer markets.
The SA Series was designed specifically for robust transient suppression in harsh automotive environments - emphasizing AEC-Q101 reliability, high-temperature operation, and precise VWM/VBR matching for 12V/42V/48V system architectures.
FAQ
What is the AEC-Q101 qualification status of the SA48CH?
The SA48CH is explicitly AEC-Q101 qualified, as confirmed in the SA Series datasheet Version L2105, Section 5 (Ordering Information), where the "H" suffix denotes AEC-Q101 compliance. This includes full stress testing per AEC-Q101 Rev D: HTOL, temperature cycling, uHAST, and HTRB - making SA48CH suitable for under-hood automotive applications including ECUs and body control modules.
Does the SA48CH have bidirectional capability?
No, the SA48CH is a unidirectional TVS diode. Its marking includes a cathode band, and its electrical specifications (e.g., VF = 3.5V @ 35A) apply only in forward conduction mode. Bidirectional variants in the SA Series carry "CA" or "C" suffixes (e.g., SA48CA); the "H" suffix in SA48CH confirms unidirectional AEC-Q101 qualification.
What is the maximum clamping voltage of the SA48CH under surge conditions?
The SA48CH has a maximum clamping voltage (VC) of 85.5 V at 6.1 A peak pulse current (IPPM), measured under the standardized 10/1000μs double-exponential surge waveform. This value is guaranteed across the operating temperature range and defines the upper voltage limit imposed on protected circuitry during transient events.
Can the SA48CH be used in 42V automotive systems?
Yes, the SA48CH is specifically suited for 42V mild-hybrid automotive systems. Its 48V working stand-off voltage (VWM) provides sufficient margin above the 42V nominal rail, while its 53.3–65.2V breakdown range ensures reliable avalanche conduction only during actual overvoltage events - preventing nuisance triggering during normal operation or cold-crank conditions.
What is the thermal derating behavior of the SA48CH above 25°C ambient?
The SA48CH's peak pulse power (PPK) is derated linearly above TA = 25°C per Figure 2 in the datasheet: at 75°C ambient, PPK drops to ~350W, and at 125°C, it falls to ~175W. Steady-state power dissipation (PD) is rated at 3W at TL = 75°C with 9.5mm lead lengths mounted on 10×10 mm copper pads - critical for thermal design in enclosed engine-bay enclosures.
SA48CH 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:
- 85.5V
- Current - Peak Pulse (10/1000µs):
- 6.1A
- 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)
SA48CH FAQ
1.How can I place an order for SA48CH through Aetrix?
Please submit a Request for Quotation (RFQ) for SA48CH 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 SA48CH reliable?
The price and inventory of SA48CH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA48CH is usually 5 days.
3.What payment methods are accepted for SA48CH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA48CH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA48CH?
SA48CH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA48CH 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 SA48CH?
For technical support, including SA48CH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA48CH requirements.
6.How does Aetrix verify that SA48CH is sourced from the original manufacturer or authorized distributors?
All SA48CH 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 SA48CH meets industry standards.
7.What is the process for return or replacement of SA48CH?
All SA48CH units undergo pre-shipment inspection (PSI). If there is an issue with SA48CH, 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 SA48CH part is unused and in its original packaging.
Return procedure for SA48CH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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