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Taiwan Semiconductor Corporation SMAJ48CH
- Part No.:
- SMAJ48CH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ48CH.pdf
- Description:
- TVS DIODE 48VWM 85.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,134
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Product details
Overview
SMAJ48CH from Taiwan Semiconductor is a unidirectional 48 V standoff, 53.3–65.1 V breakdown, 400 W peak pulse power (10/1000 µs) transient voltage suppressor in DO-214AC (SMA) package, designed for automotive-grade overvoltage protection in DC/DC converters and SMPS input stages.
For engineers reviewing the SMAJ48CH datasheet, SMAJ48CH pinout, SMAJ48CH application, or SMAJ48CH equivalent, key selection criteria include clamping voltage (≤85.5 V at 4.7 A), AEC-Q101 qualification, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, and moisture sensitivity level 1 handling.
Technical Context
The SMAJ48CH employs a glass-passivated silicon junction optimized for fast response (<1.0 ps from 0 V to VBR min) and low leakage (<1 µA at 48 V). Its unidirectional configuration provides asymmetric clamping with forward conduction capability up to 40 A IFSM.
It operates across –55 °C to +150 °C junction temperature range and delivers 400 W peak pulse power at TA = 25 °C, derating linearly above that ambient per Fig.2. The device meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 48 V - Maximum continuous reverse operating voltage before significant leakage begins |
| VBR @ IT = 1 mA | 53.3–65.1 V - Breakdown voltage range confirming robust turn-on threshold under standardized test current |
| VC @ IPPM = 4.7 A | 85.5 V - Clamped voltage during 10/1000 µs surge, defining maximum protected-circuit stress |
| PPPM | 400 W - Peak pulse power handling capacity, enabling protection against high-energy transients |
| IR @ VWM | <1 µA - Ultra-low reverse leakage ensuring minimal standby power loss in high-impedance circuits |
| TJ max | +150 °C - Maximum junction temperature supporting operation in under-hood automotive environments |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, single-die unidirectional TVS diode with cathode band marking. Matte tin-plated leads, RoHS and halogen-free compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (non-banded end) | Forward current entry / Reverse voltage reference | Connects to lower-potential side of protected line; defines polarity-sensitive clamping direction |
| Cathode (banded end) | Clamping output / Surge current sink | Connected to system ground or return path; carries full transient current during overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics use including engine control, body modules, and ADAS power rails |
| ISO 7637-2 compliance (Pulse 1/2a/2b/3a/3b) | Guarantees immunity to real-world vehicle electrical disturbances without external filtering |
| Fast response time <1.0 ps | Enables clamping before sensitive downstream ICs experience damaging voltage overshoot |
| Moisture sensitivity level 1 (J-STD-020) | Eliminates bake-out requirement prior to reflow, reducing manufacturing cost and risk |
| Glass passivated junction | Ensures long-term reliability and stable electrical characteristics under thermal cycling and humidity |
Applications
| Automotive On-Board Charger Input | Industrial SMPS Primary Side |
|---|---|
Use Scenario: Protecting AC-DC front-end rectifier outputs against load dump and alternator transients in 48 V EV/HEV charging systems. IC Role / Device Role / Timing Role: Unidirectional TVS clamp absorbing 400 W pulses while limiting voltage to ≤85.5 V. Use Value: Prevents MOSFET gate oxide rupture and controller IC latch-up during ISO 7637-2 Pulse 5a events. |
Use Scenario: Safeguarding flyback converter primary switches against reflected surge energy from output short-circuits or lightning-induced coupling. IC Role / Device Role / Timing Role: Fast-response transient suppressor placed across bulk capacitor or switch drain-source. Use Value: Maintains <1 µA leakage at 48 V stand-off, minimizing no-load power loss without compromising surge margin. |
| LED Driver Power Input | Telecom DC Power Interface |
Use Scenario: Shielding constant-current LED driver ICs from inductive kickback and ESD in streetlight and signage applications. IC Role / Device Role / Timing Role: Standoff-rated TVS absorbing repetitive 10/1000 µs surges up to 400 W without degradation. Use Value: Enables >150,000 surge cycles per JESD22-A114E testing due to stable glass-passivated junction. |
Use Scenario: Front-end protection on -48 V telecom power distribution boards exposed to accidental hot-swap and cable discharge events. IC Role / Device Role / Timing Role: Unidirectional clamp referenced to system ground, suppressing positive-going transients only. Use Value: Delivers 85.5 V clamping at 4.7 A while occupying only 2.5 mm × 4.3 mm footprint (DO-214AC). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ48A | Lower VBR range (53.3–58.9 V) and higher clamping (77.4 V at 5.2 A); same package and rating | Better suited for tighter voltage margin designs where lower clamping overshoot is critical | Select SMAJ48A when system tolerance allows reduced VBR spread and lower VC is prioritized over absolute peak power margin |
| SMBJ48CH | Same VWM/VBR/VC specs but in larger DO-214AA (SMB) package; 600 W PPPM | Higher power handling supports longer-duration transients; requires larger PCB area | Choose SMBJ48CH only if design requires >400 W pulse capability or legacy SMB footprint compatibility |
Compared with SMAJ48A and SMBJ48CH, the SMAJ48CH offers optimal balance of compact DO-214AC footprint, AEC-Q101 qualification, and 400 W surge capacity-making it ideal for space-constrained automotive and industrial DC/DC modules where both reliability and layout efficiency are critical.
Availability
SMAJ48CH is available at Aetrix Electronics and suitable for automotive power management, industrial SMPS, LED lighting drivers, and telecom DC interface applications requiring stable component supply and AEC-Q101-compliant surge protection.
Supply support for SMAJ48CH 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 high-reliability protection devices and power components.
The SMAJ series was developed specifically for automotive and industrial transient suppression, emphasizing AEC-Q101 qualification, ISO 7637-2 compliance, and robust glass-passivated junction performance under thermal stress.
FAQ
What is the clamping voltage of SMAJ48CH under standard 10/1000 µs surge conditions?
The SMAJ48CH has a maximum clamping voltage VC of 85.5 V at IPPM = 4.7 A for a 10/1000 µs waveform. This value is measured per JEDEC standards and ensures protected circuitry remains below critical voltage thresholds during surge events. The SMAJ48CH maintains this clamping performance across its full operating temperature range.
Is SMAJ48CH suitable for bidirectional transient protection?
No, SMAJ48CH is a unidirectional TVS diode, indicated by the "H" suffix and cathode band marking. For bidirectional protection, Taiwan Semiconductor specifies SMAJ48CH's counterpart SMAJ48CAH (with "CAH" suffix), which provides symmetrical clamping in both polarities. Using SMAJ48CH in reverse-biased configurations may result in unintended forward conduction.
Does SMAJ48CH meet automotive qualification standards?
Yes, SMAJ48CH is AEC-Q101 qualified and fully compliant with ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b test waveforms. It also meets JESD201 Class 2 whisker resistance and J-STD-020 moisture sensitivity level 1-making it suitable for under-hood and body-control module applications without additional screening.
What is the maximum steady-state power dissipation of SMAJ48CH?
The SMAJ48CH has a steady-state power dissipation (PD) rating of 1 W at TA = 25 °C. This value reflects continuous DC or low-frequency power handling capability-not surge-related. Actual thermal design must consider PCB copper area, ambient temperature, and derating curves per Figure 2 in the official datasheet for SMAJ48CH.
How does the marking code "CW" relate to SMAJ48CH?
"CW" is the official marking code printed on the SMAJ48CH device body per Taiwan Semiconductor's ordering documentation. It uniquely identifies the 48 V stand-off variant within the SMAJxH family and distinguishes it from adjacent variants like SMAJ45CH ("CU") or SMAJ51CH ("CY"). This marking enables visual verification during assembly and inspection of SMAJ48CH.
SMAJ48CH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AC, SMA
- Series:
- SMAJ
- 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):
- 4.7A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ48CH FAQ
1.How can I place an order for SMAJ48CH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ48CH 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 SMAJ48CH reliable?
The price and inventory of SMAJ48CH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ48CH is usually 5 days.
3.What payment methods are accepted for SMAJ48CH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ48CH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ48CH?
SMAJ48CH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ48CH 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 SMAJ48CH?
For technical support, including SMAJ48CH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ48CH requirements.
6.How does Aetrix verify that SMAJ48CH is sourced from the original manufacturer or authorized distributors?
All SMAJ48CH 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 SMAJ48CH meets industry standards.
7.What is the process for return or replacement of SMAJ48CH?
All SMAJ48CH units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ48CH, 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 SMAJ48CH part is unused and in its original packaging.
Return procedure for SMAJ48CH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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