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Taiwan Semiconductor Corporation SMAJ5.0CH
- Part No.:
- SMAJ5.0CH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ5.0CH.pdf
- Description:
- 400W, 6.9V, BIDIRECTIONAL, TVS
- Quantity:
- Payment:
- Shipping:
Inventory:8,530
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Product details
Overview
SMAJ5.0CH from Taiwan Semiconductor is a unidirectional 400W surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, with 5.0V working stand-off voltage (VWM), 6.4–7.3V breakdown voltage (VBR), and 41.7V clamping voltage (VC) at 800A peak pulse current under 10/1000μs waveform - designed for automotive-grade DC/DC converter input protection per ISO 7637-2 Pulse 1/2a/2b/3a/3b.
For engineers reviewing the SMAJ5.0CH datasheet, SMAJ5.0CH pinout, SMAJ5.0CH application, or SMAJ5.0CH equivalent, this part supports AEC-Q101 qualified designs requiring sub-1ps response time, <1μA reverse leakage above 10V, glass-passivated junction reliability, and UL 94V-0 compliant molding compound in high-volume automated placement.
Technical Context
The SMAJ5.0CH operates as a unidirectional avalanche-clamping TVS diode, triggered when reverse voltage exceeds its 6.4–7.3V breakdown range at 10mA test current. Its clamping action limits transients to ≤41.7V at 800A, enabling robust protection of 5V-rail power inputs against ESD, load dump, and inductive switching spikes.
It features a single-die DO-214AC (SMA) construction with cathode band polarity marking, rated for -55°C to +150°C junction operation, 1W steady-state dissipation, and 40A non-repetitive forward surge capability - meeting JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 5.0 V - Maximum continuous reverse operating voltage before clamping begins; matches standard 5V logic/power rail systems. |
| VBR min/max | 6.4 V / 7.3 V at 10 mA - Confirmed avalanche initiation window ensures reliable triggering without premature conduction. |
| VC @ IPPM | 41.7 V at 800 A (10/1000μs) - Clamped voltage stays well below typical 5V IC absolute maximum ratings (e.g., 6–7V). |
| PPPM | 400 W - Peak pulse power rating enables suppression of high-energy transients common in automotive and industrial environments. |
| IR @ VWM | <5 μA - Ultra-low leakage preserves system efficiency and prevents false triggering in low-power standby modes. |
| Response time | <1.0 ps - Sub-picosecond junction response ensures clamping activation before sensitive downstream circuitry sustains damage. |
| TJ max | +150 °C - Extended thermal rating supports under-hood automotive deployment and high-ambient industrial applications. |
Pinout & Package
DO-214AC (SMA) surface-mount package with cathode band marking; matte tin-plated leads compliant with J-STD-002 solderability requirements and JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Transient return path | Connected to protected circuit ground or low-side reference; completes clamping loop during overvoltage events. |
| Cathode | Reverse-biased clamping node | Connected to protected 5V rail; conducts avalanche current when Vreverse > VBR, diverting surge energy to ground. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive electronics use including engine control units, body modules, and ADAS power supplies. |
| Glass-passivated junction | Enhances long-term reliability and stability under thermal cycling and humidity exposure versus epoxy-passivated alternatives. |
| ISO 7637-2 compliance | Meets Pulse 1 (inductive load disconnect), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling) immunity requirements. |
| UL 94V-0 molding compound | Self-extinguishing encapsulation prevents flame propagation in safety-critical board-level assemblies. |
| Halogen-free (IEC 61249-2-21) | Complies with RoHS and environmental regulations while maintaining dielectric strength and thermal performance. |
Applications
| Automotive On-Board DC/DC Converter Input Protection | Industrial SMPS Secondary-Side Overvoltage Clamp |
|---|---|
|
Use Scenario: Protecting 5V output stage of a buck converter supplying microcontroller and sensor rails in an automotive body control module. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 5V output and ground to clamp load dump and back-EMF transients. Use Value: Limits voltage excursions to ≤41.7V during 800A pulses, preventing latch-up or permanent damage to 5V-rated CAN transceivers and MCU I/O. |
Use Scenario: Safeguarding secondary-side rectifier and filter capacitors in a 24V-to-5V isolated flyback supply used in factory automation PLCs. IC Role / Device Role / Timing Role: Fast-response clamping device absorbing repetitive switching spikes and line-induced surges on the regulated 5V bus. Use Value: With <1μA leakage at 5V, it avoids loading the regulation loop; sub-1ps response ensures clamping precedes regulator error amplifier reaction time. |
| LED Driver Power Input Surge Suppression | USB-C PD Adapter 5V Output Rail Protection |
|
Use Scenario: Securing constant-current LED driver IC inputs against ESD and hot-plug transients in outdoor lighting fixtures exposed to lightning-induced coupling. IC Role / Device Role / Timing Role: Primary transient shunt on the 5V bias rail feeding gate drivers and current-sense amplifiers. Use Value: 400W peak power rating handles multi-kV ESD events per IEC 61000-4-2; DO-214AC footprint allows compact layout near connector entry points. |
Use Scenario: Adding secondary-stage surge immunity to the 5V USB Power Delivery output of a universal wall adapter after primary-side isolation. IC Role / Device Role / Timing Role: Final-line defense TVS on the USB-C VBUS line, positioned downstream of the PD controller and load switch. Use Value: Clamps to 41.7V within picoseconds, ensuring compliance with USB-IF VBUS tolerance limits (5.5V max for 5V mode) via coordinated system-level design. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ5.0AH | Lower VBR range (6.4–7.0V vs. 6.4–7.3V); identical VWM, VC, and PPPM ratings. | Same 5V rail protection use case; tighter VBR tolerance may reduce margin for marginal overvoltage conditions. | Select SMAJ5.0AH where tighter breakdown consistency is required; SMAJ5.0CH offers broader VBR distribution for higher production yield. |
| SMBJ5.0A | DO-214AA (SMB) package; 600W PPPM (10/1000μs); VBR 6.4–7.0V; VC 9.2V at 65A (lower clamping but lower surge capacity). | Better clamping performance at lower currents; unsuitable for 800A-level transients due to smaller package thermal mass. | Choose SMBJ5.0A only for space-constrained 5V rails with <100A expected surge; SMAJ5.0CH remains preferred for full ISO 7637-2 Pulse 5a compliance. |
Compared with SMAJ5.0AH and SMBJ5.0A, the SMAJ5.0CH delivers optimal balance of high-energy surge handling (400W/800A), automotive qualification, and DO-214AC manufacturability - making it the default choice for AEC-Q101-compliant 5V system protection where clamping voltage margin and thermal robustness are critical.
Availability
SMAJ5.0CH is available at Aetrix Electronics and suitable for automotive body electronics, industrial SMPS, LED driver power stages, and USB-C PD adapter designs requiring stable component supply across extended temperature ranges and high-reliability production programs.
Supply support for SMAJ5.0CH 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, MOSFETs, and power management devices since 1979.
The SMAJ series was developed specifically for AEC-Q101-compliant automotive and industrial transient suppression, emphasizing fast response, high surge robustness, and process-controlled glass passivation for long-term reliability in harsh environments.
FAQ
What is the polarity configuration of the SMAJ5.0CH?
The SMAJ5.0CH is a unidirectional TVS diode with cathode band marking indicating the cathode terminal. It conducts in reverse bias during overvoltage events and blocks forward current up to 3.5V at 25A. This configuration makes it suitable for protecting positive 5V rails referenced to ground, unlike bidirectional variants such as SMAJ5.0CH-BI or SMAJ5.0CAH.
Does the SMAJ5.0CH meet AEC-Q101 stress test requirements?
Yes, the SMAJ5.0CH is explicitly qualified to AEC-Q101 standards, including high-temperature operating life (HTOL), temperature cycling, mechanical shock, and humidity testing. Its glass-passivated junction and DO-214AC package construction were validated per the full AEC-Q101-003 and AEC-Q101-004 test plans for discrete semiconductors.
What is the maximum clamping voltage of the SMAJ5.0CH under standardized surge conditions?
The SMAJ5.0CH clamps to a maximum of 41.7V at 800A peak pulse current under the 10/1000μs waveform defined by R.E.A. and IEC 61000-4-5. This value is guaranteed across the full operating temperature range (-55°C to +150°C) and represents the upper limit of voltage seen by protected circuitry during worst-case transient events.
Can the SMAJ5.0CH be used in bidirectional signal line protection?
No, the SMAJ5.0CH is strictly unidirectional and must not be used on AC or bidirectional signal lines. For bidirectional applications such as RS-485 or CAN bus protection, select the SMAJ5.0CAH variant (with CAH suffix), which provides symmetrical clamping in both directions and is rated for ±5.0V working stand-off.
What packaging and reel quantity is offered for the SMAJ5.0CH?
The SMAJ5.0CH is supplied in DO-214AC (SMA) package on 7,500-piece tape-and-reel format per industry standard. The reel complies with EIA-481-D specifications and includes J-STD-020 Level 1 moisture sensitivity labeling, enabling immediate placement without baking for most SMT processes.
SMAJ5.0CH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AC, SMA
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 5V
- Voltage - Breakdown (Min):
- 6.4V
- Voltage - Clamping (Max) @ Ipp:
- 9.6V
- Current - Peak Pulse (10/1000µs):
- 41.7A
- 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)
SMAJ5.0CH FAQ
1.How can I place an order for SMAJ5.0CH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ5.0CH 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 SMAJ5.0CH reliable?
The price and inventory of SMAJ5.0CH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ5.0CH is usually 5 days.
3.What payment methods are accepted for SMAJ5.0CH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ5.0CH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ5.0CH?
SMAJ5.0CH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ5.0CH 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 SMAJ5.0CH?
For technical support, including SMAJ5.0CH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ5.0CH requirements.
6.How does Aetrix verify that SMAJ5.0CH is sourced from the original manufacturer or authorized distributors?
All SMAJ5.0CH 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 SMAJ5.0CH meets industry standards.
7.What is the process for return or replacement of SMAJ5.0CH?
All SMAJ5.0CH units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ5.0CH, 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 SMAJ5.0CH part is unused and in its original packaging.
Return procedure for SMAJ5.0CH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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