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Taiwan Semiconductor Corporation SMAJ5.0
- Part No.:
- SMAJ5.0
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ5.0.pdf
- Description:
- 400W, 6.9V, 10%, UNIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:6,550
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Product details
Overview
SMAJ5.0 from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for primary overvoltage protection in DC power rails. It features a 5.0 V working stand-off voltage (VWM), 6.4–7.3 V breakdown voltage (VBR), 41.7 V clamping voltage (VC) at 800 A peak pulse current, and 400 W peak pulse power rating with 10/1000 µs waveform - deployed in switching mode power supplies and on-board DC/DC converters.
For engineers reviewing the SMAJ5.0 datasheet, SMAJ5.0 pinout, SMAJ5.0 application, or SMAJ5.0 equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, low leakage (<5 µA at 10 V), fast response (<1.0 ps), and DO-214AC (SMA) package compatibility with automated placement and J-STD-002 solderability.
Technical Context
The SMAJ5.0 operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its specified breakdown range (6.4–7.3 V at 10 mA test current). Its glass-passivated junction ensures stable VBR tolerance and low leakage, while its 400 W peak pulse power rating applies strictly to 10/1000 µs waveform at TA = 25°C and derates linearly above that temperature per Fig.2.
Designed for single-die, cathode-banded configuration in DO-214AC (SMA) package, the SMAJ5.0 supports polarity-sensitive placement and meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements. It is not rated for bidirectional use - SMAJ5.0A is the bidirectional variant with identical VWM but lower VC (43.5 V) and tighter VBR (6.4–7.0 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 5.0 V - maximum continuous reverse operating voltage before conduction begins |
| VBR min/max | 6.4 V / 7.3 V at 10 mA - guaranteed avalanche initiation window defining turn-on threshold |
| VC @ IPPM | 41.7 V at 800 A - clamped voltage during 10/1000 µs surge, limiting downstream stress |
| PPPM | 400 W - peak pulse power handling with 10/1000 µs waveform, critical for automotive load dump immunity |
| IR @ VWM | <5 µA - minimal leakage at rated stand-off, preserving efficiency in low-power standby circuits |
| Package | DO-214AC (SMA) - industry-standard surface-mount outline with 0.060 g mass and J-STD-002 solderable matte tin leads |
| TJ max | +150 °C - maximum junction temperature enabling operation in high-ambient industrial environments |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with cathode band marking; anode and cathode terminals aligned along body axis; lead finish: matte tin; moisture sensitivity level 1 per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Current entry point in forward bias; connected to system ground or low-side rail | Completes conduction path during transient clamp; must be routed with low-inductance trace to minimize overshoot |
| Cathode (banded end) | Current exit point in reverse bias; connected to protected line (e.g., +5V rail) | Defines polarity-sensitive protection direction; incorrect orientation disables clamping function |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance and long-term reliability under repeated surge stress without parameter drift |
| Clamping voltage ≤41.7 V at 800 A | Protects 5 V logic and power ICs (e.g., LDOs, microcontrollers) by limiting surge-induced overvoltage below damage thresholds |
| Response time <1.0 ps | Engages before most ESD or fast transients propagate through PCB traces, minimizing unprotected exposure time |
| ISO 7637-2 compliance (Pulse 1/2a/2b/3a/3b) | Validated for automotive 12 V system immunity including battery disconnect, inductive load dump, and supply reversal events |
| RoHS & halogen-free | Meets IEC 61249-2-21 and EU RoHS Directive for environmentally compliant manufacturing and end-of-life processing |
Applications
| Switching Mode Power Supply (SMPS) | On-board DC/DC Converter |
|---|---|
Use Scenario: Input stage of AC/DC adapter or isolated flyback converter subjected to line surges and lightning-induced transients. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed across input bulk capacitor or rectifier output. Use Value: Limits transient voltage to ≤41.7 V, preventing breakdown of 60 V-rated MOSFETs and electrolytic capacitors rated for 50 V DC. | Use Scenario: 12 V-to-5 V buck converter powering microcontroller peripherals in automotive body control modules. IC Role / Device Role / Timing Role: Unidirectional TVS on 5 V output rail to absorb coupled noise from adjacent high-current solenoid drivers. Use Value: Clamps sub-microsecond spikes from nearby switching nodes, maintaining <5 µA leakage to avoid quiescent current budget violations. |
| Lighting Application | Adapter Protection |
Use Scenario: LED driver board in commercial downlight fixture exposed to mains-borne surges during grid switching. IC Role / Device Role / Timing Role: Standoff protection on constant-current regulator input, placed upstream of EMI filter. Use Value: Withstands 400 W pulses without degradation, ensuring >100,000 surge cycles per IEC 61000-4-5 Level 3 compliance. | Use Scenario: USB-C PD adapter secondary-side output subjected to hot-plug ESD and cable discharge events. IC Role / Device Role / Timing Role: Final-stage TVS on 5 V VBUS line, positioned immediately before connector to minimize trace inductance. Use Value: Sub-1 ps response captures fast ESD events before they reach USB controller ICs, with cathode-band orientation ensuring correct polarity alignment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ5.0A | Bidirectional variant; same VWM (5.0 V), tighter VBR (6.4–7.0 V), higher VC (43.5 V), identical 400 W rating | Required where AC-coupled or polarity-agnostic protection is needed (e.g., data lines, dual-rail sensors) | Select SMAJ5.0A only if bidirectional clamping is mandated; SMAJ5.0 provides lower VC and better efficiency for DC rail protection. |
| SMBJ5.0 | Same electrical specs but in larger DO-214AA (SMB) package; 600 W peak power rating (vs. 400 W); 0.110 g mass vs. 0.060 g | Preferred in high-energy industrial environments requiring greater thermal margin and mechanical robustness | Choose SMBJ5.0 when layout allows larger footprint and higher surge energy (e.g., factory automation PLC I/O modules). |
Compared with SMAJ5.0A and SMBJ5.0, the SMAJ5.0 delivers optimal clamping voltage (41.7 V) and smallest footprint (DO-214AC) for space-constrained 5 V DC rail protection, while avoiding unnecessary bidirectional overhead or oversized thermal mass.
Availability
SMAJ5.0 is available at Aetrix Electronics and suitable for switching mode power supplies, on-board DC/DC converters, lighting applications, and adapter protection requiring stable component supply with full traceability and lifecycle management.
Supply support for SMAJ5.0 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.
The SMAJ series was developed specifically for high-reliability, surface-mount transient suppression in automotive and industrial power systems, emphasizing low clamping voltage, fast response, and AEC-Q200-aligned robustness.
FAQ
What is the maximum clamping voltage of the SMAJ5.0 under standard test conditions?
The SMAJ5.0 exhibits a maximum clamping voltage (VC) of 41.7 V when subjected to an 800 A peak impulse current with a 10/1000 µs waveform at TA = 25°C. This value is measured across the device terminals during surge conduction and defines the upper voltage limit imposed on protected circuitry - critical for ensuring compatibility with 5 V logic-level components and power ICs rated for ≤45 V absolute maximum.
Is the SMAJ5.0 suitable for automotive applications requiring ISO 7637-2 compliance?
Yes, the SMAJ5.0 is explicitly rated to meet ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b test requirements for 12 V automotive electrical systems. Its 400 W peak pulse power rating, fast <1.0 ps response, and guaranteed clamping behavior under standardized load dump and supply interruption waveforms make it appropriate for protecting ECUs, body controllers, and lighting modules in passenger vehicles and commercial fleets.
How does the SMAJ5.0 differ from the SMAJ5.0A variant?
The SMAJ5.0 is unidirectional, with cathode band marking and optimized clamping (41.7 V) for DC rail protection. The SMAJ5.0A is bidirectional, offering symmetrical clamping in both polarities (VC = 43.5 V), same VWM (5.0 V), and tighter VBR (6.4–7.0 V). SMAJ5.0A is required for AC signal lines or polarity-unknown inputs; SMAJ5.0 provides superior DC efficiency and lower clamping for dedicated +5 V rail use.
What is the operating temperature range for the SMAJ5.0?
The SMAJ5.0 is rated for an operating junction temperature range of –55 °C to +150 °C, with steady-state power dissipation (PD) of 1 W and peak pulse power (PPK) of 400 W at TA = 25°C. Derating curves (Fig.2) specify linear reduction of PPK above 25°C ambient, enabling reliable deployment in under-hood automotive, industrial motor drives, and outdoor lighting enclosures without thermal runaway risk.
Does the SMAJ5.0 require special PCB layout considerations?
Yes - to preserve its <1.0 ps response and low clamping voltage, the SMAJ5.0 must be placed with minimal trace length between cathode and protected node, and anode tied directly to low-impedance ground plane. Avoid vias or daisy-chained grounds; use dedicated thermal pads per DO-214AC footprint; maintain ≥0.5 mm clearance from high-voltage traces; and orient cathode band toward the line being protected to ensure correct unidirectional operation.
SMAJ5.0 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:
- 1
- Bidirectional Channels:
- -
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ5.0 FAQ
1.How can I place an order for SMAJ5.0 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ5.0 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 SMAJ5.0 reliable?
The price and inventory of SMAJ5.0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ5.0 is usually 5 days.
3.What payment methods are accepted for SMAJ5.0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ5.0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ5.0?
SMAJ5.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ5.0 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 SMAJ5.0?
For technical support, including SMAJ5.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ5.0 requirements.
6.How does Aetrix verify that SMAJ5.0 is sourced from the original manufacturer or authorized distributors?
All SMAJ5.0 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 SMAJ5.0 meets industry standards.
7.What is the process for return or replacement of SMAJ5.0?
All SMAJ5.0 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ5.0, 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 SMAJ5.0 part is unused and in its original packaging.
Return procedure for SMAJ5.0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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