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Taiwan Semiconductor Corporation SMA6J20A
- Part No.:
- SMA6J20A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA6J20A.pdf
- Description:
- TVS DIODE 20VWM 31.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,219
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Product details
Overview
SMA6J20A from Taiwan Semiconductor is a 600W surface-mount transient voltage suppressor (TVS) diode with a 20V working standoff voltage, 22.2–24.5V breakdown range at 1mA, and 31.4V clamping voltage at 19.1A peak pulse current; designed for automotive and industrial DC/DC converter protection against ISO 7637-2 transients.
For engineers reviewing the SMA6J20A datasheet, SMA6J20A pinout, SMA6J20A application, or SMA6J20A equivalent, key selection criteria include clamping performance under 10/1000μs surge, DO-214AC (SMA) package compatibility with automated SMT lines, moisture sensitivity level 1 handling, and compliance with ISO 7637-2 Pulse 1/2a/2b/3a/3b requirements.
Technical Context
This unidirectional TVS diode uses a glass-passivated silicon junction to achieve sub-1ps response time and robust clamping during fast-rising transients. Its single-die DO-214AC configuration supports reverse-biased operation with cathode-band polarity marking and meets JESD201 Class 2 whisker resistance.
The device operates across –55°C to +175°C junction temperature, dissipates up to 4W continuously, and withstands 50A non-repetitive forward surge (8.3ms half-sine). Clamping voltage remains stable at ≤31.4V up to 19.1A IPPM per 10/1000μs waveform.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - Maximum continuous reverse operating voltage before leakage exceeds 1 µA |
| VBR min/max | 22.2 V / 24.5 V at IT = 1 mA - Confirmed breakdown threshold for reliable turn-on during overvoltage events |
| VC @ IPPM | 31.4 V at 19.1 A - Peak clamped voltage limiting downstream circuit stress during 10/1000µs surge |
| PPPM | 600 W - Surge power handling capability defined by standard 10/1000µs waveform |
| TJ max | +175 °C - Enables use in high-temperature engine bay or power supply environments |
| MSL | Level 1 - No floor life limitation; safe for reflow without dry-pack or baking |
Pinout & Package
DO-214AC (SMA) surface-mount package with cathode-indicating band; matte tin-plated leads compliant with J-STD-002 solderability and UL 94V-0 molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / transient return path | Connected to ground or low-impedance return in unidirectional clamp configuration |
| Cathode | Protected line connection / surge input | Connected to line being protected (e.g., 24V rail); marked by visible band |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR and low leakage (<1 µA) over lifetime and temperature cycling |
| Sub-1 ps response time | Enables suppression of ESD and fast-switching noise before sensitive ICs are damaged |
| ISO 7637-2 compliance | Validated for automotive load dump and inductive switching transients (Pulse 1/2a/2b/3a/3b) |
| Halogen-free & RoHS | Meets IEC 61249-2-21 and EU RoHS Directive for environmentally constrained designs |
Applications
| Automotive Power Distribution | Industrial DC/DC Converters |
|---|---|
Use Scenario: Protection of 24V battery-fed ECUs against load dump and alternator transients per ISO 7637-2 Pulse 5a. IC Role / Device Role / Timing Role: Unidirectional TVS clamping element placed at input filter stage. Use Value: Limits voltage to ≤31.4V during 600W surges, preventing damage to upstream regulators and microcontrollers. | Use Scenario: Input rail protection in isolated 48V-to-12V industrial DC/DC modules exposed to switching noise and coupling transients. IC Role / Device Role / Timing Role: Primary transient shunt on primary-side HV input bus. Use Value: Maintains system uptime by absorbing repetitive 10/1000µs pulses without degradation or thermal runaway. |
| LED Driver Power Stages | Telecom Power Interfaces |
Use Scenario: Surge protection for constant-current LED drivers in streetlight systems subject to lightning-induced surges. IC Role / Device Role / Timing Role: Line-to-ground TVS on DC input prior to buck controller. Use Value: Withstands ≥19.1A peak current while holding clamping voltage below MOSFET drain-source rating. | Use Scenario: Secondary-side 24V interface protection in PoE-powered telecom equipment exposed to induced surges on long cable runs. IC Role / Device Role / Timing Role: Reverse-biased transient suppressor on powered device (PD) input rail. Use Value: Provides MSL Level 1 handling for high-volume automated assembly without moisture-related popcorning risk. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA6J20CA | Bidirectional variant; symmetric clamping for AC-coupled or floating rails | Required where differential-mode transients or bidirectional signal lines need protection | Select SMA6J20CA only if circuit lacks defined ground reference or handles AC signals |
| SMB6J20A | Larger DO-214AA (SMB) package; 1.0W higher steady-state power rating (5W vs. 4W) | Preferred in thermally constrained layouts where DO-214AC footprint is insufficient for heat dissipation | Choose SMB6J20A when board-level thermal resistance exceeds 40°C/W and derating is critical |
Compared with SMA6J20A, SMA6J20CA adds bidirectional clamping at the cost of higher capacitance and reduced DC bias margin, while SMB6J20A trades smaller footprint for improved thermal performance-neither is pin-compatible, requiring layout revision.
Availability
SMA6J20A is available at Aetrix Electronics and suitable for automotive power distribution, industrial DC/DC converters, LED driver power stages, and telecom power interfaces requiring stable component supply and full traceability.
Supply support for SMA6J20A 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, serving automotive, industrial, and consumer markets since 1979.
The SMA6JxxA series is part of TSC's transient protection portfolio, engineered specifically for high-reliability, high-surge-capacity surface-mount TVS applications in harsh electromagnetic environments.
FAQ
What is the maximum clamping voltage of the SMA6J20A under standard test conditions?
The SMA6J20A exhibits a maximum clamping voltage (VC) of 31.4 V when subjected to its rated peak pulse current of 19.1 A using the 10/1000 µs waveform. This value is measured at TA = 25°C and defines the upper voltage limit imposed on protected circuits during surge events. The SMA6J20A maintains this clamping performance consistently across its specified operating temperature range.
Does the SMA6J20A meet automotive transient immunity standards?
Yes, the SMA6J20A is explicitly validated to meet ISO 7637-2 requirements for Pulses 1, 2a, 2b, 3a, and 3b-covering common automotive electrical disturbances including load dump, supply interruption, and inductive switching transients. This compliance is documented in Taiwan Semiconductor's official datasheet Version E2102 and confirmed through standardized test waveforms.
What is the moisture sensitivity level (MSL) rating for the SMA6J20A?
The SMA6J20A carries an MSL rating of Level 1 per J-STD-020, meaning it has no floor life limitation and may be stored indefinitely at ambient conditions without dry-packaging or baking prior to reflow soldering. This simplifies manufacturing logistics and eliminates moisture-related yield loss during SMT assembly.
How does the SMA6J20A differ from the SMA6J20CA?
The SMA6J20A is unidirectional, optimized for DC rail protection with cathode-to-line orientation, whereas the SMA6J20CA is bidirectional and symmetrical-suitable for AC-coupled or floating signal paths. Their VBR and VC values differ slightly due to internal structure, and they are not interchangeable without circuit review. Both share the same DO-214AC package and 600W PPPM rating.
What is the steady-state power dissipation rating for the SMA6J20A?
The SMA6J20A has a steady-state power dissipation (PD) rating of 4 W at TA = 25°C. This value reflects continuous DC or low-frequency power handling capability and must be derated linearly above 25°C ambient per the pulse derating curve in the datasheet. It is distinct from its 600W peak pulse rating, which applies only to short-duration transients.
SMA6J20A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AC, SMA
- Series:
- SMA6J
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 20V
- Voltage - Breakdown (Min):
- 22.2V
- Voltage - Clamping (Max) @ Ipp:
- 31.4V
- Current - Peak Pulse (10/1000µs):
- 19.1A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMA6J20A FAQ
1.How can I place an order for SMA6J20A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA6J20A 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 SMA6J20A reliable?
The price and inventory of SMA6J20A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA6J20A is usually 5 days.
3.What payment methods are accepted for SMA6J20A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA6J20A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA6J20A?
SMA6J20A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA6J20A 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 SMA6J20A?
For technical support, including SMA6J20A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA6J20A requirements.
6.How does Aetrix verify that SMA6J20A is sourced from the original manufacturer or authorized distributors?
All SMA6J20A 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 SMA6J20A meets industry standards.
7.What is the process for return or replacement of SMA6J20A?
All SMA6J20A units undergo pre-shipment inspection (PSI). If there is an issue with SMA6J20A, 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 SMA6J20A part is unused and in its original packaging.
Return procedure for SMA6J20A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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