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Taiwan Semiconductor Corporation SMA6J18A R3G
- Part No.:
- SMA6J18A R3G
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA6J18A R3G.pdf
- Description:
- TVS DIODE 18VWM 28.3VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,198
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Product details
Overview
SMA6J18A R3G from Taiwan Semiconductor is a 600W surface-mount transient voltage suppressor (TVS) diode with a working standoff voltage of 18 V, breakdown voltage range 20–22.1 V, and clamping voltage of 28.3 V at 1.0 A peak pulse current; used for surge protection in DC/DC converters and automotive power modules.
For engineers reviewing the SMA6J18A R3G datasheet, SMA6J18A R3G pinout, SMA6J18A R3G application, or SMA6J18A R3G equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, DO-214AC package compatibility, junction temperature range (−55°C to +175°C), and 1.0 ps typical response time.
Technical Context
This unidirectional TVS diode employs a glass-passivated silicon junction optimized for fast transient suppression in automotive and industrial power rails. It delivers 600 W peak pulse power (10/1000 μs waveform) with a maximum clamping voltage of 28.3 V at 1.0 A IPPM and exhibits <1.0 ps response time.
Designed for compliance with ISO 7637-2 (Pulse 1, 2a, 2b, 3a, 3b), it supports operation across −55°C to +175°C junction temperature and features matte tin-plated leads compliant with J-STD-002 solderability and JESD 201 Class 2 whisker resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse operating voltage before conduction begins |
| VBR @ IT=1 mA | 20–22.1 V - Breakdown voltage range ensuring reliable turn-on during transients |
| VC @ IPPM=1.0 A | 28.3 V - Clamping voltage limiting downstream circuit stress during 10/1000 μs surge |
| PPPM | 600 W - Peak pulse power handling capability per standard 10/1000 μs waveform |
| TJ Range | −55°C to +175°C - Extended thermal operating envelope for under-hood and industrial environments |
| Response Time | <1.0 ps - Enables suppression of ultrafast ESD and switching-induced transients |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, single-diode configuration with cathode indicated by molded band. Weight: 0.060 g. Molding compound meets UL 94V-0.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / low-side reference | Connected to ground or lower-potential rail in unidirectional clamp configuration |
| Cathode | Reverse-biased terminal / high-side connection | Connected to protected line (e.g., 12 V rail); polarity band identifies this terminal |
Key Features
| Feature | Design Value |
|---|---|
| ISO 7637-2 compliance | Validated for Pulse 1, 2a, 2b, 3a, and 3b - enables direct use in automotive power supply designs without additional filtering |
| Glass-passivated junction | Enhances long-term reliability and stability of VBR under thermal cycling and humidity exposure |
| Moisture sensitivity level 1 | Eliminates need for dry-pack or baking prior to reflow - supports standard SMT assembly flow |
| Halogen-free construction | Meets IEC 61249-2-21 - satisfies environmental compliance requirements for RoHS and green manufacturing |
Applications
| Automotive Power Distribution | Industrial DC/DC Converters |
|---|---|
Use Scenario: Protection of 12 V battery-fed ECUs against load dump and alternator transients per ISO 7637-2. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed across input rail to clamp surges before they reach regulator ICs. Use Value: Limits clamped voltage to 28.3 V at 1.0 A, preventing damage to downstream 36 V-rated regulators and microcontrollers. | Use Scenario: Input surge suppression in isolated 24 V-to-5 V DC/DC modules used in PLC I/O cards. IC Role / Device Role / Timing Role: Primary overvoltage protection device on primary-side input, coordinated with upstream fuse. Use Value: 600 W peak power rating handles repetitive 10/1000 μs pulses common in factory floor power disturbances. |
| LED Driver Power Stages | USB-C Power Delivery Adapters |
Use Scenario: Transient protection on constant-current LED string inputs exposed to hot-swap and cable coupling events. IC Role / Device Role / Timing Role: Standoff-rated TVS absorbing inductive kickback from driver MOSFETs and external ESD. Use Value: 18 V VWM allows full operation across 12–15 V nominal LED bus while clamping at 28.3 V to protect driver ICs. | Use Scenario: Secondary-side overvoltage clamp in 20 V USB PD adapter outputs during communication fault or sink disconnection. IC Role / Device Role / Timing Role: Fast-response unidirectional suppressor placed between output rail and ground to limit overshoot. Use Value: Sub-1 ps response ensures clamping before 5 V logic-level controllers or USB interface ICs experience overstress. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA6J18AHE3_A/H (Vishay) | Same DO-214AC package; VBR = 20–22.2 V, VC = 28.5 V @ 1.0 A - 0.2 V higher clamping | Identical ISO 7637-2 compliance; slightly higher clamping may affect margin in 3.3 V logic-coupled systems | Select when dual-sourcing required and 0.2 V clamping increase is acceptable within system OV threshold |
| P6SMB18A (ON Semiconductor) | DO-214AA (SMB) package; same VWM/VBR specs but 600 W rating at 10/1000 μs; 29.2 V VC @ 1.0 A | Larger footprint (SMB vs SMA); requires PCB layout change; same thermal derating profile | Choose only if existing design uses SMB footprint or higher thermal mass is needed for sustained pulse duty cycles |
Compared with SMA6J18A R3G, the Vishay alternative offers near-identical electrical behavior with minimal clamping variance, while the ON Semiconductor part trades smaller size for larger package and higher clamping - impacting board space and protection margin respectively.
Availability
SMA6J18A R3G is available at Aetrix Electronics and suitable for automotive electronics, industrial DC/DC converters, and LED lighting systems requiring stable component supply and ISO 7637-2-compliant surge resilience.
Supply support for SMA6J18A R3G 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 power management, protection, and signal conditioning devices.
The SMA6Jx series is designed specifically for robust, high-reliability transient suppression in automotive and industrial power systems where compact size, fast response, and standardized test compliance are critical.
FAQ
What is the maximum clamping voltage of SMA6J18A R3G at its rated peak pulse current?
The SMA6J18A R3G has a maximum clamping voltage (VC) of 28.3 V when subjected to a 1.0 A peak pulse current (IPPM) under the standard 10/1000 μs waveform. This value is measured per the manufacturer's test conditions and defines the upper voltage limit imposed on protected circuits during surge events.
Does SMA6J18A R3G meet automotive surge immunity standards?
Yes, SMA6J18A R3G is explicitly rated to meet ISO 7637-2 for Pulse 1, 2a, 2b, 3a, and 3b waveforms. Its 600 W peak pulse power rating, fast <1.0 ps response, and specified clamping behavior make it suitable for protecting electronic control units and power modules in automotive 12 V systems.
What is the package type and mounting configuration of SMA6J18A R3G?
SMA6J18A R3G uses the DO-214AC (SMA) surface-mount package - a compact, low-profile outline with matte tin-plated leads. It is designed for automated placement and reflow soldering, with polarity indicated by a cathode band on the body.
What is the operating junction temperature range for SMA6J18A R3G?
The SMA6J18A R3G supports an operating junction temperature range of −55°C to +175°C. This wide thermal envelope enables deployment in under-hood automotive locations, industrial motor drives, and other high-ambient-temperature environments without derating concerns up to TJ = 175°C.
Is SMA6J18A R3G halogen-free and RoHS compliant?
Yes, SMA6J18A R3G is both RoHS compliant and halogen-free in accordance with IEC 61249-2-21. The molding compound and metallization are formulated to meet environmental regulations for lead-free assembly and restricted substance content.
SMA6J18A R3G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AC, SMA
- Series:
- SMA6J
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 18V
- Voltage - Breakdown (Min):
- 20V
- Voltage - Clamping (Max) @ Ipp:
- 28.3V
- Current - Peak Pulse (10/1000µs):
- 21.2A
- 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)
SMA6J18A R3G FAQ
1.How can I place an order for SMA6J18A R3G through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA6J18A R3G 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 SMA6J18A R3G reliable?
The price and inventory of SMA6J18A R3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA6J18A R3G is usually 5 days.
3.What payment methods are accepted for SMA6J18A R3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA6J18A R3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA6J18A R3G?
SMA6J18A R3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA6J18A R3G 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 SMA6J18A R3G?
For technical support, including SMA6J18A R3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA6J18A R3G requirements.
6.How does Aetrix verify that SMA6J18A R3G is sourced from the original manufacturer or authorized distributors?
All SMA6J18A R3G 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 SMA6J18A R3G meets industry standards.
7.What is the process for return or replacement of SMA6J18A R3G?
All SMA6J18A R3G units undergo pre-shipment inspection (PSI). If there is an issue with SMA6J18A R3G, 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 SMA6J18A R3G part is unused and in its original packaging.
Return procedure for SMA6J18A R3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMA6J18A R3G Tags
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