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Taiwan Semiconductor Corporation SMA6J18AHR3G
- Part No.:
- SMA6J18AHR3G
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA6J18AHR3G.pdf
- Description:
- TVS DIODE 18VWM 28.3VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,973
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Product details
Overview
SMA6J18AHR3G 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; designed for surge protection in DC/DC converters and automotive power systems.
For engineers reviewing the SMA6J18AHR3G datasheet, SMA6J18AHR3G pinout, SMA6J18AHR3G application, or SMA6J18AHR3G equivalent, key selection criteria include its DO-214AC (SMA) package, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, 175°C junction temperature rating, and 1.0 ps typical response time - critical for robust ESD and load-dump immunity in embedded power rails.
Technical Context
This unidirectional TVS diode operates as a reverse-biased avalanche clamp, activated when transient voltage exceeds its breakdown threshold (20–22.1 V at 1 mA). It delivers 600 W peak pulse power under the standardized 10/1000 μs waveform and maintains low leakage (<1.0 µA at 18 V) during normal operation.
The device uses a glass-passivated silicon junction housed in a DO-214AC (SMA) package with matte tin-plated leads, rated for JESD201 Class 2 whisker resistance and moisture sensitivity level 1. Its polarity is marked by a cathode band, and it supports automated SMT placement.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR @ IT=1 mA | 20–22.1 V - Verified avalanche onset range ensures reliable triggering across process variation |
| VC @ IPPM=1.0 A | 28.3 V - Clamped voltage limits downstream IC stress during 10/1000 μs transients |
| PPPM | 600 W - Peak pulse power handling per ISO 7637-2 Pulse 5a (load dump) |
| TJ max | 175 °C - Enables operation in under-hood automotive environments and high-ambient industrial power supplies |
| IR @ VWM | <1.0 µA - Negligible leakage preserves efficiency in battery-backed or low-power standby circuits |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, single-diode configuration with cathode indicated by molded band. Dimensions conform to JEDEC DO-214AC standard; lead finish is matte tin, solderable per J-STD-002.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / low-impedance path to ground during clamping | Connected to protected line (e.g., +12V rail); conducts surge current to common ground reference |
| Cathode | Reverse-biased terminal / voltage reference node | Connected to system ground; defines clamping threshold relative to ground potential |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Enhances long-term reliability and stability of breakdown voltage under thermal cycling and humidity stress |
| 1.0 ps typical response time | Enables suppression of fast-rising ESD events (IEC 61000-4-2) before sensitive circuitry is damaged |
| ISO 7637-2 compliance (Pulse 1/2a/2b/3a/3b) | Validated for automotive electronics subjected to battery disconnect, inductive switching, and coupling noise |
| DO-214AC (SMA) package | Supports high-volume automated assembly and provides mechanical robustness for vibration-prone applications |
Applications
| Automotive Infotainment Power Rail | Industrial PLC Input Module |
|---|---|
Use Scenario: Protecting USB-C PD controller and display interface power lines from load-dump transients in vehicle head units. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between 12 V supply and ground, triggered within 1.0 ps to limit voltage to ≤28.3 V. Use Value: Prevents latch-up or permanent damage to PMICs and level shifters exposed to ISO 7637-2 Pulse 5a (up to 60 V, 400 ms). | Use Scenario: Safeguarding 24 V digital input circuitry against field-wiring induced surges in factory automation controllers. IC Role / Device Role / Timing Role: Standoff-rated protector on optocoupler input side, absorbing repetitive 1 kV/500 A transients per IEC 61000-4-5. Use Value: Maintains signal integrity and extends optocoupler lifetime by limiting transient energy dissipated across isolation barrier. |
| LED Driver Secondary Side | Telecom DC/DC Converter Output |
Use Scenario: Shielding constant-current LED driver output from back-EMF spikes generated by relay switching in streetlight control systems. IC Role / Device Role / Timing Role: Reverse-biased TVS connected across LED string terminals, clamping inrush and inductive kickback. Use Value: Eliminates visible flicker and prevents premature LED degradation caused by >30 V overvoltage excursions. | Use Scenario: Securing isolated 5 V output of telecom-grade DC/DC module against board-level ESD and cross-coupling noise. IC Role / Device Role / Timing Role: Final-stage transient suppressor located immediately after filter capacitor, referenced to local ground plane. Use Value: Ensures uninterrupted operation of baseband processors and SerDes interfaces during hot-swap and cable-connect events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA6J18AHE3/73 (Vishay) | Identical DO-214AC package, same VWM/VBR/VC specs, but rated for 150°C TJ max (vs. 175°C) | Limited to lower-ambient industrial use; not qualified for under-hood automotive | Select SMA6J18AHR3G when junction temperature must reach 175°C in sustained operation |
| 1.5SMC18A (ON Semiconductor) | Same 18 V VWM, but higher VC = 29.2 V at 1.0 A and larger DO-214AB (SMB) package (3.5 mm width vs. 2.8 mm) | Requires PCB layout revision due to wider body; less effective clamping margin for tight-tolerance rails | Choose SMA6J18AHR3G for space-constrained designs needing tighter clamping and automotive qualification |
Compared with SMA6J18AHE3/73 and 1.5SMC18A, the SMA6J18AHR3G offers superior thermal capability (175°C vs. 150°C/150°C), tighter clamping (28.3 V vs. 29.2 V), and smaller footprint - making it optimal for automotive and high-density industrial power protection where thermal headroom and layout efficiency are critical.
Availability
SMA6J18AHR3G is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLC input modules, and LED driver secondary-side protection requiring stable component supply and full ISO 7637-2 compliance.
Supply support for SMA6J18AHR3G 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 SMA6JxxA series was developed specifically for automotive and industrial transient suppression, emphasizing high-temperature reliability, fast response, and international surge standard compliance - targeting power rail hardening in harsh electromagnetic environments.
FAQ
What is the maximum clamping voltage of SMA6J18AHR3G at its rated peak pulse current?
The SMA6J18AHR3G has a maximum clamping voltage (VC) of 28.3 V when subjected to a 1.0 A peak pulse current with a 10/1000 μs waveform. This value is measured per standard test conditions (TA = 25°C) and ensures downstream components remain below safe overvoltage thresholds during transient events. The SMA6J18AHR3G's low clamping ratio supports robust protection in 12 V and 24 V systems.
Is SMA6J18AHR3G compliant with automotive surge standards?
Yes, the SMA6J18AHR3G meets ISO 7637-2 requirements for Pulse 1, 2a, 2b, 3a, and 3b, covering common automotive transient threats including battery disconnection, inductive load switching, and capacitive coupling. It is not rated for Pulse 5a (load dump), which requires higher energy handling; however, its 600 W PPPM rating aligns with many extended load-dump implementations when used with upstream filtering. The SMA6J18AHR3G is widely deployed in automotive infotainment and body control modules.
What is the operating junction temperature range for SMA6J18AHR3G?
The SMA6J18AHR3G supports an operating junction temperature range of –55°C to +175°C, verified per absolute maximum ratings. This extended range enables deployment in under-hood automotive locations, industrial motor drives, and outdoor lighting systems where ambient temperatures exceed 125°C. Derating curves in the official datasheet confirm usable power dissipation down to –55°C, ensuring reliability across full industrial and automotive temperature profiles. The SMA6J18AHR3G's 175°C TJ max exceeds most competing 600 W TVS diodes.
Does SMA6J18AHR3G have a halogen-free construction?
Yes, the SMA6J18AHR3G is halogen-free in accordance with IEC 61249-2-21, and its molding compound meets UL 94V-0 flammability rating. The device also complies with RoHS Directive 2011/65/EU. These material qualifications support environmentally conscious manufacturing and end-of-life processing without release of corrosive or toxic gases during soldering or thermal stress. The SMA6J18AHR3G's green compound marking confirms halogen-free status per TSC's internal material declarations.
What packaging format is supplied for SMA6J18AHR3G?
The SMA6J18AHR3G is supplied in 7,500-piece tape-and-reel format per DO-214AC (SMA) industry standard, compatible with high-speed pick-and-place equipment. The reel conforms to EIA-481-D specifications, and the carrier tape features embossed pockets with transparent cover tape. Each reel includes traceable lot coding and complies with J-STD-020 moisture sensitivity level 1 - meaning floor life is unlimited at ≤30°C/60% RH, eliminating bake requirements prior to reflow. The SMA6J18AHR3G's packaging supports automated SMT assembly without handling or oxidation concerns.
SMA6J18AHR3G 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMA6J18AHR3G FAQ
1.How can I place an order for SMA6J18AHR3G through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA6J18AHR3G 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 SMA6J18AHR3G reliable?
The price and inventory of SMA6J18AHR3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA6J18AHR3G is usually 5 days.
3.What payment methods are accepted for SMA6J18AHR3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA6J18AHR3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA6J18AHR3G?
SMA6J18AHR3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA6J18AHR3G 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 SMA6J18AHR3G?
For technical support, including SMA6J18AHR3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA6J18AHR3G requirements.
6.How does Aetrix verify that SMA6J18AHR3G is sourced from the original manufacturer or authorized distributors?
All SMA6J18AHR3G 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 SMA6J18AHR3G meets industry standards.
7.What is the process for return or replacement of SMA6J18AHR3G?
All SMA6J18AHR3G units undergo pre-shipment inspection (PSI). If there is an issue with SMA6J18AHR3G, 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 SMA6J18AHR3G part is unused and in its original packaging.
Return procedure for SMA6J18AHR3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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