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Taiwan Semiconductor Corporation SMA6J28A
- Part No.:
- SMA6J28A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA6J28A.pdf
- Description:
- TVS DIODE 28VWM 44VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,758
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Product details
Overview
SMA6J28A from Taiwan Semiconductor is a 600W surface-mount transient voltage suppressor (TVS) diode with a 28V working standoff voltage, 31.1–34.4V breakdown range at 1mA, and 44.0V clamping voltage at 13.6A peak pulse current; designed for automotive and industrial DC/DC converter surge protection per ISO 7637-2 Pulse 1/2a/2b/3a/3b.
For engineers reviewing the SMA6J28A datasheet, SMA6J28A pinout, SMA6J28A application, or SMA6J28A equivalent, key selection criteria include clamping performance under 10/1000μs transients, DO-214AC (SMA) package compatibility with automated SMT lines, moisture sensitivity level 1 handling, and compliance with RoHS and halogen-free standards.
Technical Context
This unidirectional TVS diode uses a glass-passivated silicon junction to achieve sub-1ps response time and stable clamping during fast-rising ESD or load-dump events. Its single-die DO-214AC configuration supports reverse-biased operation with cathode-band polarity marking and operates across –55°C to +175°C junction temperature.
The device delivers 600W non-repetitive peak pulse power per 10/1000μs waveform while maintaining <1.0μA reverse leakage at 28V and 13.6A maximum impulse current - enabling robust protection in space-constrained 12V/24V automotive subsystems without derating below 125°C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR @ IT=1mA | 31.1–34.4 V - Verified breakdown threshold ensuring reliable turn-on during overvoltage events |
| VC @ IPPM=13.6A | 44.0 V - Clamped voltage limiting downstream IC stress during 10/1000μs transients |
| PPPM | 600 W - Peak pulse power handling capability per standard 10/1000μs waveform |
| TJ Range | –55°C to +175°C - Full operational junction temperature range for under-hood automotive use |
| Package | DO-214AC (SMA) - Surface-mount outline with matte tin-plated leads, J-STD-002 solderable |
| MSL | Level 1 - No floor-life limitation; safe for reflow without dry-pack requirements |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with cathode band indicating terminal polarity; 0.060g weight; UL 94V-0 rated compound; JESD201 Class 2 whisker-resistant terminations.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction path | Connected to system ground or low-side reference in reverse-biased TVS configuration |
| Cathode | Clamping node | Connected to protected line (e.g., 24V rail); conducts during overvoltage to clamp voltage to ≤44.0V |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling |
| Sub-1ps response time | Enables effective suppression of ESD and fast-edge transients before sensitive ICs are damaged |
| ISO 7637-2 compliance | Validated for automotive load-dump and supply-line transient immunity (Pulse 1/2a/2b/3a/3b) |
| Halogen-free & RoHS | Meets IEC 61249-2-21 and EU RoHS Directive for environmentally compliant manufacturing |
| Moisture sensitivity level 1 | Eliminates bake requirements prior to reflow, reducing production overhead and risk of popcorning |
Applications
| Switching Mode Power Supply (SMPS) | Automotive On-Board DC/DC Converter |
|---|---|
Use Scenario: Protection of primary-side MOSFET gate drivers and secondary-side rectifiers against switching-induced voltage spikes. IC Role / Device Role / Timing Role: Unidirectional TVS placed across input/output rails to clamp transients before they reach power ICs. Use Value: Limits clamped voltage to 44.0V during 600W 10/1000μs surges, preventing latch-up or gate oxide rupture in 30V-rated controllers. | Use Scenario: Safeguarding 12V-to-5V/3.3V buck converters in engine control units exposed to battery load-dump pulses. IC Role / Device Role / Timing Role: Reverse-biased TVS on input rail, triggered within <1ps to shunt energy during ISO 7637-2 Pulse 2b (inductive switch-off). Use Value: Maintains clamping below 44.0V at 13.6A, protecting downstream LDOs and microcontrollers rated for ≤40V absolute max. |
| LED Lighting Driver | Industrial 24V Fieldbus Interface |
Use Scenario: Transient suppression on constant-current LED driver outputs subject to cable-disconnect arcs and ESD. IC Role / Device Role / Timing Role: TVS connected anode-to-ground, cathode-to-output, clamping reverse polarity and inductive kickback. Use Value: Withstands 50A non-repetitive forward surge (IFSM) and holds VC ≤44.0V, preserving LED string integrity during hot-swap events. | Use Scenario: Input protection for RS-485 transceivers on factory-floor PLC I/O modules powered from shared 24V bus. IC Role / Device Role / Timing Role: Single-diode TVS on bus line to absorb repetitive EFT bursts and lightning-induced surges. Use Value: Delivers 600W peak pulse power handling with <1.0μA leakage at 28V, minimizing standby current impact on bus bias networks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ28A | Same VWM/VBR/VC, but SMB package (DO-214AA) - 2.5mm wider body, higher thermal mass | Lower power density; requires larger PCB area but offers improved steady-state dissipation (5W vs. 4W) | Select when board layout allows larger footprint and thermal management prioritizes long-duration surge handling |
| 1.5SMC28A | Same electrical specs, but SMC package (DO-214AB) - 3.5mm width, 1.5kW peak rating, higher IPPM (43.5A) | Higher surge margin for infrequent extreme events; not optimized for high-frequency automotive pulse repetition | Choose when legacy SMC land pattern exists or system-level testing demands >600W headroom |
Compared with SMA6J28A, SMBJ28A trades compactness for thermal robustness in sustained surge scenarios, while 1.5SMC28A provides higher peak current capacity at the cost of slower response due to larger junction capacitance - making SMA6J28A optimal for space-constrained, high-repetition automotive DC/DC protection.
Availability
SMA6J28A is available at Aetrix Electronics and suitable for automotive ECUs, industrial 24V fieldbus interfaces, and LED lighting drivers requiring stable component supply with full traceability and no obsolescence risk through 2030.
Supply support for SMA6J28A 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, and power MOSFETs since 1979.
The SMA6Jx series was developed specifically for AEC-Q101-compliant automotive transient suppression, targeting compact, high-reliability protection in engine bay and chassis-mounted electronics where DO-214AC footprint and MSL Level 1 handling are critical.
FAQ
What is the clamping voltage of SMA6J28A at its rated peak pulse current?
The SMA6J28A has a maximum clamping voltage (VC) of 44.0 V at 13.6 A peak pulse current (IPPM) under the standard 10/1000μs waveform. This value is measured per JEDEC test conditions and ensures downstream components see no more than 44.0 V during transient events. The SMA6J28A maintains this clamping performance across its full operating temperature range of –55°C to +175°C.
Does SMA6J28A meet automotive transient immunity standards?
Yes, the SMA6J28A meets ISO 7637-2 requirements for Pulse 1, 2a, 2b, 3a, and 3b, making it suitable for 12V and 24V automotive subsystems. It is also qualified to AEC-Q101 for stress testing including temperature cycling, humidity bias, and mechanical shock. The SMA6J28A's glass-passivated junction and DO-214AC package support reliable operation in under-hood environments.
What is the maximum steady-state power dissipation for SMA6J28A?
The SMA6J28A has a steady-state power dissipation (PD) rating of 4 W at 25°C ambient temperature. Derating is required above 25°C per the published pulse derating curve; at 125°C ambient, the usable PD drops to approximately 2.0 W. This rating applies only to continuous DC or low-frequency power dissipation - not to transient surge events covered by the 600W PPPM specification.
Is SMA6J28A compatible with lead-free reflow processes?
Yes, the SMA6J28A features matte tin-plated leads compliant with J-STD-002 and rated for standard lead-free reflow profiles (peak temperature up to 260°C). Its moisture sensitivity level is rated at Level 1 per J-STD-020, meaning it can be stored indefinitely at ambient conditions and placed directly into reflow without baking or dry-pack handling.
How does the breakdown voltage tolerance of SMA6J28A affect circuit design?
The SMA6J28A has a specified breakdown voltage (VBR) range of 31.1 V to 34.4 V at 1 mA test current, providing a ±5.3% tolerance band. This ensures consistent turn-on behavior across production lots while allowing designers to verify that VBR exceeds the system's maximum normal operating voltage (28 V) by ≥11%, avoiding false triggering during ripple or startup overshoot.
SMA6J28A 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):
- 28V
- Voltage - Breakdown (Min):
- 31.1V
- Voltage - Clamping (Max) @ Ipp:
- 44V
- Current - Peak Pulse (10/1000µs):
- 13.6A
- 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)
SMA6J28A FAQ
1.How can I place an order for SMA6J28A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA6J28A 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 SMA6J28A reliable?
The price and inventory of SMA6J28A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA6J28A is usually 5 days.
3.What payment methods are accepted for SMA6J28A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA6J28A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA6J28A?
SMA6J28A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA6J28A 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 SMA6J28A?
For technical support, including SMA6J28A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA6J28A requirements.
6.How does Aetrix verify that SMA6J28A is sourced from the original manufacturer or authorized distributors?
All SMA6J28A 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 SMA6J28A meets industry standards.
7.What is the process for return or replacement of SMA6J28A?
All SMA6J28A units undergo pre-shipment inspection (PSI). If there is an issue with SMA6J28A, 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 SMA6J28A part is unused and in its original packaging.
Return procedure for SMA6J28A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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