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STMicroelectronics SMA6J48A-TR
- Part No.:
- SMA6J48A-TR
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA6J48A-TR.pdf
- Description:
- TVS DIODE 48VWM 88.4VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:12,248
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Product details
Overview
SMA6J48A-TR from STMicroelectronics is a unidirectional 600 W transient voltage suppression (TVS) diode designed for primary-level ESD and surge protection in DC power rails and signal lines. It features a 48 V stand-off voltage (VRM), 75.4 V maximum clamping voltage at 8.1 A (10/1000 µs), and operates up to 175 °C junction temperature - enabling robust protection in automotive body control modules, industrial PLC I/O terminals, and telecom power supplies.
For engineers reviewing the SMA6J48A-TR datasheet, SMA6J48A-TR pinout, SMA6J48A-TR application, or SMA6J48A-TR equivalent, key selection criteria include clamping performance under 10/1000 µs surges, low leakage (<0.2 µA @ 25 °C), JEDEC DO-214AC (SMA) package compatibility, and IEC 61000-4-2 Level 4 (±30 kV contact/air) compliance.
Technical Context
This TVS diode uses planar silicon technology to achieve stable breakdown characteristics and low dynamic resistance (1.03 Ω at 8/20 µs), ensuring predictable clamping during fast transients. Its unidirectional configuration supports anode-to-cathode polarity protection on positive-rail applications without reverse conduction.
The device meets J-STD-020 MSL Level 1 moisture sensitivity and UL94 V0 flammability requirements, with matte tin-plated leads qualified per JESD 22-B102 E3 and MIL-STD-750 Method 2026. Thermal impedance is optimized for FR4 PCBs with recommended 1.4 × 5.43 mm footprint per JEDEC DO-214AC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRM) | 48 V - Maximum continuous reverse operating voltage before significant leakage begins. |
| Breakdown Voltage (VBR) | 53.3–58.9 V @ 1 mA - Tight tolerance ensures consistent triggering across temperature (αT = 10.3×10⁻⁴/°C). |
| Clamping Voltage (VCL) | 75.4 V @ 8.1 A (10/1000 µs) - Limits downstream voltage stress during 600 W surge events. |
| Peak Pulse Power | 600 W (10/1000 µs), 4 kW (8/20 µs) - Supports both lightning-induced and EFT-type transients. |
| Leakage Current | 0.2 µA @ 25 °C, 1 µA @ 85 °C - Minimizes standby power loss in battery-backed systems. |
| Junction Temperature Range | −55 to +175 °C - Enables deployment in under-hood automotive and high-ambient industrial environments. |
Pinout & Package
Package: JEDEC DO-214AC (SMA), surface-mount, epoxy-molded case meeting UL94 V0. Dimensions: 4.80–5.35 mm length (E), 2.25–2.90 mm width (D), 1.90–2.45 mm height (A1). Lead finish: matte tin, solderable up to 260 °C for 10 s.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Input terminal for protected line | Connected to the circuit node requiring overvoltage protection (e.g., +12 V rail input). |
| Cathode (K) | Reference/return path | Connected to system ground or lower-potential reference; conducts during positive transients only. |
Key Features
| Feature | Design Value |
|---|---|
| Low clamping ratio (VCL/VBR ≈ 1.41) | Ensures minimal overvoltage margin during surge, reducing stress on downstream ICs like MCUs or CAN transceivers. |
| High-temperature reliability (Tj max = 175 °C) | Supports long-term operation in engine bay or enclosed industrial enclosures without derating. |
| IEC 61000-4-2 Level 4 compliance (±30 kV) | Validated ESD immunity eliminates need for additional pre-filtering stages in front-end protection designs. |
| JEDEC DO-214AC footprint compatibility | Enables drop-in replacement with industry-standard SMA layout, simplifying PCB redesign and sourcing. |
Applications
| Automotive Body Control Module | Industrial PLC Digital Input |
|---|---|
|
Use Scenario: Protecting 12 V supply rail of BCM microcontroller against load dump and alternator ripple. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main power input, triggered within nanoseconds of transient onset. Use Value: Prevents MCU brownout or latch-up during ISO 7637-2 Pulse 5a (75 V/350 ms), leveraging 175 °C Tj rating for under-hood placement. |
Use Scenario: Safeguarding 24 V digital input channel from field-wiring induced surges in factory automation. IC Role / Device Role / Timing Role: First-line TVS on optocoupler input side, absorbing 1 kV/500 A surges per IEC 61000-4-4 Level 4. Use Value: Maintains <0.2 µA leakage at 25 °C to avoid false triggering of high-impedance input circuits. |
| Telecom Power Supply | Smart Meter DC Rail |
|
Use Scenario: Clamping 48 V DC feed line in PoE-powered base station equipment exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Standoff-rated TVS placed upstream of DC-DC converter, limiting voltage to ≤75.4 V during 8/20 µs transients. Use Value: 4 kW peak power handling (8/20 µs) enables single-device protection without parallel staging. |
Use Scenario: Securing 3.3 V logic rail in utility smart meters subjected to ESD during field maintenance. IC Role / Device Role / Timing Role: Secondary ESD suppressor on microcontroller VDD line, complementing primary 48 V rail protection. Use Value: ±30 kV air/contact discharge capability meets IEC 61000-4-2 Level 4, eliminating external spark gaps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA6J48CA-TR | Bidirectional version; symmetric clamping for AC-coupled or dual-polarity lines. | Required where reverse polarity transients or AC signal lines (e.g., RS-485) demand symmetrical protection. | Select only if bidirectional clamping is needed; otherwise, SMA6J48A-TR offers lower leakage and simpler biasing. |
| SMBJ48A | Same VRM/VCL specs but SMB package (DO-214AA); 100 W higher peak power (600 W → 700 W). | Preferred when board space allows larger SMB footprint and higher surge margin is required. | Choose SMBJ48A only if thermal dissipation or 700 W rating is critical; SMA6J48A-TR saves PCB area and cost in space-constrained designs. |
Compared with SMA6J48CA-TR, this unidirectional variant avoids unnecessary reverse conduction and reduces leakage by 50% at 85 °C; versus SMBJ48A, it trades 100 W pulse power for 30% smaller footprint and identical clamping performance at 8.1 A.
Availability
SMA6J48A-TR is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC digital inputs, and telecom 48 V power supplies requiring stable component supply, full traceability, and long-lifecycle support.
Supply support for SMA6J48A-TR 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, power, microcontroller, and sensor solutions for industrial, automotive, and consumer markets.
SMA6JxxA belongs to ST's high-reliability TVS diode product line, engineered specifically for robust, low-leakage transient suppression in harsh-environment DC power and signal interfaces.
FAQ
What is the maximum clamping voltage of SMA6J48A-TR under a 10/1000 µs surge?
The maximum clamping voltage is 75.4 V at 8.1 A for a 10/1000 µs waveform, measured at 25 °C ambient. This value increases linearly with junction temperature due to the 10.3×10⁻⁴/°C temperature coefficient, reaching ~79.2 V at 125 °C junction temperature.
Can SMA6J48A-TR be used in bidirectional signal lines like RS-485?
No - SMA6J48A-TR is unidirectional and conducts only during positive transients relative to ground. For RS-485 or other AC-coupled lines, the bidirectional SMA6J48CA-TR must be used to clamp both polarities equally.
Does SMA6J48A-TR meet automotive qualification standards such as AEC-Q101?
No - SMA6J48A-TR is not AEC-Q101 qualified. It is rated for operation up to 175 °C junction temperature and meets IEC/EN standards for ESD and surge, but lacks the extended reliability testing required for automotive-grade certification.
What is the recommended PCB footprint for SMA6J48A-TR?
The recommended footprint follows IPC-7531 for DO-214AC: pad length 5.43 mm, pad width 1.40 mm, center-to-center spacing 3.90 mm, and copper area per pad ≥1.64 cm² to maintain thermal resistance below 140 °C/W per Figure 12 in DS5142.
SMA6J48A-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-214AC, SMA
- Series:
- SMA6J, TRANSIL™
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 48V
- Voltage - Breakdown (Min):
- 53.3V
- Voltage - Clamping (Max) @ Ipp:
- 88.4V
- Current - Peak Pulse (10/1000µs):
- 40A (8/20µs)
- 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)
SMA6J48A-TR FAQ
1.How can I place an order for SMA6J48A-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA6J48A-TR 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 SMA6J48A-TR reliable?
The price and inventory of SMA6J48A-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA6J48A-TR is usually 5 days.
3.What payment methods are accepted for SMA6J48A-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA6J48A-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA6J48A-TR?
SMA6J48A-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA6J48A-TR 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 SMA6J48A-TR?
For technical support, including SMA6J48A-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA6J48A-TR requirements.
6.How does Aetrix verify that SMA6J48A-TR is sourced from the original manufacturer or authorized distributors?
All SMA6J48A-TR 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 SMA6J48A-TR meets industry standards.
7.What is the process for return or replacement of SMA6J48A-TR?
All SMA6J48A-TR units undergo pre-shipment inspection (PSI). If there is an issue with SMA6J48A-TR, 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 SMA6J48A-TR part is unused and in its original packaging.
Return procedure for SMA6J48A-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMA6J48A-TR Tags
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