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STMicroelectronics SMAJ48CA-TR
- Part No.:
- SMAJ48CA-TR
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ48CA-TR.pdf
- Description:
- TVS DIODE 48VWM 100VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:18,956
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Product details
Overview
SMAJ48CA-TR from STMicroelectronics is a bidirectional transient voltage suppression (TVS) diode designed for robust ESD and surge protection in DC power rails and signal lines. It features a 48 V standoff voltage (VRM), 77.4 V maximum clamping voltage at 5.2 A (10/1000 µs), 400 W peak pulse power rating, and operates up to 150 °C junction temperature - deployed in industrial power supplies and automotive body control modules.
For engineers reviewing the SMAJ48CA-TR datasheet, SMAJ48CA-TR pinout, SMAJ48CA-TR application, or SMAJ48CA-TR equivalent, key selection criteria include bidirectional clamping behavior, low leakage (<0.2 µA @ 25 °C), JEDEC DO-214AC (SMA) package compatibility, IEC 61000-4-2 (±30 kV contact/air) and IEC 61000-4-4 (4 kV) compliance, and thermal stability under repeated surge stress.
Technical Context
This TVS diode uses planar silicon junction technology to achieve low dynamic resistance (1.79 Ω) and stable clamping across temperature (αT = 10⁻⁴/°C). Its bidirectional architecture enables symmetrical protection on AC-coupled or floating lines without polarity dependency.
The device meets MIL-STD-883 method 3015 for ESD and IEC 61000-4-4 Level 4 for fast transient bursts, with verified performance at 8/20 µs (100 A) and 10/1000 µs (5.2 A) waveforms. Solderability complies with J-STD-020 MSL Level 1 and JESD 22-B102 E3.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRM) | 48 V - Maximum continuous reverse operating voltage before breakdown; defines minimum system rail margin. |
| Breakdown Voltage (VBR min) | 53.3 V @ 1 mA - Guaranteed conduction onset; ensures reliable triggering above nominal rail. |
| Clamping Voltage (VCL max) | 77.4 V @ 5.2 A (10/1000 µs) - Peak voltage seen by protected circuit during surge; limits downstream stress. |
| Peak Pulse Power (PPP) | 400 W (10/1000 µs) - Sustained surge energy handling per IEC 61000-4-4; validates use in sub-600 W systems. |
| Leakage Current (IRM) | 0.2 µA @ 25 °C - Negligible standby current draw; preserves battery life and signal integrity in low-power nodes. |
| Junction Temperature Range | –55 °C to +150 °C - Enables deployment in under-hood automotive or industrial enclosures without derating. |
| ESD Rating | ±30 kV (IEC 61000-4-2, contact & air) - Exceeds Level 4; eliminates need for external ESD staging in USB/HDMI interfaces. |
Pinout & Package
Package: JEDEC DO-214AC (SMA), surface-mount, single-row two-terminal configuration with matte tin-plated leads compliant with J-STD-002 and JESD 22-B102 E3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (Bidirectional) | Reversible surge current path | No polarity assignment - either terminal serves as anode or cathode depending on transient polarity; enables AC line protection without orientation constraints. |
| Cathode Band (Marked End) | Manufacturing reference marker | Indicates terminal position per DO-214AC outline; used for automated optical inspection and placement verification - not functional polarity indicator for bidirectional devices. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables symmetric overvoltage protection on floating or AC-coupled lines (e.g., RS-485, CAN FD, audio inputs) without external diode pairing. |
| Low dynamic resistance (RD) | 1.79 Ω - Minimizes voltage overshoot during high-current transients; critical for protecting 3.3 V/5 V logic behind LDOs or DC-DC converters. |
| High-temperature reliability | Rated to 150 °C TJ - Maintains clamping consistency in engine control units, motor drives, and PoE-powered equipment where ambient exceeds 85 °C. |
| JEDEC-compliant footprint | IPC-7531 standard SMA pad layout - Ensures mechanical stability and thermal dissipation on FR4 PCBs with 70 µm copper; supports reflow per J-STD-020. |
| Whisker-resistant plating | JESD-201 Class 2 matte tin - Eliminates tin whisker risk in long-life industrial deployments (>10 years) without conformal coating. |
Applications
| Industrial Power Input Protection | Automotive Body Control Module (BCM) |
|---|---|
|
Use Scenario: 24 V DC input stage of programmable logic controllers exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Primary surge shunt element placed upstream of DC-DC converter input; clamps transients within 1 ns response time. Use Value: Limits peak voltage to ≤77.4 V during 10/1000 µs surges, preventing MOSFET gate oxide rupture and enabling use of lower-voltage-rated input capacitors. |
Use Scenario: LIN bus transceiver power supply rail in door module electronics subject to ESD and battery reversal events. IC Role / Device Role / Timing Role: Bidirectional rail clamp between VBAT and GND; suppresses ±30 kV contact discharge per IEC 61000-4-2 without polarity concern. Use Value: Maintains <0.2 µA leakage at 25 °C, avoiding false wake-up in sleep mode while surviving 150 °C under-hood thermal cycling. |
| RS-485 Data Line Protection | Smart Meter Communication Interface |
|
Use Scenario: Differential pair (A/B) of isolated RS-485 transceivers connected to outdoor utility infrastructure with lightning-induced surges. IC Role / Device Role / Timing Role: Common-mode TVS pair (one per line) referenced to ground; clamps common-mode transients exceeding 48 V standoff. Use Value: Delivers 400 W (10/1000 µs) surge handling with 1.79 Ω RD, reducing induced differential noise and preserving signal integrity up to 10 Mbps. |
Use Scenario: PLC or RF communication port (e.g., NB-IoT modem) in electricity meters installed in electrically noisy substations. IC Role / Device Role / Timing Role: Secondary protection stage after gas discharge tube (GDT); absorbs residual energy from IEC 61000-4-4 Level 4 (4 kV) bursts. Use Value: Withstands 8/20 µs surges up to 100 A while maintaining <1 µA leakage at 85 °C - ensuring meter accuracy and regulatory certification compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ48CA-TR | Higher PPP (600 W), larger SMB package (DO-214AA), 1.5× higher RD (2.62 Ω) | Better suited for 12 V/24 V automotive load dump where energy >400 W is expected | Select when surge energy exceeds 400 W but board space allows SMB footprint. |
| SMCJ48CA-TR | 1500 W PPP, SMC package (DO-214AB), 3.75 Ω RD, 2× thermal mass | Required for ISO 16750-2 pulse 5a (load dump) in engine bay ECUs | Choose only if system-level testing confirms >600 W surge exposure and thermal management supports SMC size. |
Compared with SMBJ48CA-TR and SMCJ48CA-TR, SMAJ48CA-TR offers optimal balance of compact DO-214AC footprint, 400 W capability, and low RD for cost-sensitive industrial and body electronics - avoiding over-engineering where full load-dump immunity is unnecessary.
Availability
SMAJ48CA-TR is available at Aetrix Electronics and suitable for industrial power input protection, automotive body control modules, RS-485 data line hardening, and smart meter communication interfaces requiring stable component supply and long-term obsolescence management.
Supply support for SMAJ48CA-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, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.
The SMAJ series belongs to ST's transient protection portfolio, engineered specifically for high-reliability, low-leakage, high-temperature TVS applications in harsh environments - emphasizing planar junction stability and JEDEC-compliant manufacturability.
FAQ
What is the difference between SMAJ48CA-TR and SMAJ48A-TR?
SMAJ48CA-TR is bidirectional, providing symmetrical clamping for both positive and negative transients on AC or floating lines; SMAJ48A-TR is unidirectional, conducting only in reverse bias and requiring correct polarity installation. The "CA" suffix denotes bidirectional functionality per ST's marking convention and electrical characterization in Table 2.
Can SMAJ48CA-TR be used in place of a unidirectional TVS in a DC power rail?
Yes - SMAJ48CA-TR functions identically to a unidirectional device when installed across a DC rail (e.g., VCC–GND), clamping both overvoltage and reverse-polarity events. Its bidirectional nature adds fault tolerance without penalty, though design must account for identical clamping in both directions.
Does SMAJ48CA-TR meet automotive AEC-Q200 requirements?
No - SMAJ48CA-TR is not AEC-Q200 qualified. It meets industrial and commercial reliability standards (JESD22, J-STD-020), but automotive-grade equivalents like the Automotive SMAJ series (e.g., SMAJ48CA-AU) undergo additional stress testing and require separate qualification documentation.
How does junction temperature affect clamping voltage in SMAJ48CA-TR?
VCL increases linearly with junction temperature at αT = 10⁻⁴/°C; for example, at 125 °C, VCL rises ~1% above its 25 °C value (77.4 V → ~78.2 V). This is accounted for in design margins using the formula VCL(Tj) = VCL(25°C) × [1 + αT × (Tj – 25)].
SMAJ48CA-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-214AC, SMA
- Series:
- SMAJ, TRANSIL™
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 48V
- Voltage - Breakdown (Min):
- 53.3V
- Voltage - Clamping (Max) @ Ipp:
- 100V
- Current - Peak Pulse (10/1000µs):
- 23A (8/20µs)
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ48CA-TR FAQ
1.How can I place an order for SMAJ48CA-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ48CA-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 SMAJ48CA-TR reliable?
The price and inventory of SMAJ48CA-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ48CA-TR is usually 5 days.
3.What payment methods are accepted for SMAJ48CA-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ48CA-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ48CA-TR?
SMAJ48CA-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ48CA-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 SMAJ48CA-TR?
For technical support, including SMAJ48CA-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ48CA-TR requirements.
6.How does Aetrix verify that SMAJ48CA-TR is sourced from the original manufacturer or authorized distributors?
All SMAJ48CA-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 SMAJ48CA-TR meets industry standards.
7.What is the process for return or replacement of SMAJ48CA-TR?
All SMAJ48CA-TR units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ48CA-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 SMAJ48CA-TR part is unused and in its original packaging.
Return procedure for SMAJ48CA-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ48CA-TR Tags
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