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STMicroelectronics SMAJ43A-TR
- Part No.:
- SMAJ43A-TR
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ43A-TR.pdf
- Description:
- TVS DIODE 43VWM 91VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:34,801
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Product details
Overview
SMAJ43A-TR from STMicroelectronics is a unidirectional transient voltage suppression (TVS) diode designed for primary-level ESD and surge protection in DC power rails and signal lines. It features a 43 V stand-off voltage (VRM), 69.4 V maximum clamping voltage at 5.7 A (10/1000 µs), 400 W peak pulse power rating, and operates up to +150 °C junction temperature-ideal for automotive body electronics and industrial I/O interfaces.
For engineers reviewing the SMAJ43A-TR datasheet, SMAJ43A-TR pinout, SMAJ43A-TR application, or SMAJ43A-TR equivalent, key selection criteria include clamping voltage margin vs. protected IC VDD, leakage current at elevated temperature, JEDEC DO-214AC (SMA) package thermal performance, and IEC 61000-4-2/4-4 compliance level.
Technical Context
This device implements a planar silicon avalanche structure optimized for low dynamic resistance (1.53 Ω) and stable breakdown behavior across temperature. Its unidirectional configuration provides asymmetric conduction-low forward voltage (<3.5 V at 1 A) during fault conditions while maintaining sub-0.2 µA reverse leakage at 25 °C and <1 µA at 85 °C.
The SMAJ43A-TR meets IEC 61000-4-2 Level 4 (±30 kV air/contact discharge) and IEC 61000-4-4 Level 4 (4 kV), with clamping performance validated under both 10/1000 µs (400 W) and 8/20 µs (2.3 kW) surge waveforms-enabling robust protection without sacrificing signal integrity in high-reliability 24–48 V systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRM) | 43 V - Maximum continuous reverse operating voltage before breakdown; sets minimum system rail margin. |
| Breakdown Voltage (VBR) | 47.8–50.3 V at 1 mA - Confirmed avalanche initiation range; ensures predictable turn-on during transients. |
| Clamping Voltage (VCL) | 69.4 V at 5.7 A (10/1000 µs) - Peak voltage seen by protected circuit during worst-case surge; defines safe overvoltage headroom. |
| Peak Pulse Power (PPP) | 400 W (10/1000 µs) - Sustained energy-handling capability for standard lightning/surge events per IEC 61000-4-5. |
| Leakage Current (IRM) | ≤0.2 µA at 25 °C, ≤1 µA at 85 °C - Ensures minimal standby power loss and signal path interference in battery-powered or precision analog circuits. |
| Junction Temperature Range | −55 to +150 °C - Enables deployment in under-hood automotive, industrial motor drives, and outdoor telecom equipment. |
| Package | DO-214AC (SMA) - Standardized surface-mount outline per IPC-7531; supports automated assembly and thermal relief via copper pour under pads. |
Pinout & Package
DO-214AC (SMA) package: 2-terminal surface-mount device with cathode band marking; dimensions per JEDEC MS-013 (EIAJ ED-732AA), footprint compliant with IPC-7531. Thermal performance optimized for FR4 PCBs with ≥1.4 cm² copper area per pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference node | Connected to ground or lowest potential point; establishes return path for surge current. |
| Cathode | Protected line input | Connected to line being protected (e.g., 48 V supply rail); avalanche conduction occurs when voltage exceeds VRM. |
Key Features
| Feature | Design Value |
|---|---|
| Low clamping ratio (VCL/VBR ≈ 1.45) | Minimizes overvoltage stress on downstream ICs-critical for 5 V tolerant microcontrollers on 48 V bus interfaces. |
| High-temperature leakage stability | Sub-1 µA leakage at 85 °C enables reliable operation in engine control units without thermal runaway risk. |
| JEDEC-registered DO-214AC outline | Ensures mechanical compatibility with standard SMA pick-and-place nozzles and reflow profiles (J-STD-020 MSL Level 1). |
| IEC 61000-4-2/4-4 Level 4 compliance | Validated protection against real-world ESD events (±30 kV) and fast-rise surges (4 kV), reducing need for secondary filtering. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input |
|---|---|
Use Scenario: Protecting 24 V CAN transceiver power pins against load dump and jump-start transients. IC Role / Device Role / Timing Role: Primary TVS clamp on VCC rail; responds within nanoseconds to limit voltage excursion below 70 V. Use Value: Prevents latch-up or permanent damage to ISO 11898-compliant transceivers during 12 V system faults. | Use Scenario: Safeguarding 24 V digital input channels from field-wiring induced surges in factory automation. IC Role / Device Role / Timing Role: First-line transient suppressor before optocoupler input stage; clamps 4 kV IEC 61000-4-4 bursts. Use Value: Eliminates false triggering and extends optocoupler lifetime in dusty, high-noise environments. |
| Telecom Remote Radio Unit (RRU) | Smart Energy Meter Power Supply |
Use Scenario: Shielding 48 V DC feed lines in outdoor base station cabinets from lightning-induced surges. IC Role / Device Role / Timing Role: Unidirectional TVS on PoE-like power input; handles repetitive 10/1000 µs surges up to 400 W. Use Value: Maintains uptime by preventing power module shutdown during localized atmospheric discharges. | Use Scenario: Securing AC/DC adapter output rails against grid switching transients in residential metering. IC Role / Device Role / Timing Role: Secondary surge clamp after MOV; provides precise 69.4 V clamping to protect MCU and RTC backup circuitry. Use Value: Guarantees accurate timekeeping and firmware integrity during brownout recovery sequences. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ43A from Vishay (SMCJ43A) | Same DO-214AC package, identical VRM/VBR specs, but higher VCL (70.1 V) and RD (1.65 Ω) | Slightly reduced overvoltage margin; may require layout review for sensitive 3.3 V logic interfaces | Select if sourcing diversification is prioritized and clamping margin >0.7 V remains acceptable |
| P6SMB43A from ON Semiconductor | Same VRM, but lower PPP (600 W), higher IRM (1 µA at 25 °C), and larger DO-214AA package | Less suitable for space-constrained designs; requires revised PCB footprint and thermal relief | Choose only when legacy P6SMB footprint compatibility is mandatory and 600 W surge headroom is needed |
Compared with SMAJ43A-TR, the Vishay SMCJ43A offers equivalent form-factor and voltage ratings but trades 0.7 V higher clamping for broader supply chain access, while the ON Semiconductor P6SMB43A sacrifices miniaturization and leakage performance for higher single-pulse energy handling-making ST's part optimal for thermally dense, low-leakage 48 V embedded systems.
Availability
SMAJ43A-TR is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC I/O modules, telecom remote radio units, and smart energy metering systems requiring stable component supply and full IEC 61000-4-2/4-4 compliance.
Supply support for SMAJ43A-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, specializing in automotive, industrial, and power management solutions with vertical manufacturing capabilities and broad IP portfolio.
The SMAJ series belongs to ST's Transient Voltage Suppressor product line, engineered specifically for high-reliability DC rail protection where low leakage, tight clamping, and extended temperature operation are critical-targeting automotive, industrial, and infrastructure applications.
FAQ
What is the maximum surge current the SMAJ43A-TR can handle?
The SMAJ43A-TR sustains 5.7 A under the standard 10/1000 µs waveform (IEC 61000-4-5) and 91 A under the faster 8/20 µs waveform (IEC 61000-4-4). These values are measured at Tj = 25 °C with proper PCB copper thermal relief; derating applies above 85 °C ambient.
Is SMAJ43A-TR RoHS and REACH compliant?
Yes-SMAJ43A-TR carries STMicroelectronics' ECOPACK2 certification, meeting RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006. Lead finish is matte tin, and halogen-free epoxy molding compound is used per IEC 61249-2-21.
Can SMAJ43A-TR be used in bidirectional configurations?
No-SMAJ43A-TR is strictly unidirectional. For bidirectional protection, use SMAJ43CA (same voltage ratings, symmetrical breakdown). Mixing A and CA types in the same circuit risks improper clamping or catastrophic failure due to polarity mismatch.
What is the recommended PCB footprint for SMAJ43A-TR?
ST specifies a 5.43 mm × 2.63 mm pad layout with 1.40 mm solder mask opening per terminal (Figure 14, DS1251 Rev 15). Minimum 1.4 cm² copper area per pad is required to achieve rated 400 W pulse power; thermal vias to inner ground planes further improve reliability.
SMAJ43A-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:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 43V
- Voltage - Breakdown (Min):
- 47.8V
- Voltage - Clamping (Max) @ Ipp:
- 91V
- Current - Peak Pulse (10/1000µs):
- 25A (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)
SMAJ43A-TR FAQ
1.How can I place an order for SMAJ43A-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ43A-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 SMAJ43A-TR reliable?
The price and inventory of SMAJ43A-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ43A-TR is usually 5 days.
3.What payment methods are accepted for SMAJ43A-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ43A-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ43A-TR?
SMAJ43A-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ43A-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 SMAJ43A-TR?
For technical support, including SMAJ43A-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ43A-TR requirements.
6.How does Aetrix verify that SMAJ43A-TR is sourced from the original manufacturer or authorized distributors?
All SMAJ43A-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 SMAJ43A-TR meets industry standards.
7.What is the process for return or replacement of SMAJ43A-TR?
All SMAJ43A-TR units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ43A-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 SMAJ43A-TR part is unused and in its original packaging.
Return procedure for SMAJ43A-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ43A-TR Tags
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