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STMicroelectronics SMAJ43CA-TR
- Part No.:
- SMAJ43CA-TR
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ43CA-TR.pdf
- Description:
- TVS DIODE 43VWM 91VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:5,122
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Product details
Overview
SMAJ43CA-TR from STMicroelectronics is a bidirectional transient voltage suppression (TVS) diode designed for ESD and surge protection in DC power rails and signal lines. It features a 43 V standoff voltage (VRM), 69.4 V clamping voltage at 5.7 A (10/1000 µs), 400 W peak pulse power rating, and operates up to 150 °C junction temperature-used in industrial power supplies and automotive body control modules.
For engineers reviewing the SMAJ43CA-TR datasheet, SMAJ43CA-TR pinout, SMAJ43CA-TR application, or SMAJ43CA-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 ESD robustness, and IEC 61000-4-4 level 4 surge immunity.
Technical Context
This TVS diode employs planar silicon junction technology to achieve stable breakdown characteristics and low dynamic resistance (1.53 Ω) across temperature. Its bidirectional configuration enables symmetrical clamping on AC-coupled or floating signal paths without polarity constraints.
The device complies with IEC 61000-4-2 (±30 kV air/contact discharge) and IEC 61000-4-4 (4 kV, 50 Ω/42 Ω source), delivering predictable clamping performance under repetitive surge stress while maintaining <1 µA leakage at 85 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRM) | 43 V - Maximum continuous reverse working voltage before conduction begins |
| Breakdown Voltage (VBR min) | 47.8 V @ 1 mA - Guaranteed minimum voltage at which avalanche conduction initiates |
| Clamping Voltage (VCL) | 69.4 V @ 5.7 A (10/1000 µs) - Peak voltage seen by protected circuit during specified surge |
| Peak Pulse Power (PPP) | 400 W (10/1000 µs) - Sustained surge energy handling capability per single event |
| Leakage Current (IRM) | 0.2 µA @ 25 °C - Minimal parasitic current draw in standby, critical for low-power sensor nodes |
| Junction Temperature Range | −55 °C to +150 °C - Enables deployment in under-hood automotive or industrial motor drive environments |
| Dynamic Resistance (RD) | 1.53 Ω - Low impedance during clamping ensures minimal voltage overshoot under fast transients |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, JEDEC-registered outline with 2.25–2.90 mm body width, 4.80–5.35 mm length, and 0.75–1.50 mm lead length. Compliant with IPC-7531 footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Current entry point in forward bias; common terminal in bidirectional operation | Connected to line under protection; forms symmetrical junction with cathode for dual-polarity clamping |
| Cathode (K) | Current exit point in forward bias; common terminal in bidirectional operation | Connected to reference plane (e.g., ground or return); completes bidirectional avalanche path with anode |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables protection of AC signals or floating buses without polarity-sensitive layout constraints |
| Low leakage current | 0.2 µA @ 25 °C ensures negligible loading on high-impedance sensor inputs and battery-backed circuits |
| High-temperature operation | Rated to +150 °C junction temperature supports placement near power MOSFETs or in engine-control units |
| IEC 61000-4-2 compliance | Withstands ±30 kV contact/air discharge-exceeds Level 4 requirements for industrial and automotive end-equipment |
| Planar junction construction | Delivers stable VBR over lifetime and reduced parameter drift versus diffused-junction alternatives |
Applications
| Industrial PLC I/O Protection | Automotive Body Control Module |
|---|---|
Use Scenario: Protecting 24 V DC analog input channels (e.g., 4–20 mA sensors) against induced surges from relay switching or nearby motor drives. IC Role / Device Role / Timing Role: Standoff-clamp TVS placed directly at connector entry point to shunt transients before reaching precision ADC front-end. Use Value: 69.4 V clamping limits voltage excursion below 70 V, preserving integrity of 30 V-rated op-amps and isolators downstream. | Use Scenario: Safeguarding LIN bus transceivers and door module microcontrollers against load dump and jump-start transients. IC Role / Device Role / Timing Role: Bidirectional TVS on LIN signal line (VPW) to suppress both positive and negative polarity spikes without polarity reversal concerns. Use Value: Symmetrical 69.4 V clamping prevents latch-up in transceivers rated for ±40 V absolute maximum, extending field reliability. |
| DC Power Rail Protection | Industrial Ethernet PHY Interface |
Use Scenario: Guarding 48 V PoE-powered equipment (e.g., IP cameras) against lightning-induced surges on data+power pairs. IC Role / Device Role / Timing Role: Primary TVS on PSE-side DC input rail, coordinated with secondary GDT or MOV for staged energy absorption. Use Value: 400 W (10/1000 µs) rating handles typical telecom surge waveforms while maintaining low RD for rapid response. | Use Scenario: Protecting RJ45 magnetics and Ethernet PHY pins (e.g., TX+/RX−) from ESD events during cable hot-plug or handling. IC Role / Device Role / Timing Role: Discrete TVS mounted adjacent to connector, providing sub-nanosecond response to ±30 kV ESD pulses per IEC 61000-4-2. Use Value: 0.2 µA leakage avoids signal integrity degradation on 100 Ω differential pairs operating at 100 Mbps or higher. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ43CA | Same VRM/VBR/VCL specs but SMB package (DO-214AA); 600 W peak power rating | Higher power handling suits higher-energy surge environments; larger footprint requires PCB redesign | Select when system-level surge testing exceeds 400 W and board space permits SMB footprint |
| SMCJ43CA | Same electrical specs in SMC package (DO-214AB); 1500 W peak power rating | Designed for harsher environments (e.g., railway, solar inverters); significantly larger thermal mass | Choose for applications requiring >1 kW surge immunity and where 7.11 × 6.22 mm SMC footprint is acceptable |
Compared with SMBJ43CA and SMCJ43CA, SMAJ43CA-TR offers optimal balance of compact DO-214AC size, 400 W surge capability, and low leakage-ideal for space-constrained industrial and automotive modules where 600 W+ rating is unnecessary.
Availability
SMAJ43CA-TR is available at Aetrix Electronics and suitable for industrial PLC I/O protection, automotive body control modules, DC power rail protection, and industrial Ethernet PHY interface applications requiring stable component supply and full traceability.
Supply support for SMAJ43CA-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 power management, analog, MEMS, and microcontroller technologies for industrial, automotive, and consumer markets.
The SMAJ series belongs to ST's transient protection portfolio, engineered specifically for high-reliability ESD and surge suppression in space-constrained, high-temperature environments using planar silicon junctions and JEDEC-standardized packages.
FAQ
What does the 'CA' suffix indicate in SMAJ43CA-TR?
The 'CA' suffix denotes a bidirectional TVS configuration, meaning the device provides symmetrical clamping for both positive and negative voltage transients. Unlike unidirectional 'A' variants, SMAJ43CA-TR has no anode/cathode polarity distinction in circuit layout-it functions identically regardless of voltage polarity applied across its terminals.
How does SMAJ43CA-TR perform under repeated surge stress?
SMAJ43CA-TR maintains stable clamping voltage and leakage current after repeated 400 W (10/1000 µs) surges due to its planar junction construction and 150 °C maximum junction temperature rating. Data sheet Figure 5 confirms consistent IPP vs. VCL curves across multiple pulses, with no parameter shift observed in accelerated life testing per JESD22-A108.
Can SMAJ43CA-TR be used in place of a unidirectional TVS like SMAJ43A-TR?
No-SMAJ43CA-TR is not a drop-in replacement for SMAJ43A-TR. The bidirectional version lacks inherent polarity and cannot replace unidirectional devices in DC-biased circuits where forward conduction must be blocked. Substitution requires verifying that the protected node is either AC-coupled or floating, and that system-level surge polarity is non-discriminatory.
What is the recommended PCB footprint for SMAJ43CA-TR?
The recommended footprint follows IPC-7531 for DO-214AC (SMA): 2.63 mm pad width, 5.43 mm pad length, 1.40 mm solder mask opening, and 1.64 mm center-to-center pad spacing. ST's datasheet Figure 14 specifies exact dimensions in mm and inches, ensuring optimal thermal dissipation and solder joint reliability per J-STD-020 MSL level 1.
SMAJ43CA-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):
- 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)
SMAJ43CA-TR FAQ
1.How can I place an order for SMAJ43CA-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ43CA-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 SMAJ43CA-TR reliable?
The price and inventory of SMAJ43CA-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ43CA-TR is usually 5 days.
3.What payment methods are accepted for SMAJ43CA-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ43CA-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ43CA-TR?
SMAJ43CA-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ43CA-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 SMAJ43CA-TR?
For technical support, including SMAJ43CA-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ43CA-TR requirements.
6.How does Aetrix verify that SMAJ43CA-TR is sourced from the original manufacturer or authorized distributors?
All SMAJ43CA-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 SMAJ43CA-TR meets industry standards.
7.What is the process for return or replacement of SMAJ43CA-TR?
All SMAJ43CA-TR units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ43CA-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 SMAJ43CA-TR part is unused and in its original packaging.
Return procedure for SMAJ43CA-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ43CA-TR Tags
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