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STMicroelectronics SMAJ58A-TR
- Part No.:
- SMAJ58A-TR
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ58A-TR.pdf
- Description:
- TVS DIODE 58VWM 93.6VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:49,185
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Product details
Overview
SMAJ58A-TR from STMicroelectronics is a unidirectional 400 W transient voltage suppression diode designed for primary-level ESD and surge protection in DC power rails and signal lines. It features a 58 V stand-off voltage (VRM), 64.4 V minimum breakdown voltage (VBR), 93.6 V maximum clamping voltage (VCL) at 4.3 A IPP, and operates up to 150 °C junction temperature. It is commonly deployed in industrial power supplies and automotive body electronics to suppress IEC 61000-4-2 contact discharge (±30 kV) and IEC 61000-4-4 level 4 surges (4 kV).
For engineers reviewing the SMAJ58A-TR datasheet, SMAJ58A-TR pinout, SMAJ58A-TR application, or SMAJ58A-TR equivalent, key selection criteria include clamping voltage margin relative to protected IC VDD, leakage current at elevated temperature (≤1 µA @ 85 °C), thermal resistance under PCB copper area constraints, and compatibility with IPC-7531 SMA footprint.
Technical Context
This TVS diode uses planar silicon technology to achieve low leakage (<0.2 µA @ 25 °C) and stable VBR over temperature (αT = 10⁻⁴ /°C). Its unidirectional configuration enables asymmetric clamping-forward conduction during negative transients and reverse avalanche during positive surges-making it suitable for single-polarity rail protection without polarity reversal risk.
The device complies with JEDEC DO-214AC (SMA) mechanical outline and meets J-STD-020 MSL Level 1, enabling lead-free reflow without pre-baking. Its dynamic resistance (RD = 2.62 Ω) and pulse power derating curve (400 W @ 10/1000 µs, 121 W @ 8/20 µs) define real-world surge handling capability under varying waveform stress.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRM) | 58 V - Maximum continuous reverse operating voltage before significant leakage begins. |
| Breakdown Voltage (VBR) | 64.4–67.8 V @ 1 mA - Ensures reliable triggering above normal rail voltage with margin against false triggering. |
| Clamping Voltage (VCL) | 93.6 V @ 4.3 A (10/1000 µs) - Limits peak voltage seen by downstream circuitry during surge events. |
| Peak Pulse Power | 400 W (10/1000 µs) - Sustains typical lightning-induced surges per IEC 61000-4-5 Annex A. |
| Leakage Current | ≤0.2 µA @ 25 °C, ≤1 µA @ 85 °C - Minimizes standby power loss and avoids bias drift in high-impedance nodes. |
| Junction Temperature Range | −55 to +150 °C - Supports operation in under-hood automotive and industrial environments without derating. |
| ESD Robustness | ±30 kV (contact & air, IEC 61000-4-2) - Exceeds level 4 immunity requirements for human-body-model ESD. |
Pinout & Package
Package: SMA (DO-214AC), JEDEC-registered surface-mount outline with 2.25–2.90 mm body width (D), 4.80–5.35 mm length (E), and 0.75–1.50 mm lead length (L). Compliant with IPC-7531 footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (marked band) | Surge return path | Connected to system ground or low-impedance reference; conducts avalanche current during positive transients. |
| Anode | Protected line input | Connected to DC rail or signal line; blocks reverse current until VBR is exceeded. |
Key Features
| Feature | Design Value |
|---|---|
| Low-temperature coefficient of VBR | αT = 10⁻⁴ /°C - Enables predictable clamping across −55 to +150 °C without recalculating margins. |
| Planar junction construction | Reduces parasitic capacitance (<100 pF @ 0 V) and improves long-term reliability vs. alloyed junctions. |
| Matte tin-plated leads | Complies with J-STD-002, JESD 22-B102 E3, and MIL-STD-750 method 2026 - Ensures solderability and whisker resistance. |
| MSL Level 1 rating | No floor life limitation - Can be mounted directly after unpacking without baking, reducing manufacturing overhead. |
Applications
| Industrial Power Input Protection | Automotive Body Control Module |
|---|---|
Use Scenario: 24 V DC input stage of programmable logic controller (PLC) power supply exposed to load dump and inductive switching noise. IC Role / Device Role / Timing Role: Primary surge clamp on main DC bus, placed upstream of DC/DC converter input filter. Use Value: Clamps 4 kV IEC 61000-4-4 surges to <94 V, preventing overvoltage damage to input MOSFETs and controller ICs rated for 100 V max. | Use Scenario: LIN bus transceiver power rail (VBAT) in door module subjected to ISO 7637-2 pulse 1 and pulse 2a. IC Role / Device Role / Timing Role: Standby protection element parallel to LDO regulator input, activated only during transient overvoltage events. Use Value: Withstands 150 °C ambient under hood while maintaining <1 µA leakage, avoiding regulator dropout or thermal runaway. |
| Telecom Remote Power Feeding | Smart Energy Meter Interface |
Use Scenario: 48 V PoE-powered remote radio unit (RRU) front-end where DC feed line couples surge energy from antenna port. IC Role / Device Role / Timing Role: First-stage protector on DC input, coordinated with downstream GDT or polymer PTC for multi-stage clamping. Use Value: 400 W 10/1000 µs rating absorbs bulk surge energy before secondary protectors activate, extending system lifetime. | Use Scenario: RS-485 communication port powered from internal 5 V rail in utility meter, exposed to EFT bursts during grid switching. IC Role / Device Role / Timing Role: Low-capacitance shunt protector on VCC line feeding isolated transceiver, minimizing signal distortion. Use Value: Junction capacitance <50 pF @ 10 V ensures <1% signal attenuation at 1 MHz, preserving data integrity in 100 kbps metering networks. |
Availability
SMAJ58A-TR is available at Aetrix Electronics and suitable for industrial power input protection, automotive body control modules, telecom remote power feeding, and smart energy meter interfaces requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for SMAJ58A-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 microcontrollers, power devices, sensors, and analog ICs for industrial, automotive, and consumer applications.
The SMAJ series belongs to ST's transient protection portfolio, engineered specifically for robust, low-leakage DC rail protection in harsh environments where reliability and thermal stability are critical design constraints.
FAQ
What is the difference between SMAJ58A-TR and SMAJ58CA-TR?
SMAJ58A-TR is unidirectional, providing protection only against positive-going transients on a referenced rail, while SMAJ58CA-TR is bidirectional and protects both polarities-suitable for AC-coupled signals or floating buses. Their VBR, VCL, and power ratings are identical, but CA types exhibit symmetric clamping behavior and higher junction capacitance due to dual-junction structure.
Can SMAJ58A-TR be used in parallel for higher surge current handling?
No-parallel connection is not recommended due to mismatch in dynamic resistance (RD = 2.62 Ω) and VBR tolerance (±5%), which causes uneven current sharing and potential thermal runaway. For higher IPP, select a higher-rated part like SMAJ70A-TR or implement staged protection with a GDT upstream.
Does SMAJ58A-TR require a heatsink on standard FR4 PCB?
No external heatsink is required. With Rth(j-a) ≈ 120 °C/W on minimal copper (1 cm² per pad) and 400 W peak power applied for <1 ms, junction temperature rise remains within safe limits. Use ≥2.5 cm² total copper area per pad to maintain Tj <150 °C during repeated surges.
Is SMAJ58A-TR compliant with RoHS and REACH regulations?
Yes-SMAJ58A-TR carries ECOPACK2 certification, meeting RoHS Directive 2011/65/EU (Pb-free matte tin plating) and REACH SVHC thresholds. Full compliance documentation, including material declarations and test reports, is available via ST's quality portal using order code SMAJ58A-TR.
SMAJ58A-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):
- 58V
- Voltage - Breakdown (Min):
- 64.4V
- Voltage - Clamping (Max) @ Ipp:
- 93.6V
- Current - Peak Pulse (10/1000µs):
- 4.3A
- 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)
SMAJ58A-TR FAQ
1.How can I place an order for SMAJ58A-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ58A-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 SMAJ58A-TR reliable?
The price and inventory of SMAJ58A-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ58A-TR is usually 5 days.
3.What payment methods are accepted for SMAJ58A-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ58A-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ58A-TR?
SMAJ58A-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ58A-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 SMAJ58A-TR?
For technical support, including SMAJ58A-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ58A-TR requirements.
6.How does Aetrix verify that SMAJ58A-TR is sourced from the original manufacturer or authorized distributors?
All SMAJ58A-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 SMAJ58A-TR meets industry standards.
7.What is the process for return or replacement of SMAJ58A-TR?
All SMAJ58A-TR units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ58A-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 SMAJ58A-TR part is unused and in its original packaging.
Return procedure for SMAJ58A-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ58A-TR Tags
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