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STMicroelectronics SMAJ58CA-TR
- Part No.:
- SMAJ58CA-TR
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ58CA-TR.pdf
- Description:
- TVS DIODE 58VWM 121VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:51,900
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Product details
Overview
SMAJ58CA-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 58 V standoff voltage (VRM), 93.6 V maximum clamping voltage at 4.3 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 SMAJ58CA-TR datasheet, SMAJ58CA-TR pinout, SMAJ58CA-TR application, or SMAJ58CA-TR equivalent, key selection criteria include bidirectional clamping behavior, low leakage (<0.2 µA @ 25 °C), JEDEC DO-214AC (SMA) package compatibility, and IEC 61000-4-2/4-4 compliance for system-level EMC robustness.
Technical Context
This TVS diode uses planar silicon junction technology to achieve stable breakdown characteristics and low dynamic resistance (2.62 Ω at 8/20 µs). Its bidirectional configuration enables symmetrical clamping on AC-coupled or floating signal paths without polarity constraints.
The device meets IEC 61000-4-2 level 4 (30 kV air/contact discharge) and IEC 61000-4-4 level 4 (4 kV), with thermal performance validated per JESD22-A104 and solderability compliant to J-STD-020 MSL level 1 - supporting reflow assembly without derating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRM) | 58 V - maximum continuous reverse operating voltage before significant leakage or conduction begins |
| Breakdown Voltage (VBR) | 64.4–67.8 V at 1 mA - ensures reliable triggering margin above normal rail voltage |
| Clamping Voltage (VCL) | 93.6 V at 4.3 A (10/1000 µs) - limits transient overvoltage seen by downstream ICs |
| Peak Pulse Power (PPP) | 400 W (10/1000 µs) - sustains standard lightning-surge energy without failure |
| Leakage Current (IRM) | ≤0.2 µA at 25 °C - minimizes standby power loss in battery-backed systems |
| Junction Temperature Range | −55 to +150 °C - supports operation in under-hood automotive and industrial enclosures |
| Dynamic Resistance (RD) | 2.62 Ω (8/20 µs) - determines voltage overshoot during fast transients |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, JEDEC-registered outline with matte tin-plated leads; compatible with IPC-7531 footprint (5.43 mm × 2.63 mm pad pitch).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (K) | Reference terminal for unidirectional devices; symmetrical in bidirectional | In SMAJ58CA-TR, both terminals are functionally identical - no polarity marking required for clamping |
| Anode (A) | Reference terminal for unidirectional devices; symmetrical in bidirectional | Terminal pair forms a back-to-back Zener structure enabling bidirectional surge clamping |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables protection of AC signals or floating buses without orientation sensitivity during placement |
| Low leakage current | 0.2 µA max at 25 °C ensures minimal impact on high-impedance sensor bias networks |
| High-temperature operation | Rated to 150 °C junction temperature supports use near power converters and motor drivers |
| IEC 61000-4-2/4-4 compliance | Validated 30 kV ESD and 4 kV EFT immunity eliminates need for external test validation |
| Planar junction construction | Delivers consistent VBR tolerance and long-term stability under thermal cycling stress |
Applications
| Industrial PLC I/O Protection | Automotive Body Control Module |
|---|---|
Use Scenario: Protecting 24 V digital input channels against load dump and inductive switching transients. IC Role / Device Role / Timing Role: Standoff-clamp TVS placed directly at connector entry point to shunt surges before reaching MCU GPIO or optocoupler inputs. Use Value: 93.6 V clamping ensures downstream 3.3 V/5 V logic remains below absolute maximum ratings during 400 W surges. | Use Scenario: Safeguarding LIN bus transceivers and door module sensors from battery line disturbances. IC Role / Device Role / Timing Role: Bidirectional clamp across VBAT and GND to suppress ±100 V spikes from alternator load dump or jump-start events. Use Value: Symmetrical clamping prevents reverse-bias damage to sensitive analog front-ends without requiring dual-device placement. |
| DC Power Rail Protection | Telecom Interface Surge Suppression |
Use Scenario: Securing 48 V PoE-powered equipment inputs against Ethernet cable-induced surges. IC Role / Device Role / Timing Role: Primary TVS on DC input rail upstream of DC-DC converter, sized for 10/1000 µs waveform energy. Use Value: 400 W rating handles typical telecom surge test profiles while maintaining <100 V clamping to protect 60 V-rated MOSFETs. | Use Scenario: Hardening RS-485 transceiver data lines against induced lightning surges in outdoor base stations. IC Role / Device Role / Timing Role: Bidirectional TVS across differential pair (A/B) referenced to local ground plane. Use Value: Low capacitance (~100 pF at 0 V) avoids signal integrity degradation at 10 Mbps data rates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ58CA-TR | Same VRM/VBR/VCL but 600 W (10/1000 µs) rating; larger SMB package (DO-214AA) | Higher surge margin for harsher environments; requires larger PCB footprint | Select when 600 W surge immunity is mandated and board space permits SMB layout |
| 1.5KE58CA | Through-hole TO-204AA (DO-41); same 58 V VRM but higher 1500 W rating and 100 ns response | Not SMT-compatible; used in legacy or high-reliability through-hole designs | Choose only for manual assembly or where leaded mounting is required by safety certification |
Compared with SMBJ58CA-TR and 1.5KE58CA, SMAJ58CA-TR delivers optimal balance of 400 W surge capability, compact DO-214AC footprint, and full IEC 61000-4-2/4-4 compliance - making it ideal for space-constrained, high-volume SMT applications where 600 W headroom is unnecessary.
Availability
SMAJ58CA-TR is available at Aetrix Electronics and suitable for industrial PLC I/O protection, automotive body control modules, DC power rail hardening, and telecom interface surge suppression requiring stable component supply and full traceability.
Supply support for SMAJ58CA-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, delivering intelligent power, sensing, and control solutions across automotive, industrial, and consumer markets.
SMAJxxCA belongs to ST's standardized TVS diode portfolio targeting board-level ESD/surge protection - engineered for reliability in harsh environments and seamless integration into automated SMT assembly lines.
FAQ
What is the difference between SMAJ58CA-TR and SMAJ58A-TR?
SMAJ58CA-TR is bidirectional (symmetrical clamping for both polarities), while SMAJ58A-TR is unidirectional (clamps only in reverse bias). The 'CA' suffix denotes bidirectional functionality, critical for AC-coupled or floating signal lines where polarity cannot be guaranteed during surge events.
Can SMAJ58CA-TR be used on a 48 V DC rail?
Yes - its 58 V standoff voltage provides 10 V margin above nominal 48 V, ensuring stable non-conduction during normal operation. Clamping at 93.6 V protects downstream components rated for ≤100 V, such as many 60 V MOSFETs and DC-DC controllers.
Does this device meet automotive AEC-Q200 requirements?
No - SMAJ58CA-TR is not AEC-Q200 qualified. While it operates up to 150 °C and passes JEDEC reliability tests, ST does not certify this series for automotive-grade qualification. For AEC-Q200 applications, consider ST's Automotive TVS family (e.g., SMAJ58CA-Q).
What is the recommended PCB footprint for SMAJ58CA-TR?
The official IPC-7531-compliant footprint specifies 5.43 mm pad-to-pad length, 2.63 mm pad width, and 1.40 mm pad thickness - matching JEDEC DO-214AC (SMA) mechanical dimensions. Thermal relief and copper pour under the device improve power dissipation during surge events.
SMAJ58CA-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):
- 58V
- Voltage - Breakdown (Min):
- 64.4V
- Voltage - Clamping (Max) @ Ipp:
- 121V
- Current - Peak Pulse (10/1000µs):
- 19A (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)
SMAJ58CA-TR FAQ
1.How can I place an order for SMAJ58CA-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ58CA-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 SMAJ58CA-TR reliable?
The price and inventory of SMAJ58CA-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ58CA-TR is usually 5 days.
3.What payment methods are accepted for SMAJ58CA-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ58CA-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ58CA-TR?
SMAJ58CA-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ58CA-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 SMAJ58CA-TR?
For technical support, including SMAJ58CA-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ58CA-TR requirements.
6.How does Aetrix verify that SMAJ58CA-TR is sourced from the original manufacturer or authorized distributors?
All SMAJ58CA-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 SMAJ58CA-TR meets industry standards.
7.What is the process for return or replacement of SMAJ58CA-TR?
All SMAJ58CA-TR units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ58CA-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 SMAJ58CA-TR part is unused and in its original packaging.
Return procedure for SMAJ58CA-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ58CA-TR Tags
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