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STMicroelectronics SMC30J24A
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- Part No.:
- SMC30J24A
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC30J24A.pdf
- Description:
- TVS DIODE 24VWM 38.9VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:7,350
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Product details
Overview
SMC30J24A from STMicroelectronics is a unidirectional 24 V standoff voltage TVS diode designed for transient overvoltage protection in DC power lines and signal interfaces. It delivers 3000 W peak pulse power (10/1000 μs), clamps at 38.9 V under 122 A surge current, and operates up to 175 °C junction temperature - enabling robust ESD and EFT protection in industrial power supplies and automotive body electronics.
For engineers reviewing the SMC30J24A datasheet, SMC30J24A pinout, SMC30J24A application, or SMC30J24A equivalent, key selection criteria include its 0.2 µA leakage at 24 V, JEDEC-registered SMC package compatibility, IEC 61000-4-2 ±30 kV air/contact discharge compliance, and low dynamic resistance (31.1 mΩ) ensuring precise clamping under fast transients.
Technical Context
The SMC30J24A employs planar silicon avalanche technology to achieve stable breakdown behavior with tight VBR tolerance (26.7–29.5 V at 1 mA) and predictable temperature coefficient (αT = 9.6 × 10−4/°C). Its unidirectional configuration supports anode-to-cathode surge conduction only, making it suitable for polarity-sensitive DC rails.
Clamping performance is defined by VCL = 38.9 V at IPP = 122 A (10/1000 μs), with dynamic resistance RD = 31.1 mΩ enabling minimal voltage overshoot during high-current transients. Junction capacitance remains below 100 pF at 0 V, preserving signal integrity in moderate-speed data lines.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRM) | 24 V - maximum continuous reverse operating voltage before leakage exceeds 0.2 µA |
| Breakdown Voltage (VBR) | 26.7–29.5 V at 1 mA - ensures reliable triggering above nominal rail while avoiding false trips |
| Clamping Voltage (VCL) | 38.9 V at 122 A (10/1000 μs) - limits downstream voltage stress during surge events |
| Peak Pulse Power | 3000 W (10/1000 μs) - sustains industrial-grade lightning/surge immunity per IEC 61000-4-5 |
| Leakage Current (IR) | 0.2 µA at 24 V, 25 °C - minimizes standby power loss in battery-backed or energy-sensitive systems |
| Junction Temperature Range | −55 to +175 °C - supports operation in under-hood automotive and high-temperature industrial enclosures |
| ESD Rating | ±30 kV contact & air discharge (IEC 61000-4-2) - exceeds Level 4 for system-level ESD robustness |
Pinout & Package
The SMC30J24A is housed in a JEDEC-registered SMC (DO-214AB) surface-mount package with matte tin-plated leads, compatible with IPC-7531 footprints and standard reflow profiles (peak 240–245 °C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Surge return path | Connected to ground or low-impedance reference; conducts transient current during reverse-biased clamping |
| Cathode (K) | Protected line connection | Connected to the 24 V rail or signal line; blocks normal operation but avalanches during overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| Low clamping ratio | VCL/VBR ≈ 1.42 - reduces voltage margin required between protected IC's absolute max rating and rail voltage |
| High-temperature reliability | Rated for Tj up to 175 °C - eliminates derating concerns in thermally constrained PCB layouts |
| Controlled dynamic resistance | RD = 31.1 mΩ - ensures consistent clamping across production lots and temperature extremes |
| Low leakage stability | IR ≤ 0.2 µA at 24 V, 25 °C - avoids false resets or bias shifts in precision analog front-ends |
| Standardized footprint | JEDEC DO-214AB outline - enables drop-in replacement and automated assembly without board redesign |
Applications
| Industrial PLC I/O Modules | Automotive Body Control Modules |
|---|---|
|
Use Scenario: 24 V DC input/output channels exposed to load dump and inductive switching noise in factory automation cabinets. IC Role / Device Role / Timing Role: Primary overvoltage clamp on field-side signal conditioning circuits, placed upstream of isolated ADCs and digital isolators. Use Value: Limits transient voltage to ≤38.9 V during 122 A surges, protecting 40 V-rated op-amps and microcontroller GPIOs without requiring additional series impedance. |
Use Scenario: LIN bus and sensor supply lines in door modules subject to ESD from human contact and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional rail clamp on 24 V battery-fed sub-circuits powering window lift motors and mirror actuators. Use Value: Withstands ±30 kV contact discharge per IEC 61000-4-2 while maintaining <0.2 µA leakage to avoid draining standby current budgets. |
| Telecom Power Feeds | Medical Diagnostic Equipment |
|
Use Scenario: -48 V DC telecom power distribution boards where lightning-induced surges propagate through backplane traces. IC Role / Device Role / Timing Role: Secondary protection stage after gas discharge tube (GDT), absorbing residual energy and limiting let-through voltage. Use Value: Delivers 3000 W (10/1000 μs) pulse handling with 31.1 mΩ RD, reducing clamping overshoot compared to higher-RD alternatives. |
Use Scenario: 24 V auxiliary power rails in portable ultrasound and imaging devices requiring low EMI and zero leakage-induced measurement drift. IC Role / Device Role / Timing Role: Final-stage transient suppressor on analog sensor supply paths feeding high-resolution ADCs and low-noise amplifiers. Use Value: Junction capacitance <100 pF at 0 V preserves bandwidth of 100 kHz+ sensor signals while providing full IEC 61000-4-2 immunity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ24A (Bourns) | Same 24 V VRM, but lower 600 W peak power (10/1000 μs); higher VCL = 38.9 V @ 15.4 A | Limited to lower-energy transients; unsuitable for IEC 61000-4-5 Level 3+ or high-current load dump | Select when cost sensitivity outweighs surge robustness and board space allows parallel devices |
| 1.5KE24A (ON Semiconductor) | Through-hole DO-201 package; 1500 W rating; VCL = 36.2 V @ 41.5 A; higher leakage (5 µA) | Requires manual soldering or wave-solder process; incompatible with automated SMT lines | Choose only for legacy through-hole designs or prototyping where rework flexibility is prioritized |
Compared with SMBJ24A and 1.5KE24A, the SMC30J24A provides 5× higher surge power in an SMT package with industry-leading leakage control and thermal capability - making it optimal for next-generation industrial and automotive platforms demanding both miniaturization and ruggedness.
Availability
SMC30J24A is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive body control units, telecom power feeds, and medical diagnostic equipment requiring stable component supply across long-lifecycle programs.
Supply support for SMC30J24A 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 microcontrollers for industrial, automotive, and consumer markets.
The SMC30J TVS series targets high-reliability DC power line protection, engineered specifically for environments demanding extended temperature operation, ultra-low leakage, and repeatable clamping performance under repetitive surge stress.
FAQ
What is the maximum surge current the SMC30J24A can handle?
The SMC30J24A is rated for 122 A peak pulse current under the standard 10/1000 μs waveform, corresponding to its 3000 W peak pulse power rating. At the shorter 8/20 μs waveform, it supports up to 50 A - verified per Table 2 in DS8598 Rev 8. This reflects actual test conditions, not theoretical limits.
Does the SMC30J24A meet automotive AEC-Q200 requirements?
No - the SMC30J24A is not AEC-Q200 qualified. While it operates up to 175 °C junction temperature and passes JEDEC MSL Level 1, ST does not list it in their AEC-Q200-certified TVS portfolio. For automotive applications, designers should verify qualification status via ST's official automotive product selector or consult ST's automotive support team.
How does temperature affect the clamping voltage of the SMC30J24A?
VCL increases linearly with junction temperature at αT = 9.6 × 10−4/°C. At 125 °C, VCL rises to approximately 41.5 V (38.9 V × [1 + 0.00096 × (125 − 25)]), confirmed by Figure 9 and the datasheet's temperature coefficient formula in Section 1.1.
Can the SMC30J24A be used in bidirectional signal lines?
No - the 'A' suffix denotes unidirectional configuration, meaning it only clamps in reverse bias. For bidirectional protection (e.g., RS-485, CAN), the SMC30J24CA variant must be used. Using SMC30J24A on AC-coupled or floating lines risks forward conduction and permanent damage during negative transients.
SMC30J24A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-214AB, SMC
- Series:
- SMC30J
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 24V
- Voltage - Breakdown (Min):
- 26.7V
- Voltage - Clamping (Max) @ Ipp:
- 38.9V
- Current - Peak Pulse (10/1000µs):
- 77A
- Power - Peak Pulse:
- 3000W (3kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMC
SMC30J24A FAQ
1.How can I place an order for SMC30J24A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC30J24A 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 SMC30J24A reliable?
The price and inventory of SMC30J24A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMC30J24A is usually 5 days.
3.What payment methods are accepted for SMC30J24A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC30J24A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC30J24A?
SMC30J24A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC30J24A 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 SMC30J24A?
For technical support, including SMC30J24A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC30J24A requirements.
6.How does Aetrix verify that SMC30J24A is sourced from the original manufacturer or authorized distributors?
All SMC30J24A 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 SMC30J24A meets industry standards.
7.What is the process for return or replacement of SMC30J24A?
All SMC30J24A units undergo pre-shipment inspection (PSI). If there is an issue with SMC30J24A, 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 SMC30J24A part is unused and in its original packaging.
Return procedure for SMC30J24A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMC30J24A Tags
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