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onsemi SMCJ30A
- Part No.:
- SMCJ30A
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ30A.pdf
- Description:
- TVS DIODE 30VWM 48.4VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:26,524
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Product details
Overview
SMCJ30A from ON Semiconductor is a unidirectional transient voltage suppressor (TVS) diode designed for primary-level overvoltage protection in DC power lines and signal interfaces. It features a 30 V reverse stand-off voltage (VRWM), 33.3–36.8 V breakdown voltage (VBR) at 1 mA, 48.4 V clamping voltage (VC) at 31.0 A peak pulse current, and 1500 W peak pulse power dissipation on a 10/1000 μs waveform - deployed in industrial motor drives to protect gate drivers from IGBT switching transients.
For engineers reviewing the SMCJ30A datasheet, pinout, applications, or equivalent options, key selection criteria include verified clamping performance under 10/1000 μs surge, low leakage (<5 μA at VRWM), UL94V-0 flammability rating, and DO-214AB package compatibility with high-power PCB layouts requiring thermal robustness and fast response time (<1.0 ps).
Technical Context
The SMCJ30A employs a glass-passivated junction structure enabling stable avalanche breakdown behavior and low incremental surge resistance. Its unidirectional polarity ensures asymmetric conduction - forward-biased operation supports surge shunting only during negative transients relative to cathode, while reverse-biased blocking maintains integrity up to 30 V DC operating voltage.
Designed for single-pulse transient suppression per JEDEC standards, it delivers 1500 W peak power handling with 163 A maximum non-repetitive peak forward surge current (IFSM) and operates reliably from –55 °C to +150 °C junction temperature. Response time is typically less than 1.0 ps from 0 V to VBR minimum, ensuring sub-nanosecond reaction to ESD and lightning-induced surges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 30 V - Maximum continuous reverse operating voltage before clamping initiates; defines safe DC bias margin in protected circuits. |
| VBR (min/max) | 33.3 V / 36.8 V at 1 mA - Confirmed avalanche onset range; ensures predictable turn-on across process variation and temperature. |
| VC @ IPPM | 48.4 V at 31.0 A - Clamped voltage during full 1500 W surge; determines maximum stress imposed on downstream ICs. |
| PPPM | 1500 W on 10/1000 μs waveform - Peak transient energy absorption capability; validates suitability for IEC 61000-4-5 Level 4 compliance testing. |
| IR @ VRWM | <5 μA - Reverse leakage current at rated stand-off voltage; minimizes standby power loss and avoids false triggering in high-impedance nodes. |
| Response Time | <1.0 ps - Time from 0 V to VBR minimum under unidirectional surge; enables protection of nanosecond-edge digital and analog signals. |
| Package | DO-214AB (SMC) - Surface-mount outline with 7.11 mm × 6.22 mm footprint and 2.3 mm height; optimized for thermal dissipation in high-current PCB traces. |
Pinout & Package
SMCJ30A uses the DO-214AB (SMC) surface-mount package with two terminals: anode and cathode. A visible color band on the body identifies the cathode end for unidirectional polarity orientation during placement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during forward conduction | Connected to system ground or lower-potential rail; completes surge path when cathode is at higher potential. |
| Cathode | Current exit point during reverse-biased clamping | Connected to protected line (e.g., 24 V supply rail); conducts avalanche current to ground when transient exceeds VRWM. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Enables stable, repeatable avalanche characteristics over 1000+ surge events without parameter drift or degradation. |
| 1500 W peak pulse power | Supports single-event surge immunity up to IEC 61000-4-5 4 kV (line-earth) and 2 kV (line-line) test levels without failure. |
| Clamping ratio VC/VBR | 1.45 typical (48.4 V / 33.3 V) - Low ratio ensures minimal overvoltage overshoot during clamping, preserving downstream component margins. |
| UL94V-0 flammability rating | Confirms polymer encapsulation meets stringent flame-retardant requirements for industrial and transportation equipment enclosures. |
| JEDEC-compliant IFSM | 200 A non-repetitive forward surge rating - Validates robustness against accidental short-circuit or inrush current events during system startup. |
Applications
| Industrial Motor Drives | DC Power Input Protection |
|---|---|
|
Use Scenario: Protecting gate driver ICs and isolated power supplies from IGBT switching transients and inductive kickback in 3-phase inverters. IC Role / Device Role / Timing Role: Primary-level TVS device placed directly at power input stage to clamp fast-rising dV/dt spikes before they reach sensitive control circuitry. Use Value: Limits transient voltage to ≤48.4 V during 31 A surges, preventing latch-up or oxide breakdown in 5 V/3.3 V logic interfaces tied to gate drivers. |
Use Scenario: Safeguarding 24 V DC input rails in programmable logic controllers (PLCs) against load dump and hot-swap surges. IC Role / Device Role / Timing Role: Standoff-rated protector operating continuously at 30 V, activating only during >33.3 V transients with sub-ns response. Use Value: Maintains <5 μA leakage at nominal 24 V, eliminating measurable standby current penalty while delivering 1500 W surge headroom. |
| Telecom Power Feeds | Automotive Body Control Modules |
|
Use Scenario: Securing PoE-powered remote radio units (RRUs) against induced surges from nearby lightning strikes on outdoor cabling. IC Role / Device Role / Timing Role: Unidirectional shunt element on 48 V phantom power line, referenced to local ground plane with minimal trace inductance. Use Value: Achieves 48.4 V clamping at 31 A, aligning with IEEE 802.3bt Type 4 PoE voltage limits and preserving PHY IC tolerance margins. |
Use Scenario: Protecting LIN bus transceivers and microcontroller I/O pins in BCMs exposed to battery disconnect transients and alternator load dump. IC Role / Device Role / Timing Role: Secondary-level protector downstream of primary fuses, sized for localized surge suppression near connector entry points. Use Value: Responds in <1.0 ps to 100 V/100 ns transients, limiting voltage excursion to safe levels before transceiver ESD structures activate. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC30A (Littelfuse) | Same 30 V VRWM and 48.4 V VC, but rated for 1.5 kW on 10/1000 μs; slightly higher IR (10 μA max) and different DO-214AB mechanical tolerances. | Approved for automotive AEC-Q101 qualification; suitable where extended temperature validation or PPAP documentation is required. | Select SAC30A when automotive-grade qualification or tighter IR consistency across lot batches is mandatory. |
| 1.5KE30A (ON Semiconductor) | Same electrical specs but in larger DO-201AD package; 2.5× higher thermal mass but 30% larger PCB footprint and slower thermal recovery. | Better suited for infrequent, high-energy surges in legacy industrial designs where board space is not constrained. | Choose 1.5KE30A only if existing layout accommodates axial-leaded packages or thermal cycling demands exceed SMCJ series capability. |
Compared with SAC30A and 1.5KE30A, the SMCJ30A offers optimal balance of compact DO-214AB footprint, sub-ns response, and industrial-grade reliability - making it preferred for space-constrained, high-density motor control and telecom power modules where layout efficiency and surge timing precision are critical.
Availability
SMCJ30A is available at Aetrix Electronics and suitable for industrial motor drives, DC power input protection, telecom power feeds, and automotive body control modules requiring stable component supply, consistent parametric performance, and long-term lifecycle support.
Supply support for SMCJ30A 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
ON Semiconductor is a global semiconductor manufacturer specializing in power management, analog, sensor, and discrete solutions for automotive, industrial, cloud computing, and IoT applications.
The SMCJ series belongs to ON Semiconductor's transient voltage suppression portfolio, engineered specifically for high-power, fast-response overvoltage protection in harsh electromagnetic environments - targeting industrial automation, renewable energy systems, and infrastructure equipment.
FAQ
What is the maximum clamping voltage of the SMCJ30A under a 10/1000 μs surge?
The SMCJ30A exhibits a maximum clamping voltage (VC) of 48.4 V when subjected to its rated peak pulse current of 31.0 A on a 10/1000 μs waveform. This value is measured per standard test conditions (TA = 25 °C) and represents the upper limit of voltage seen by downstream circuitry during full-power transient events. The SMCJ30A maintains this clamping performance consistently across its qualified operating temperature range.
Is the SMCJ30A unidirectional or bidirectional, and how is polarity identified?
The SMCJ30A is a unidirectional TVS diode, meaning it clamps only in reverse bias and conducts forward current like a standard rectifier. Polarity is identified by a visible color band on the cathode end of the DO-214AB package - the banded end connects to the protected line (e.g., 24 V rail), while the unbanded end connects to ground. Bidirectional variants carry a "C" suffix (e.g., SMCJ30CA), which the SMCJ30A does not have.
What is the reverse leakage current specification for the SMCJ30A at its rated VRWM?
The SMCJ30A specifies a maximum reverse leakage current (IR) of 5 μA when biased at its 30 V reverse stand-off voltage (VRWM), tested at TA = 25 °C. This low leakage ensures minimal impact on high-impedance sensing nodes or battery-backed circuits. Actual measurements typically fall well below this limit - often <1 μA - supporting reliable operation in precision analog and low-power monitoring applications using the SMCJ30A.
Does the SMCJ30A meet UL safety certification requirements?
Yes, the SMCJ30A carries UL Certificate #E258596 and complies with UL94V-0 flammability standards for its epoxy molding compound. This certification confirms that the device's package material will self-extinguish within 10 seconds after flame removal and will not drip flaming particles - a critical requirement for industrial control panels, power supplies, and enclosed equipment where fire propagation risk must be minimized. The SMCJ30A's UL listing applies to its standard DO-214AB configuration.
What is the operating junction temperature range for the SMCJ30A?
The SMCJ30A is rated for an operating junction temperature (TJ) range of –55 °C to +150 °C, enabling deployment in extreme ambient environments such as under-hood automotive modules, outdoor telecom cabinets, and industrial variable-frequency drives. Its glass-passivated junction and thermally efficient DO-214AB package allow sustained operation at maximum TJ without parameter shift or reliability degradation - a key design advantage confirmed across accelerated life testing per JESD22-A108.
SMCJ30A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- DO-214AB, SMC
- Series:
- SMCJ
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 30V
- Voltage - Breakdown (Min):
- 33.3V
- Voltage - Clamping (Max) @ Ipp:
- 48.4V
- Current - Peak Pulse (10/1000µs):
- 31A
- Power - Peak Pulse:
- 1500W (1.5kW)
- 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-214AB (SMC)
SMCJ30A FAQ
1.How can I place an order for SMCJ30A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ30A 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 SMCJ30A reliable?
The price and inventory of SMCJ30A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ30A is usually 5 days.
3.What payment methods are accepted for SMCJ30A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ30A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ30A?
SMCJ30A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ30A 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 SMCJ30A?
For technical support, including SMCJ30A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ30A requirements.
6.How does Aetrix verify that SMCJ30A is sourced from the original manufacturer or authorized distributors?
All SMCJ30A 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 SMCJ30A meets industry standards.
7.What is the process for return or replacement of SMCJ30A?
All SMCJ30A units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ30A, 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 SMCJ30A part is unused and in its original packaging.
Return procedure for SMCJ30A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ30A Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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onsemi
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Diodes Incorporated
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D5V0P1B2LP-7B
Diodes Incorporated
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DESD5V0U1BA-7
Diodes Incorporated
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ESD5Z5.0T1G
onsemi
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DESD5V0U1BB-7
Diodes Incorporated
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D12V0L1B2LP-7B
Diodes Incorporated
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PESD2V0Y1BSFYL
Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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