My Inquiry
My Account
onsemi 1SMC30AT3G
- Part No.:
- 1SMC30AT3G
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1SMC30AT3G.pdf
- Description:
- TVS DIODE 30VWM 48.4VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:7,498
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1SMC30AT3G from ON Semiconductor is a unidirectional 1500 W peak power Zener transient voltage suppressor (TVS) designed for parallel protection of DC power rails and signal lines. It features a 30 V working peak reverse voltage (VRWM), 48.4 V maximum clamping voltage at 31 A peak pulse current, <5 µA leakage above 10 V, <1 ns response time, and UL 497B recognition for isolated loop circuit protection.
For engineers reviewing the 1SMC30AT3G datasheet, pinout, applications, or equivalent options, this device is selected for robust overvoltage protection in automotive power supplies, industrial I/O interfaces, telecom line cards, and medical equipment where fast clamping, high surge immunity, and certified safety compliance are required.
Technical Context
The 1SMC30AT3G operates as a unidirectional Zener-based TVS diode, leveraging avalanche breakdown to clamp transients above its 33.3–36.8 V breakdown voltage range (VBR @ IT = 1 mA). Its low zener impedance and thermally optimized Surmetic™ SMC package enable stable clamping under 1 ms 1500 W pulses without thermal runaway.
It exhibits negligible capacitive delay but requires minimized PCB trace inductance to suppress voltage overshoot during turn-on. The device is rated for –65 °C to +150 °C operation, with derating applied above 75 °C junction temperature and validated for ESD >16 kV (HBM).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 1500 W @ 1 ms - sustains single high-energy surges per IEC 61000-4-5 Level 4 without failure |
| Working Peak Reverse Voltage (VRWM) | 30 V - maximum continuous DC or peak AC voltage the device blocks in normal operation |
| Breakdown Voltage (VBR) | 33.3–36.8 V @ 1 mA - precise Zener onset range ensures reliable triggering before system damage |
| Clamping Voltage (VC) | 48.4 V @ 31 A IPP - limits transient voltage seen by downstream ICs to safe levels |
| Leakage Current (IR) | <5 µA @ 30 V - minimal standby power loss and no interference with low-current sensing circuits |
| Response Time | <1 ns - enables protection against sub-nanosecond ESD and fast-rising lightning-induced spikes |
| ESD Rating | Class 3 (>16 kV HBM) - exceeds IEC 61000-4-2 Level 4 for board-level ESD immunity |
Pinout & Package
Package: SMC (Case 403), surface-mount, void-free thermosetting plastic with modified L-bend leads and molded cathode notch polarity indicator.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction | Connected to ground or lower-potential rail in unidirectional TVS configuration |
| Cathode | Current exit terminal during reverse breakdown | Connected to protected line; marked by molded notch - defines clamping polarity |
Key Features
| Feature | Design Value |
|---|---|
| UL 497B Recognition | Validated for isolated loop circuit protection - meets safety requirements for telecom and medical isolation barriers |
| Surmetic™ Package | High-reliability, cost-effective SMC housing with 260 °C soldering tolerance and corrosion-resistant finish |
| Low Clamping Ratio | VC / VBR ≈ 1.45 - tight ratio minimizes overvoltage margin while ensuring robust surge handling |
| Thermal Stability | RJL = 18.3 °C/W - efficient junction-to-lead heat transfer supports repeated surge events at elevated ambient temperatures |
| High Surge Current | 31 A peak pulse current - withstands IEC 61000-4-5 combination wave (1.2/50 µs voltage, 8/20 µs current) |
Applications
| Automotive Power Rail Protection | Industrial PLC Digital I/O Protection |
|---|---|
|
Use Scenario: 12 V battery-supplied ECUs exposed to load dump (ISO 7637-2 Pulse 5a) and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp surges before they reach MCU power pins. Use Value: 48.4 V clamping ensures microcontrollers with 3.3 V/5 V supply rails remain within absolute maximum ratings during 100 V/200 ms load dump events. |
Use Scenario: 24 V digital input modules in factory automation systems subject to inductive switching noise and field wiring surges. IC Role / Device Role / Timing Role: Parallel-connected TVS on each input channel to shunt transient energy away from optocoupler input LEDs and protection resistors. Use Value: <5 µA leakage prevents false triggering of high-impedance inputs; 1500 W rating handles repetitive 1 kV/500 A surge tests per IEC 61000-4-4. |
| Telecom Line Card Surge Protection | Medical Equipment Isolated Power Interface |
|
Use Scenario: Primary-side protection on POTS line interface cards handling lightning-induced surges up to 10/700 µs waveform. IC Role / Device Role / Timing Role: First-stage TVS on tip/ring lines upstream of GDT and series impedance, providing fast initial clamping. Use Value: <1 ns response time captures fast-rising edge of lightning surges before secondary protectors activate; UL 497B certification validates use in telecom safety-critical paths. |
Use Scenario: Secondary-side DC-DC converter output in patient-connected devices requiring reinforced isolation and low leakage. IC Role / Device Role / Timing Role: Output rail TVS referenced to isolated ground to suppress coupling noise across isolation barrier without compromising creepage/clearance. Use Value: UL 497B recognition confirms suitability for isolated loop protection; <5 µA leakage avoids violating IEC 60601-1 patient leakage current limits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ30A | Same VRWM (30 V) and VC (48.4 V), but lower 600 W peak power rating and SMB package (smaller footprint, higher RJA) | Preferred for space-constrained designs with lower surge exposure (e.g., consumer USB ports); not suitable for automotive load dump | Select SMBJ30A only when surge threat level is ≤ IEC 61000-4-5 Level 2 and PCB area is critical. |
| 1.5SMC30A | Identical electrical specs and SMC package, but obsolete ON Semiconductor part number (replaced by 1SMC30AT3G); same marking and UL recognition | No functional difference - direct legacy replacement with identical qualification and sourcing traceability | 1.5SMC30A is functionally identical and may be used interchangeably where available; 1SMC30AT3G is the current production version. |
Compared with SMBJ30A, the 1SMC30AT3G delivers 2.5× higher surge energy handling in the same SMC footprint, enabling single-device compliance with automotive and industrial surge standards. Against 1.5SMC30A, it offers updated manufacturing controls and guaranteed long-term availability without performance deviation.
Availability
1SMC30AT3G is available at Aetrix Electronics and suitable for automotive electronics, industrial programmable logic controllers, telecom infrastructure, and medical diagnostic equipment requiring stable component supply and certified surge protection.
Supply support for 1SMC30AT3G 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 (now onsemi) is a global semiconductor supplier specializing in energy-efficient power management, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and medical markets.
The 1SMC30AT3G belongs to the SMC-series transient voltage suppressors - engineered for high-reliability, high-power surge protection in harsh environments where UL certification, fast response, and thermal robustness are mandatory.
FAQ
What is the clamping voltage of the 1SMC30AT3G at its rated peak pulse current?
The 1SMC30AT3G has a maximum clamping voltage (VC) of 48.4 V at 31 A peak pulse current (IPP), measured under 1 ms 10/1000 µs waveform conditions. This value ensures downstream components see limited overvoltage during surge events, directly supporting design margin calculations for 3.3 V and 5 V logic rails.
Is the 1SMC30AT3G RoHS compliant and halogen-free?
Yes, the 1SMC30AT3G is RoHS compliant and halogen-free per ON Semiconductor's product change notices and material declarations. It meets JEDEC J-STD-609 Category 1 for bromine and chlorine content and carries the "Pb-Free" and "Green" markings per packaging specifications.
Can the 1SMC30AT3G be used in bidirectional configurations?
No, the 1SMC30AT3G is a unidirectional TVS diode and must be connected with cathode toward the protected line. Bidirectional operation requires separate devices like the 1SMC30CA or dual-diode configurations; the datasheet explicitly states bidirectional variants are not offered in the SMC series.
What is the thermal resistance from junction to ambient (RJA) for the 1SMC30AT3G?
The 1SMC30AT3G has a thermal resistance from junction to ambient (RJA) of 165 °C/W when mounted on an FR-4 board using ON Semiconductor's minimum recommended footprint (Case 403 outline). This value assumes zero airflow and governs derating above 25 °C ambient temperature per Figure 3 in the datasheet.
Does the 1SMC30AT3G require external series impedance for proper operation?
Yes, a current-limiting resistor or inductor is required upstream of the 1SMC30AT3G to prevent overstress during sustained overvoltage. The device is designed for transient suppression, not continuous regulation; without series impedance, excessive DC power dissipation could exceed its 0.75 W ambient-rated limit and cause thermal failure.
1SMC30AT3G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- DO-214AB, SMC
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- 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:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMC
1SMC30AT3G FAQ
1.How can I place an order for 1SMC30AT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMC30AT3G 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 1SMC30AT3G reliable?
The price and inventory of 1SMC30AT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMC30AT3G is usually 5 days.
3.What payment methods are accepted for 1SMC30AT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMC30AT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMC30AT3G?
1SMC30AT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMC30AT3G 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 1SMC30AT3G?
For technical support, including 1SMC30AT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMC30AT3G requirements.
6.How does Aetrix verify that 1SMC30AT3G is sourced from the original manufacturer or authorized distributors?
All 1SMC30AT3G 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 1SMC30AT3G meets industry standards.
7.What is the process for return or replacement of 1SMC30AT3G?
All 1SMC30AT3G units undergo pre-shipment inspection (PSI). If there is an issue with 1SMC30AT3G, 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 1SMC30AT3G part is unused and in its original packaging.
Return procedure for 1SMC30AT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMC30AT3G Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
