My Inquiry
My Account
onsemi 1.5SMC39AT3
- Part No.:
- 1.5SMC39AT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC39AT3.pdf
- Description:
- TVS DIODE 33.3VWM 53.9VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:9,676
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1.5SMC39AT3 from ON Semiconductor is a unidirectional 1500 W transient voltage suppressor (TVS) diode designed for parallel overvoltage protection of sensitive electronics. It features a 33.3 V working peak reverse voltage (VRWM), 39 V nominal Zener breakdown voltage (VBR) at 1 mA test current, and clamps to ≤53.9 V at 28 A peak pulse current (IPP), making it suitable for automotive power line surge suppression and industrial power supply input protection.
For engineers reviewing the 1.5SMC39AT3 datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage margin vs. system operating voltage, peak pulse current capability under 1 ms 10/1000 µs waveform, UL 497B recognition for isolated loop circuits, and SMC package thermal performance in high-temperature ambient environments.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector, turning on rapidly (<1.0 ns typical response) when reverse voltage exceeds VRWM to divert transient energy away from downstream circuitry. Its low dynamic impedance and tight VBR tolerance (±5%) ensure consistent clamping behavior across temperature and unit-to-unit variation.
The device uses a planar Zener junction structure in a void-free thermosetting plastic SURMETIC® SMC package, enabling robust 1500 W non-repetitive surge handling per IEC 61000-4-5 Level 4 requirements. Thermal resistance from junction-to-lead is 18.3 °C/W, supporting reliable operation up to +150 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 1500 W @ 1.0 ms 10/1000 µs waveform - supports IEC 61000-4-5 Level 4 surge immunity testing |
| Working Peak Reverse Voltage (VRWM) | 33.3 V - must be ≥ continuous DC bus voltage to avoid leakage-induced heating in standby |
| Zener Breakdown Voltage (VBR) | 39 V ±5% @ 1 mA - defines precise turn-on threshold for overvoltage detection and clamping initiation |
| Maximum Clamping Voltage (VC) | 53.9 V @ 28 A IPP - establishes absolute worst-case voltage seen by protected ICs during surge events |
| Leakage Current (IR) | <5 µA @ 33.3 V - ensures negligible standby power loss in battery-powered or high-impedance circuits |
| ESD Rating | Class 3 HBM >16 kV - provides intrinsic ESD hardening without external protection networks |
| UL Recognition | UL 497B QVGQ2 certified - validated for isolated loop circuit protection in telecom and industrial interfaces |
Pinout & Package
Package: SMC (Case 403), surface-mount, Pb-free, cathode indicated by molded polarity notch. Dimensions: 5.59–6.10 mm (D) × 6.60–7.11 mm (E) × 1.90–2.41 mm (A), with modified L-bend leads for enhanced pad adhesion.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current return path during clamping | Connected to system ground or low-side reference; carries full surge current during transient events |
| Cathode | High-voltage input terminal | Connected to protected line (e.g., 24 V rail); polarity notch identifies this terminal for correct PCB orientation |
Key Features
| Feature | Design Value |
|---|---|
| Fast response time | <1.0 ns typical - minimizes voltage overshoot before clamping engages, critical for protecting fast-switching MOSFET gates |
| Low zener impedance | Dynamic impedance <0.7 Ω - maintains tight clamping voltage across wide IPP range, reducing stress on downstream regulators |
| SURMETIC® package reliability | Void-free transfer-molded construction - eliminates moisture ingress paths and improves thermal cycling endurance beyond JEDEC MSL 1 |
| AEC-Q101 qualification | Qualified for automotive applications - validated for temperature cycling, humidity bias, and mechanical shock per automotive-grade reliability standards |
| UL 497B certification | Recognized for isolated loop protection - enables use in RS-485, CAN, and analog sensor interfaces without additional safety approvals |
Applications
| Automotive Power Distribution | Industrial PLC Input Protection |
|---|---|
Use Scenario: 12 V/24 V battery line protection in engine control units against load dump transients (ISO 7637-2 Pulse 5a). IC Role / Device Role / Timing Role: Shunt clamping element placed directly across power input before DC-DC converter stage. Use Value: Limits voltage to ≤53.9 V during 1500 W surges, preventing damage to 36 V-rated buck controllers and microcontrollers. |
Use Scenario: Protection of 24 V digital input channels in programmable logic controllers exposed to inductive switching noise. IC Role / Device Role / Timing Role: Parallel-connected transient suppressor at field-side connector interface. Use Value: Clamps fast-rising spikes (<1 ns rise time) from relay coil flyback, preserving signal integrity and eliminating false triggering. |
| Medical Equipment Power Supply | Telecom Interface Isolation |
Use Scenario: Input-stage surge suppression in Class II medical AC/DC adapters compliant with IEC 60601-1 3rd edition. IC Role / Device Role / Timing Role: Primary-side TVS on DC bus after rectification, upstream of isolation barrier. Use Value: Meets UL 497B requirements for isolated loop circuits while limiting let-through energy to safe levels for downstream optocouplers. |
Use Scenario: Overvoltage protection on RS-485 data lines in building automation systems with long cable runs. IC Role / Device Role / Timing Role: Bidirectional protection not required; unidirectional 1.5SMC39AT3 used on powered line (VCC side) only. Use Value: Provides 16 kV HBM ESD immunity and 1500 W surge handling without adding capacitance that degrades 10 Mbps signal integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ36A | Lower peak power (600 W), smaller SMB package (lower thermal mass), VRWM = 36 V, VC = 58.1 V @ 10.3 A | Better suited for space-constrained consumer electronics; insufficient for ISO 7637-2 load dump compliance | Select 1.5SMC39AT3 when 1500 W surge rating and UL 497B certification are mandatory |
| SMCJ36A | Same SMC package and 1500 W rating, but VRWM = 36 V and VC = 58.1 V @ 26 A - higher clamping voltage than 1.5SMC39AT3 | Acceptable where system margin allows 4.2 V higher clamping; lacks AEC-Q101 qualification | Choose 1.5SMC39AT3 for automotive designs requiring AEC-Q101 and tighter clamping (53.9 V vs. 58.1 V) |
Compared with SMBJ36A and SMCJ36A, the 1.5SMC39AT3 delivers lower clamping voltage (53.9 V), AEC-Q101 qualification, and UL 497B recognition - critical for automotive and industrial safety-critical inputs where voltage margin and regulatory compliance are non-negotiable.
Availability
1.5SMC39AT3 is available at Aetrix Electronics and suitable for automotive power distribution, industrial PLC input protection, and medical equipment power supply designs requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for 1.5SMC39AT3 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, sensors, and discrete devices for automotive, industrial, and cloud power applications.
The 1.5SMC39AT3 belongs to the SMC-series transient voltage suppressors, engineered specifically for high-energy surge protection in harsh environments where reliability, regulatory compliance, and precise clamping performance are essential.
FAQ
What is the maximum clamping voltage of the 1.5SMC39AT3 under surge conditions?
The 1.5SMC39AT3 clamps to a maximum of 53.9 V when subjected to its rated peak pulse current of 28 A (10/1000 µs waveform). This value is measured at the device terminals and represents the highest voltage that will appear across protected circuitry during a full-power transient event. Designers must verify that this clamping level remains below the absolute maximum ratings of downstream components.
Is the 1.5SMC39AT3 suitable for automotive applications?
Yes, the 1.5SMC39AT3 is AEC-Q101 qualified and PPAP capable, making it suitable for automotive applications including engine control units, body electronics, and infotainment power supplies. Its 1500 W surge rating meets ISO 7637-2 Pulse 5a load dump requirements, and its UL 497B recognition supports use in isolated communication interfaces within vehicles.
Does the 1.5SMC39AT3 have bidirectional capability?
No, the 1.5SMC39AT3 is a unidirectional TVS diode intended for DC line protection where polarity is fixed. It conducts only in reverse breakdown mode and blocks forward voltage up to 3.5 V. For AC or bidirectional signal line protection, a separate bidirectional part such as 1.5SMC39AT3G (if available) or a dedicated bidirectional TVS must be selected.
What is the thermal resistance and derating behavior of the 1.5SMC39AT3?
The 1.5SMC39AT3 has a junction-to-lead thermal resistance (RJL) of 18.3 °C/W and junction-to-ambient (RJA) of 165 °C/W on a standard FR-4 board. Power dissipation must be derated linearly above 75 °C lead temperature (4.0 W base, −18.3 mW/°C) or above 25 °C ambient (0.75 W base, −6.1 mW/°C), per the manufacturer's derating curves.
How does the 1.5SMC39AT3 differ from the 1.5SMC39AT3G variant?
The "G" suffix in 1.5SMC39AT3G denotes ON Semiconductor's Pb-free packaging standard, while 1.5SMC39AT3 (without G) refers to the legacy RoHS-compliant version with lead-containing solderable finishes. Both share identical electrical specifications, SMC package dimensions, and performance characteristics; the distinction lies solely in plating composition and JEDEC moisture sensitivity level compliance.
1.5SMC39AT3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- DO-214AB, SMC
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 33.3V
- Voltage - Breakdown (Min):
- 37.1V
- Voltage - Clamping (Max) @ Ipp:
- 53.9V
- Current - Peak Pulse (10/1000µs):
- 28A
- 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
1.5SMC39AT3 FAQ
1.How can I place an order for 1.5SMC39AT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC39AT3 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 1.5SMC39AT3 reliable?
The price and inventory of 1.5SMC39AT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC39AT3 is usually 5 days.
3.What payment methods are accepted for 1.5SMC39AT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC39AT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC39AT3?
1.5SMC39AT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC39AT3 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 1.5SMC39AT3?
For technical support, including 1.5SMC39AT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC39AT3 requirements.
6.How does Aetrix verify that 1.5SMC39AT3 is sourced from the original manufacturer or authorized distributors?
All 1.5SMC39AT3 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 1.5SMC39AT3 meets industry standards.
7.What is the process for return or replacement of 1.5SMC39AT3?
All 1.5SMC39AT3 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC39AT3, 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 1.5SMC39AT3 part is unused and in its original packaging.
Return procedure for 1.5SMC39AT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC39AT3 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…
