My Inquiry
My Account
onsemi 1.5SMC22AT3
- Part No.:
- 1.5SMC22AT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC22AT3.pdf
- Description:
- TVS DIODE 18.8VWM 30.6VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:6,475
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1.5SMC22AT3 from ON Semiconductor is a unidirectional 1500 W peak power Zener transient voltage suppressor (TVS) designed for parallel clamping protection of sensitive electronics. It features a 18.8 V working peak reverse voltage (VRWM), 22 V breakdown voltage (VBR) at 1 mA test current, and clamps to 30.6 V at 49 A peak pulse current - ideal for safeguarding DC power rails in industrial power supplies and automotive ECUs.
For engineers reviewing the 1.5SMC22AT3 datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage margin vs. system operating voltage, surge current capability under 1 ms pulses, UL 497B recognition for isolated loop protection, and SMC package thermal performance in high-temperature ambient environments.
Technical Context
The 1.5SMC22AT3 operates as a unidirectional Zener-based TVS diode, leveraging avalanche breakdown to clamp transients above VRWM. Its response time is typically <1 ns, and it exhibits low zener impedance with a maximum temperature coefficient of 0.092 %/°C for VBR stability across temperature.
It is rated for 1500 W non-repetitive peak pulse power (10/1000 µs waveform), supports forward surge current up to 200 A (8.3 ms half-sine), and maintains <5 µA leakage at VRWM - enabling reliable protection without loading normal operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 1500 W @ 1 ms - sustains single high-energy surges common in automotive load-dump or industrial EFT events |
| Working Peak Reverse Voltage (VRWM) | 18.8 V - sets minimum system operating voltage threshold before clamping activates |
| Breakdown Voltage (VBR) | 22 V ±5% @ 1 mA - defines precise avalanche onset point for predictable protection triggering |
| Clamping Voltage (VC) | 30.6 V @ 49 A IPP - maximum voltage seen by protected circuit during full-rated surge |
| Leakage Current (IR) | <5 µA @ 18.8 V - negligible standby power loss and no signal integrity impact in DC bias applications |
| Response Time | <1 ns - ensures suppression initiates before transient energy damages downstream ICs |
| ESD Rating | Class 3 (>16 kV HBM) - meets IEC 61000-4-2 Level 4 for system-level ESD robustness |
Pinout & Package
1.5SMC22AT3 is housed in the SMC (DO-214AB) surface-mount package (Case 403), featuring a modified L-bend leadform for enhanced pad adhesion and void-free thermoset plastic molding. Polarity is marked by a molded cathode notch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or lowest potential node in unidirectional clamping configuration |
| Cathode | High-side transient input terminal | Connected to protected line (e.g., +12 V rail); clamps to anode when voltage exceeds VRWM |
Key Features
| Feature | Design Value |
|---|---|
| UL 497B Recognition (QVGV2) | Validated for isolated loop circuit protection - enables use in telecom interfaces and safety-critical industrial isolation barriers |
| Surmetic™ Package Reliability | Void-free transfer-molded construction with corrosion-resistant leads - ensures long-term solder joint integrity in humid or thermally cycled environments |
| Thermal Performance | RJA = 165 °C/W (FR-4 board), RJL = 54.6 °C/W - supports sustained operation up to +150 °C junction temperature with proper PCB copper area |
| Low Clamping Ratio | VC/VBR = 30.6/22 ≈ 1.39 - tight voltage margin preserves headroom for downstream 3.3 V or 5 V logic while suppressing 24 V system transients |
| ESD Robustness | Class 3 (>16 kV HBM) - eliminates need for additional discrete ESD components in front-end I/O protection stages |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Card |
|---|---|
Use Scenario: Protects 12 V supply rail against ISO 7637-2 load dump transients (up to 60 V, 100 ms) and jump-start spikes. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed directly at power entry point before DC-DC converter input. Use Value: Limits rail voltage to ≤30.6 V during 49 A surge, preventing overvoltage shutdown or damage to 36 V-rated input capacitors and controller ICs. |
Use Scenario: Shields 24 V digital input optocoupler interface from field-wiring induced surges and inductive kickback. IC Role / Device Role / Timing Role: Parallel-connected transient suppressor on input line, referenced to common ground. Use Value: Clamps fast-rising transients (<1 ns response) before they couple into isolation barrier, maintaining IEC 61000-4-5 compliance at 2 kV surge level. |
| Medical Infusion Pump Power Supply | Telecom Remote Terminal Unit (RTU) |
Use Scenario: Safeguards isolated 5 V/12 V auxiliary rails in battery-backed medical devices against ESD and EFT events per IEC 60601-1-2. IC Role / Device Role / Timing Role: Secondary-stage TVS on post-regulator outputs feeding microcontroller and motor drivers. Use Value: Sub-5 µA leakage avoids battery drain; UL 497B recognition validates use in patient-connected equipment with reinforced isolation requirements. |
Use Scenario: Protects RS-485 communication lines and 48 V PoE-powered logic rails in outdoor telecom cabinets exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Primary-level TVS on power input and data line pairs, mounted adjacent to connectors. Use Value: 1500 W peak power rating handles multi-kA induced surges; SMC package allows compact layout near I/O ports without compromising creepage/clearance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ22A | 600 W peak power, same VRWM (18.8 V) and VBR (22 V), SMB package (smaller footprint, lower thermal mass) | Lower surge capacity limits use to Class B (IEC 61000-4-5) rather than Class C/D systems | Select when space-constrained layouts prioritize size over 1500 W surge handling |
| 1.5KE22A | Through-hole DO-201 package, identical electrical specs but higher RJA (~200 °C/W), no UL 497B listing | Lacks regulatory approval for isolated loop protection; unsuitable for telecom or medical isolation barriers | Choose only for legacy through-hole designs where UL certification is not required |
Compared with SMBJ22A and 1.5KE22A, the 1.5SMC22AT3 delivers superior surge robustness in surface-mount form with certified isolation barrier compatibility - making it the preferred choice for new industrial and automotive designs requiring both high-power clamping and regulatory traceability.
Availability
1.5SMC22AT3 is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC input cards, and medical infusion pump power supplies requiring stable component supply and long-term lifecycle support.
Supply support for 1.5SMC22AT3 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 part of onsemi) is a global semiconductor supplier specializing in energy-efficient power, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and medical markets.
The 1.5SMC22AT3 belongs to the SMC-series transient voltage suppressors - engineered for high-reliability clamping in harsh environments where UL recognition, fast response, and 1500 W surge immunity are mandatory.
FAQ
What is the clamping voltage of the 1.5SMC22AT3 at its rated peak pulse current?
The 1.5SMC22AT3 clamps to a maximum of 30.6 V at its rated peak pulse current of 49 A (10/1000 µs waveform). This value is measured under standardized surge conditions and represents the highest voltage the protected circuit will experience during full-rated transient events - critical for verifying margin against downstream component absolute maximum ratings.
Is the 1.5SMC22AT3 RoHS compliant and halogen-free?
Yes, the 1.5SMC22AT3 is RoHS compliant and halogen-free per ON Semiconductor's standard product specifications. The Surmetic™ package uses lead-free terminations and conforms to JEDEC J-STD-020 moisture sensitivity level (MSL) 1 - enabling standard reflow assembly without special handling.
Does the 1.5SMC22AT3 have AEC-Q200 qualification for automotive use?
No, the 1.5SMC22AT3 is not AEC-Q200 qualified. While widely used in automotive applications such as body control modules due to its robust surge rating and thermal performance, it is specified for general industrial and commercial use. For AEC-Q200–mandated designs, consult onsemi's automotive-grade P6SMB or SMAJ series alternatives.
How does the 1.5SMC22AT3 differ from bidirectional TVS diodes like 1.5SMC22CA?
The 1.5SMC22AT3 is unidirectional and functions only during positive transients on the cathode relative to anode - ideal for DC power rail protection. In contrast, 1.5SMC22CA is bidirectional and clamps both polarities, suited for AC lines or data signals. The 1.5SMC22AT3 offers tighter leakage (<5 µA) and lower capacitance than its bidirectional counterpart, preserving signal integrity in DC-coupled paths.
What is the recommended PCB footprint for the 1.5SMC22AT3 SMC package?
The 1.5SMC22AT3 uses the standard SMC (DO-214AB) footprint per Case 403 outline: 7.75 mm × 6.10 mm body with 2.79 mm lead spacing. ON Semiconductor recommends a minimum 1.0 mm² copper pour per pad (per Figure 7 in the datasheet) to achieve the specified RJA = 165 °C/W and sustain 1500 W surge capability without thermal runaway.
1.5SMC22AT3 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):
- 18.8V
- Voltage - Breakdown (Min):
- 20.9V
- Voltage - Clamping (Max) @ Ipp:
- 30.6V
- Current - Peak Pulse (10/1000µs):
- 49A
- 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
1.5SMC22AT3 FAQ
1.How can I place an order for 1.5SMC22AT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC22AT3 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 1.5SMC22AT3 reliable?
The price and inventory of 1.5SMC22AT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC22AT3 is usually 5 days.
3.What payment methods are accepted for 1.5SMC22AT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC22AT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC22AT3?
1.5SMC22AT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC22AT3 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 1.5SMC22AT3?
For technical support, including 1.5SMC22AT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC22AT3 requirements.
6.How does Aetrix verify that 1.5SMC22AT3 is sourced from the original manufacturer or authorized distributors?
All 1.5SMC22AT3 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 1.5SMC22AT3 meets industry standards.
7.What is the process for return or replacement of 1.5SMC22AT3?
All 1.5SMC22AT3 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC22AT3, 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 1.5SMC22AT3 part is unused and in its original packaging.
Return procedure for 1.5SMC22AT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC22AT3 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…
