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onsemi 1PMT33AT3
- Part No.:
- 1PMT33AT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-216AA
- Datasheet:
-
1PMT33AT3.pdf
- Description:
- TVS DIODE 33VWM 53.3VC POWERMITE
- Quantity:
- Payment:
- Shipping:
Inventory:6,517
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Product details
Overview
1PMT33AT3 from onsemi is a unidirectional Zener transient voltage suppressor (TVS) in the POWERMITE® package, designed to protect sensitive electronics against ESD and surge events. It features a 33 V working peak reverse voltage (VRWM), 53.3 V maximum clamping voltage at 3.8 A peak pulse current, 200 W peak power rating (1 ms), <1 ns response time, and 16 kV HBM ESD rating - ideal for input protection in DC power rails of portable industrial sensors.
For engineers reviewing the 1PMT33AT3 datasheet, pinout, applications, or equivalent options, key selection criteria include clamping performance under 8/20 µs surges, thermal resistance to cathode tab (3.2 °C/W), low-profile mounting (1.1 mm height), and compatibility with automated SMT assembly on FR-4 PCBs with minimum pad design.
Technical Context
This device operates as a unidirectional Zener-based TVS diode, triggered when reverse voltage exceeds its 33 V VRWM threshold. Its clamping action limits transients to ≤53.3 V at 3.8 A IPP, with junction-to-cathode thermal resistance of 3.2 °C/W enabling effective heat transfer to the PCB copper pour via the full metallic bottom.
The POWERMITE (DO-216AA) package integrates locking tabs and an integral heatsink, delivering thermal performance comparable to SMA while occupying only 8.45 mm² footprint and 1.1 mm max height - critical for space-constrained USB ports, battery management inputs, and IoT sensor nodes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Peak Reverse Voltage (VRWM) | 33 V - sets minimum operating voltage threshold before clamping activation |
| Clamping Voltage (VC) @ IPP | 53.3 V at 3.8 A - defines worst-case voltage seen by protected IC during 1 ms surge |
| Peak Pulse Power (Ppk) | 200 W @ 1 ms - supports IEC 61000-4-5 Level 3 (1 kV/2 Ω) surge immunity |
| Response Time | <1 ns - ensures protection before transient energy reaches downstream circuitry |
| ESD Rating (HBM) | >16 kV - meets IEC 61000-4-2 Level 4 for handheld device interface ports |
| Thermal Resistance (Junction-to-Cathode) | 3.2 °C/W - enables direct thermal coupling to PCB ground plane for sustained surge handling |
| Package Footprint | 8.45 mm² - fits within tight spacing constraints of miniaturized power input stages |
Pinout & Package
The 1PMT33AT3 is housed in the POWERMITE® (DO-216AA) surface-mount package, featuring a full metallic bottom for thermal conduction and integral heatsink tabs. Dimensions: 2.05 × 2.18 × 1.1 mm (L × W × H), with cathode indicated by a polarity band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Cathode) | Surge return path / thermal interface | Connected to PCB ground pour; primary heat dissipation path via metallic bottom |
| 2 (Anode) | Protected line connection | Connected to input rail (e.g., 24–36 V DC supply); clamps to cathode during overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile POWERMITE package | 1.1 mm max height enables use in ultra-thin consumer enclosures and stacked PCB assemblies |
| Full metallic bottom | Eliminates flux entrapment and provides low-impedance thermal path to PCB copper |
| Integral heatsink/locking tabs | Enhances mechanical retention during reflow and improves thermal transfer without external heatsinks |
| Pb-free & RoHS compliant | Meets global environmental regulations and supports lead-free soldering at 260°C for 10 s |
| JEDEC DO-216AA registered | Ensures standardized footprint, solderability, and compatibility with automated placement equipment |
Applications
| Industrial Sensor Input Protection | USB-C Power Delivery Port |
|---|---|
Use Scenario: Protecting 24 V analog input channels of PLC I/O modules from induced lightning surges and cable discharge events. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between signal line and chassis ground, clamping transients before they reach precision ADC front-end. Use Value: 53.3 V clamping voltage ensures downstream op-amp input stays within absolute maximum ratings during 1 kV/2 Ω IEC 61000-4-5 surges. |
Use Scenario: Safeguarding VBUS lines in USB-C receptacles against hot-plug transients and ESD during mating/unmating. IC Role / Device Role / Timing Role: Standoff-rated TVS connected between VBUS and GND, activated only during overvoltage events exceeding 33 V. Use Value: 1.1 mm profile allows co-placement with USB-C connector without height conflict; 16 kV HBM rating exceeds USB-IF ESD requirements. |
| Smart Meter Power Supply Input | IoT Gateway Ethernet PoE Interface |
Use Scenario: Front-end protection of AC/DC converter input in utility smart meters exposed to mains-borne surges. IC Role / Device Role / Timing Role: Primary surge limiter on 36 V DC bus derived from rectified AC, absorbing up to 200 W for 1 ms. Use Value: 3.2 °C/W junction-to-cathode thermal resistance enables reliable operation with minimal copper area, reducing BOM cost vs. larger packages. |
Use Scenario: Secondary-level protection on 48 V PoE-powered Ethernet PHY interfaces in edge gateways. IC Role / Device Role / Timing Role: Clamp diode on PSE-side DC feed line, limiting voltage overshoot during load switching and cable fault conditions. Use Value: 8.45 mm² footprint allows placement adjacent to RJ45 magnetics without compromising signal integrity or layout density. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33A | Same VRWM (33 V), higher clamping (59.3 V @ 3.5 A), larger SMA package (4.5 mm height) | Less suitable for ultra-low-profile designs; better for high-reliability industrial boards with ample vertical clearance | Select SMAJ33A only if board stack-up permits ≥4.5 mm component height and higher clamping voltage is acceptable |
| 1.5SMC33A | Higher peak power (1500 W @ 10/1000 µs), larger SMC package (7.1 mm × 6.2 mm), 61.2 V clamping @ 24.3 A | Targeted at high-energy AC mains protection, not compact DC rail protection | Choose 1.5SMC33A only for legacy designs requiring >1 kW surge handling where footprint and height are secondary |
Compared with SMAJ33A and 1.5SMC33A, the 1PMT33AT3 delivers superior space efficiency (8.45 mm² vs. 22 mm² and 44 mm²), lower clamping voltage (53.3 V vs. 59.3 V and 61.2 V), and optimized thermal performance for dense DC power routing - making it the preferred choice for modern compact electronics.
Availability
1PMT33AT3 is available at Aetrix Electronics and suitable for industrial sensor interfaces, USB-C power delivery circuits, and smart meter power supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for 1PMT33AT3 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
onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and IoT markets.
The 1PMT33AT3 belongs to the 1PMT5.0AT1G/T3G Series of unidirectional Zener TVS diodes, engineered specifically for space-constrained DC input protection in portable and industrial electronics where low profile, high surge robustness, and thermal efficiency are critical.
FAQ
What is the clamping voltage of the 1PMT33AT3 under standard surge conditions?
The 1PMT33AT3 has a maximum clamping voltage (VC) of 53.3 V at 3.8 A peak pulse current (IPP), measured using the 10/1000 µs waveform per IEC 61000-4-5. This value ensures protected circuits remain within safe operating limits during typical industrial surge events, and is verified at ambient temperature of 25°C with specified test conditions.
Is the 1PMT33AT3 compatible with lead-free reflow soldering processes?
Yes, the 1PMT33AT3 is Pb-free and RoHS compliant, qualified for lead-free reflow soldering at 260°C for 10 seconds. Its POWERMITE package uses corrosion-resistant finishes and readily solderable leads, meeting IPC-J-STD-020 moisture sensitivity level (MSL) requirements for standard SMT assembly without pre-baking.
How does the thermal performance of the 1PMT33AT3 compare to traditional SMA packages?
The 1PMT33AT3 achieves a junction-to-cathode thermal resistance of 3.2 °C/W - matching or exceeding SMA-packaged TVS diodes - despite being 50% smaller in footprint. Its full metallic bottom and integral heatsink tabs enable direct thermal conduction to the PCB, eliminating the need for oversized copper pours required by larger packages.
Can the 1PMT33AT3 be used in bidirectional protection configurations?
No, the 1PMT33AT3 is a unidirectional TVS diode intended for DC line protection where polarity is fixed. For bidirectional AC or data-line protection, a different device such as the 1PMT33CAT3 (if available) or a dedicated bidirectional TVS like SMBJ33CA would be required - the 1PMT33AT3 lacks symmetrical breakdown characteristics.
What is the meaning of the "T3" suffix in 1PMT33AT3?
The "T3" suffix in 1PMT33AT3 denotes tape-and-reel packaging with 12,000 units per reel, Pb-free construction, and orientation where the cathode (short lead) faces the sprocket holes. This differs from the "T1G" variant (3,000/reel), and both share identical electrical and thermal specifications.
1PMT33AT3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- DO-216AA
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 33V
- Voltage - Breakdown (Min):
- 36.7V
- Voltage - Clamping (Max) @ Ipp:
- 53.3V
- Current - Peak Pulse (10/1000µs):
- -
- Power - Peak Pulse:
- 1000W (1kW)
- 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:
- Powermite
1PMT33AT3 FAQ
1.How can I place an order for 1PMT33AT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1PMT33AT3 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 1PMT33AT3 reliable?
The price and inventory of 1PMT33AT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1PMT33AT3 is usually 5 days.
3.What payment methods are accepted for 1PMT33AT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1PMT33AT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1PMT33AT3?
1PMT33AT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1PMT33AT3 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 1PMT33AT3?
For technical support, including 1PMT33AT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1PMT33AT3 requirements.
6.How does Aetrix verify that 1PMT33AT3 is sourced from the original manufacturer or authorized distributors?
All 1PMT33AT3 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 1PMT33AT3 meets industry standards.
7.What is the process for return or replacement of 1PMT33AT3?
All 1PMT33AT3 units undergo pre-shipment inspection (PSI). If there is an issue with 1PMT33AT3, 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 1PMT33AT3 part is unused and in its original packaging.
Return procedure for 1PMT33AT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1PMT33AT3 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
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D5V0L1B2WS-7
Diodes Incorporated
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