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onsemi 1PMT40AT1
- Part No.:
- 1PMT40AT1
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-216AA
- Datasheet:
-
1PMT40AT1.pdf
- Description:
- TVS DIODE 40VWM 64.5VC POWERMITE
- Quantity:
- Payment:
- Shipping:
Inventory:6,181
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Product details
Overview
1PMT40AT1 from onsemi is a unidirectional Zener transient voltage suppressor (TVS) in the POWERMITE® package, designed for clamping high-energy ESD and surge transients in DC power rails and signal lines. It features a 40 V working peak reverse voltage (VRWM), 64.5 V maximum clamping voltage at 2.7 A peak pulse current, 175 W peak pulse power (10/1000 µs), <1 ns response time, and 1.1 mm max height. It is widely deployed in portable power supplies and USB interface protection.
For engineers reviewing the 1PMT40AT1 datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage margin vs. protected IC's absolute maximum rating, thermal performance under repeated surge duty cycles, PCB footprint constraints, and compatibility with automated SMT reflow profiles up to 260°C.
Technical Context
The 1PMT40AT1 operates as a unidirectional Zener-based TVS diode, leveraging avalanche breakdown to clamp transient overvoltages above its VRWM of 40 V. Its low Zener impedance and fast sub-nanosecond response ensure minimal overshoot during ESD events per IEC 61000-4-2 (Class 3, >16 kV HBM).
Thermally, it uses an integral cathode-side metal tab (RJcathode = 3.2 °C/W) and full metallic bottom for efficient heat conduction into the PCB copper pour. Its POWERMITE (DO-216AA) package delivers SMA-equivalent thermal performance in 50% less footprint area (8.45 mm²) and 1.1 mm height.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Peak Reverse Voltage (VRWM) | 40 V - Sets minimum operating voltage threshold before clamping begins; must exceed circuit's normal DC rail voltage. |
| Clamping Voltage (VC) @ IPP | 64.5 V @ 2.7 A - Maximum voltage seen by protected load during 10/1000 µs surge; defines safe margin below downstream IC's absolute max rating. |
| Peak Pulse Power (Ppk) | 175 W @ 10/1000 µs - Sustains single high-energy transients without failure; derates linearly above 25°C ambient. |
| Response Time | <1 ns - Ensures clamping activation prior to damage onset in fast-rising ESD events (e.g., human-body model). |
| ESD Rating (HBM) | Class 3 (>16 kV) - Validated immunity to electrostatic discharge per JEDEC JS-001, suitable for handheld device interfaces. |
| Package | POWERMITE® (DO-216AA), 8.45 mm² footprint, 1.1 mm max height - Enables ultra-compact placement in space-constrained PCBs like smartphone power rails. |
| Thermal Resistance (Junction-to-Cathode Tab) | 3.2 °C/W - Enables direct thermal coupling to large copper areas; critical for reliability under repetitive surges. |
Pinout & Package
POWERMITE® (DO-216AA) package: surface-mount, 2-terminal, cathode-indicated by polarity band. Integral heatsink tabs and full metallic bottom enable low-thermal-resistance mounting directly to PCB copper pour.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Cathode) | Transient current sink / clamping node | Connected to protected line (e.g., VBUS); carries full surge current to ground via low-inductance path. |
| 2 (Anode) | Reference / ground return | Typically tied to system ground plane; low RJanode (35 °C/W) supports stable reference during clamping. |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile POWERMITE® package | 1.1 mm max height enables use in ultrathin consumer devices where SMA or SMC packages are mechanically incompatible. |
| Integral cathode heatsink tab | Reduces RJcathode to 3.2 °C/W, allowing 3× higher sustained surge duty cycle vs. standard SOD-123 without thermal runaway. |
| Full metallic bottom construction | Eliminates flux entrapment during reflow, ensuring consistent solder joint integrity and long-term reliability in high-volume manufacturing. |
| Pb-free and RoHS-compliant | Meets global environmental compliance requirements without compromising surge robustness or thermal performance. |
Applications
| USB Power Input Protection | DC-DC Converter Input Rail |
|---|---|
Use Scenario: Protecting USB Type-C VBUS input (5–20 V) against hot-plug transients and ESD events in portable chargers and docking stations. IC Role / Device Role / Timing Role: Unidirectional TVS clamping element placed between VBUS and GND, activated within <1 ns to limit voltage to ≤64.5 V. Use Value: Prevents latch-up or gate oxide damage in synchronous rectifier MOSFETs and buck controller ICs rated for 65 V max input. |
Use Scenario: Safeguarding 48 V input stage of isolated DC-DC converters used in industrial IoT gateways against lightning-induced surges. IC Role / Device Role / Timing Role: Primary transient suppression device on primary-side input, coordinated with upstream fuse and common-mode choke. Use Value: Withstands 175 W (10/1000 µs) pulses without degradation, maintaining clamping performance across 10⁵+ surge events when mounted on ≥2 oz Cu ground plane. |
| Portable Medical Device Battery Interface | Automotive Body Control Module (BCM) Sensor Supply |
Use Scenario: Shielding Li-ion battery monitor ICs and fuel gauges from load-dump transients during battery insertion/removal in handheld diagnostic tools. IC Role / Device Role / Timing Role: Standoff-rated TVS (VRWM = 40 V) placed at battery connector, clamping spikes before they reach analog front-end circuitry. Use Value: Low leakage (<1 µA @ 40 V) avoids parasitic drain on standby battery; 16 kV HBM rating ensures ESD survivability during field servicing. |
Use Scenario: Protecting 12 V sensor supply lines (e.g., for temperature or pressure sensors) in BCMs against ISO 7637-2 pulse 1 and pulse 2a transients. IC Role / Device Role / Timing Role: Secondary-level TVS on regulated 12 V rail, complementing primary CAN bus protection and bulk capacitance. Use Value: Compact 8.45 mm² footprint allows placement adjacent to each sensor connector; 1.1 mm height avoids interference with stacked connectors or shielding cans. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ40A | Same VRWM (40 V) and VC (64.5 V), but SMA package (2.5 mm height, 2× larger footprint); RJcathode = 50 °C/W. | Less effective thermal dissipation under repetitive surges; requires larger pad area for equivalent cooling. | Select when legacy SMA footprint is fixed and board height >2.5 mm is acceptable. |
| 1.5SMC40A | Higher Ppk (1500 W @ 10/1000 µs), but SMC package (7.1 mm × 6.2 mm, 2.6 mm height); VRWM = 40 V, VC = 64.4 V. | Better single-pulse energy handling, but unsuitable for space-constrained designs due to 5× larger footprint. | Select only for high-energy automotive load-dump protection where PCB area is not constrained. |
Compared with SMAJ40A and 1.5SMC40A, the 1PMT40AT1 offers superior volumetric efficiency (8.45 mm² × 1.1 mm) and thermal performance (RJcathode = 3.2 °C/W) for compact, thermally demanding applications-without sacrificing clamping accuracy or ESD robustness.
Availability
1PMT40AT1 is available at Aetrix Electronics and suitable for USB power input protection, DC-DC converter input rail safeguarding, and portable medical device battery interface applications requiring stable component supply, consistent Pb-free compliance, and tight parametric binning.
Supply support for 1PMT40AT1 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 management, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The 1PMT40AT1 belongs to the 1PMT5.0AT1G/T3G Series of Zener transient voltage suppressors, engineered specifically for high-density, low-profile board-level ESD and surge protection in portable and battery-powered systems.
FAQ
What is the exact working peak reverse voltage (VRWM) of the 1PMT40AT1?
The 1PMT40AT1 has a specified working peak reverse voltage (VRWM) of 40 V, meaning it remains non-conductive up to this DC or continuous peak voltage level. This value is confirmed in the Electrical Characteristics table on page 3 of the official datasheet (1PMT5.0AT3/D, Rev. 10), where the 1PMT40AT1G entry lists VRWM = 40 V with VBR min = 44.4 V at IT = 1.0 mA.
Does the 1PMT40AT1 meet industry-standard ESD immunity requirements?
Yes, the 1PMT40AT1 is rated for Class 3 ESD immunity (>16 kV) per the Human Body Model (HBM), as stated in the Specification Features section of the datasheet. This makes it suitable for protecting sensitive interfaces in handheld electronics, including USB, display, and button circuits where direct user contact occurs.
What is the maximum clamping voltage of the 1PMT40AT1 under surge conditions?
The 1PMT40AT1 exhibits a maximum clamping voltage (VC) of 64.5 V when subjected to its rated peak pulse current (IPP) of 2.7 A under the standard 10/1000 µs waveform. This value is explicitly listed in the Electrical Characteristics table for the 1PMT40AT1G variant and defines the upper voltage limit imposed on protected circuitry during transient events.
Can the 1PMT40AT1 be used in reflow soldering processes?
Yes, the 1PMT40AT1 is qualified for lead-free reflow soldering with a maximum case temperature of 260°C for 10 seconds, as specified in the Mechanical Characteristics section. Its POWERMITE® package uses void-free, thermosetting plastic and corrosion-resistant, readily solderable leads compatible with standard J-STD-020 profiles.
How does the thermal performance of the 1PMT40AT1 compare to traditional SMA-packaged TVS diodes?
The 1PMT40AT1 achieves a junction-to-cathode thermal resistance (RJcathode) of 3.2 °C/W - significantly lower than typical SMA devices (~50 °C/W). This is enabled by its integral metallic cathode tab and full metallic bottom, allowing more efficient heat transfer to the PCB and supporting higher surge repetition rates without thermal runaway.
1PMT40AT1 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):
- 40V
- Voltage - Breakdown (Min):
- 44.4V
- Voltage - Clamping (Max) @ Ipp:
- 64.5V
- 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
1PMT40AT1 FAQ
1.How can I place an order for 1PMT40AT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1PMT40AT1 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 1PMT40AT1 reliable?
The price and inventory of 1PMT40AT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1PMT40AT1 is usually 5 days.
3.What payment methods are accepted for 1PMT40AT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1PMT40AT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1PMT40AT1?
1PMT40AT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1PMT40AT1 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 1PMT40AT1?
For technical support, including 1PMT40AT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1PMT40AT1 requirements.
6.How does Aetrix verify that 1PMT40AT1 is sourced from the original manufacturer or authorized distributors?
All 1PMT40AT1 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 1PMT40AT1 meets industry standards.
7.What is the process for return or replacement of 1PMT40AT1?
All 1PMT40AT1 units undergo pre-shipment inspection (PSI). If there is an issue with 1PMT40AT1, 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 1PMT40AT1 part is unused and in its original packaging.
Return procedure for 1PMT40AT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1PMT40AT1 Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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ESD5Z3.3T1G
onsemi
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D5V0H1B2LP-7B
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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DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
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D5V0L1B2WS-7
Diodes Incorporated
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