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onsemi 1PMT24AT1
- Part No.:
- 1PMT24AT1
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-216AA
- Datasheet:
-
1PMT24AT1.pdf
- Description:
- TVS DIODE 24VWM 38.9VC POWERMITE
- Quantity:
- Payment:
- Shipping:
Inventory:7,854
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Product details
Overview
1PMT24AT1 from onsemi is a unidirectional Zener transient voltage suppressor (TVS) in the POWERMITE® package, designed for clamping ESD and surge transients in low-voltage DC power rails. It features a 24 V working peak reverse voltage (VRWM), 38.9 V maximum clamping voltage at 5.1 A peak pulse current, 200 W peak pulse power (10/1000 µs), <1 ns response time, and 1.1 mm max height. It is used in portable electronics power input protection.
For engineers reviewing the 1PMT24AT1 datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM matching system operating voltage, clamping voltage margin relative to IC absolute maximum ratings, thermal performance under repeated surge duty, and PCB space constraints where its 8.45 mm² footprint and integral heatsink provide advantage over SMA.
Technical Context
This device operates as a unidirectional Zener-based TVS diode, conducting only during reverse overvoltage events above its breakdown threshold. Its clamping behavior is defined by a sharp Zener knee at ~26.7–29.5 V (VBR @ 1 mA), with low dynamic impedance ensuring stable voltage limiting under fast transients.
The POWERMITE package integrates a full metallic cathode tab for direct thermal coupling to PCB copper, achieving 3.2 °C/W junction-to-cathode thermal resistance. This enables sustained energy dissipation without external heatsinking-critical for compact battery-powered devices where board area and height are constrained.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Peak Reverse Voltage (VRWM) | 24 V - Must be ≥ nominal DC rail voltage (e.g., 24 V supply) to avoid leakage during normal operation. |
| Breakdown Voltage (VBR) @ 1 mA | 26.7–29.5 V - Defines onset of clamping; ensures reliable turn-on before downstream IC damage thresholds. |
| Clamping Voltage (VC) @ IPP = 5.1 A | 38.9 V - Maximum voltage seen by protected circuit during 10/1000 µs surge; determines safe margin for 40 V-rated components. |
| Peak Pulse Power (Ppk) | 200 W @ 10/1000 µs - Supports IEC 61000-4-5 Level 3 (1 A, 2 Ω source) surge immunity testing. |
| Response Time | < 1 ns - Fast enough to protect CMOS inputs and high-speed logic against ESD events per IEC 61000-4-2. |
| ESD Rating (HBM) | > 16 kV - Meets Class 3 ESD robustness for handheld and consumer interface ports. |
| Package Thermal Resistance (RJ-cathode) | 3.2 °C/W - Enables >23 W steady-state dissipation when cathode tab is soldered to ≥1 cm² 2-oz copper pour. |
Pinout & Package
1PMT24AT1 is housed in the POWERMITE® package (JEDEC DO-216AA), a surface-mount plastic case with integral metallic cathode tab for thermal and mechanical anchoring. Dimensions: 3.75 × 2.0 × 1.1 mm (L × W × H), footprint area 8.45 mm², cathode marked by polarity band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Cathode) | Transient current return path / heat sink interface | Full metallic bottom surface provides low-impedance thermal path to PCB; must be connected to large copper area for rated power handling. |
| 2 (Anode) | Reference node / surge current entry point | Connected to protected line (e.g., 24 V input); current flows anode→cathode during clamping event. |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile POWERMITE package | 1.1 mm max height enables use in ultra-thin portable enclosures where SMA or SMC packages exceed mechanical clearance limits. |
| Integral heatsink/locking tabs | Eliminates need for separate thermal vias or solder pads; improves mechanical retention during reflow and board flexure. |
| Full metallic cathode bottom | Prevents flux entrapment during soldering and ensures repeatable thermal performance across production batches. |
| JEDEC DO-216AA registration | Guarantees standardized footprint and solder profile compatibility across assembly lines and contract manufacturers. |
| Pb-free and RoHS compliant | Meets global environmental compliance requirements without derating or process change for lead-free reflow (260°C/10 s). |
Applications
| Industrial Power Input Protection | Automotive Body Control Module (BCM) Inputs |
|---|---|
Use Scenario: 24 V DC input stage of programmable logic controllers (PLCs) exposed to load dump and inductive switching transients. IC Role / Device Role / Timing Role: Unidirectional TVS clamping element placed between connector and upstream DC-DC converter input. Use Value: Limits transient voltage to ≤38.9 V, protecting 40 V-rated input MOSFETs and controller ICs while surviving 200 W surges per IEC 61000-4-5. |
Use Scenario: LIN bus or sensor supply line in BCM modules subject to ISO 7637-2 pulse 1/2a/3a transients. IC Role / Device Role / Timing Role: Reverse-polarity and surge protection device on 12–24 V auxiliary rails feeding microcontrollers and CAN transceivers. Use Value: Clamps 10/1000 µs pulses to safe levels within 1 ns, preserving signal integrity and preventing latch-up in automotive-grade MCUs. |
| Portable Medical Device Battery Charging Port | Point-of-Sale (POS) Terminal USB-C Power Input |
Use Scenario: 24 V charging input of handheld ultrasound or infusion pump with lithium-ion battery pack. IC Role / Device Role / Timing Role: Primary overvoltage suppression device ahead of buck converter and battery management IC. Use Value: 8.45 mm² footprint and 1.1 mm height allow placement directly at connector, minimizing trace inductance and improving ESD immunity per IEC 61000-4-2. |
Use Scenario: 24 V USB-C PD input stage in retail kiosks subjected to hot-plug and cable discharge events. IC Role / Device Role / Timing Role: First-line transient suppressor on VBUS line, coordinated with downstream polyfuse and load switch. Use Value: >16 kV HBM rating and sub-1 ns response prevent gate oxide damage in USB-C controller ICs during field-replaceable cable insertion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ24A | Same VRWM (24 V), but SMA package (4.5 × 2.7 × 2.2 mm); 400 W peak power (10/1000 µs); RJ-A = 50 °C/W vs. 3.2 °C/W (cathode). | Larger footprint and height; requires thermal vias for equivalent power handling; less suitable for ultra-thin designs. | Select when higher single-pulse energy rating is required and board space allows SMA footprint. |
| 1.5SMC24A | Same VRWM (24 V), SMC package (7.1 × 6.2 × 2.6 mm); 1500 W peak power (10/1000 µs); RJ-A = 15 °C/W. | Over 3× larger footprint; intended for industrial mains-level surge protection, not low-profile DC rails. | Select only for high-energy AC/DC front-end protection where 1PMT24AT1's 200 W rating is insufficient. |
Compared with SMAJ24A and 1.5SMC24A, the 1PMT24AT1 delivers superior thermal performance in minimal space-its 3.2 °C/W junction-to-cathode resistance enables 23 W continuous dissipation with simple PCB copper, whereas SMAJ24A requires thermal vias to achieve comparable steady-state capability.
Availability
1PMT24AT1 is available at Aetrix Electronics and suitable for industrial power input protection, automotive body control module (BCM) inputs, and portable medical device battery charging ports requiring stable component supply and long-term lifecycle support.
Supply support for 1PMT24AT1 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 1PMT24AT1 belongs to the 1PMT5.0AT1G/T3G Series of Zener transient voltage suppressors, engineered specifically for space-constrained, thermally demanding DC power rail protection in portable and automotive electronics.
FAQ
What is the maximum clamping voltage of the 1PMT24AT1 under standard surge conditions?
The 1PMT24AT1 has a maximum clamping voltage (VC) of 38.9 V when subjected to its rated peak pulse current of 5.1 A using the 10/1000 µs waveform. This value is measured per Figure 2 in the official datasheet and defines the upper voltage limit imposed on protected circuits during transient events. Designers must ensure downstream components have sufficient voltage margin above this clamping level. The 1PMT24AT1 maintains this performance due to its low Zener impedance and optimized junction design.
Is the 1PMT24AT1 suitable for bidirectional transient suppression?
No, the 1PMT24AT1 is a unidirectional TVS diode and conducts only during reverse-biased overvoltage events. It does not suppress positive transients on the anode side relative to cathode. For bidirectional protection-such as AC lines or data buses-two 1PMT24AT1 devices in series opposition or a dedicated bidirectional TVS like SMBJ24CA would be required. The 1PMT24AT1 datasheet explicitly specifies "Uni-Directional TVS" in its electrical characteristics table.
How does the POWERMITE package of the 1PMT24AT1 improve thermal performance compared to SMA?
The 1PMT24AT1's POWERMITE package achieves a junction-to-cathode thermal resistance (RJ-cathode) of 3.2 °C/W, significantly lower than typical SMA-packaged TVS diodes (~50 °C/W junction-to-ambient). This is enabled by its full metallic cathode tab, which bonds directly to PCB copper for efficient heat spreading. As a result, the 1PMT24AT1 can dissipate up to 23 W continuously at Ttab = 75°C-more than double what an SMA device can manage without thermal vias. This makes the 1PMT24AT1 ideal for compact, high-power-density designs.
What is the ESD robustness rating of the 1PMT24AT1, and how is it verified?
The 1PMT24AT1 is rated for >16 kV per the Human Body Model (HBM), classified as Class 3 per ANSI/ESDA/JEDEC JS-001. This rating is verified through standardized HBM testing at onsemi's qualified laboratories, where the device withstands multiple discharges at ±16 kV without parameter shift or functional failure. The robustness stems from its Zener junction design and low-leakage structure, making the 1PMT24AT1 suitable for protecting sensitive interfaces in handheld and medical electronics where user contact is frequent.
Can the 1PMT24AT1 replace the 1PMT24AT3G in a design?
Yes-the 1PMT24AT1 and 1PMT24AT3G share identical electrical specifications, thermal performance, and POWERMITE package dimensions; the only difference is tape-and-reel quantity (3,000 vs. 12,000 units per reel) and part marking (MLZ vs. MLZ-T3G). Both are Pb-free, RoHS-compliant, and manufactured to the same 1PMT5.0AT1G/T3G Series specification. No layout, thermal, or electrical redesign is needed when substituting 1PMT24AT1 for 1PMT24AT3G, and vice versa.
1PMT24AT1 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):
- 24V
- Voltage - Breakdown (Min):
- 26.7V
- Voltage - Clamping (Max) @ Ipp:
- 38.9V
- 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
1PMT24AT1 FAQ
1.How can I place an order for 1PMT24AT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1PMT24AT1 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 1PMT24AT1 reliable?
The price and inventory of 1PMT24AT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1PMT24AT1 is usually 5 days.
3.What payment methods are accepted for 1PMT24AT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1PMT24AT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1PMT24AT1?
1PMT24AT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1PMT24AT1 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 1PMT24AT1?
For technical support, including 1PMT24AT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1PMT24AT1 requirements.
6.How does Aetrix verify that 1PMT24AT1 is sourced from the original manufacturer or authorized distributors?
All 1PMT24AT1 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 1PMT24AT1 meets industry standards.
7.What is the process for return or replacement of 1PMT24AT1?
All 1PMT24AT1 units undergo pre-shipment inspection (PSI). If there is an issue with 1PMT24AT1, 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 1PMT24AT1 part is unused and in its original packaging.
Return procedure for 1PMT24AT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1PMT24AT1 Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
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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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