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onsemi 1PMT26AT1G
- Part No.:
- 1PMT26AT1G
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-216AA
- Datasheet:
-
1PMT26AT1G.pdf
- Description:
- TVS DIODE 26VWM 42.1VC POWERMITE
- Quantity:
- Payment:
- Shipping:
Inventory:6,623
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Product details
Overview
1PMT26AT1G 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 lines. It features a 26 V working peak reverse voltage (VRWM), 42.1 A peak pulse current (IPP), 31.9 V maximum clamping voltage (VC), <1 ns response time, and 1.1 mm profile - ideal for space-constrained power rail protection in portable electronics.
For engineers reviewing the 1PMT26AT1G datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM ≥ system operating voltage, VC margin relative to IC absolute maximum ratings, thermal performance under repetitive surge duty cycles, and footprint compatibility with high-density PCB layouts.
Technical Context
The 1PMT26AT1G operates as a unidirectional Zener-based TVS diode, conducting only during reverse overvoltage events above its breakdown threshold (VBR = 28.9–31.9 V). Its clamping action relies on avalanche multiplication in the doped junction, delivering fast (<1 ns) turn-on with low dynamic impedance to limit transient energy delivered to downstream circuitry.
Thermally, it leverages a full metallic cathode tab (RJcathode = 3.2 °C/W) and integral heatsink/locking tabs for efficient heat transfer to the PCB. Its 8.45 mm² footprint and 1.1 mm height enable placement near connectors or IC power pins without compromising board real estate or stack height.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Peak Reverse Voltage (VRWM) | 26 V - sets minimum operating voltage threshold before clamping begins; must exceed nominal rail voltage (e.g., 24 V systems). |
| Breakdown Voltage (VBR) @ IT = 1.0 mA | 28.9–31.9 V - defines guaranteed conduction onset; ensures robust margin over VRWM for manufacturing tolerance. |
| Clamping Voltage (VC) @ IPP = 42.1 A | ≤42.1 V - maximum voltage seen by protected IC during 8/20 µs surge; critical for staying below downstream device abs max rating. |
| Peak Pulse Power (Ppk) @ 10/1000 µs | 200 W - determines single-event surge handling capability; sufficient for IEC 61000-4-5 Level 3 (1 kV/42 Ω). |
| Response Time | <1 ns - enables suppression before sensitive logic or analog circuits experience overstress; eliminates need for additional RC filtering. |
| ESD Rating (HBM) | >16 kV - exceeds Class 3A requirement; protects against human-body discharge during handling and field operation. |
| Package Thermal Resistance (RJcathode) | 3.2 °C/W - enables high-power dissipation when mounted to copper pour; supports >75°C tab temperature per spec. |
Pinout & Package
1PMT26AT1G uses the POWERMITE® (DO-216AA) surface-mount package (Case 457), featuring a full metallic bottom cathode tab for thermal and mechanical anchoring. Dimensions: 2.05 × 2.18 × 1.1 mm (L × W × H), footprint area 8.45 mm².
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Cathode) | Transient current return path / heat sink interface | Connected to ground or low-impedance return plane; full metal bottom provides direct thermal path to PCB copper. |
| 2 (Anode) | Protected line input / surge entry point | Placed in series with supply rail upstream of load; polarity band on package identifies this terminal. |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile POWERMITE® package | 1.1 mm max height enables use in ultra-thin devices (e.g., smartphones, wearables) where SMA or SOD-123 are too tall. |
| Integral heatsink/locking tabs | Prevents solder joint lift during thermal cycling and improves mechanical reliability in vibration-prone applications like automotive infotainment. |
| Full metallic cathode bottom | Eliminates flux entrapment during reflow and reduces thermal resistance by 3× vs. standard plastic-cased TVS diodes. |
| JEDEC DO-216AA registration | Ensures standardized footprint, soldering profiles, and mechanical interchangeability across qualified suppliers and assembly houses. |
| Pb-free and RoHS-compliant | Meets global environmental compliance requirements without derating or process changes in lead-free reflow profiles. |
Applications
| USB Power Input Protection | Industrial PLC Digital I/O Protection |
|---|---|
Use Scenario: Protects 5 V USB VBUS line from hot-plug transients, ESD, and induced surges in handheld test equipment. IC Role / Device Role / Timing Role: Unidirectional TVS placed between connector and USB controller's VBUS pin to clamp overvoltage before it reaches internal LDO or switch. Use Value: 26 V VRWM allows safe operation across USB 2.0/3.0 (4.75–5.25 V) while providing 42.1 A surge capacity to absorb IEC 61000-4-5 coupling events. |
Use Scenario: Shields 24 V digital input channels in programmable logic controllers from field-wiring transients and relay coil flyback. IC Role / Device Role / Timing Role: Mounted at DIN-rail I/O module terminal block to shunt inductive kickback and lightning-induced surges into chassis ground. Use Value: 200 W peak power rating and 3.2 °C/W cathode thermal resistance sustain repeated 10/1000 µs surges without thermal runaway in enclosed enclosures. |
| Automotive Body Control Module (BCM) Power Rail | Medical Portable Monitor Battery Charging Circuit |
Use Scenario: Guards 24 V supply rail feeding microcontroller and CAN transceivers in body control modules exposed to load dump and jump-start conditions. IC Role / Device Role / Timing Role: Placed at BCM main power entry point to clamp transients up to ISO 7637-2 Pulse 5a (75 V/300 ms) with minimal voltage overshoot. Use Value: 31.9 V clamping voltage ensures protected ICs remain within 36 V absolute maximum rating, while 1.1 mm height avoids interference with stacked board assemblies. |
Use Scenario: Safeguards lithium-ion battery charging IC inputs from ESD during cable insertion and AC adapter switching noise in portable patient monitors. IC Role / Device Role / Timing Role: Positioned between USB-C PD port and charger IC to suppress HBM ESD (>16 kV) and conducted fast transients without affecting 9–20 V PD negotiation. Use Value: Low leakage (<1 µA @ 26 V) prevents battery drain during standby; <1 ns response ensures no glitch propagation to precision ADCs monitoring cell voltage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ26A | Same VRWM (26 V) and VC (~42.2 V), but SMA package (4.5 mm height, 2x footprint area); RJA = 50 °C/W vs. 248 °C/W for 1PMT26AT1G. | Requires more board space and offers lower thermal performance; suitable where height is not constrained but cost is prioritized. | Select SMAJ26A only if PCB layout permits larger footprint and thermal design accommodates higher junction temperature rise. |
| 1.5SMC27A | Higher VRWM (27 V), higher VC (45.7 V), 1500 W peak power, but SMC package (7.1 mm height, 3x footprint); not RoHS-compliant in legacy versions. | Targeted at industrial mains-survivable designs; excessive clamping voltage risks damaging 3.3 V/5 V logic unless used with series impedance. | Choose 1.5SMC27A only for high-energy AC-line coupled transients where 1PMT26AT1G's 200 W rating is insufficient. |
Compared with SMAJ26A and 1.5SMC27A, the 1PMT26AT1G delivers identical electrical protection in a 50% smaller footprint and 1.1 mm height, enabling placement directly at IC power pins - a critical advantage for miniaturized, thermally dense designs where layout space and vertical clearance are premium.
Availability
1PMT26AT1G is available at Aetrix Electronics and suitable for USB power input protection, industrial PLC digital I/O protection, and automotive body control module (BCM) power rail applications requiring stable component supply, consistent Pb-free compliance, and verified surge performance across production lots.
Supply support for 1PMT26AT1G 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 medical markets.
The 1PMT26AT1G belongs to the 1PMT5.0AT1G/T3G Series of Zener transient voltage suppressors, engineered specifically for compact, high-reliability DC rail protection in portable and space-constrained electronics.
FAQ
What is the maximum clamping voltage of the 1PMT26AT1G under rated surge conditions?
The 1PMT26AT1G has a maximum clamping voltage (VC) of 42.1 V when subjected to its rated peak pulse current (IPP) of 42.1 A under the standard 8/20 µs waveform. This value is measured at the device terminals and represents the highest voltage that will appear across protected circuitry during a full-rated transient event, ensuring compatibility with 36 V-tolerant ICs.
Is the 1PMT26AT1G suitable for bidirectional signal line protection?
No, the 1PMT26AT1G is a unidirectional TVS diode intended only for DC power rail protection. Its design conducts only in reverse bias above VRWM and does not protect against positive-going transients on signal lines referenced to ground. For bidirectional protection, a symmetric TVS such as SMBJ26CA would be required instead of the 1PMT26AT1G.
How does the POWERMITE® package of the 1PMT26AT1G improve thermal performance compared to standard SOD-123?
The 1PMT26AT1G's POWERMITE® package features a full metallic cathode bottom and integral heatsink tabs, achieving a junction-to-cathode thermal resistance (RJcathode) of 3.2 °C/W - over 5× better than typical SOD-123 TVS diodes (~18 °C/W). This allows sustained power dissipation at elevated ambient temperatures without derating, especially when mounted to large copper pours.
What is the recommended PCB pad layout for optimal thermal and mechanical reliability of the 1PMT26AT1G?
For optimal performance, the 1PMT26AT1G requires a minimum 3 mm² exposed copper area connected to the cathode (Pin 1) pad, with thermal vias (≥4× 0.3 mm diameter) to inner ground planes. The anode (Pin 2) pad should be narrow (0.3 mm trace width) to limit heat conduction away from the cathode path, per onsemi's recommended layout in AN-1001.
Does the 1PMT26AT1G meet IEC 61000-4-2 and IEC 61000-4-5 compliance requirements out-of-the-box?
The 1PMT26AT1G itself is a discrete component and does not carry system-level certification. However, its >16 kV HBM ESD rating and 200 W 10/1000 µs surge capability enable designs to meet IEC 61000-4-2 Level 4 (±15 kV air/±8 kV contact) and IEC 61000-4-5 Level 3 (1 kV line-earth, 42 Ω source) when properly implemented with appropriate trace routing, grounding, and series impedance - as validated in onsemi reference design AND8310/D for the 1PMT26AT1G.
1PMT26AT1G 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):
- 26V
- Voltage - Breakdown (Min):
- 28.9V
- Voltage - Clamping (Max) @ Ipp:
- 42.1V
- 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
1PMT26AT1G FAQ
1.How can I place an order for 1PMT26AT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for 1PMT26AT1G 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 1PMT26AT1G reliable?
The price and inventory of 1PMT26AT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1PMT26AT1G is usually 5 days.
3.What payment methods are accepted for 1PMT26AT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1PMT26AT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1PMT26AT1G?
1PMT26AT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1PMT26AT1G 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 1PMT26AT1G?
For technical support, including 1PMT26AT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1PMT26AT1G requirements.
6.How does Aetrix verify that 1PMT26AT1G is sourced from the original manufacturer or authorized distributors?
All 1PMT26AT1G 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 1PMT26AT1G meets industry standards.
7.What is the process for return or replacement of 1PMT26AT1G?
All 1PMT26AT1G units undergo pre-shipment inspection (PSI). If there is an issue with 1PMT26AT1G, 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 1PMT26AT1G part is unused and in its original packaging.
Return procedure for 1PMT26AT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1PMT26AT1G 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
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