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Microchip Technology 1PMT5945AE3/TR7
- Part No.:
- 1PMT5945AE3/TR7
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-216AA
- Datasheet:
-
1PMT5945AE3/TR7.pdf
- Description:
- DIODE ZENER 68V 3W DO216AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,702
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Product details
Overview
1PMT5945AE3/TR7 from Microsemi is a 68 V, ±5% tolerance surface-mount Zener diode in the Powermite® package, rated for 3.0 W DC power dissipation at TAB 1 temperature of 60°C, with 5.5 mA test current (IZT), 120 Ω dynamic impedance (ZZT), and <1 µA reverse leakage at 51.2 V. It serves as a precision voltage reference or overvoltage clamp in DC power rails and regulator feedback paths.
For engineers reviewing the 1PMT5945AE3/TR7 datasheet, 1PMT5945AE3/TR7 pinout, 1PMT5945AE3/TR7 application, or 1PMT5945AE3/TR7 equivalent, key selection criteria include zener voltage tolerance, thermal resistance (30°C/W junction-to-TAB), ESD rating (>16 kV HBM), low knee impedance, and compatibility with automated SMT assembly using EIA-481 tape-and-reel packaging.
Technical Context
This device operates as a two-terminal voltage-regulating diode with sharp reverse-breakdown characteristics. Its Powermite® package integrates a full metallic bottom and locking tab to enhance thermal conduction and mechanical stability during reflow soldering.
The 1PMT5945AE3/TR7 exhibits 68 V nominal zener voltage measured at 5.5 mA IZT with 30°C case temperature, 120 Ω dynamic impedance at IZT, and 1700 Ω knee impedance at 0.25 mA IZK - confirming stable regulation across low- and mid-current operating ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 68 V ±5% at 5.5 mA IZT - defines precise clamping/reference level under standard test conditions |
| Power Dissipation | 3.0 W at TAB 1 = 60°C - sets maximum continuous DC power handling with defined thermal boundary |
| Dynamic Impedance (ZZT) | 120 Ω at IZT - determines output voltage variation under small-signal AC load changes |
| Knee Impedance (ZZK) | 1700 Ω at 0.25 mA IZK - indicates regulation onset sharpness and low-current stability |
| Thermal Resistance | 30°C/W junction-to-TAB1 - quantifies thermal path efficiency for heatsinking via mounting tab |
| ESD Rating | >16 kV per Human Body Model - ensures robustness against common electrostatic discharge events |
| Reverse Leakage | <1 µA at 51.2 V VR - guarantees minimal standby current in high-impedance bias or sensing circuits |
Pinout & Package
Package: Powermite® surface-mount molded package with full metallic bottom and integral heat sink locking tab; cathode designated by TAB 1; DO-216 outline; weight ≈ 0.016 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TAB 1 | Cathode | Primary heat-dissipating terminal and electrical cathode connection; must be thermally anchored to PCB copper for rated power operation |
| Lead 2 | Anode | Standard anode connection; electrically isolated from TAB 1; used for forward bias or reverse-bias circuit integration |
Key Features
| Feature | Design Value |
|---|---|
| Surface-mount Powermite® package | Enables automated placement and reflow while delivering 3 W power handling in footprint smaller than DO-41 |
| Full metallic bottom | Eliminates solder flux entrapment during assembly, improving long-term reliability and void-free solder joints |
| Integral heat sink locking tab | Provides mechanical retention and direct thermal path from junction to PCB, reducing thermal resistance to 30°C/W |
| EIA-481 tape-and-reel packaging | Supports high-volume SMT line feeding with 3,000 units per 7-inch reel |
| ESD robustness | >16 kV HBM rating allows safe handling and operation in unshielded industrial environments |
Applications
| DC Power Rail Clamping | Feedback Reference in SMPS |
|---|---|
Use Scenario: Protecting 48 V telecom line cards from transient surges exceeding 80 V. IC Role / Device Role / Timing Role: Zener clamping element shunting excess energy to ground when input exceeds 68 V. Use Value: Maintains system integrity by limiting rail voltage to ≤75 V peak with <1 µA leakage below clamp threshold. | Use Scenario: Providing stable reference voltage to error amplifier in isolated flyback converter. IC Role / Device Role / Timing Role: Precision voltage reference setting regulated output via optocoupler feedback loop. Use Value: Enables ±5% output regulation accuracy with 120 Ω dynamic impedance minimizing load-induced drift. |
| Industrial Sensor Biasing | Overvoltage Protection in PLC I/O Modules |
Use Scenario: Biasing bridge sensors in 24 V industrial transmitters requiring stable excitation. IC Role / Device Role / Timing Role: Zener-based voltage reference generating clean 68 V auxiliary supply for signal conditioning. Use Value: Delivers low-noise, low-drift reference with 1700 Ω knee impedance ensuring regulation onset at microamp-level currents. | Use Scenario: Safeguarding analog input channels in programmable logic controllers exposed to field wiring faults. IC Role / Device Role / Timing Role: Primary overvoltage clamp absorbing fault energy before front-end op-amps. Use Value: Withstands repeated 100 V transients due to 3 W power rating and 30°C/W thermal resistance to PCB copper. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5945B | Same 68 V VZ and ±5% tolerance, but in DO-41 through-hole package; no metallic bottom or locking tab; thermal resistance ~65°C/W | Requires manual or wave soldering; unsuitable for high-density SMT layouts or automated production lines | Select 1N5945B only if legacy through-hole assembly or higher thermal margin at lower power is acceptable |
| BZX84-C68 | 68 V ±5% in SOT-23; rated 300 mW; 80 Ω ZZT at 5 mA; thermal resistance ~300°C/W junction-to-air | Limited to low-power biasing; cannot sustain 3 W without external heatsink or forced cooling | Choose BZX84-C68 only for space-constrained low-power circuits where 3 W capability is unnecessary |
Compared with 1PMT5945AE3/TR7, 1N5945B offers identical electrical specs but lacks SMT compatibility and thermal performance, while BZX84-C68 provides SMT fit but sacrifices >90% of power handling and thermal efficiency - making 1PMT5945AE3/TR7 uniquely suited for high-reliability, high-power SMT voltage regulation.
Availability
1PMT5945AE3/TR7 is available at Aetrix Electronics and suitable for DC power rail clamping, SMPS feedback referencing, and industrial sensor biasing requiring stable component supply across automotive-grade temperature range (-55°C to +150°C).
Supply support for 1PMT5945AE3/TR7 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
Microsemi (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability analog, mixed-signal, and radiation-hardened components for aerospace, defense, and industrial markets.
The Powermite® Zener diode product line was engineered to deliver high-power surface-mount voltage regulation with superior thermal performance and assembly robustness - specifically targeting next-generation power supplies and ruggedized control systems.
FAQ
What is the zener voltage tolerance for 1PMT5945AE3/TR7?
The 1PMT5945AE3/TR7 has a nominal zener voltage of 68 V with a standard tolerance of ±5%, as specified in the MSC0995 datasheet. Tighter tolerances (±2% and ±1%) are available with suffixes C and D, respectively, but the E3/TR7 variant uses the standard ±5% grade. This tolerance applies under test conditions of 5.5 mA IZT and 30°C case temperature.
How is thermal management handled in the 1PMT5945AE3/TR7 package?
The 1PMT5945AE3/TR7 uses the Powermite® package with a full metallic bottom and integral locking tab that acts as a primary heat sink. Its thermal resistance is 30°C/W junction-to-TAB1, meaning effective thermal performance depends on mounting TAB 1 to adequately sized PCB copper. This design enables 3.0 W power dissipation at 60°C TAB temperature - significantly better than standard SOT or DO packages.
Is the 1PMT5945AE3/TR7 compatible with automated SMT assembly?
Yes, the 1PMT5945AE3/TR7 is fully compatible with automated insertion and reflow soldering equipment. It ships in EIA-481 tape-and-reel format (3,000 units per 7-inch reel), and its Powermite® package features a unique locking tab and flux-free metallic bottom - both designed to prevent misalignment and flux entrapment during high-speed placement and reflow.
What is the maximum reverse leakage current for 1PMT5945AE3/TR7?
The maximum reverse leakage current (IR) for 1PMT5945AE3/TR7 is less than 1 µA at a reverse voltage (VR) of 51.2 V, as specified in the MSC0995 datasheet. This low leakage supports high-impedance applications such as precision voltage references and sensor bias networks where standby current must be minimized.
Does the 1PMT5945AE3/TR7 meet any ESD standards?
Yes, the 1PMT5945AE3/TR7 is rated for >16 kV per the Human Body Model (HBM) ESD test, as documented in the MSC0995 datasheet. This high ESD immunity makes it suitable for use in industrial environments and manufacturing settings where static discharge risk is elevated, without requiring additional external protection circuitry.
1PMT5945AE3/TR7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-216AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 68 V
- Tolerance:
- ±10%
- Power - Max:
- 3 W
- Impedance (Max) (Zzt):
- 120 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 51.2 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.2 V @ 200 mA
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-216AA
1PMT5945AE3/TR7 FAQ
1.How can I place an order for 1PMT5945AE3/TR7 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1PMT5945AE3/TR7 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 1PMT5945AE3/TR7 reliable?
The price and inventory of 1PMT5945AE3/TR7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1PMT5945AE3/TR7 is usually 5 days.
3.What payment methods are accepted for 1PMT5945AE3/TR7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1PMT5945AE3/TR7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1PMT5945AE3/TR7?
1PMT5945AE3/TR7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1PMT5945AE3/TR7 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 1PMT5945AE3/TR7?
For technical support, including 1PMT5945AE3/TR7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1PMT5945AE3/TR7 requirements.
6.How does Aetrix verify that 1PMT5945AE3/TR7 is sourced from the original manufacturer or authorized distributors?
All 1PMT5945AE3/TR7 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 1PMT5945AE3/TR7 meets industry standards.
7.What is the process for return or replacement of 1PMT5945AE3/TR7?
All 1PMT5945AE3/TR7 units undergo pre-shipment inspection (PSI). If there is an issue with 1PMT5945AE3/TR7, 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 1PMT5945AE3/TR7 part is unused and in its original packaging.
Return procedure for 1PMT5945AE3/TR7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1PMT5945AE3/TR7 Tags
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MMBZ5240B-7-F
Diodes Incorporated
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