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Microchip Technology 1PMT5945E3/TR7
- Part No.:
- 1PMT5945E3/TR7
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-216AA
- Datasheet:
-
1PMT5945E3/TR7.pdf
- Description:
- DIODE ZENER 68V 3W DO216AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,249
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Product details
Overview
1PMT5945E3/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 = 60°C, with 120 Ω dynamic impedance at 5.5 mA test current and 1700 µA max reverse leakage at 51.2 V. It serves as a precision voltage reference or overvoltage clamp in power supply regulation circuits.
For engineers reviewing the 1PMT5945E3/TR7 datasheet, 1PMT5945E3/TR7 pinout, 1PMT5945E3/TR7 application, or 1PMT5945E3/TR7 equivalent, key selection criteria include zener voltage accuracy, thermal resistance (30°C/W junction-to-TAB), ESD robustness (>16 kV HBM), low knee impedance, and compatibility with automated SMT assembly.
Technical Context
This Zener diode operates in reverse breakdown mode with tightly controlled voltage regulation across its specified test current range. Its Powermite® package integrates a full metallic bottom and locking tab to enhance thermal conduction and mechanical stability during reflow soldering.
The device exhibits low reverse leakage (≤1700 µA at VR = 51.2 V), a knee impedance of ≤1700 Ω at IZK = 0.25 mA, and maintains stable zener voltage under transient thermal loads due to its 30°C/W junction-to-TAB thermal resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 68 V ±5% at IZT = 5.5 mA - defines nominal clamping/reference level |
| Power Dissipation | 3.0 W at TAB 1 = 60°C - sets maximum continuous thermal load capacity |
| Dynamic Impedance (ZZT) | 120 Ω at IZT = 5.5 mA - determines voltage regulation sensitivity to current changes |
| Knee Impedance (ZZK) | ≤1700 Ω at IZK = 0.25 mA - indicates low-current regulation capability |
| Reverse Leakage (IR) | ≤1700 µA at VR = 51.2 V - defines off-state power loss and noise floor |
| Thermal Resistance | 30°C/W junction-to-TAB - enables thermal design using TAB as primary heat path |
| ESD Rating | >16 kV per Human Body Model - ensures robustness during handling and board assembly |
Pinout & Package
Package: Powermite® surface-mount molded package with full metallic bottom and integral heat-sink locking tab; cathode designated by TAB 1; mounting position unrestricted; weight ≈0.016 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TAB 1 | Cathode | Primary thermal and electrical connection point; must be soldered to copper pour for thermal management |
| Lead 2 | Anode | Standard anode terminal; electrically isolated from TAB 1; used for circuit return path |
Key Features
| Feature | Design Value |
|---|---|
| Surface-mount Powermite® package | Enables high-density PCB layout and compatibility with automated pick-and-place equipment |
| Integral heat-sink locking tab | Improves thermal transfer efficiency and mechanical retention during thermal cycling |
| Full metallic bottom | Eliminates solder flux entrapment risk and enhances thermal conductivity to PCB |
| ESD rating >16 kV HBM | Reduces need for external ESD protection in sensitive input stages |
| Low reverse leakage (≤1700 µA) | Minimizes standby power loss in battery-backed or low-power systems |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Used in optocoupler-coupled feedback loop of isolated DC-DC converters to regulate output voltage. IC Role / Device Role / Timing Role: Precision voltage reference establishing error threshold for TL431 or similar shunt regulator. Use Value: 68 V rating allows safe margin above 48 V rail; ±5% tolerance ensures stable regulation without trimming. | Use Scenario: Placed across DC bus to limit transient overvoltage spikes from inductive switching or lightning surges. IC Role / Device Role / Timing Role: Fast-acting voltage clamp diverting excess energy to ground before downstream ICs are damaged. Use Value: 3.0 W power rating sustains short-duration transients; 30°C/W thermal resistance supports reliable energy dissipation into PCB copper. |
| Industrial Sensor Signal Conditioning | Programmable Logic Controller Input Protection |
Use Scenario: Protects analog front-end inputs of 24 V industrial sensors against ESD and cable-induced surges. IC Role / Device Role / Timing Role: Primary ESD suppression element at signal entry point, preceding RC filter and amplifier. Use Value: >16 kV HBM rating exceeds IEC 61000-4-2 Level 4; low leakage preserves sensor offset accuracy. | Use Scenario: Mounted on PLC digital input module to clamp field-wire induced transients before opto-isolator input. IC Role / Device Role / Timing Role: Robust overvoltage limiter ensuring logic-level integrity despite long wiring runs and inductive loads. Use Value: Powermite® package withstands repeated surge events; metallic bottom improves grounding reliability in noisy factory environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5365B | Same 68 V nominal, but DO-204AL package; higher thermal resistance (50°C/W); no metallic bottom | Limited to lower-power or non-automated assembly; less effective heat spreading | Choose when legacy through-hole footprint or cost sensitivity outweighs thermal performance needs |
| BZX84-C68 | SOT-23 package; 68 V ±5%; 300 mW rating; 10× lower power handling than 1PMT5945E3/TR7 | Only suitable for signal-level clamping, not power rail protection | Choose only for low-energy signal line protection where space is critical and power dissipation <0.3 W |
Compared with 1N5365B and BZX84-C68, the 1PMT5945E3/TR7 delivers superior thermal performance and automated assembly compatibility via its Powermite® package, enabling reliable 3.0 W operation in compact industrial power designs where sustained clamping duty is required.
Availability
1PMT5945E3/TR7 is available at Aetrix Electronics and suitable for switch-mode power supplies, industrial overvoltage protection circuits, and programmable logic controller input stages requiring stable component supply and consistent Zener voltage performance.
Supply support for 1PMT5945E3/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 semiconductor manufacturer specializing in high-reliability analog, mixed-signal, and radiation-hardened components for aerospace, defense, and industrial markets.
The Powermite® Zener diode product line was designed for high-power-density, thermally demanding applications where traditional axial or DO-41 packages cannot meet thermal or automation requirements.
FAQ
What is the zener voltage tolerance for 1PMT5945E3/TR7?
The 1PMT5945E3/TR7 has a standard zener voltage tolerance of ±5% at 68 V, measured at IZT = 5.5 mA with TAB 1 temperature held at 30°C. Tighter tolerances (±2%, ±1%) are available with suffixes C and D, but the base part number 1PMT5945E3/TR7 uses the ±5% grade.
Can 1PMT5945E3/TR7 be used in automated SMT assembly?
Yes, the 1PMT5945E3/TR7 is specifically designed for automated insertion and reflow soldering. Its Powermite® package features a unique locking tab and full metallic bottom that ensure mechanical stability and eliminate solder flux entrapment-key requirements for high-yield SMT production lines.
What is the maximum power dissipation for 1PMT5945E3/TR7?
The 1PMT5945E3/TR7 is rated for 3.0 W DC power dissipation when TAB 1 is maintained at 60°C. This rating assumes proper thermal management via soldering TAB 1 to a sufficient copper area; derating is required at higher ambient or TAB temperatures per the device's thermal resistance of 30°C/W.
How does the thermal resistance of 1PMT5945E3/TR7 affect PCB layout?
The 1PMT5945E3/TR7 has a junction-to-TAB thermal resistance of 30°C/W, meaning TAB 1 is the primary heat conduction path. Effective PCB layout requires connecting TAB 1 to a large, thermally robust copper pour-ideally with multiple thermal vias-to maintain safe junction temperature under 3.0 W load.
Is 1PMT5945E3/TR7 suitable for ESD protection in industrial environments?
Yes, the 1PMT5945E3/TR7 is rated for >16 kV per Human Body Model (HBM), making it suitable for primary or secondary ESD protection in industrial interfaces. Its 3.0 W power rating and low leakage (<1700 µA) allow it to absorb repetitive ESD events while preserving signal integrity in harsh environments.
1PMT5945E3/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:
- ±20%
- 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
1PMT5945E3/TR7 FAQ
1.How can I place an order for 1PMT5945E3/TR7 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1PMT5945E3/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 1PMT5945E3/TR7 reliable?
The price and inventory of 1PMT5945E3/TR7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1PMT5945E3/TR7 is usually 5 days.
3.What payment methods are accepted for 1PMT5945E3/TR7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1PMT5945E3/TR7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1PMT5945E3/TR7?
1PMT5945E3/TR7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1PMT5945E3/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 1PMT5945E3/TR7?
For technical support, including 1PMT5945E3/TR7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1PMT5945E3/TR7 requirements.
6.How does Aetrix verify that 1PMT5945E3/TR7 is sourced from the original manufacturer or authorized distributors?
All 1PMT5945E3/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 1PMT5945E3/TR7 meets industry standards.
7.What is the process for return or replacement of 1PMT5945E3/TR7?
All 1PMT5945E3/TR7 units undergo pre-shipment inspection (PSI). If there is an issue with 1PMT5945E3/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 1PMT5945E3/TR7 part is unused and in its original packaging.
Return procedure for 1PMT5945E3/TR7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1PMT5945E3/TR7 Tags
-
MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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BZT52C15-7-F
Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
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SMAJ4744A-TP
Micro Commercial Co
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BZT52C3V6LP-7
Diodes Incorporated
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SMAZ12-13-F
Diodes Incorporated
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