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Microchip Technology 1PMT5945C/TR7
- Part No.:
- 1PMT5945C/TR7
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-216AA
- Datasheet:
-
1PMT5945C/TR7.pdf
- Description:
- DIODE ZENER 68V 3W DO216AA
- Quantity:
- Payment:
- Shipping:
Inventory:4,621
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Product details
Overview
1PMT5945C/TR7 from Microsemi is a 68 V, ±1% tolerance Zener diode in the Powermite® surface-mount 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 thermal resistance of 30°C/W junction-to-tab. It serves as a precision voltage reference or overvoltage clamp in power supply regulation and ESD-protected interface circuits.
For engineers reviewing the 1PMT5945C/TR7 datasheet, 1PMT5945C/TR7 pinout, 1PMT5945C/TR7 application, or 1PMT5945C/TR7 equivalent, key selection criteria include its tight 1% Zener voltage tolerance, 16 kV HBM ESD rating, full metallic bottom for flux-free assembly, integral heat sink tab, and DO-216 mechanical outline compatibility with automated placement equipment.
Technical Context
This Zener diode operates in reverse breakdown mode with a nominal Zener voltage of 68 V at 5.5 mA (IZT), exhibiting low knee impedance (1700 Ω at 0.25 mA) and controlled dynamic impedance (120 Ω). Its thermal design centers on direct junction-to-tab conduction via a full metallic bottom and locking tab, enabling 3.0 W power handling without external heatsinking when TAB 1 is maintained at ≤60°C.
The device complies with EIA-481 tape-and-reel packaging (7" reel, 3000 pcs), supports any mounting orientation, and features cathode identification via TAB 1. Its 16 kV HBM ESD rating and low reverse leakage (<1 µA at 51.2 V) support robust operation in transient-prone industrial and telecom interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 68 V ±1% at IZT = 5.5 mA - enables precise voltage clamping or reference within 0.68 V absolute error. |
| Power Dissipation | 3.0 W at TAB 1 = 60°C - supports high-energy transient suppression without derating in compact layouts. |
| Dynamic Impedance (ZZT) | 120 Ω at IZT - ensures stable regulation under moderate load current variation. |
| Thermal Resistance | 30°C/W junction-to-TAB 1 - allows accurate thermal modeling when tab is connected to PCB copper pour. |
| ESD Rating | >16 kV per HBM - provides intrinsic protection against human-body electrostatic discharge during handling and operation. |
| Reverse Leakage | <1 µA at VR = 51.2 V - minimizes standby power loss in high-impedance bias networks. |
| Knee Impedance (ZZK) | 1700 Ω at IZK = 0.25 mA - defines usable regulation range onset below nominal test current. |
Pinout & Package
Package: Powermite® (DO-216), molded surface-mount package with full metallic bottom and integral heat sink locking tab; cathode designated by TAB 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TAB 1 | Cathode | Primary heat path and voltage reference node; must be soldered to thermal pad for rated 3.0 W operation. |
| Lead 2 | Anode | Standard anode connection; electrically isolated from tab; used for circuit return path. |
Key Features
| Feature | Design Value |
|---|---|
| Full metallic bottom | Eliminates solder flux entrapment during reflow, improving long-term reliability and void-free solder joints. |
| Integral heat sink locking tab | Provides mechanical anchoring and direct thermal conduction path from junction to PCB, enabling 3.0 W operation without external heatsink. |
| ±1% Zener voltage tolerance (suffix C) | Reduces need for post-production calibration in precision reference applications such as ADC voltage references or sensor excitation. |
| ESD rating >16 kV HBM | Permits direct integration into unshielded front-end interfaces (e.g., RS-485, CAN bus nodes) without additional TVS staging. |
| DO-216 mechanical outline | Ensures compatibility with standard SMT pick-and-place nozzles and stencil apertures used for 0805–1206-sized passives. |
Applications
| Industrial Power Supply Regulation | Telecom Line Interface Protection |
|---|---|
Use Scenario: Clamping transient surges on 48 V DC distribution rails in programmable logic controllers and motor drives. IC Role / Device Role / Timing Role: Zener diode acting as shunt overvoltage protector, triggered above 68 V to divert surge energy to ground. Use Value: 3.0 W power rating and 30°C/W thermal resistance allow sustained clamping without thermal runaway when TAB 1 is thermally anchored. | Use Scenario: Protecting RS-485 transceiver inputs against induced lightning surges on outdoor telecom links. IC Role / Device Role / Timing Role: Primary ESD and surge clamp at signal line entry point, leveraging 16 kV HBM rating and fast Zener turn-on. Use Value: Low 1 µA reverse leakage at 51.2 V preserves signal integrity in high-impedance receiver bias networks. |
| Automotive Body Control Module Reference | Medical Sensor Excitation Circuit |
Use Scenario: Providing stable 68 V bias for high-side switch gate drivers in 24 V vehicle battery systems. IC Role / Device Role / Timing Role: Precision voltage reference source with ±1% tolerance ensuring consistent driver threshold across temperature. Use Value: Tight 1% tolerance (suffix C) eliminates need for trimming resistors, reducing BOM count and calibration steps. | Use Scenario: Generating calibrated excitation voltage for strain-gauge bridges in portable diagnostic devices. IC Role / Device Role / Timing Role: Low-drift Zener reference supplying constant current through bridge legs. Use Value: 120 Ω dynamic impedance maintains regulation stability despite small current variations from bridge imbalance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C68LT1G | 250 mW SOT-23 package; 68 V ±5%; 40 Ω ZZT at 5 mA; no metallic tab or integral heatsink. | Limited to low-power bias/reference use; unsuitable for 3 W surge clamping or thermal-intensive regulation. | Select only for space-constrained, low-power designs where thermal performance is secondary. |
| SMBJ68A | 68 V unidirectional TVS; 600 W peak pulse power; 100 V VRWM; higher clamping voltage (113 V) than Zener knee. | Designed for transient suppression, not precision regulation; lacks tight voltage tolerance or low-leakage DC characteristics. | Choose for high-energy lightning/surge events; avoid where stable DC reference or low-leakage operation is required. |
Compared with BZX84-C68LT1G and SMBJ68A, the 1PMT5945C/TR7 uniquely delivers 3.0 W continuous Zener regulation with ±1% tolerance and integrated thermal management-making it suitable for precision, high-power, and ESD-critical roles where alternatives fall short in either accuracy, power handling, or reliability.
Availability
1PMT5945C/TR7 is available at Aetrix Electronics and suitable for industrial power supply regulation, telecom line interface protection, and automotive body control module reference requiring stable component supply and traceable sourcing.
Supply support for 1PMT5945C/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 for high-power surface-mount voltage regulation and transient suppression in space-constrained, thermally demanding environments-emphasizing robust packaging, precision tolerance, and ESD resilience.
FAQ
What is the Zener voltage tolerance for 1PMT5945C/TR7?
The "C" suffix in 1PMT5945C/TR7 denotes a ±1% Zener voltage tolerance at 68 V, measured at 5.5 mA test current and TAB 1 temperature of 30°C. This tighter tolerance improves accuracy in precision reference and regulation applications compared to standard ±5% versions like 1PMT5945B/TR7.
How is thermal performance managed in the 1PMT5945C/TR7 package?
The 1PMT5945C/TR7 uses a Powermite® package with a full metallic bottom and integral locking tab that serves as both mechanical anchor and primary thermal path. Its specified 30°C/W junction-to-TAB 1 thermal resistance enables 3.0 W continuous operation when TAB 1 is held at ≤60°C-requiring direct soldering to a thermal pad on the PCB.
Does 1PMT5945C/TR7 have ESD protection built-in?
Yes, the 1PMT5945C/TR7 has an ESD rating exceeding 16 kV per the Human Body Model (HBM), verified per JEDEC JS-001. This intrinsic robustness allows direct use in unprotected I/O paths-such as RS-485 or CAN transceiver lines-without requiring additional discrete ESD suppressors in many designs.
What does the "TR7" suffix indicate in 1PMT5945C/TR7?
The "TR7" suffix specifies EIA-481-compliant tape-and-reel packaging on a 7-inch reel containing 3,000 units. This format ensures compatibility with standard SMT pick-and-place equipment and supports high-volume automated assembly without manual handling or repackaging.
Can 1PMT5945C/TR7 replace older through-hole Zener diodes in existing designs?
Yes, the 1PMT5945C/TR7 can replace through-hole Zeners (e.g., 1N5255B) in many cases-but requires layout adaptation: its DO-216 footprint differs mechanically, and thermal design must shift from ambient convection to tab-conducted cooling. Electrical behavior is functionally equivalent, but PCB thermal pad design is essential to achieve rated 3.0 W performance.
1PMT5945C/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:
- ±2%
- 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
1PMT5945C/TR7 FAQ
1.How can I place an order for 1PMT5945C/TR7 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1PMT5945C/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 1PMT5945C/TR7 reliable?
The price and inventory of 1PMT5945C/TR7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1PMT5945C/TR7 is usually 5 days.
3.What payment methods are accepted for 1PMT5945C/TR7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1PMT5945C/TR7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1PMT5945C/TR7?
1PMT5945C/TR7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1PMT5945C/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 1PMT5945C/TR7?
For technical support, including 1PMT5945C/TR7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1PMT5945C/TR7 requirements.
6.How does Aetrix verify that 1PMT5945C/TR7 is sourced from the original manufacturer or authorized distributors?
All 1PMT5945C/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 1PMT5945C/TR7 meets industry standards.
7.What is the process for return or replacement of 1PMT5945C/TR7?
All 1PMT5945C/TR7 units undergo pre-shipment inspection (PSI). If there is an issue with 1PMT5945C/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 1PMT5945C/TR7 part is unused and in its original packaging.
Return procedure for 1PMT5945C/TR7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1PMT5945C/TR7 Tags
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MM5Z5V1ST1G
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