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Microchip Technology 1PMT5945A/TR13
- Part No.:
- 1PMT5945A/TR13
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-216AA
- Datasheet:
-
1PMT5945A/TR13.pdf
- Description:
- DIODE ZENER 68V 3W DO216AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,681
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Product details
Overview
1PMT5945A/TR13 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 DC power rails of industrial control modules.
For engineers reviewing the 1PMT5945A/TR13 datasheet, 1PMT5945A/TR13 pinout, 1PMT5945A/TR13 application, or 1PMT5945A/TR13 equivalent, key selection criteria include Zener voltage accuracy, thermal resistance (30°C/W junction-to-TAB), ESD rating (>16 kV HBM), low knee impedance, and compatibility with automated SMT placement equipment.
Technical Context
This device operates as a two-terminal voltage-regulating diode with sharp Zener breakdown at 68 V nominal. Its Powermite® package integrates a full metallic bottom and locking tab to enhance thermal conduction and mechanical stability during reflow soldering.
Electrical behavior is defined at TL = 30°C with IZT = 5.5 mA; voltage regulation remains stable across -55°C to +150°C junction temperature range, supported by low reverse leakage (≤1700 µA at VR = 51.2 V) and tight dynamic impedance control (120 Ω).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage | 68 V ±5% - precise clamping threshold for 51–52 V rail protection |
| Power Dissipation | 3.0 W at TAB 1 = 60°C - enables high-energy transient suppression without heatsink |
| Test Current | 5.5 mA - standard bias point for stable VZ measurement and regulation |
| Dynamic Impedance | 120 Ω at IZT - ensures minimal voltage shift under load current variation |
| Reverse Leakage | ≤1700 µA at 51.2 V - guarantees low standby power loss in always-on circuits |
| Thermal Resistance | 30°C/W junction-to-TAB - allows direct thermal coupling to PCB copper pour or metal frame |
| ESD Rating | >16 kV HBM - provides robust handling immunity during board assembly and field operation |
Pinout & Package
Package: Powermite® surface-mount molded case with full metallic bottom and integral heat-sink locking tab; cathode designated by TAB 1; weight ≈ 0.016 g; DO-216 outline per mechanical drawing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TAB 1 | Cathode | Primary heat path and voltage reference node; must be connected to ground or low-impedance return plane |
| Lead 2 | Anode | Current entry point during reverse-bias operation; routed to protected circuit node |
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 |
| Integral heat-sink locking tab | Improves thermal transfer efficiency and prevents component rotation during solder paste reflow |
| Full metallic bottom | Eliminates solder flux entrapment risk and enhances thermal conduction to PCB ground plane |
| ESD rating >16 kV HBM | Reduces need for external ESD protection in front-end power interfaces |
| Low knee impedance (0.25 Ω at IZK) | Ensures stable regulation even at very low bias currents near breakdown threshold |
Applications
| Industrial Power Supply Monitoring | Automotive Body Control Module |
|---|---|
Use Scenario: Monitoring 48 V battery-derived DC bus for undervoltage/overvoltage faults in programmable logic controllers. IC Role / Device Role / Timing Role: Zener clamping element providing reference input to comparator or ADC monitoring circuit. Use Value: 68 V breakdown ensures reliable detection of >10% overvoltage events while maintaining <1.7 mA standby leakage. | Use Scenario: Protecting microcontroller I/O pins from load-dump transients on 12 V CAN subsystem rails. IC Role / Device Role / Timing Role: Transient voltage suppressor placed between supply rail and ground, triggered above 51.2 V. Use Value: 3.0 W rating absorbs ISO 7637-2 Pulse 5a energy without degradation; 30°C/W thermal resistance enables direct PCB copper sinking. |
| Telecom DC-DC Converter Feedback | Medical Infusion Pump Power Stage |
Use Scenario: Providing stable voltage reference for optocoupler feedback loop in isolated 24 V output DC-DC converters. IC Role / Device Role / Timing Role: Precision Zener reference replacing TL431 where higher power margin and lower tempco are required. Use Value: ±5% tolerance and 120 Ω dynamic impedance ensure <±0.5% output regulation drift across line/load/temperature. | Use Scenario: Clamping gate drive voltage of motor driver MOSFETs against overshoot during fast switching transitions. IC Role / Device Role / Timing Role: Fast-response Zener clamp limiting VGS to safe level during PWM edge transitions. Use Value: 1700 µA max IR at 51.2 V minimizes quiescent current draw in battery-powered safety-critical systems. |
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 Zener voltage, but in DO-41 through-hole package; 1.5 W rating; no metallic bottom or locking tab | Suitable only for prototyping or low-volume manual assembly; lacks thermal performance for high-reliability SMT designs | Select 1PMT5945A/TR13 when automated production, thermal management, or space constraints require surface-mount solution |
| BZX84-C68 | 68 V Zener in SOT-23; 300 mW power rating; 100 Ω typical Zzt; 100 nA IR at 54.4 V | Designed for low-power signal-level clamping; insufficient for 3 W surge absorption or rail stabilization | Choose 1PMT5945A/TR13 for primary power rail protection; use BZX84-C68 only for secondary signal conditioning stages |
Compared with 1N5945B and BZX84-C68, the 1PMT5945A/TR13 uniquely combines 3.0 W power handling, SMT compatibility, and 30°C/W thermal resistance-enabling direct integration into high-density, thermally constrained industrial PCBs without derating or auxiliary cooling.
Availability
1PMT5945A/TR13 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, telecom DC-DC converters, and medical infusion pump designs requiring stable component supply and long-term manufacturability.
Supply support for 1PMT5945A/TR13 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 and mixed-signal components for aerospace, defense, and industrial markets.
The Powermite® Zener series-including 1PMT5945A/TR13-was engineered for ruggedized surface-mount voltage regulation in harsh-environment power systems where thermal performance and assembly reliability are critical.
FAQ
What is the Zener voltage tolerance for 1PMT5945A/TR13?
The 1PMT5945A/TR13 has a standard Zener voltage tolerance of ±5% at 68 V nominal, measured at 5.5 mA test current and TAB 1 temperature of 30°C. Tighter tolerances (±2%, ±1%) are available with suffixes C and D, respectively, but are not applicable to the /TR13 variant.
Can 1PMT5945A/TR13 be used in place of through-hole Zeners like 1N5945B?
No direct substitution is recommended. While both share 68 V nominal Zener voltage, the 1PMT5945A/TR13 delivers 3.0 W power dissipation in a surface-mount Powermite® package with 30°C/W thermal resistance, whereas the 1N5945B is rated for 1.5 W in DO-41. Layout, thermal design, and assembly process differ significantly.
What is the maximum reverse leakage current for 1PMT5945A/TR13?
The maximum reverse leakage current for 1PMT5945A/TR13 is 1700 µA at a reverse voltage of 51.2 V, specified at TL = 30°C. This value ensures minimal standby power loss in always-on monitoring circuits while maintaining reliable clamping action.
How does the Powermite® package improve thermal performance of 1PMT5945A/TR13?
The Powermite® package of 1PMT5945A/TR13 features a full metallic bottom and integral locking tab that directly conduct heat from the junction to TAB 1, achieving 30°C/W junction-to-TAB thermal resistance. This allows efficient heat transfer to PCB copper pours without requiring external heatsinks.
Is 1PMT5945A/TR13 compatible with standard SMT reflow profiles?
Yes, 1PMT5945A/TR13 is qualified for standard lead-free reflow soldering per J-STD-020. Its molded Powermite® package withstands peak temperatures up to 260°C, and the locking tab design prevents rotation or tombstoning during reflow-ensuring high first-pass yield in automated assembly lines.
1PMT5945A/TR13 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
1PMT5945A/TR13 FAQ
1.How can I place an order for 1PMT5945A/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1PMT5945A/TR13 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 1PMT5945A/TR13 reliable?
The price and inventory of 1PMT5945A/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1PMT5945A/TR13 is usually 5 days.
3.What payment methods are accepted for 1PMT5945A/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1PMT5945A/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1PMT5945A/TR13?
1PMT5945A/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1PMT5945A/TR13 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 1PMT5945A/TR13?
For technical support, including 1PMT5945A/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1PMT5945A/TR13 requirements.
6.How does Aetrix verify that 1PMT5945A/TR13 is sourced from the original manufacturer or authorized distributors?
All 1PMT5945A/TR13 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 1PMT5945A/TR13 meets industry standards.
7.What is the process for return or replacement of 1PMT5945A/TR13?
All 1PMT5945A/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with 1PMT5945A/TR13, 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 1PMT5945A/TR13 part is unused and in its original packaging.
Return procedure for 1PMT5945A/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1PMT5945A/TR13 Tags
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MMBZ5240B-7-F
Diodes Incorporated
-
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
onsemi
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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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