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Microchip Technology 1PMT5939A/TR7
- Part No.:
- 1PMT5939A/TR7
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-216AA
- Datasheet:
-
1PMT5939A/TR7.pdf
- Description:
- DIODE ZENER 39V 3W DO216AA
- Quantity:
- Payment:
- Shipping:
Inventory:4,400
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Product details
Overview
1PMT5939A/TR7 from Microsemi is a 39 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 45 Ω dynamic impedance at 9.6 mA test current and 900 µA max reverse leakage at 29.7 V. It serves as a precision voltage reference or overvoltage clamp in DC power rails and regulator feedback paths.
For engineers reviewing the 1PMT5939A/TR7 datasheet, 1PMT5939A/TR7 pinout, 1PMT5939A/TR7 application, or 1PMT5939A/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 (0.25 Ω), and compatibility with EIA-481 tape-and-reel automated assembly.
Technical Context
This device operates as a two-terminal voltage-regulating diode with sharp breakdown characteristics, optimized for stable DC reference generation under varying load and temperature conditions. Its Powermite® package integrates a full metallic bottom and locking tab to enhance thermal conduction and mechanical retention during reflow.
The 1PMT5939A/TR7 exhibits a nominal zener voltage of 39 V measured at 9.6 mA (IZT), with 45 Ω dynamic impedance (ZZT) and 0.25 Ω knee impedance (ZZK) at 0.25 mA (IZK), enabling low-noise regulation in low-current bias networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage | 39 V ±5% at IZT = 9.6 mA - defines stable regulation point for feedback or clamping |
| Power Dissipation | 3.0 W at TAB 1 = 60°C - supports high-energy transient suppression without derating |
| Dynamic Impedance | 45 Ω at IZT - ensures minimal output voltage variation under load current changes |
| Knee Impedance | 0.25 Ω at IZK = 0.25 mA - enables stable regulation even near breakdown threshold |
| Reverse Leakage | ≤900 µA at VR = 29.7 V - guarantees low standby power loss in high-impedance bias networks |
| Thermal Resistance | 30°C/W junction-to-TAB - allows direct thermal path to PCB copper for passive cooling |
| ESD Rating | >16 kV per HBM - protects against handling-induced damage in automated SMT lines |
Pinout & Package
Package: Powermite® surface-mount molded package with full metallic bottom and integral heat-sink locking tab; cathode designated by TAB 1; weight ≈ 0.016 g; mounting position unrestricted.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TAB 1 | Cathode | Primary heat-sinking terminal and voltage reference node; must be connected to ground or low-impedance return path |
| Lead 2 | Anode | Current entry point during reverse-bias operation; connects to unregulated input or signal line |
Key Features
| Feature | Design Value |
|---|---|
| Surface-mount Powermite® package | Enables automated placement and reflow while delivering 3.0 W power handling in compact footprint |
| 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 anchoring and direct thermal conduction path to PCB copper pour |
| ESD robustness >16 kV HBM | Reduces risk of field failure due to electrostatic discharge during board handling and testing |
Applications
| DC Power Supply Regulation | Overvoltage Protection Circuit |
|---|---|
Use Scenario: Stabilizing feedback voltage in isolated flyback or buck converter secondary-side regulation. IC Role / Device Role / Timing Role: Precision voltage reference for optocoupler-based error amplification loop. Use Value: Tight 39 V ±5% tolerance and low 45 Ω dynamic impedance maintain regulation accuracy across line/load transients. | Use Scenario: Clamping surge-induced voltage spikes on industrial sensor I/O lines. IC Role / Device Role / Timing Role: Bidirectional transient voltage suppressor protecting downstream analog front-end circuitry. Use Value: 3.0 W power rating and 30°C/W thermal resistance enable sustained energy absorption without thermal runaway. |
| Low-Power Reference Source | Automated Test Equipment Biasing |
Use Scenario: Generating stable bias voltage for op-amp input stages in battery-powered instrumentation. IC Role / Device Role / Timing Role: Low-current zener reference operating at 0.25 mA knee current. Use Value: 0.25 Ω knee impedance ensures regulation stability even below 1 mA, minimizing quiescent current impact. | Use Scenario: Providing calibrated reference voltage for DAC output calibration in ATE rack controllers. IC Role / Device Role / Timing Role: High-ESD-tolerance voltage standard for production test fixture interfaces. Use Value: >16 kV HBM rating prevents ESD-induced parameter shift during repeated probe contact cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5939B | Same 39 V zener voltage but in DO-41 through-hole package; no metallic bottom or locking tab; 50°C/W thermal resistance | Requires manual or wave soldering; unsuitable for high-density SMT layouts or thermally constrained designs | Select only when legacy through-hole assembly or higher thermal margin is acceptable |
| BZX84-C39 | SOT-23 package; 39 V ±5%; 300 mW power rating; 90 Ω dynamic impedance; 150°C max junction temp | Limited to low-power biasing; cannot replace 1PMT5939A/TR7 in 3 W clamping or regulation roles | Use only in space-constrained, sub-100 mA applications where thermal performance is secondary |
Compared with 1N5939B and BZX84-C39, the 1PMT5939A/TR7 uniquely combines 3.0 W power handling, 30°C/W thermal resistance, and SMT compatibility-making it irreplaceable in high-reliability, thermally demanding surface-mount voltage reference designs.
Availability
1PMT5939A/TR7 is available at Aetrix Electronics and suitable for DC power supply regulation, overvoltage protection circuits, and low-power reference source applications requiring stable component supply across automotive, industrial control, and test equipment programs.
Supply support for 1PMT5939A/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 designed to deliver high-power surface-mount voltage regulation in space-constrained, thermally demanding environments-bridging the performance gap between traditional through-hole Zeners and low-power SMT alternatives.
FAQ
What is the zener voltage tolerance of the 1PMT5939A/TR7?
The 1PMT5939A/TR7 has a standard zener voltage tolerance of ±5% at 39 V, measured at 9.6 mA test current and TAB 1 temperature of 30°C. Tighter tolerances (±2%, ±1%) are available with suffixes C and D, respectively, but the 1PMT5939A/TR7 specifically uses the standard ±5% grade.
How is thermal management handled in the 1PMT5939A/TR7 package?
The 1PMT5939A/TR7 uses the Powermite® package with a full metallic bottom and integral locking tab that acts as a heat sink. Its junction-to-TAB thermal resistance is 30°C/W, enabling efficient conduction of heat directly into the PCB copper, which is critical for sustaining its 3.0 W power dissipation rating.
Is the 1PMT5939A/TR7 compatible with automated SMT assembly processes?
Yes, the 1PMT5939A/TR7 is fully compatible with automated insertion and reflow soldering. It ships in EIA-481 tape-and-reel format (7-inch reel, 3,000 pieces), and its Powermite® design includes features like a locking tab and flux-free metallic bottom to ensure reliable placement and solder joint integrity.
What is the maximum reverse leakage current for the 1PMT5939A/TR7?
The 1PMT5939A/TR7 specifies a maximum reverse leakage current of 900 µA at a reverse voltage of 29.7 V (75% of nominal zener voltage). This low leakage supports stable operation in high-impedance bias networks and precision reference applications.
Does the 1PMT5939A/TR7 have ESD protection built-in?
Yes, the 1PMT5939A/TR7 is rated for >16 kV electrostatic discharge per the Human Body Model (HBM), making it robust against ESD events during handling, automated placement, and board-level testing-critical for high-yield manufacturing of industrial and test equipment.
1PMT5939A/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):
- 39 V
- Tolerance:
- ±10%
- Power - Max:
- 3 W
- Impedance (Max) (Zzt):
- 45 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 29.7 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
1PMT5939A/TR7 FAQ
1.How can I place an order for 1PMT5939A/TR7 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1PMT5939A/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 1PMT5939A/TR7 reliable?
The price and inventory of 1PMT5939A/TR7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1PMT5939A/TR7 is usually 5 days.
3.What payment methods are accepted for 1PMT5939A/TR7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1PMT5939A/TR7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1PMT5939A/TR7?
1PMT5939A/TR7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1PMT5939A/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 1PMT5939A/TR7?
For technical support, including 1PMT5939A/TR7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1PMT5939A/TR7 requirements.
6.How does Aetrix verify that 1PMT5939A/TR7 is sourced from the original manufacturer or authorized distributors?
All 1PMT5939A/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 1PMT5939A/TR7 meets industry standards.
7.What is the process for return or replacement of 1PMT5939A/TR7?
All 1PMT5939A/TR7 units undergo pre-shipment inspection (PSI). If there is an issue with 1PMT5939A/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 1PMT5939A/TR7 part is unused and in its original packaging.
Return procedure for 1PMT5939A/TR7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1PMT5939A/TR7 Tags
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BZT52C5V6T-7
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MMSZ5231B-7-F
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BZX84C3V3LT1G
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MM5Z5V1ST1G
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