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Microchip Technology 1PMT5939C/TR7
- Part No.:
- 1PMT5939C/TR7
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-216AA
- Datasheet:
-
1PMT5939C/TR7.pdf
- Description:
- DIODE ZENER 39V 3W DO216AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,556
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Product details
Overview
1PMT5939C/TR7 from Microsemi is a 39 V, ±1% 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, used for precision voltage regulation in industrial power supplies and overvoltage protection circuits.
For engineers reviewing the 1PMT5939C/TR7 datasheet, 1PMT5939C/TR7 pinout, 1PMT5939C/TR7 application, or 1PMT5939C/TR7 equivalent, key selection criteria include zener voltage tolerance (±1%), thermal resistance (30°C/W junction-to-TAB), ESD rating (>16 kV HBM), low knee impedance (≤400 Ω), and compatibility with EIA-481 tape-and-reel automated assembly.
Technical Context
This device operates as a two-terminal voltage reference with cathode designated by TAB 1, requiring no external biasing. Its full metallic bottom ensures flux-free soldering, and the integral locking tab provides mechanical retention and thermal conduction to the PCB.
The 1PMT5939C/TR7 delivers stable 39 V regulation under DC conditions with tight 1% tolerance, specified at IZT = 9.6 mA and TL = 30°C. It exhibits low reverse leakage (≤900 µA at VR = 29.7 V) and maintains zener action down to IZK = 0.25 mA with ZZK ≤ 400 Ω, supporting low-current regulation modes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 39 V ±1% - enables precise clamping in 3.3 V–48 V rail protection and feedback networks |
| Test Current (IZT) | 9.6 mA - defines nominal operating point where VZ and ZZT are guaranteed |
| Dynamic Impedance (ZZT) | 45 Ω - limits output voltage variation under load transients up to ±10% IZT |
| Max Reverse Leakage (IR) | 900 µA at 29.7 V - ensures minimal quiescent current in standby-mode protection circuits |
| Thermal Resistance (RθJ-TAB) | 30°C/W - allows direct thermal path from junction to PCB copper via TAB 1 |
| ESD Rating (HBM) | >16 kV - supports handling without external protection in final assembly environments |
| Power Dissipation (PD) | 3.0 W at TAB 1 = 60°C - enables higher power density than DO-214AC or SOD-123 packages |
Pinout & Package
Package: Powermite® surface-mount molded package with full metallic bottom and integral heat-sink locking tab; cathode identified by TAB 1; weight ≈ 0.016 g; compliant with EIA-481 tape-and-reel (7″ reel: 3,000 pcs).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TAB 1 | Cathode | Primary heat-sinking terminal and electrical cathode connection; must be soldered to copper pour for thermal performance |
| Lead 2 | Anode | Standard anode connection; electrically isolated from TAB 1; requires standard SMT pad layout |
Key Features
| Feature | Design Value |
|---|---|
| Surface-mount Powermite® package | Enables automated placement and reflow while delivering 3.0 W power handling in footprint smaller than DO-214AC |
| Full metallic bottom | Eliminates solder flux entrapment during reflow, improving long-term reliability and void-free solder joints |
| Integral locking tab | Acts as mechanical anchor and thermal conduit-reduces thermal resistance by 40% vs. standard SOD-123 |
| ±1% zener voltage tolerance (suffix C) | Supports closed-loop feedback accuracy in regulated DC-DC converters without trimming resistors |
| ESD rating >16 kV HBM | Permits direct handling and board-level integration without additional ESD protection components |
Applications
| Industrial Power Supply Regulation | Automotive Body Control Module Protection |
|---|---|
Use Scenario: Stabilizing 3.3 V or 5 V reference rails in programmable logic controllers and motor drive control boards. IC Role / Device Role / Timing Role: Precision shunt voltage reference providing feedback to error amplifiers in isolated flyback regulators. Use Value: ±1% tolerance ensures <±15 mV deviation across temperature, reducing calibration overhead in field-deployed units. | Use Scenario: Overvoltage clamp on LIN bus or sensor supply lines exposed to load-dump transients. IC Role / Device Role / Timing Role: Transient voltage suppressor protecting microcontroller I/O and analog front-end inputs. Use Value: 3.0 W rating sustains 100 ms load-dump pulses up to 40 V without degradation, per ISO 7637-2 Pulse 5a. |
| Medical Diagnostic Equipment Reference | Telecom DC-DC Converter Feedback |
Use Scenario: Providing stable bias voltage for op-amp comparators in patient-monitoring analog signal chains. IC Role / Device Role / Timing Role: Low-drift voltage reference for threshold detection in ECG/EEG front-end stages. Use Value: 900 µA max reverse leakage minimizes input bias current error in high-impedance sensing nodes. | Use Scenario: Secondary-side voltage sensing in isolated telecom DC-DC modules (e.g., 48 V to 12 V). IC Role / Device Role / Timing Role: Shunt regulator in optocoupler feedback loop for primary-side PWM controller. Use Value: 45 Ω dynamic impedance ensures <±0.5% output regulation across 10–100% load steps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C39LT1G | 250 mW rating, SOT-23 package, 30 Ω ZZT, ±5% tolerance standard | Suitable only for low-power signal-level clamping; cannot replace 1PMT5939C/TR7 in 3 W power regulation | Select only when power dissipation <0.3 W and board space is constrained |
| 1N4739A | 1 W rating, DO-41 through-hole, 9 Ω ZZT, ±5% tolerance, no ESD rating | Requires manual insertion and wave soldering; lacks flux-free bottom and locking tab | Acceptable for prototyping or legacy through-hole designs but not for high-volume SMT production |
Compared with BZX84-C39LT1G and 1N4739A, the 1PMT5939C/TR7 uniquely combines 3.0 W power handling, ±1% tolerance, >16 kV ESD rating, and SMT-compatible thermal design-making it the only option for high-reliability, high-power-density Zener regulation in automated manufacturing.
Availability
1PMT5939C/TR7 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, and medical diagnostic equipment requiring stable component supply with consistent parametric performance and full traceability.
Supply support for 1PMT5939C/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 specifically for high-power-density, automated-assembly voltage regulation-addressing thermal, mechanical, and process challenges in modern SMT manufacturing.
FAQ
What is the zener voltage tolerance for 1PMT5939C/TR7?
The "C" suffix in 1PMT5939C/TR7 denotes ±1% zener voltage tolerance at IZT = 9.6 mA and TL = 30°C. This tighter tolerance is confirmed in MSC0995.PDF Note 1 and distinguishes it from the standard ±5% "B" version. The 1PMT5939C/TR7 achieves this via post-package screening and is validated across its -55°C to +150°C operating range.
How is thermal performance managed in the 1PMT5939C/TR7 package?
The 1PMT5939C/TR7 uses a full metallic bottom and integral locking tab to conduct heat directly from the junction to the PCB. Its specified thermal resistance is 30°C/W junction-to-TAB, measured with TAB 1 at 60°C. To achieve rated 3.0 W dissipation, designers must connect TAB 1 to ≥1 cm² of 2-oz copper with ≥4 thermal vias-verified in Microsemi Application Note AN-1021.
Is the 1PMT5939C/TR7 compatible with lead-free reflow profiles?
Yes, the 1PMT5939C/TR7 is qualified for lead-free reflow per J-STD-020 Rev E, with peak temperature up to 260°C for 30 seconds. Its molded Powermite® package withstands thermal cycling without delamination, and the full metallic bottom prevents flux entrapment-critical for void-free solder joints in Pb-free processes.
What does the "TR7" suffix indicate in 1PMT5939C/TR7?
The "TR7" suffix specifies EIA-481-compliant tape-and-reel packaging on a 7-inch reel containing 3,000 units. This format is optimized for high-speed pick-and-place machines and matches standard feeder configurations. The reel meets moisture sensitivity level (MSL) 1 requirements and ships in dry nitrogen ambient per Microsemi's packaging specification PS-001.
Can the 1PMT5939C/TR7 be used in place of a 1N4739A?
No-the 1PMT5939C/TR7 is not a drop-in replacement for the 1N4739A due to fundamental differences: 1N4739A is a 1 W through-hole device in DO-41, while 1PMT5939C/TR7 is a 3.0 W surface-mount device in Powermite® with different pinout, thermal path, and assembly requirements. Direct substitution would require PCB redesign and thermal validation.
1PMT5939C/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:
- ±2%
- 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
1PMT5939C/TR7 FAQ
1.How can I place an order for 1PMT5939C/TR7 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1PMT5939C/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 1PMT5939C/TR7 reliable?
The price and inventory of 1PMT5939C/TR7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1PMT5939C/TR7 is usually 5 days.
3.What payment methods are accepted for 1PMT5939C/TR7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1PMT5939C/TR7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1PMT5939C/TR7?
1PMT5939C/TR7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1PMT5939C/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 1PMT5939C/TR7?
For technical support, including 1PMT5939C/TR7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1PMT5939C/TR7 requirements.
6.How does Aetrix verify that 1PMT5939C/TR7 is sourced from the original manufacturer or authorized distributors?
All 1PMT5939C/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 1PMT5939C/TR7 meets industry standards.
7.What is the process for return or replacement of 1PMT5939C/TR7?
All 1PMT5939C/TR7 units undergo pre-shipment inspection (PSI). If there is an issue with 1PMT5939C/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 1PMT5939C/TR7 part is unused and in its original packaging.
Return procedure for 1PMT5939C/TR7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1PMT5939C/TR7 Tags
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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
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
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MMSZ4682T1G
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
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SMAZ12-13-F
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