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Microchip Technology 1PMT5939E3/TR7
- Part No.:
- 1PMT5939E3/TR7
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-216AA
- Datasheet:
-
1PMT5939E3/TR7.pdf
- Description:
- DIODE ZENER 39V 3W DO216AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,515
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Product details
Overview
1PMT5939E3/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 1.0 V reverse voltage. It serves as a precision voltage reference or overvoltage clamp in power supply regulation and protection circuits.
For engineers reviewing the 1PMT5939E3/TR7 datasheet, 1PMT5939E3/TR7 pinout, 1PMT5939E3/TR7 application, or 1PMT5939E3/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 using EIA-481 tape-and-reel packaging.
Technical Context
This Zener diode operates in reverse breakdown mode with tightly controlled voltage regulation across its specified test current range (IZT = 9.6 mA). 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 (≤900 µA at VR = 1.0 V) and a well-defined knee region (IZK = 0.25 mA, ZZK = 900 Ω), enabling stable clamping performance even at low bias currents. Junction temperature range is –55°C to +150°C, supporting industrial and automotive under-hood applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 39 V ±5% at IZT = 9.6 mA - defines nominal regulation point with production-grade tolerance |
| Power Dissipation | 3.0 W at TAB 1 = 60°C - sets maximum continuous thermal load under defined heatsinking condition |
| Dynamic Impedance (ZZT) | 45 Ω at IZT = 9.6 mA - determines small-signal voltage variation under load current changes |
| Knee Impedance (ZZK) | 900 Ω at IZK = 0.25 mA - indicates regulation quality near turn-on threshold |
| Reverse Leakage (IR) | ≤900 µA at VR = 1.0 V - ensures minimal standby power loss in high-impedance bias networks |
| Thermal Resistance | 30°C/W junction-to-TAB1 - quantifies thermal path efficiency for PCB copper pad heatsinking |
| ESD Rating | >16 kV per Human Body Model - supports robust handling and board-level ESD immunity |
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 heat-sinking terminal and electrical cathode connection; must be soldered to copper pour for thermal management |
| Lead 2 | Anode | Standard anode terminal; electrically isolated from TAB 1; used for circuit connection and current sourcing |
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 path from junction to PCB copper, reducing thermal resistance by ~30% vs. standard SOD packages |
| EIA-481 tape-and-reel packaging | Enables seamless integration into high-speed pick-and-place equipment without manual handling or orientation errors |
| –55°C to +150°C operating range | Supports deployment in extended-temperature environments including automotive engine control units and industrial motor drives |
Applications
| Power Supply Voltage Reference | Overvoltage Clamp in DC-DC Converters |
|---|---|
Use Scenario: Stabilizing feedback node in isolated flyback or forward converter secondary-side regulation. IC Role / Device Role / Timing Role: Zener diode provides precise 39 V reference for optocoupler biasing and error amplifier threshold setting. Use Value: Tight 5% VZ tolerance and low ZZT ensure <±1.5% output voltage drift across line/load/temperature variations. | Use Scenario: Protecting gate drivers or controller ICs from transient voltage spikes on 24 V or 48 V bus rails. IC Role / Device Role / Timing Role: Clamps surge events above 39 V to safe levels before they reach sensitive downstream components. Use Value: 3.0 W power rating and 30°C/W thermal resistance allow sustained clamping of 100 ms transients without thermal runaway. |
| ESD Protection for Sensor Interfaces | Programmable Threshold Detector |
Use Scenario: Safeguarding analog inputs of temperature or pressure sensors connected to microcontrollers in harsh industrial settings. IC Role / Device Role / Timing Role: Acts as bidirectional ESD shunt between signal line and ground, leveraging >16 kV HBM rating. Use Value: Low IR (≤900 µA) prevents DC loading of high-impedance sensor outputs while maintaining fast transient response. | Use Scenario: Setting trip point for comparator-based battery undervoltage lockout or brownout detection. IC Role / Device Role / Timing Role: Provides stable 39 V threshold reference for LM393 or similar open-collector comparators. Use Value: Well-defined knee region (IZK = 0.25 mA) enables reliable triggering even with weak pull-up sources. |
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 |
|---|---|---|---|
| 1N5359B | Same 39 V nominal VZ, but DO-204AL (DO-41) through-hole package; 5 W rating; higher thermal resistance (~65°C/W) | Requires through-hole assembly and larger PCB footprint; unsuitable for high-density SMT designs | Select when legacy through-hole manufacturing or higher single-pulse surge capability is required |
| BZX84-C39 | SOT-23 package; 39 V ±5%; 300 mW rating; 90 Ω ZZT; no metallic thermal tab | Limited to low-power signal-level clamping; cannot sustain 3.0 W continuous dissipation | Select only for space-constrained, low-power bias/reference use - not for power rail protection |
Compared with 1N5359B and BZX84-C39, the 1PMT5939E3/TR7 uniquely combines SMT compatibility, 3.0 W power handling, and low thermal resistance via its Powermite® metallic tab-making it the only option suitable for high-reliability, thermally demanding SMT voltage regulation where both size and thermal performance are critical.
Availability
1PMT5939E3/TR7 is available at Aetrix Electronics and suitable for power supply regulation, overvoltage protection, ESD safeguarding, and precision voltage reference applications requiring stable component supply across industrial, automotive, and embedded systems.
Supply support for 1PMT5939E3/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 to deliver high-power surface-mount voltage regulation in compact form factors-specifically addressing thermal and assembly challenges in automated, high-volume power electronics manufacturing.
FAQ
What is the zener voltage tolerance of the 1PMT5939E3/TR7?
The 1PMT5939E3/TR7 has a standard zener voltage tolerance of ±5% at 39 V, measured at IZT = 9.6 mA with TAB 1 held at 30°C. Tighter tolerances (±2%, ±1%) are available with suffixes C and D respectively, but the E3/TR7 variant specifies ±5%. This tolerance directly impacts regulation accuracy in feedback loops and reference circuits using the 1PMT5939E3/TR7.
How is thermal management implemented for the 1PMT5939E3/TR7?
The 1PMT5939E3/TR7 uses its metallic TAB 1 as the primary thermal path, with a specified junction-to-TAB thermal resistance of 30°C/W. Effective thermal management requires soldering TAB 1 to a minimum 10 mm² copper pour on the PCB. This design enables the 1PMT5939E3/TR7 to safely dissipate its full 3.0 W rating when the tab temperature is maintained at ≤60°C.
Is the 1PMT5939E3/TR7 compatible with lead-free reflow processes?
Yes, the 1PMT5939E3/TR7 is qualified for lead-free reflow soldering per J-STD-020. Its Powermite® package withstands peak temperatures up to 260°C for 10 seconds. The full metallic bottom and molded construction prevent delamination or flux entrapment, ensuring reliable joint formation in modern RoHS-compliant manufacturing lines using the 1PMT5939E3/TR7.
What does the "TR7" suffix indicate in 1PMT5939E3/TR7?
The "TR7" suffix denotes EIA-481 compliant 7-inch tape-and-reel packaging containing 3,000 units. This format is optimized for high-speed SMT placement equipment. The "E3" portion indicates compliance with JEDEC Level 3 moisture sensitivity, requiring bake-out only if exposed to ambient conditions beyond 168 hours - a key handling detail for production planning with the 1PMT5939E3/TR7.
Can the 1PMT5939E3/TR7 be used in bidirectional ESD protection configurations?
No - the 1PMT5939E3/TR7 is a unidirectional Zener diode with cathode marked on TAB 1. For bidirectional ESD protection, two 1PMT5939E3/TR7 devices must be connected anode-to-anode. While this configuration leverages the device's >16 kV HBM rating, discrete back-to-back placement is less space-efficient than purpose-built TVS arrays; however, it remains a validated approach for custom high-voltage ESD solutions using the 1PMT5939E3/TR7.
1PMT5939E3/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:
- ±20%
- 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
1PMT5939E3/TR7 FAQ
1.How can I place an order for 1PMT5939E3/TR7 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1PMT5939E3/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 1PMT5939E3/TR7 reliable?
The price and inventory of 1PMT5939E3/TR7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1PMT5939E3/TR7 is usually 5 days.
3.What payment methods are accepted for 1PMT5939E3/TR7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1PMT5939E3/TR7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1PMT5939E3/TR7?
1PMT5939E3/TR7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1PMT5939E3/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 1PMT5939E3/TR7?
For technical support, including 1PMT5939E3/TR7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1PMT5939E3/TR7 requirements.
6.How does Aetrix verify that 1PMT5939E3/TR7 is sourced from the original manufacturer or authorized distributors?
All 1PMT5939E3/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 1PMT5939E3/TR7 meets industry standards.
7.What is the process for return or replacement of 1PMT5939E3/TR7?
All 1PMT5939E3/TR7 units undergo pre-shipment inspection (PSI). If there is an issue with 1PMT5939E3/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 1PMT5939E3/TR7 part is unused and in its original packaging.
Return procedure for 1PMT5939E3/TR7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1PMT5939E3/TR7 Tags
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MMBZ5240B-7-F
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