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Microchip Technology 1PMT5939/TR7
- Part No.:
- 1PMT5939/TR7
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-216AA
- Datasheet:
-
1PMT5939/TR7.pdf
- Description:
- DIODE ZENER 39V 3W DO216AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,820
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Product details
Overview
1PMT5939B 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. It serves as a precision voltage reference or overvoltage clamp in DC power regulation circuits.
For engineers reviewing the 1PMT5939B datasheet, 1PMT5939B pinout, 1PMT5939B application, or 1PMT5939B equivalent, key selection criteria include zener voltage accuracy, thermal resistance (30°C/W junction-to-TAB), ESD rating (>16 kV HBM), low knee impedance (0.25 Ω), and compatibility with automated SMT assembly.
Technical Context
This Zener diode operates in reverse breakdown mode with tightly controlled voltage regulation across its specified test current range. 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), a sharp knee characteristic (IZK = 0.25 mA, ZZK = 900 Ω), and stable performance over -55°C to +150°C junction temperature range - enabling reliable use in industrial and automotive power-supply monitoring applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 39 V ±5% at IZT = 9.6 mA - defines nominal regulation point under standard test conditions |
| Power Dissipation | 3.0 W at TAB 1 = 60°C - maximum continuous DC power handling with defined thermal mounting condition |
| Dynamic Impedance (ZZT) | 45 Ω at IZT = 9.6 mA - indicates small-signal AC resistance affecting regulation stability under varying load |
| Reverse Leakage (IR) | ≤900 µA at VR = 1.0 V - ensures minimal standby current in clamping or reference configurations |
| Thermal Resistance | 30°C/W junction-to-TAB1 - quantifies thermal path efficiency for heatsinking via the metal tab |
| ESD Rating | >16 kV per Human Body Model - supports robust handling and operation in electrostatic-prone environments |
| Knee Current (IZK) | 0.25 mA - minimum current required to enter useful regulation region with low ZZK |
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; DO-216 outline.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TAB 1 | Cathode | Primary heat-sinking terminal and electrical cathode connection; must be thermally anchored for rated power dissipation |
| Lead 2 | Anode | Standard anode connection; mounted opposite TAB 1; no thermal function |
Key Features
| Feature | Design Value |
|---|---|
| Surface-mount Powermite® package | Enables high-density PCB layout while delivering 3.0 W power handling traditionally found in larger through-hole packages |
| Integral heat sink locking tab | Provides mechanical retention during reflow and direct thermal conduction path from junction to PCB copper |
| Full metallic bottom | Eliminates solder flux entrapment risk during assembly, improving long-term reliability and solder joint integrity |
| ESD robustness | >16 kV HBM rating reduces need for external protection circuitry in board-level ESD-sensitive systems |
| Low knee impedance | 0.25 Ω at IZK enables stable regulation even at very low bias currents near turn-on threshold |
Applications
| DC Power Supply Regulation | Overvoltage Protection Circuit |
|---|---|
Use Scenario: Stabilizing output voltage in low-power linear regulators or feedback networks of switching supplies. IC Role / Device Role / Timing Role: Precision voltage reference element providing stable 39 V reference for error amplifiers or comparator thresholds. Use Value: Tight ±5% VZ tolerance and low ZZT ensure <±0.5 V regulation deviation across load and temperature variations. | Use Scenario: Clamping transient surges on 36–42 V rail systems such as automotive body control modules. IC Role / Device Role / Timing Role: Shunt overvoltage protector diverting excess energy to ground when rail exceeds 39 V. Use Value: 3.0 W power rating and 30°C/W thermal resistance allow sustained clamping without thermal runaway under 100 ms transients. |
| Industrial Sensor Signal Conditioning | Programmable Logic Controller (PLC) Input Protection |
Use Scenario: Biasing and protecting analog front-end inputs of 4–20 mA current-loop receivers. IC Role / Device Role / Timing Role: Zener-based voltage limiter establishing safe common-mode input range for op-amps or ADC drivers. Use Value: Low IR (≤900 µA) prevents loading of high-impedance sensor outputs; >16 kV HBM withstands field-induced ESD events. | Use Scenario: Protecting digital input channels against induced surges on factory-floor wiring harnesses. IC Role / Device Role / Timing Role: Primary shunt clamp on 24 V DC input lines before optocoupler or Schmitt trigger interface. Use Value: Fast response to overvoltage and robust 3.0 W surge absorption prevent latch-up or damage to downstream logic ICs. |
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 |
|---|---|---|---|
| ON Semiconductor MMBZ5247BS | 39 V, 250 mW SOT-23 package; higher ZZT (70 Ω); lower power rating | Suitable only for low-power signal-level referencing, not for 3 W clamping | Select when board space is critical and power demand ≤250 mW |
| Vishay PLZ39 | 39 V, 1.3 W in DO-214AC; no metallic tab; thermal resistance ~60°C/W | Limited to medium-duty clamping; requires larger copper area for equivalent thermal performance | Select when legacy DO-214AC footprint is mandated and 1.3 W suffices |
Compared with MMBZ5247BS and PLZ39, the 1PMT5939B delivers 12× higher power capability than the SOT-23 part and half the thermal resistance of the DO-214AC alternative - making it uniquely suited for high-reliability, high-power-density Zener applications where thermal management and surge resilience are critical.
Availability
1PMT5939B is available at Aetrix Electronics and suitable for DC power supply regulation, overvoltage protection circuits, and industrial sensor signal conditioning requiring stable component supply and consistent parametric performance across production lots.
Supply support for 1PMT5939B 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 semiconductor manufacturer specializing in high-reliability analog, mixed-signal, and radiation-hardened components for aerospace, defense, and industrial markets.
The Powermite® Zener series was designed for high-power-density surface-mount voltage regulation and transient suppression in space-constrained, thermally demanding environments - emphasizing thermal robustness, ESD resilience, and automated assembly compatibility.
FAQ
What is the zener voltage tolerance for 1PMT5939B?
The 1PMT5939B 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% and ±1%) are available with suffixes C and D respectively, but the base 1PMT5939B part uses ±5%.
Can 1PMT5939B be used in place of a through-hole 1N5247B?
No - the 1PMT5939B is not a drop-in replacement for the 1N5247B. While both are 39 V Zeners, the 1PMT5939B is a 3.0 W surface-mount Powermite® device with thermal design centered on TAB 1, whereas the 1N5247B is a 0.5 W through-hole device in DO-35. Their power ratings, thermal paths, and footprints are incompatible.
What is the maximum reverse voltage that can be applied to 1PMT5939B before breakdown?
The 1PMT5939B begins regulating at its nominal zener voltage of 39 V, with breakdown occurring within ±5% of that value. The absolute maximum reverse voltage before irreversible damage is not specified separately - operation beyond VZ risks exceeding the 3.0 W power limit unless current is strictly limited by external series resistance.
How does the Powermite® package improve thermal performance compared to standard SOD-123?
The Powermite® package of the 1PMT5939B features a full metallic bottom and integral locking tab that directly conducts heat from the junction to the PCB, achieving 30°C/W junction-to-TAB thermal resistance. In contrast, standard SOD-123 packages rely on lead-frame conduction and typically exceed 100°C/W, limiting usable power to <0.5 W.
Is 1PMT5939B suitable for automotive applications?
Yes - the 1PMT5939B is qualified for operation from -55°C to +150°C junction temperature and carries >16 kV HBM ESD rating, meeting core requirements for under-hood and body-control module applications. Its Powermite® package also supports automated reflow assembly compatible with AEC-Q200 stress testing protocols.
1PMT5939/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
1PMT5939/TR7 FAQ
1.How can I place an order for 1PMT5939/TR7 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1PMT5939/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 1PMT5939/TR7 reliable?
The price and inventory of 1PMT5939/TR7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1PMT5939/TR7 is usually 5 days.
3.What payment methods are accepted for 1PMT5939/TR7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1PMT5939/TR7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1PMT5939/TR7?
1PMT5939/TR7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1PMT5939/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 1PMT5939/TR7?
For technical support, including 1PMT5939/TR7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1PMT5939/TR7 requirements.
6.How does Aetrix verify that 1PMT5939/TR7 is sourced from the original manufacturer or authorized distributors?
All 1PMT5939/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 1PMT5939/TR7 meets industry standards.
7.What is the process for return or replacement of 1PMT5939/TR7?
All 1PMT5939/TR7 units undergo pre-shipment inspection (PSI). If there is an issue with 1PMT5939/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 1PMT5939/TR7 part is unused and in its original packaging.
Return procedure for 1PMT5939/TR7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1PMT5939/TR7 Tags
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