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Microchip Technology 1PMT5942CE3/TR7
- Part No.:
- 1PMT5942CE3/TR7
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-216AA
- Datasheet:
-
1PMT5942CE3/TR7.pdf
- Description:
- DIODE ZENER 51V 3W DO216AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,089
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Product details
Overview
1PMT5942CE3/TR7 from Microsemi is a 51 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 70 Ω dynamic impedance at 7.3 mA test current and 1100 µA max reverse leakage at 38.8 V. It serves as a precision voltage reference or overvoltage clamp in power supply regulation circuits.
For engineers reviewing the 1PMT5942CE3/TR7 datasheet, 1PMT5942CE3/TR7 pinout, 1PMT5942CE3/TR7 application, or 1PMT5942CE3/TR7 equivalent, key selection criteria include Zener voltage tolerance (±5%), thermal resistance (30°C/W junction-to-TAB), ESD rating (>16 kV HBM), low knee impedance (450 Ω at 0.25 mA), and compatibility with automated SMT assembly.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable voltage across load variations and temperature shifts. Its Powermite® package features a full metallic bottom and integral heat sink locking tab, enabling efficient thermal conduction directly from the junction to the PCB pad via TAB 1 - the cathode terminal.
The device exhibits tight voltage regulation with 70 Ω dynamic impedance at IZT = 7.3 mA and maintains ≤1100 µA reverse leakage at VR = 38.8 V, supporting reliable clamping in 12–48 V industrial power rails where low leakage and predictable knee behavior are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 51 V ±5% at IZT = 7.3 mA - defines nominal clamping level for overvoltage protection |
| Power Dissipation | 3.0 W at TAB 1 = 60°C - sets maximum continuous thermal load under standard mounting |
| Dynamic Impedance ZZT | 70 Ω at 7.3 mA - determines voltage deviation under small-signal current changes |
| Knee Impedance ZZK | 450 Ω at IZK = 0.25 mA - indicates onset of stable regulation at low current |
| Reverse Leakage IR | ≤1100 µA at VR = 38.8 V - ensures minimal standby power loss in high-impedance bias networks |
| Thermal Resistance | 30°C/W junction-to-TAB1 - enables direct thermal path design to copper pour or heatsink pad |
| ESD Rating | >16 kV per Human Body Model - supports robust handling in unshielded manufacturing environments |
Pinout & Package
The 1PMT5942CE3/TR7 uses a DO-216AA (Powermite®) surface-mount package with molded plastic body and full metallic bottom. Cathode is designated by TAB 1; anode is the opposite end. Mounting orientation is unrestricted.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TAB 1 | Cathode | Primary thermal and electrical connection point; must be soldered to large copper area for heat dissipation |
| Opposite End | Anode | Standard anode terminal; connects to lower-potential node in reverse-biased configuration |
Key Features
| Feature | Design Value |
|---|---|
| Integral heat sink locking tab | Mechanically anchors device during reflow and enhances thermal transfer from junction to PCB |
| Full metallic bottom | Eliminates solder flux entrapment risk and improves thermal conductivity vs. plastic-bottom SMD packages |
| Automated insertion compatibility | Designed for pick-and-place and reflow processes per EIA-481 tape-and-reel standards |
| Low reverse leakage | ≤1100 µA at 38.8 V enables use in high-impedance reference divider networks without loading error |
Applications
| Industrial Power Supply Regulation | Automotive ECUs |
|---|---|
Use Scenario: Stabilizing feedback voltage in isolated DC-DC converters operating from 24 V bus. IC Role / Device Role / Timing Role: Zener reference diode providing precise 51 V clamp for optocoupler bias and overvoltage detection. Use Value: Maintains regulation accuracy within ±5% across -55°C to +150°C ambient, supporting ASIL-B system compliance. | Use Scenario: Overvoltage protection on LIN bus transceiver power rail subject to load dump transients. IC Role / Device Role / Timing Role: Clamp diode shunting transient energy above 51 V to ground before IC damage occurs. Use Value: Withstands >16 kV HBM ESD and dissipates 3.0 W peak surge energy without parameter shift. |
| Telecom Line Card Protection | Programmable Logic Controller I/O Modules |
Use Scenario: Protecting 48 V backplane interface circuitry from induced surges and hot-swap spikes. IC Role / Device Role / Timing Role: Primary Zener clamp in multi-stage TVS+Zener protection network. Use Value: Low 70 Ω dynamic impedance ensures fast response to sub-microsecond transients while limiting clamping overshoot. | Use Scenario: Providing stable reference voltage for analog input scaling in 24 V PLC analog modules. IC Role / Device Role / Timing Role: Precision voltage reference element in resistor-divider networks feeding ADC inputs. Use Value: Tight 5% tolerance and low 1100 µA leakage minimize gain error and offset drift over temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5942B | Same 51 V Zener voltage, but in DO-41 through-hole package; no metallic bottom or locking tab; 500 mW rating | Requires manual or wave soldering; unsuitable for high-power SMT designs or automated placement | Select only when board-level repair or legacy through-hole compatibility is required |
| SMBJ51A | 51 V unidirectional TVS diode in SMB package; 600 W peak pulse power; higher clamping voltage (~70 V) | Designed for transient suppression, not precision regulation; lacks tight Zener tolerance or low leakage | Choose for surge-only protection; avoid where stable DC reference or low-leakage bias is needed |
Compared with 1N5942B and SMBJ51A, the 1PMT5942CE3/TR7 uniquely combines SMT manufacturability, 3.0 W continuous power, metallic thermal path, and ±5% Zener tolerance - making it optimal for space-constrained, thermally demanding, precision-clamp applications.
Availability
1PMT5942CE3/TR7 is available at Aetrix Electronics and suitable for industrial power supplies, automotive control units, telecom line cards, and programmable logic controller I/O modules requiring stable component supply and long-term obsolescence management.
Supply support for 1PMT5942CE3/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 series, including the 1PMT5942CE3/TR7, was designed for high-power-density surface-mount voltage regulation and transient clamping in harsh-environment systems where thermal performance and assembly reliability are critical.
FAQ
What is the Zener voltage tolerance for 1PMT5942CE3/TR7?
The 1PMT5942CE3/TR7 has a nominal Zener voltage of 51 V with a standard tolerance of ±5%, measured at IZT = 7.3 mA and TAB temperature of 30°C. Tighter tolerances (±2% and ±1%) are available with suffixes C and D, respectively, but the CE3/TR7 variant specifies ±5%.
How is thermal management handled in the 1PMT5942CE3/TR7 package?
The 1PMT5942CE3/TR7 uses a Powermite® package with a full metallic bottom and TAB 1 as the cathode - which serves as both electrical terminal and primary thermal path. Its specified junction-to-TAB thermal resistance is 30°C/W, enabling effective heat transfer to the PCB when TAB 1 is soldered to a sufficient copper area.
Is the 1PMT5942CE3/TR7 compatible with automated SMT assembly?
Yes, the 1PMT5942CE3/TR7 is explicitly designed for compatibility with automatic insertion equipment and standard SMT reflow processes. It ships in EIA-481 tape-and-reel format (7-inch reel, 3,000 pieces), and its locking tab and metallic bottom prevent flux entrapment and improve placement stability.
What is the maximum reverse leakage current for 1PMT5942CE3/TR7?
The maximum reverse leakage current for 1PMT5942CE3/TR7 is 1100 µA at a reverse voltage of 38.8 V and ambient temperature of 30°C. This low leakage supports use in high-impedance bias networks and precision reference circuits without introducing significant error.
Does the 1PMT5942CE3/TR7 meet any ESD immunity standards?
Yes, the 1PMT5942CE3/TR7 is rated for >16 kV electrostatic discharge per the Human Body Model (HBM), as confirmed in the Microsemi MSC0995 datasheet. This rating supports robust handling during board assembly and operation in electrostatic-prone industrial environments.
1PMT5942CE3/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):
- 51 V
- Tolerance:
- ±2%
- Power - Max:
- 3 W
- Impedance (Max) (Zzt):
- 70 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 38.8 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
1PMT5942CE3/TR7 FAQ
1.How can I place an order for 1PMT5942CE3/TR7 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1PMT5942CE3/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 1PMT5942CE3/TR7 reliable?
The price and inventory of 1PMT5942CE3/TR7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1PMT5942CE3/TR7 is usually 5 days.
3.What payment methods are accepted for 1PMT5942CE3/TR7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1PMT5942CE3/TR7 transactions.
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4.How is shipping managed for 1PMT5942CE3/TR7?
1PMT5942CE3/TR7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1PMT5942CE3/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 1PMT5942CE3/TR7?
For technical support, including 1PMT5942CE3/TR7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1PMT5942CE3/TR7 requirements.
6.How does Aetrix verify that 1PMT5942CE3/TR7 is sourced from the original manufacturer or authorized distributors?
All 1PMT5942CE3/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 1PMT5942CE3/TR7 meets industry standards.
7.What is the process for return or replacement of 1PMT5942CE3/TR7?
All 1PMT5942CE3/TR7 units undergo pre-shipment inspection (PSI). If there is an issue with 1PMT5942CE3/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 1PMT5942CE3/TR7 part is unused and in its original packaging.
Return procedure for 1PMT5942CE3/TR7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1PMT5942CE3/TR7 Tags
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MMBZ5240B-7-F
Diodes Incorporated
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