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Microchip Technology 1PMT5945CE3/TR7
- Part No.:
- 1PMT5945CE3/TR7
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-216AA
- Datasheet:
-
1PMT5945CE3/TR7.pdf
- Description:
- DIODE ZENER 68V 3W DO216AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,162
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Product details
Overview
1PMT5945CE3/TR7 from Microsemi is a 68 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 120 Ω dynamic impedance at 5.5 mA test current and 1700 µA max reverse leakage at 51.2 V, used for precision voltage regulation and overvoltage protection in power supply feedback loops.
For engineers reviewing the 1PMT5945CE3/TR7 datasheet, 1PMT5945CE3/TR7 pinout, 1PMT5945CE3/TR7 application, or 1PMT5945CE3/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, and compatibility with automated SMT assembly.
Technical Context
This Zener diode operates as a two-terminal voltage reference device with cathode designated by TAB 1, optimized for stable regulation under varying load and temperature conditions. Its full metallic bottom eliminates solder flux entrapment, and integral locking tab provides mechanical retention and thermal conduction to the PCB.
The device exhibits tight voltage control across its 5.5 mA test current (IZT) and maintains low reverse leakage (≤1700 µA at VR = 51.2 V), with dynamic impedance measured using 60 Hz RMS AC superimposed on IZT per Micro Note 202.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 68 V ±5% at IZT = 5.5 mA, TL = 30°C - defines nominal regulation point with production-grade tolerance |
| Power Dissipation | 3.0 W at TAB 1 = 60°C - sets maximum continuous power handling with defined thermal boundary condition |
| Dynamic Impedance (ZZT) | 120 Ω at IZT = 5.5 mA - determines output voltage stability under small-signal current variation |
| Reverse Leakage (IR) | ≤1700 µA at VR = 51.2 V - specifies maximum off-state current before breakdown onset |
| Thermal Resistance | 30°C/W junction-to-TAB1 - quantifies thermal path efficiency from die to mounting pad |
| ESD Rating | >16 kV per Human Body Model - ensures robustness against electrostatic discharge during handling and assembly |
| Knee Impedance (ZZK) | 0.25 Ω at IZK = 1 mA - indicates low-impedance behavior near breakdown threshold |
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; DO-216 outline.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TAB 1 | Cathode | Primary thermal and electrical connection point; must be soldered to copper pour for thermal management and circuit return |
| Lead 2 | Anode | Standard anode terminal; mounted opposite TAB 1; requires standard SMT pad layout per DO-216 mechanical drawing |
Key Features
| Feature | Design Value |
|---|---|
| Surface-mount Powermite® package | Enables high-density PCB layouts while delivering 3.0 W power handling traditionally found in larger through-hole packages |
| Full metallic bottom | Eliminates solder flux entrapment during reflow, improving long-term reliability and reducing post-assembly cleaning requirements |
| Integral heat-sink locking tab | Provides mechanical anchoring during automatic insertion and enhances thermal conduction from junction to PCB |
| ESD robustness | >16 kV HBM rating reduces risk of field failure in handling-sensitive industrial and automotive environments |
| Low knee impedance | 0.25 Ω at 1 mA enables stable regulation even near breakdown threshold, critical for low-current bias networks |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Clamp Circuit |
|---|---|
Use Scenario: Regulating output voltage in isolated flyback or forward converters via optocoupler-coupled feedback loop. IC Role / Device Role / Timing Role: Zener reference element setting precise error amplifier threshold at secondary-side controller input. Use Value: 68 V ±5% tolerance and 120 Ω dynamic impedance ensure accurate, repeatable regulation across temperature and line/load variations. | Use Scenario: Protecting downstream ICs from transient overvoltage events on 48 V DC bus lines in telecom infrastructure. IC Role / Device Role / Timing Role: Shunt clamping device diverting excess energy to ground when bus exceeds safe operating limit. Use Value: 3.0 W power rating and 30°C/W thermal resistance allow sustained clamping without thermal runaway under repetitive surges. |
| Industrial Sensor Excitation | Programmable Voltage Reference |
Use Scenario: Providing stable excitation voltage to resistive bridge sensors in harsh factory-floor environments. IC Role / Device Role / Timing Role: Precision voltage source establishing known bias point for Wheatstone bridge operation. Use Value: Low reverse leakage (≤1700 µA) minimizes measurement offset drift; >16 kV ESD rating prevents damage from operator contact discharge. | Use Scenario: Serving as primary reference in analog front-end circuits requiring stable, low-drift DC voltage. IC Role / Device Role / Timing Role: Two-terminal passive reference providing fixed 68 V node for calibration or scaling functions. Use Value: Tight 5% tolerance and predictable knee behavior enable predictable design margins without iterative trimming. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5945BTR | Same 68 V nominal voltage, but in DO-41 through-hole package; no metallic bottom or locking tab; 3.0 W rating at 50°C ambient | Requires manual or wave soldering; unsuitable for high-density SMT designs; higher thermal resistance (~50°C/W) | Select only if legacy through-hole assembly or thermal derating flexibility is prioritized over board space and ESD robustness |
| BZX84-C68LT1G | SOT-23 package; 68 V ±5%; 300 mW power rating; 100 Ω typical ZZT; 100 nA IR at 54.4 V | Lower power capability limits use to signal-level clamping or biasing; not suitable for 3 W regulation or surge suppression | Choose for low-power, space-constrained applications where 3 W dissipation is unnecessary and ultra-low leakage is critical |
Compared with 1N5945BTR and BZX84-C68LT1G, the 1PMT5945CE3/TR7 uniquely combines 3.0 W SMT power handling, metallic thermal interface, and >16 kV ESD rating-making it the only option among the three qualified for ruggedized, high-reliability power regulation in automated manufacturing environments.
Availability
1PMT5945CE3/TR7 is available at Aetrix Electronics and suitable for switch-mode power supplies, overvoltage protection circuits, and industrial sensor excitation systems requiring stable component supply with consistent parametric performance and long-term lifecycle support.
Supply support for 1PMT5945CE3/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, thermally demanding SMT applications where traditional axial or DO-41 packages cannot meet thermal or automation requirements.
FAQ
What is the zener voltage tolerance for 1PMT5945CE3/TR7?
The 1PMT5945CE3/TR7 has a standard zener voltage tolerance of ±5% at 68 V, measured at IZT = 5.5 mA with TAB 1 temperature held at 30°C. Tighter tolerances (±2%, ±1%) are available with suffixes C and D respectively, but the CE3/TR7 variant uses the standard ±5% grade. This tolerance directly impacts regulation accuracy in feedback and reference applications.
How is thermal performance specified for 1PMT5945CE3/TR7?
The 1PMT5945CE3/TR7 specifies a thermal resistance of 30°C/W from junction to TAB 1, meaning each watt dissipated raises the junction temperature 30°C above the TAB temperature. Its 3.0 W power rating assumes TAB 1 is maintained at 60°C. Effective PCB copper area under TAB 1 is essential to achieve this rating in practice.
Is 1PMT5945CE3/TR7 compatible with lead-free reflow processes?
Yes, the 1PMT5945CE3/TR7 is qualified for standard lead-free reflow profiles per J-STD-020. Its Powermite® package construction-including full metallic bottom and molded body-is designed to withstand peak temperatures up to 260°C. The device is supplied in EIA-481 tape-and-reel format (7″ reel, 3,000 pieces) for automated placement.
What does the 'E3/TR7' suffix indicate in 1PMT5945CE3/TR7?
The 'E3' denotes compliance with JEDEC J-STD-020 moisture sensitivity level 3 (MSL3), requiring bake-out if exposed to ambient beyond floor life. 'TR7' specifies packaging in 7-inch tape-and-reel per EIA-481, containing 3,000 units. This distinguishes it from bulk or different reel-size variants of the same 1PMT5945C base part.
Can 1PMT5945CE3/TR7 be used in place of 1N5945B in existing designs?
No direct substitution is recommended without layout and thermal redesign. While both are 68 V Zeners, the 1PMT5945CE3/TR7 uses a surface-mount Powermite® package with TAB 1 cathode, whereas the 1N5945B is DO-41 through-hole. Their thermal paths, mounting methods, and PCB footprints differ fundamentally-requiring new land patterns and re-evaluation of thermal performance.
1PMT5945CE3/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):
- 68 V
- Tolerance:
- ±2%
- Power - Max:
- 3 W
- Impedance (Max) (Zzt):
- 120 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 51.2 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
1PMT5945CE3/TR7 FAQ
1.How can I place an order for 1PMT5945CE3/TR7 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1PMT5945CE3/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 1PMT5945CE3/TR7 reliable?
The price and inventory of 1PMT5945CE3/TR7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1PMT5945CE3/TR7 is usually 5 days.
3.What payment methods are accepted for 1PMT5945CE3/TR7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1PMT5945CE3/TR7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1PMT5945CE3/TR7?
1PMT5945CE3/TR7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1PMT5945CE3/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 1PMT5945CE3/TR7?
For technical support, including 1PMT5945CE3/TR7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1PMT5945CE3/TR7 requirements.
6.How does Aetrix verify that 1PMT5945CE3/TR7 is sourced from the original manufacturer or authorized distributors?
All 1PMT5945CE3/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 1PMT5945CE3/TR7 meets industry standards.
7.What is the process for return or replacement of 1PMT5945CE3/TR7?
All 1PMT5945CE3/TR7 units undergo pre-shipment inspection (PSI). If there is an issue with 1PMT5945CE3/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 1PMT5945CE3/TR7 part is unused and in its original packaging.
Return procedure for 1PMT5945CE3/TR7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1PMT5945CE3/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
Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
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SMAJ4744A-TP
Micro Commercial Co
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BZT52C3V6LP-7
Diodes Incorporated
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SMAZ12-13-F
Diodes Incorporated
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