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Microchip Technology 1PMT5945BE3/TR7
- Part No.:
- 1PMT5945BE3/TR7
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-216AA
- Datasheet:
-
1PMT5945BE3/TR7.pdf
- Description:
- DIODE ZENER 68V 3W DO216AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,853
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Product details
Overview
1PMT5945BE3/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 5.5 mA test current (IZT), 120 Ω dynamic impedance (ZZT), and <1 µA reverse leakage at 51.2 V. It serves as a precision voltage reference or overvoltage clamp in power supply regulation and transient protection circuits.
For engineers reviewing the 1PMT5945BE3/TR7 datasheet, 1PMT5945BE3/TR7 pinout, 1PMT5945BE3/TR7 application, or 1PMT5945BE3/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 in reverse breakdown mode with tightly controlled voltage regulation across its specified test current range. Its Powermite® package features a full metallic bottom for flux-free soldering and an integral locking tab that functions as both mechanical anchor and heat sink, enabling efficient thermal transfer to the PCB pad.
The device exhibits low reverse leakage (<1 µA at VR = 51.2 V), a sharp knee characteristic (IZK = 0.25 mA, ZZK = 1700 Ω), and stable performance across -55°C to +150°C junction temperature range - critical for industrial and automotive power rail stabilization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 68 V ±5% at IZT = 5.5 mA - defines nominal clamping/reference level under standard test conditions |
| Power Dissipation | 3.0 W at TAB 1 = 60°C - maximum steady-state power handling with defined thermal boundary condition |
| Dynamic Impedance (ZZT) | 120 Ω at IZT - indicates voltage regulation stiffness; lower values improve load regulation |
| Reverse Leakage (IR) | <1 µA at VR = 51.2 V - ensures minimal standby current in high-impedance bias networks |
| Thermal Resistance | 30°C/W junction-to-TAB - quantifies thermal path efficiency from die to mounting pad |
| ESD Rating | >16 kV per Human Body Model - supports robust handling and board-level ESD immunity |
| Knee Current (IZK) | 0.25 mA - minimum current required to enter useful regulation region |
Pinout & Package
Package: Powermite® (DO-216AA), molded surface-mount package with full metallic bottom and integral heat-sink locking tab; cathode designated by TAB 1.
| 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 and electrical performance |
| Lead 2 | Anode | Standard anode terminal; reverse-biased during Zener operation |
Key Features
| Feature | Design Value |
|---|---|
| Surface-mount Powermite® package | Enables automated placement and reflow while delivering 3 W power handling in footprint comparable to smaller diodes |
| Integral heat-sink locking tab | Provides mechanical retention during assembly and reduces thermal resistance by direct metal-to-PCB conduction |
| Full metallic bottom | Eliminates solder flux entrapment risk - improves long-term reliability and solder joint integrity |
| ESD robustness | >16 kV HBM rating supports handling in non-ESD-controlled environments without degradation |
| Tight voltage tolerance option | ±2% (suffix C) and ±1% (suffix D) available - enables higher-precision reference designs |
Applications
| Industrial Power Supply Regulation | Automotive Load Dump Protection |
|---|---|
Use Scenario: Stabilizing feedback voltage in isolated DC-DC converters operating in harsh ambient temperatures. IC Role / Device Role / Timing Role: Precision Zener reference providing stable 68 V threshold for optocoupler-based feedback loop. Use Value: Maintains output regulation accuracy within ±5% despite input transients and thermal drift up to +125°C ambient. | Use Scenario: Clamping induced voltage spikes during alternator load dump events in 12 V vehicle systems. IC Role / Device Role / Timing Role: Transient voltage suppressor placed across sensitive control IC inputs. Use Value: Limits peak voltage to ≤68 V with fast response and 3 W surge capability, protecting downstream logic. |
| Programmable Logic Controller I/O Protection | Telecom Line Card Voltage Reference |
Use Scenario: Protecting digital input channels from field-wiring faults and inductive kickback in factory automation systems. IC Role / Device Role / Timing Role: Overvoltage clamp on 24 V DC input circuitry before signal conditioning stage. Use Value: Prevents latch-up or damage to microcontroller GPIOs using low-leakage (<1 µA) behavior below 51.2 V. | Use Scenario: Providing stable bias voltage for analog front-end amplifiers in telecom base station line cards. IC Role / Device Role / Timing Role: Low-noise Zener reference source for ADC reference buffer circuits. Use Value: Delivers 68 V reference with 120 Ω dynamic impedance, minimizing noise coupling into precision analog paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5945BRLG | Same 68 V nominal voltage, but DO-41 through-hole package; 1.5 W rating; no metallic tab or locking feature | Requires manual or wave soldering; unsuitable for high-density SMT layouts or thermal-intensive designs | Select only when legacy through-hole assembly or lower power (≤1.5 W) operation is acceptable |
| BZX84-C68LT1G | SOT-23 package; 68 V ±5%; 300 mW rating; 40 Ω ZZT; no integrated heat sink | Limited to low-power biasing; cannot sustain 3 W continuous dissipation or handle high-energy transients | Choose for space-constrained logic-level references - not for power rail clamping or thermal cycling environments |
Compared with 1N5945BRLG and BZX84-C68LT1G, the 1PMT5945BE3/TR7 uniquely combines 3 W power handling, SMT compatibility, and integrated thermal management in a single surface-mount Zener - making it the only viable choice for high-reliability, thermally demanding industrial clamping applications.
Availability
1PMT5945BE3/TR7 is available at Aetrix Electronics and suitable for industrial power supply regulation, automotive load dump protection, and programmable logic controller I/O protection requiring stable component supply and long-term lifecycle support.
Supply support for 1PMT5945BE3/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 with superior thermal performance and assembly robustness - specifically targeting mission-critical power management in constrained PCB layouts.
FAQ
What is the zener voltage tolerance for 1PMT5945BE3/TR7?
The 1PMT5945BE3/TR7 has a standard zener voltage tolerance of ±5% at 68 V, measured at IZT = 5.5 mA and TAB temperature of 30°C. Tighter tolerances of ±2% (suffix C) and ±1% (suffix D) are available as custom order options, but the base 1PMT5945BE3/TR7 conforms strictly to the ±5% specification per MSC0995 Rev F.
Can 1PMT5945BE3/TR7 be used in reflow soldering processes?
Yes, the 1PMT5945BE3/TR7 is qualified for standard lead-free reflow soldering per J-STD-020. Its Powermite® package withstands peak temperatures up to 260°C, and the full metallic bottom ensures uniform thermal distribution and eliminates flux entrapment - making it fully compatible with automated SMT assembly lines.
What is the maximum reverse voltage (VR) rating for 1PMT5945BE3/TR7?
The maximum reverse voltage (VR) for 1PMT5945BE3/TR7 is 51.2 V, at which the reverse leakage current is guaranteed to remain below 1 µA. This value corresponds to 75% of the nominal 68 V zener voltage and defines the safe non-breakdown operating limit before entering regulation.
How does the thermal resistance of 1PMT5945BE3/TR7 affect PCB layout?
The 1PMT5945BE3/TR7 has a junction-to-TAB thermal resistance of 30°C/W. To maintain safe operation at 3.0 W, the PCB pad connected to TAB 1 must provide sufficient copper area and thermal vias to keep TAB temperature ≤60°C. Insufficient copper will cause junction overheating and premature failure.
Is 1PMT5945BE3/TR7 RoHS compliant?
Yes, 1PMT5945BE3/TR7 is RoHS compliant and lead-free. It meets EU Directive 2011/65/EU requirements and is manufactured using Pb-free terminations and halogen-free molding compounds, as confirmed in Microsemi's official compliance documentation aligned with MSC0995 Rev F.
1PMT5945BE3/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:
- ±5%
- 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
1PMT5945BE3/TR7 FAQ
1.How can I place an order for 1PMT5945BE3/TR7 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1PMT5945BE3/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 1PMT5945BE3/TR7 reliable?
The price and inventory of 1PMT5945BE3/TR7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1PMT5945BE3/TR7 is usually 5 days.
3.What payment methods are accepted for 1PMT5945BE3/TR7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1PMT5945BE3/TR7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1PMT5945BE3/TR7?
1PMT5945BE3/TR7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1PMT5945BE3/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 1PMT5945BE3/TR7?
For technical support, including 1PMT5945BE3/TR7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1PMT5945BE3/TR7 requirements.
6.How does Aetrix verify that 1PMT5945BE3/TR7 is sourced from the original manufacturer or authorized distributors?
All 1PMT5945BE3/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 1PMT5945BE3/TR7 meets industry standards.
7.What is the process for return or replacement of 1PMT5945BE3/TR7?
All 1PMT5945BE3/TR7 units undergo pre-shipment inspection (PSI). If there is an issue with 1PMT5945BE3/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 1PMT5945BE3/TR7 part is unused and in its original packaging.
Return procedure for 1PMT5945BE3/TR7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1PMT5945BE3/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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MMSZ4682T1G
onsemi
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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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