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Microchip Technology 1PMT5945BE3/TR13
- Part No.:
- 1PMT5945BE3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-216AA
- Datasheet:
-
1PMT5945BE3/TR13.pdf
- Description:
- DIODE ZENER 68V 3W DO216AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,770
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Product details
Overview
1PMT5945BE3/TR13 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 1700 µA max reverse leakage (IR) at 51.2 V. It serves as a precision voltage reference or overvoltage clamp in DC power rails and regulator feedback paths.
For engineers reviewing the 1PMT5945BE3/TR13 datasheet, 1PMT5945BE3/TR13 pinout, 1PMT5945BE3/TR13 application, or 1PMT5945BE3/TR13 equivalent, key selection criteria include its 68 V nominal Zener voltage, 3.0 W thermal capability via metallic tab, DO-216 mechanical outline, ESD rating >16 kV HBM, and compatibility with automated SMT placement equipment.
Technical Context
This device operates as a two-terminal voltage-regulating diode, leveraging silicon PN junction avalanche breakdown to maintain stable reverse-bias voltage across load variations. Its Zener voltage is specified at IZT = 5.5 mA with thermal control at TAB 1 (cathode terminal), where junction-to-tab thermal resistance is 30°C/W.
The Powermite® package integrates a full metallic bottom and locking tab that functions as both mechanical anchor and primary heat path-enabling 3.0 W dissipation without external heatsinking when mounted on ≥1 sq-in copper area. Reverse leakage remains ≤1700 µA at VR = 51.2 V, supporting low-power biasing and sensing applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 68 V ±5% at IZT = 5.5 mA; defines stable regulation point for feedback or clamping circuits |
| Power Dissipation | 3.0 W at TAB 1 = 60°C; enables high-energy transient suppression without derating in compact layouts |
| Dynamic Impedance (ZZT) | 120 Ω at 60 Hz, 10% IZT AC superimposed; indicates voltage stability under small-signal ripple |
| Reverse Leakage (IR) | ≤1700 µA at VR = 51.2 V; ensures minimal quiescent current in standby or battery-backed systems |
| Thermal Resistance | 30°C/W junction-to-TAB1; allows direct thermal coupling to PCB copper for passive cooling |
| ESD Rating | >16 kV per Human Body Model; supports robust handling in unshielded assembly environments |
| Package Outline | DO-216 (Powermite®); 3.0 mm × 1.5 mm footprint with integral cathode tab for automated optical recognition |
Pinout & Package
Package: Powermite® (DO-216), molded surface-mount housing with full metallic bottom and cathode-designated TAB 1. Dimensions: 3.0 mm × 1.5 mm × 1.1 mm (L×W×H), weight ≈ 0.016 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TAB 1 | Cathode | Primary heat sink and electrical cathode connection; must be soldered to ≥1 sq-in copper pour for rated 3.0 W operation |
| Lead 2 | Anode | Standard anode terminal; electrically isolated from TAB 1; used for series connection in voltage-reference networks |
Key Features
| Feature | Design Value |
|---|---|
| Integral heat sink tab | TAB 1 serves as both cathode and low-thermal-resistance path (30°C/W) to PCB, eliminating need for discrete heatsinks |
| Full metallic bottom | Prevents solder flux entrapment during reflow, reducing post-assembly cleaning and voiding risks |
| Automated insertion compatibility | DO-216 outline and TAB 1 polarity marker support vision-guided pick-and-place with >99.9% placement yield |
| High ESD immunity | >16 kV HBM rating enables safe handling in Class 0 ESD areas without additional protection circuitry |
Applications
| DC Power Rail Clamping | Feedback Reference for Switchers |
|---|---|
Use Scenario: Protecting 48 V telecom line cards from lightning-induced surges up to 3.0 W peak energy. IC Role / Device Role / Timing Role: Zener diode acting as shunt overvoltage clamp, diverting excess current to ground when rail exceeds 68 V. Use Value: Maintains system uptime by clamping transients within 100 ns while surviving repeated 3.0 W pulses due to Powermite® thermal design. | Use Scenario: Providing precise 68 V reference in isolated flyback converter feedback loop for industrial PLC power supplies. IC Role / Device Role / Timing Role: Voltage reference element setting output regulation threshold via optocoupler bias network. Use Value: ±5% VZ tolerance and low ZZT ensure <±1.5% output voltage drift across line/load/temperature in 200 kHz switching designs. |
| Low-Power Sensor Biasing | Programmable Threshold Detector |
Use Scenario: Biasing high-impedance pressure sensor bridges in battery-powered IoT nodes operating at 3.3 V MCU logic. IC Role / Device Role / Timing Role: Stable voltage source for excitation of Wheatstone bridge elements, referenced to system ground. Use Value: 1700 µA max IR at 51.2 V ensures <1 µA loading error on 10 MΩ bridge arms, preserving measurement resolution. | Use Scenario: Setting trip point for comparator-based brown-out detection in automotive body control modules. IC Role / Device Role / Timing Role: Zener-defined threshold voltage applied to comparator non-inverting input for supply monitoring. Use Value: 68 V nominal VZ with 120 Ω ZZT delivers consistent 50 mV hysteresis window across temperature, preventing chatter during slow-ramp undervoltage events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMCJ68A | TVS diode (not Zener); 68 V standoff, 1500 W peak pulse power, higher capacitance (150 pF) | Designed for transient suppression only-not suitable for DC regulation or biasing | Select only for surge-only protection; not interchangeable for voltage reference use |
| 1N5365B | Through-hole DO-201AD package; same 68 V/3 W rating but 60°C/W thermal resistance and no metallic tab | Requires larger PCB area and external heatsinking for equivalent power handling | Choose only when legacy through-hole assembly is mandatory; SMT efficiency lost |
Compared with SMCJ68A and 1N5365B, the 1PMT5945BE3/TR13 uniquely combines 3.0 W DC regulation, DO-216 SMT compatibility, and 30°C/W thermal performance-making it optimal for space-constrained, thermally demanding voltage reference designs where long-term DC stability matters.
Availability
1PMT5945BE3/TR13 is available at Aetrix Electronics and suitable for DC power rail clamping, switch-mode power supply feedback references, low-power sensor biasing, and programmable threshold detection requiring stable component supply and repeatable thermal performance.
Supply support for 1PMT5945BE3/TR13 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 for high-power-density voltage regulation in automated SMT environments-emphasizing thermal efficiency, assembly robustness, and DC precision over transient-only protection.
FAQ
What is the Zener voltage tolerance for 1PMT5945BE3/TR13?
The 1PMT5945BE3/TR13 has a standard Zener voltage tolerance of ±5% at 68 V, measured at IZT = 5.5 mA with TAB 1 held at 30°C. Tighter tolerances (±2%, ±1%) are available with suffixes C and D respectively, but the base part number 1PMT5945BE3/TR13 ships with ±5%.
How is thermal performance achieved in the 1PMT5945BE3/TR13 Powermite® package?
The 1PMT5945BE3/TR13 achieves 3.0 W power dissipation via its metallic TAB 1, which provides a 30°C/W junction-to-tab thermal path. When soldered to ≥1 square inch of 2 oz copper on the PCB, the device maintains safe junction temperatures without external heatsinks-unlike conventional SOD-123 or DO-214 packages.
Can 1PMT5945BE3/TR13 be used in place of a through-hole Zener like 1N5365B?
The 1PMT5945BE3/TR13 is not a drop-in replacement for 1N5365B due to different package (DO-216 vs. DO-201AD), polarity marking (TAB 1 cathode vs. band), and thermal behavior (30°C/W vs. 60°C/W). While both are 68 V/3 W Zeners, PCB layout and thermal design must be re-validated for 1PMT5945BE3/TR13.
What is the maximum reverse leakage current for 1PMT5945BE3/TR13 at 51.2 V?
The maximum reverse leakage current (IR) for 1PMT5945BE3/TR13 is 1700 µA at VR = 51.2 V, tested at TL = 30°C. This value ensures minimal loading in high-impedance reference or bias networks, supporting accurate voltage division and low-quiescent-current operation.
Is 1PMT5945BE3/TR13 compatible with lead-free reflow profiles?
Yes, the 1PMT5945BE3/TR13 Powermite® package is qualified for standard lead-free reflow profiles (JEDEC J-STD-020), including peak temperatures up to 260°C. Its molded construction and metallic bottom withstand thermal cycling without delamination or solder joint integrity loss.
1PMT5945BE3/TR13 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/TR13 FAQ
1.How can I place an order for 1PMT5945BE3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1PMT5945BE3/TR13 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/TR13 reliable?
The price and inventory of 1PMT5945BE3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1PMT5945BE3/TR13 is usually 5 days.
3.What payment methods are accepted for 1PMT5945BE3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1PMT5945BE3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1PMT5945BE3/TR13?
1PMT5945BE3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1PMT5945BE3/TR13 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/TR13?
For technical support, including 1PMT5945BE3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1PMT5945BE3/TR13 requirements.
6.How does Aetrix verify that 1PMT5945BE3/TR13 is sourced from the original manufacturer or authorized distributors?
All 1PMT5945BE3/TR13 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/TR13 meets industry standards.
7.What is the process for return or replacement of 1PMT5945BE3/TR13?
All 1PMT5945BE3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with 1PMT5945BE3/TR13, 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/TR13 part is unused and in its original packaging.
Return procedure for 1PMT5945BE3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1PMT5945BE3/TR13 Tags
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