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Microchip Technology 1PMT5945B/TR13
- Part No.:
- 1PMT5945B/TR13
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-216AA
- Datasheet:
-
1PMT5945B/TR13.pdf
- Description:
- DIODE ZENER 68V 3W DO216AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,998
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Product details
Overview
1PMT5945B/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 120 Ω dynamic impedance at 5.5 mA test current and 1700 µA max reverse leakage 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 1PMT5945B/TR13 datasheet, 1PMT5945B/TR13 pinout, 1PMT5945B/TR13 application, or 1PMT5945B/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 Zener diode operates in reverse breakdown mode with tightly controlled voltage regulation across its specified test current range (IZT = 5.5 mA). Its Powermite® package integrates a full metallic bottom and locking tab to enhance thermal conduction from junction to PCB pad, achieving 30°C/W junction-to-TAB thermal resistance.
The device exhibits low knee impedance (ZZK = 0.25 Ω) and maintains stable regulation under varying load conditions due to its defined Zener impedance profile (ZZT = 120 Ω at IZT), with reverse leakage strictly limited to ≤1700 µA at VR = 51.2 V - ensuring minimal standby power loss in clamping applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 68 V ±5% at IZT = 5.5 mA - defines regulated output voltage in shunt reference or clamp circuits |
| Power Dissipation | 3.0 W at TAB 1 = 60°C - enables high-energy transient suppression without external heatsink |
| Dynamic Impedance | 120 Ω at IZT - determines voltage deviation under load current changes |
| Reverse Leakage | ≤1700 µA at VR = 51.2 V - ensures low quiescent current in standby protection circuits |
| Thermal Resistance | 30°C/W junction-to-TAB - supports reliable operation up to +150°C junction temperature |
| ESD Rating | >16 kV per Human Body Model - provides robust handling in automated assembly environments |
| Package Outline | DO-216 - standardized surface-mount footprint compatible with IPC-7351 guidelines |
Pinout & Package
1PMT5945B/TR13 uses the Powermite® surface-mount package (mechanically equivalent to DO-216), featuring a molded body with full metallic bottom and integral heat-sink locking tab. Cathode is designated by TAB 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TAB 1 | Cathode | Primary heat path and electrical cathode connection; must be soldered to copper pour for thermal management |
| Lead 2 | Anode | Standard anode terminal; connects to ground or lower-potential node in shunt configuration |
Key Features
| Feature | Design Value |
|---|---|
| Full metallic bottom | Eliminates solder flux entrapment during reflow, improving long-term reliability of solder joints |
| Integral heat-sink locking tab | Provides mechanical retention and direct thermal path from junction to PCB, enabling 3.0 W operation |
| Automated insertion compatibility | Designed for pick-and-place systems per EIA-481 tape-and-reel standard (7″/13″ reels) |
| Low reverse leakage | ≤1700 µA at 51.2 V ensures minimal power loss in always-on protection circuits |
Applications
| DC Power Rail Clamping | Shunt Voltage Reference |
|---|---|
Use Scenario: Protecting 48 V telecom line cards from surge-induced overvoltage events. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to clamp transient spikes above 68 V. Use Value: 3.0 W power handling absorbs 10/1000 µs surges without degradation; metallic tab ensures thermal stability during repeated events. | Use Scenario: Providing stable 68 V reference for isolated DC-DC converter feedback networks. IC Role / Device Role / Timing Role: Precision shunt reference maintaining regulation within ±5% across temperature and current variation. Use Value: 120 Ω dynamic impedance minimizes output voltage drift under load changes; low leakage preserves accuracy in high-impedance divider networks. |
| Industrial Sensor Excitation | Programmable Logic Controller Input Protection |
Use Scenario: Supplying regulated excitation voltage to strain-gauge bridges in harsh factory environments. IC Role / Device Role / Timing Role: Zener-based voltage source delivering stable bias to analog sensor elements. Use Value: 30°C/W thermal resistance allows operation at +85°C ambient without derating; DO-216 footprint fits compact sensor modules. | Use Scenario: Safeguarding digital input pins on PLC backplanes against field-wiring transients. IC Role / Device Role / Timing Role: Overvoltage clamp limiting input voltage to safe levels during ESD or inductive switching events. Use Value: >16 kV HBM ESD rating withstands handling and field surges; 68 V clamping threshold aligns with 24 V industrial logic thresholds. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5357B | Same 68 V nominal Zener voltage but in DO-204AL (DO-41) through-hole package; 5 W rating; no metallic tab | Requires through-hole assembly and external heatsinking for equivalent power handling | Select when legacy through-hole design or higher single-pulse energy absorption is required |
| BZX84-C68 | 68 V Zener in SOT-23; 300 mW rating; 40 Ω dynamic impedance; no metallic thermal path | Limited to low-power signal-level clamping; unsuitable for 3 W continuous dissipation | Select only for space-constrained, low-power bias/reference use - not for power rail protection |
Compared with 1PMT5945B/TR13, 1N5357B offers higher pulse energy capacity but lacks surface-mount compatibility and integrated thermal management, while BZX84-C68 provides compact size at the cost of 10× lower power rating and inferior thermal performance - making 1PMT5945B/TR13 the optimal choice for automated, high-reliability 3 W SMT Zener applications.
Availability
1PMT5945B/TR13 is available at Aetrix Electronics and suitable for DC power rail clamping, shunt voltage reference, and industrial sensor excitation requiring stable component supply and consistent Zener voltage tolerance.
Supply support for 1PMT5945B/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 surface-mount power regulation and transient protection where thermal performance, automated assembly compatibility, and mechanical robustness are critical - particularly in telecom infrastructure and industrial control systems.
FAQ
What is the Zener voltage tolerance for 1PMT5945B/TR13?
The 1PMT5945B/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% and ±1%) are available with suffixes C and D respectively, but the base part number 1PMT5945B/TR13 specifies ±5%. This tolerance directly impacts regulation accuracy in reference and clamp circuits.
How is thermal management achieved in the 1PMT5945B/TR13 package?
The 1PMT5945B/TR13 uses the Powermite® package with a full metallic bottom and integral locking tab that serves as both mechanical anchor and primary thermal path. Its specified junction-to-TAB thermal resistance is 30°C/W, enabling 3.0 W power dissipation when TAB 1 is maintained at ≤60°C - requiring direct solder connection to a thermally robust PCB copper area.
Is 1PMT5945B/TR13 compatible with standard SMT assembly processes?
Yes, the 1PMT5945B/TR13 is fully compatible with automated surface-mount assembly. It is supplied in EIA-481 compliant tape-and-reel format (7″ or 13″ reels), and its DO-216 outline meets IPC-7351 standards. The full metallic bottom prevents flux entrapment during reflow, and the locking tab ensures positional stability during placement and soldering.
What is the maximum reverse leakage current for 1PMT5945B/TR13?
The maximum reverse leakage current for 1PMT5945B/TR13 is 1700 µA at VR = 51.2 V, measured at TL = 30°C. This value is critical for low-power applications such as sensor biasing or high-impedance reference dividers, where excessive leakage would introduce error or increase standby power consumption.
Does 1PMT5945B/TR13 have ESD protection built-in?
Yes, the 1PMT5945B/TR13 is rated for >16 kV per Human Body Model (HBM) ESD, verified per ANSI/ESDA/JEDEC JS-001. This high ESD rating ensures robust handling during automated manufacturing and field deployment, reducing risk of latent damage in industrial and telecom environments where static discharge is common.
1PMT5945B/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
1PMT5945B/TR13 FAQ
1.How can I place an order for 1PMT5945B/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1PMT5945B/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 1PMT5945B/TR13 reliable?
The price and inventory of 1PMT5945B/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1PMT5945B/TR13 is usually 5 days.
3.What payment methods are accepted for 1PMT5945B/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1PMT5945B/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1PMT5945B/TR13?
1PMT5945B/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1PMT5945B/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 1PMT5945B/TR13?
For technical support, including 1PMT5945B/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1PMT5945B/TR13 requirements.
6.How does Aetrix verify that 1PMT5945B/TR13 is sourced from the original manufacturer or authorized distributors?
All 1PMT5945B/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 1PMT5945B/TR13 meets industry standards.
7.What is the process for return or replacement of 1PMT5945B/TR13?
All 1PMT5945B/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with 1PMT5945B/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 1PMT5945B/TR13 part is unused and in its original packaging.
Return procedure for 1PMT5945B/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1PMT5945B/TR13 Tags
-
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
onsemi
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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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