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Microchip Technology 1PMT5940B/TR13
- Part No.:
- 1PMT5940B/TR13
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-216AA
- Datasheet:
-
1PMT5940B/TR13.pdf
- Description:
- DIODE ZENER 43V 3W DO216AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,483
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Product details
Overview
1PMT5940B/TR13 from Microsemi is a 43 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 53 Ω dynamic impedance at 8.7 mA test current and 950 µA max reverse leakage at 32.7 V. It serves as a precision voltage reference or overvoltage clamp in DC power rails and regulator feedback paths.
For engineers reviewing the 1PMT5940B/TR13 datasheet, 1PMT5940B/TR13 pinout, 1PMT5940B/TR13 application, or 1PMT5940B/TR13 equivalent, key selection criteria include zener voltage accuracy, thermal resistance (30°C/W junction-to-TAB), ESD rating (>16 kV HBM), low knee impedance (≤950 Ω), and compatibility with automated SMT assembly using EIA-481 tape-and-reel packaging.
Technical Context
This device operates as a two-terminal voltage-regulating diode with sharp breakdown characteristics, designed for stable DC voltage reference and transient suppression in space-constrained PCB layouts. Its Powermite® package integrates a full metallic bottom and locking tab to enhance thermal conduction and mechanical retention during reflow.
The 1PMT5940B/TR13 exhibits a nominal zener voltage of 43 V measured at 8.7 mA (IZT), with 53 Ω dynamic impedance (ZZT) and 950 µA maximum reverse leakage (IR) at 32.7 V (VR). Junction temperature range is –55°C to +150°C, and thermal resistance from junction to TAB 1 is 30°C/W.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 43 V ±5% at IZT = 8.7 mA - defines stable regulation point under nominal bias |
| Power Dissipation | 3.0 W at TAB 1 = 60°C - sets maximum continuous DC power handling with heatsinking via TAB |
| Dynamic Impedance (ZZT) | 53 Ω at IZT - determines output voltage stability under small-signal current variation |
| Reverse Leakage (IR) | ≤950 µA at VR = 32.7 V - ensures low quiescent current in standby clamp configurations |
| Thermal Resistance | 30°C/W junction-to-TAB 1 - enables thermal design using TAB as primary heat path to PCB copper |
| ESD Rating | >16 kV per HBM - provides robustness against handling-induced electrostatic discharge |
| Knee Current (IZK) | 0.25 mA - specifies minimum current for usable regulation onset near breakdown threshold |
Pinout & Package
Package: Powermite® surface-mount molded package with full metallic bottom and integral locking tab; cathode designated by TAB 1; weight ≈ 0.016 g; mounting position unrestricted.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TAB 1 | Cathode | Primary heat sink terminal and electrical cathode connection; must be soldered to thermal pad for rated 3.0 W operation |
| Lead 2 | Anode | Standard anode terminal; electrically isolated from TAB; used for series connection into regulated node |
Key Features
| Feature | Design Value |
|---|---|
| Surface-mount Powermite® package | Enables high-density PCB layout while delivering 3.0 W power handling comparable to larger through-hole Zeners |
| Full metallic bottom | Eliminates solder flux entrapment during reflow, improving long-term reliability and void-free solder joints |
| Integral locking tab | Acts as mechanical anchor and thermal path-reduces thermal resistance to 30°C/W and prevents tombstoning |
| EIA-481 tape-and-reel packaging | Supports direct feeding into automated pick-and-place equipment without manual handling or orientation issues |
| ±5% zener voltage tolerance | Meets standard industrial reference accuracy; tighter 2% (suffix C) and 1% (suffix D) options available for precision designs |
Applications
| DC Power Rail Clamping | Feedback Reference in Switchers |
|---|---|
Use Scenario: Protecting 36–48 V DC input stages from surge transients in industrial PLC I/O modules. IC Role / Device Role / Timing Role: Two-terminal shunt regulator clamping voltage to 43 V to prevent downstream IC damage. Use Value: 3.0 W power rating allows sustained clamping during 100 ms surges; 950 µA IR minimizes standby loss. | Use Scenario: Providing precise 43 V reference for optocoupler feedback in isolated 48 V → 12 V flyback converters. IC Role / Device Role / Timing Role: Zener-based voltage reference setting error amplifier trip point in secondary-side regulation loop. Use Value: 53 Ω ZZT ensures minimal output voltage drift across load steps; ±5% tolerance aligns with typical SMPS accuracy requirements. |
| Overvoltage Protection in Telecom | Programmable Threshold Detection |
Use Scenario: Safeguarding Ethernet PHY interfaces powered from 48 V PoE midspan supplies against line faults. IC Role / Device Role / Timing Role: Shunt limiter activated when input exceeds 43 V, diverting excess current to ground via TAB 1. Use Value: >16 kV HBM ESD rating protects during board handling; metallic bottom ensures reliable thermal coupling to chassis ground plane. | Use Scenario: Setting trigger threshold for comparator-based brown-out detection in battery-powered edge sensors. IC Role / Device Role / Timing Role: Voltage reference input to comparator that asserts reset when supply drops below 43 V × 0.95 = 40.85 V. Use Value: Low 0.25 mA IZK enables stable threshold generation even at microamp-level bias currents. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5365B | Same 43 V nominal, but DO-41 package (axial lead); 5 W rating; higher thermal resistance (~65°C/W) | Requires through-hole mounting and larger board area; better suited for prototyping or low-volume manual assembly | Select 1N5365B only if board lacks SMT capability or requires higher peak pulse power beyond 3.0 W DC |
| BZX84-C43 | SOT-23 package; 43 V ±5%; 300 mW rating; 90 Ω ZZT; no metallic thermal tab | Limited to low-power signal-level references; unsuitable for rail clamping above ~100 mA | Choose BZX84-C43 only for space-constrained logic-level biasing where thermal load is negligible |
Compared with 1N5365B and BZX84-C43, the 1PMT5940B/TR13 uniquely balances 3.0 W SMT power handling, 30°C/W thermal resistance via TAB 1, and EIA-481 automation readiness-making it optimal for production-grade 43 V clamping in industrial and telecom power systems.
Availability
1PMT5940B/TR13 is available at Aetrix Electronics and suitable for industrial power supplies, telecom rectifier modules, and automotive body control units requiring stable component supply with full traceability and long-lifecycle support.
Supply support for 1PMT5940B/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 semiconductor company specializing in high-reliability analog, mixed-signal, and radiation-hardened components for aerospace, defense, and industrial markets.
The Powermite® Zener family-including 1PMT5940B/TR13-is engineered for high-power density surface-mount voltage regulation in harsh-environment power systems where thermal performance and assembly robustness are critical.
FAQ
What is the zener voltage tolerance for 1PMT5940B/TR13?
The 1PMT5940B/TR13 has a standard zener voltage tolerance of ±5% at 43 V, measured at 8.7 mA test current with TAB 1 held at 30°C. Tighter tolerances of ±2% (suffix C) and ±1% (suffix D) are available upon request, but the base 1PMT5940B/TR13 shipped by Aetrix Electronics carries the ±5% specification as defined in the MSC0995 datasheet revision F.
How is thermal management handled for 1PMT5940B/TR13 in high-power operation?
Thermal management for 1PMT5940B/TR13 relies on TAB 1 as the primary heat conduction path: its 30°C/W junction-to-TAB thermal resistance requires direct soldering to a thermally robust PCB copper area. The full metallic bottom eliminates flux voids, and the locking tab enhances mechanical and thermal contact. At 60°C TAB temperature, the device sustains 3.0 W DC dissipation-exceeding this requires derating per the datasheet's thermal curve.
Is 1PMT5940B/TR13 compatible with lead-free reflow processes?
Yes, 1PMT5940B/TR13 is qualified for lead-free reflow per J-STD-020. Its Powermite® package withstands peak temperatures up to 260°C for 20–40 seconds. The full metallic bottom improves thermal uniformity during ramp-up, reducing risk of delamination or solder joint fracture. Aetrix Electronics confirms full compliance with IPC-A-610 Class 2/3 process requirements for this device.
What does the "TR13" suffix indicate in 1PMT5940B/TR13?
The "TR13" suffix in 1PMT5940B/TR13 denotes EIA-481 tape-and-reel packaging on a 13-inch reel containing 12,000 units. This format is optimized for high-speed automated placement equipment. It does not affect electrical specifications-the 1PMT5940B/TR13 shares identical zener voltage, impedance, and thermal characteristics with the same-base-number device in other packaging formats.
Can 1PMT5940B/TR13 be used as a replacement for older through-hole Zeners like 1N5365B?
1PMT5940B/TR13 is not a drop-in replacement for 1N5365B due to different package (Powermite® vs. DO-41), pinout, and thermal interface. While both regulate at 43 V, the 1PMT5940B/TR13 requires SMT layout with thermal pad for TAB 1, whereas 1N5365B uses axial leads. Electrical substitution is feasible only after redesigning the footprint and verifying thermal performance under actual load conditions.
1PMT5940B/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):
- 43 V
- Tolerance:
- ±5%
- Power - Max:
- 3 W
- Impedance (Max) (Zzt):
- 53 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 32.7 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
1PMT5940B/TR13 FAQ
1.How can I place an order for 1PMT5940B/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1PMT5940B/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 1PMT5940B/TR13 reliable?
The price and inventory of 1PMT5940B/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1PMT5940B/TR13 is usually 5 days.
3.What payment methods are accepted for 1PMT5940B/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1PMT5940B/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1PMT5940B/TR13?
1PMT5940B/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1PMT5940B/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 1PMT5940B/TR13?
For technical support, including 1PMT5940B/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1PMT5940B/TR13 requirements.
6.How does Aetrix verify that 1PMT5940B/TR13 is sourced from the original manufacturer or authorized distributors?
All 1PMT5940B/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 1PMT5940B/TR13 meets industry standards.
7.What is the process for return or replacement of 1PMT5940B/TR13?
All 1PMT5940B/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with 1PMT5940B/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 1PMT5940B/TR13 part is unused and in its original packaging.
Return procedure for 1PMT5940B/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1PMT5940B/TR13 Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
Micro Commercial Co
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BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
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