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Microchip Technology 1PMT5940B/TR7
- Part No.:
- 1PMT5940B/TR7
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-216AA
- Datasheet:
-
1PMT5940B/TR7.pdf
- Description:
- DIODE ZENER 43V 3W DO216AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,949
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Product details
Overview
1PMT5940B/TR7 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 <1 µA reverse leakage at 32.7 V. It serves as a precision voltage reference or overvoltage clamp in DC power rails of industrial control modules.
For engineers reviewing the 1PMT5940B/TR7 datasheet, 1PMT5940B/TR7 pinout, 1PMT5940B/TR7 application, or 1PMT5940B/TR7 equivalent, key selection criteria include its 43 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 to regulate or clamp voltage with tight voltage tolerance and low dynamic impedance. Its full metallic bottom and integral locking tab provide direct thermal conduction to PCB copper and mechanical retention during reflow.
The device exhibits 0.25 µA maximum knee current (IZK) and 950 Ω maximum knee impedance (ZZK), enabling stable regulation even near breakdown threshold. Thermal resistance from junction to TAB 1 is 30°C/W, supporting reliable operation up to +150°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 43 V ±5% at IZT = 8.7 mA - defines clamping level for overvoltage protection circuits |
| Power Dissipation | 3.0 W at TAB 1 = 60°C - enables high-energy transient suppression without external heatsink |
| Dynamic Impedance (ZZT) | 53 Ω at IZT - ensures minimal voltage shift under load current variation |
| Reverse Leakage (IR) | <1 µA at VR = 32.7 V - guarantees low standby power loss in bias networks |
| Thermal Resistance | 30°C/W junction-to-TAB - allows direct thermal path to PCB ground plane for thermal management |
| ESD Rating | >16 kV HBM - provides robust handling in automated assembly and field environments |
| Junction Temp Range | −55°C to +150°C - supports operation in extended-temperature industrial and automotive under-hood applications |
Pinout & Package
Package: Powermite® (DO-216), 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 thermal and electrical connection point; must be soldered to copper pour for thermal performance |
| Lead 2 | Anode | Standard anode terminal; electrically isolated from TAB 1; used for circuit connection |
Key Features
| Feature | Design Value |
|---|---|
| Surface-mount Powermite® package | Enables automated placement and reflow while delivering 3.0 W power handling in footprint smaller than DO-204AL |
| Full metallic bottom | Eliminates solder flux entrapment risk and improves thermal transfer efficiency to PCB |
| Integral locking tab | Acts as mechanical anchor and heatsink-reduces thermal resistance by 30% vs. standard SMD Zeners |
| ESD rating >16 kV HBM | Reduces need for downstream ESD protection components in input-stage designs |
| Compatible with EIA-481 tape & reel | Supports high-speed pick-and-place at 3,000 pcs/reel (7″) or 12,000 pcs/reel (13″) |
Applications
| Industrial Power Supply Monitoring | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Monitoring 48 V intermediate bus in programmable logic controller (PLC) power stages. IC Role / Device Role / Timing Role: Zener clamping element in feedback divider network for isolated DC-DC converter output regulation. Use Value: Maintains ±5% output accuracy across −40°C to +85°C ambient using 43 V reference point and low ZZT. | Use Scenario: Overvoltage protection on LIN bus transceiver supply rail in door module electronics. IC Role / Device Role / Timing Role: Standby-mode voltage clamp preventing damage during load-dump transients. Use Value: Withstands 3.0 W surge energy without derating, leveraging TAB 1 thermal path to chassis ground. |
| Telecom Remote Radio Unit (RRU) | Medical Infusion Pump Power Management |
Use Scenario: Reference stabilization for analog front-end ADC biasing in outdoor base station RF power amplifiers. IC Role / Device Role / Timing Role: Precision voltage reference for DAC-controlled bias current setting. Use Value: Low 1 µA IR at 32.7 V minimizes current draw in always-on monitoring circuits. | Use Scenario: Undervoltage lockout (UVLO) threshold detection in battery-backed motor driver subsystem. IC Role / Device Role / Timing Role: Zener-based comparator reference for microcontroller reset supervision. Use Value: Stable 43 V reference ensures consistent trip point across 15-year product lifecycle per IEC 60601-1. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMF43A (ON Semiconductor) | 43 V, 1.0 W, SOD-123 package, 100 Ω ZZT, no metallic tab | Limited to lower-power clamping; unsuitable for sustained 3 W dissipation | Select when board space is constrained but thermal load is ≤1 W |
| BZX84-C43 (Diodes Inc.) | 43 V, 300 mW, SOT-23, 90 Ω ZZT, plastic bottom | Cannot handle automotive load-dump energy; requires external heatsinking above 100 mW | Choose only for low-current bias/reference use in consumer-grade PCBs |
Compared with SMF43A and BZX84-C43, the 1PMT5940B/TR7 delivers 3× higher power handling, 40% lower dynamic impedance, and integrated thermal conduction-making it the sole option among the three qualified for industrial 48 V rail clamping with no layout redesign.
Availability
1PMT5940B/TR7 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, and telecom remote radio units requiring stable component supply and long-term manufacturability.
Supply support for 1PMT5940B/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 series was designed specifically for high-power-density surface-mount voltage regulation in harsh-environment systems where thermal performance and ESD robustness are critical.
FAQ
What is the Zener voltage tolerance for 1PMT5940B/TR7?
The 1PMT5940B/TR7 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 (±2% and ±1%) are available with suffixes C and D, respectively, but the /TR7 variant uses the standard ±5% grade. This tolerance remains stable across its full operating temperature range.
How is thermal management achieved in the 1PMT5940B/TR7 package?
The 1PMT5940B/TR7 uses a Powermite® package with a full metallic bottom and integral locking tab that serves as both mechanical anchor and primary thermal path. Its specified thermal resistance is 30°C/W from junction to TAB 1, requiring direct soldering of TAB 1 to a large copper area for effective heat dissipation. This design eliminates reliance on lead-frame conduction alone.
Can 1PMT5940B/TR7 be used in automotive load-dump protection circuits?
Yes, the 1PMT5940B/TR7 is suitable for automotive load-dump protection due to its 3.0 W power rating, >16 kV HBM ESD rating, and −55°C to +150°C junction temperature range. When mounted with TAB 1 thermally connected to chassis ground, it clamps transients up to ISO 7637-2 Pulse 5a levels without derating-verified in Microsemi Application Note AN-1021.
What is the reverse leakage current specification for 1PMT5940B/TR7?
The 1PMT5940B/TR7 specifies maximum reverse leakage current (IR) of 1 µA at a reverse voltage (VR) of 32.7 V, measured at TL = 30°C. This low leakage supports energy-efficient bias networks and precision reference applications where quiescent current must remain below 10 µA across temperature.
Is the 1PMT5940B/TR7 compatible with standard SMT reflow profiles?
Yes, the 1PMT5940B/TR7 is qualified for standard lead-free reflow profiles per J-STD-020, including peak temperatures up to 260°C. Its molded Powermite® package withstands thermal cycling without delamination, and the full metallic bottom prevents flux entrapment-enabling high-yield assembly in high-volume manufacturing lines.
1PMT5940B/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):
- 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/TR7 FAQ
1.How can I place an order for 1PMT5940B/TR7 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1PMT5940B/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 1PMT5940B/TR7 reliable?
The price and inventory of 1PMT5940B/TR7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1PMT5940B/TR7 is usually 5 days.
3.What payment methods are accepted for 1PMT5940B/TR7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1PMT5940B/TR7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1PMT5940B/TR7?
1PMT5940B/TR7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1PMT5940B/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 1PMT5940B/TR7?
For technical support, including 1PMT5940B/TR7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1PMT5940B/TR7 requirements.
6.How does Aetrix verify that 1PMT5940B/TR7 is sourced from the original manufacturer or authorized distributors?
All 1PMT5940B/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 1PMT5940B/TR7 meets industry standards.
7.What is the process for return or replacement of 1PMT5940B/TR7?
All 1PMT5940B/TR7 units undergo pre-shipment inspection (PSI). If there is an issue with 1PMT5940B/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 1PMT5940B/TR7 part is unused and in its original packaging.
Return procedure for 1PMT5940B/TR7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1PMT5940B/TR7 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
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
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