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Microchip Technology 1PMT5940C/TR7
- Part No.:
- 1PMT5940C/TR7
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-216AA
- Datasheet:
-
1PMT5940C/TR7.pdf
- Description:
- DIODE ZENER 43V 3W DO216AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,063
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Product details
Overview
1PMT5940C/TR7 from Microsemi is a 43 V, ±1% 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 thermal resistance of 30°C/W junction-to-TAB1 - used for precision voltage regulation in space-constrained industrial power supplies.
For engineers reviewing the 1PMT5940C/TR7 datasheet, 1PMT5940C/TR7 pinout, 1PMT5940C/TR7 application, or 1PMT5940C/TR7 equivalent, key selection criteria include tight voltage tolerance (±1%), low knee impedance (950 Ω at 0.25 mA), ESD rating >16 kV HBM, and compatibility with automated insertion equipment using EIA-481 tape-and-reel packaging.
Technical Context
This Zener diode operates as a two-terminal voltage reference device with cathode designated by TAB 1, requiring no external biasing circuitry. Its full metallic bottom eliminates solder flux entrapment during reflow, and integral locking tabs provide mechanical retention and enhanced thermal conduction to the PCB.
The device delivers stable 43 V regulation across -55°C to +150°C junction temperature range, with reverse leakage limited to 1 µA max at 32.7 V and forward voltage of 1.2 V at 200 mA - enabling use in overvoltage protection and feedback-sensing circuits where thermal stability and low leakage are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage | 43 V ±1% at 8.7 mA - enables precise voltage clamping in feedback loops with minimal calibration drift |
| Power Dissipation | 3.0 W at TAB 1 = 60°C - supports high-energy transient suppression without derating in compact layouts |
| Dynamic Impedance | 53 Ω at IZT = 8.7 mA - ensures low output impedance for stable regulation under varying load conditions |
| Knee Impedance | 950 Ω at IZK = 0.25 mA - maintains usable regulation down to microamp-level standby currents |
| Thermal Resistance | 30°C/W junction-to-TAB1 - allows direct thermal path to copper pour or heatsink pad for reliable high-temp operation |
| ESD Rating | >16 kV per HBM - provides robust handling margin during SMT assembly and field operation |
| Reverse Leakage | ≤1 µA at VR = 32.7 V - minimizes quiescent current loss in battery-backed or low-power monitoring circuits |
Pinout & Package
Package: Powermite® surface-mount molded package with full metallic bottom and integral heat-sink locking tabs; cathode identified by TAB 1; weight ≈ 0.016 g; DO-216 outline compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TAB 1 | Cathode | Primary heat-sinking terminal and voltage reference node; must be connected to ground or low-impedance return path |
| Lead 2 | Anode | Current entry point during reverse-bias regulation; routed to unregulated input or transient source |
Key Features
| Feature | Design Value |
|---|---|
| Surface-mount Powermite® package | Enables automated placement and reflow while delivering 3 W power handling in footprint smaller than DO-41 |
| Integral heat-sink locking tabs | Provides mechanical anchoring during thermal cycling and reduces thermal resistance by direct metal-to-PCB contact |
| Full metallic bottom | Eliminates solder flux entrapment risk - improves long-term reliability in high-humidity or corrosive environments |
| ±1% Zener voltage tolerance (suffix C) | Reduces need for post-assembly trimming in precision reference applications such as ADC voltage references or sensor excitation |
| ESD rating >16 kV HBM | Supports handling without special ESD controls - lowers manufacturing cost and field failure rate in consumer/industrial end-equipment |
Applications
| Industrial Power Supply Regulation | Automotive ECUs |
|---|---|
Use Scenario: Stabilizing feedback voltage in isolated flyback converters for PLC I/O modules. IC Role / Device Role / Timing Role: Zener reference diode providing 43 V clamp for optocoupler-based primary-side regulation. Use Value: Tight ±1% tolerance ensures consistent output voltage across temperature and line variations without secondary-side sensing. | Use Scenario: Overvoltage protection on 12 V battery rail inputs in engine control units. IC Role / Device Role / Timing Role: Transient voltage suppressor clamping spikes above 43 V to protect downstream MCU and CAN transceivers. Use Value: 3.0 W rating absorbs ISO 7637-2 pulse 5a surges without degradation; metallic tab aids thermal dissipation in sealed enclosures. |
| Test & Measurement Equipment | Medical Diagnostic Sensors |
Use Scenario: Precision voltage reference for 16-bit DAC output buffers in portable calibrators. IC Role / Device Role / Timing Role: Low-leakage (≤1 µA) Zener establishing stable 43 V reference for analog front-end gain stages. Use Value: 950 Ω knee impedance ensures regulation remains active even at sub-mA standby currents during sleep mode. | Use Scenario: Biasing photodiode amplifiers in ultrasound beamforming ASICs. IC Role / Device Role / Timing Role: Low-noise voltage reference supplying bias to high-gain transimpedance amplifiers. Use Value: >16 kV HBM ESD rating prevents damage during manual probe handling and board-level ESD events in clinical settings. |
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 W, SOD-123 package, 100 Ω Zzt, ±5% tolerance | Lower power rating limits surge energy absorption; smaller footprint but no integral heat sink | Select when board space is constrained and peak power < 1 W; not suitable for 3 W continuous regulation |
| BZX84-C43 (Diodes Inc.) | 43 V, 300 mW, SOT-23 package, 90 Ω Zzt, ±5% tolerance | Not rated for automotive temperature range; lacks metallic thermal path and ESD robustness | Acceptable for low-cost consumer electronics where thermal and ESD margins are relaxed |
Compared with SMF43A and BZX84-C43, the 1PMT5940C/TR7 offers triple the power rating, superior thermal management via TAB 1, and certified >16 kV HBM ESD protection - making it the only option among the three qualified for industrial and automotive under-hood applications requiring sustained 3 W dissipation.
Availability
1PMT5940C/TR7 is available at Aetrix Electronics and suitable for industrial power supplies, automotive electronic control units, and medical diagnostic sensors requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for 1PMT5940C/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 and mixed-signal components for aerospace, defense, and industrial markets.
The Powermite® Zener diode product line was designed to deliver high-power surface-mount voltage regulation with integrated thermal management - targeting applications where legacy through-hole Zeners failed to meet size, thermal, or automation requirements.
FAQ
What is the Zener voltage tolerance for 1PMT5940C/TR7?
The "C" suffix in 1PMT5940C/TR7 denotes ±1% Zener voltage tolerance at 8.7 mA test current and TAB 1 temperature of 30°C. This tighter tolerance compared to standard ±5% versions (e.g., 1PMT5940B/TR7) reduces system-level calibration effort in precision voltage reference designs. The 1PMT5940C/TR7 achieves this via binning during final test and is documented in MSC0995 Rev F, Note 1.
How is thermal performance characterized for 1PMT5940C/TR7?
The 1PMT5940C/TR7 has a specified thermal resistance of 30°C/W from junction to TAB 1, measured under standard test conditions. This value assumes TAB 1 is soldered to a minimum 1-inch² copper area on the PCB. Actual thermal performance depends on PCB layout, airflow, and adjacent heat sources. The metallic bottom and locking tabs of the Powermite® package directly enable this low Rθj-tab rating, unlike plastic-only SMD packages.
Is 1PMT5940C/TR7 compatible with lead-free reflow processes?
Yes, the 1PMT5940C/TR7 is qualified for lead-free reflow per JEDEC J-STD-020. Its Powermite® package withstands peak temperatures up to 260°C for 30 seconds. The full metallic bottom improves thermal uniformity during ramp-up, reducing risk of delamination or voiding. Microsemi's MSC0995 datasheet confirms compliance with RoHS and lead-free assembly requirements.
What does the "TR7" suffix indicate in 1PMT5940C/TR7?
The "TR7" suffix indicates tape-and-reel packaging per EIA-481 standard, with 3,000 pieces per 7-inch reel. This format is optimized for high-speed pick-and-place machines and ensures consistent orientation (cathode TAB 1 facing defined direction) during automated assembly. The TR7 configuration is explicitly listed under Packaging in the MSC0995 datasheet.
Can 1PMT5940C/TR7 replace older through-hole Zeners like 1N5257B?
No - the 1PMT5940C/TR7 is not a drop-in replacement for 1N5257B due to different package (Powermite® vs. DO-35), thermal path (TAB 1 vs. axial leads), and mounting method (SMT vs. through-hole). While both regulate at ~43 V, the 1PMT5940C/TR7 requires PCB pad design per DO-216 dimensions and leverages its metallic tab for heat sinking. Direct substitution would require layout revision and thermal validation.
1PMT5940C/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:
- ±2%
- 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
1PMT5940C/TR7 FAQ
1.How can I place an order for 1PMT5940C/TR7 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1PMT5940C/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 1PMT5940C/TR7 reliable?
The price and inventory of 1PMT5940C/TR7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1PMT5940C/TR7 is usually 5 days.
3.What payment methods are accepted for 1PMT5940C/TR7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1PMT5940C/TR7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1PMT5940C/TR7?
1PMT5940C/TR7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1PMT5940C/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 1PMT5940C/TR7?
For technical support, including 1PMT5940C/TR7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1PMT5940C/TR7 requirements.
6.How does Aetrix verify that 1PMT5940C/TR7 is sourced from the original manufacturer or authorized distributors?
All 1PMT5940C/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 1PMT5940C/TR7 meets industry standards.
7.What is the process for return or replacement of 1PMT5940C/TR7?
All 1PMT5940C/TR7 units undergo pre-shipment inspection (PSI). If there is an issue with 1PMT5940C/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 1PMT5940C/TR7 part is unused and in its original packaging.
Return procedure for 1PMT5940C/TR7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1PMT5940C/TR7 Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
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
-
MMSZ5245BS-7-F
Diodes Incorporated
-
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
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SMAZ12-13-F
Diodes Incorporated
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