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Microchip Technology 1PMT5942A/TR7
- Part No.:
- 1PMT5942A/TR7
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-216AA
- Datasheet:
-
1PMT5942A/TR7.pdf
- Description:
- DIODE ZENER 51V 3W DO216AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,297
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Product details
Overview
1PMT5942A/TR7 from Microsemi is a 51 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 70 Ω dynamic impedance at 7.3 mA test current and 1100 µA max reverse leakage at 38.8 V. It serves as a precision voltage reference or overvoltage clamp in DC power rails and regulator feedback paths.
For engineers reviewing the 1PMT5942A/TR7 datasheet, 1PMT5942A/TR7 pinout, 1PMT5942A/TR7 application, or 1PMT5942A/TR7 equivalent, key selection criteria include its 51 V nominal Zener voltage, 3.0 W thermal capability with metallic-tab heat sinking, low knee impedance (≤400 Ω), ESD rating >16 kV HBM, and DO-216 mechanical outline compatibility with automated SMT placement.
Technical Context
This Zener diode operates in reverse breakdown mode with tightly controlled voltage regulation across its specified test current range (IZT = 7.3 mA). Its Powermite® package integrates a full metallic bottom and locking tab to enhance thermal conduction from junction to PCB pad, enabling stable 3.0 W power handling without external heatsinking.
The device exhibits low reverse leakage (≤1100 µA at VR = 38.8 V) and a well-defined knee region (IZK = 0.25 mA, ZZK ≤ 400 Ω), supporting reliable low-current regulation in standby or sensing circuits. Zener voltage tolerance is ±5% standard, with optional 2% (suffix C) and 1% (suffix D) variants available.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 51 V ±5% at IZT = 7.3 mA - defines regulated output voltage in shunt regulator or reference applications |
| Power Dissipation | 3.0 W at TAB 1 = 60°C - enables high-power clamping without forced airflow or external heatsink |
| Dynamic Impedance (ZZT) | 70 Ω at IZT = 7.3 mA - ensures minimal output voltage variation under load current changes |
| Knee Impedance (ZZK) | ≤400 Ω at IZK = 0.25 mA - supports stable regulation even near minimum operating current |
| Reverse Leakage (IR) | ≤1100 µA at VR = 38.8 V - limits quiescent power loss in high-impedance bias networks |
| ESD Rating | >16 kV per Human Body Model - provides robust handling during automated assembly and board-level integration |
| Thermal Resistance | 30°C/W junction-to-TAB1 - quantifies thermal path efficiency for PCB copper area design |
Pinout & Package
Package: Powermite® (DO-216AA), molded surface-mount package with full metallic bottom and integral locking tab acting as thermal interface. Cathode designated by TAB 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TAB 1 | Cathode | Primary heat-sinking terminal; must be soldered to copper pour for thermal performance |
| Lead 2 | Anode | Standard anode connection; electrically isolated from TAB 1 in mounting position |
Key Features
| Feature | Design Value |
|---|---|
| Surface-mount Powermite® package | Enables automated SMT placement while delivering 3.0 W power handling comparable to through-hole DO-41 devices |
| Full metallic bottom | Eliminates solder flux entrapment risk and improves thermal transfer to PCB ground plane |
| Integral locking tab | Acts as built-in heat sink and mechanical anchor, reducing thermal resistance to 30°C/W |
| ESD robustness | >16 kV HBM rating ensures reliability during handling and reflow without additional protection circuitry |
| Tight voltage tolerance options | ±5% standard; ±2% (C suffix) and ±1% (D suffix) available for precision reference designs |
Applications
| DC Power Rail Clamping | Feedback Reference in SMPS |
|---|---|
Use Scenario: Protecting 48 V industrial control inputs against transient overvoltage events up to ±1 kV. IC Role / Device Role / Timing Role: Shunt clamping element absorbing surge energy while holding rail voltage ≤51 V. Use Value: 3.0 W power rating and 30°C/W thermal resistance allow sustained clamping without thermal runaway on standard 1 oz copper. | Use Scenario: Providing stable 51 V reference for optocoupler-based feedback in isolated 48 V output flyback converters. IC Role / Device Role / Timing Role: Precision Zener reference setting secondary-side regulation threshold. Use Value: ±5% VZ tolerance and 70 Ω dynamic impedance ensure <±0.5 V output regulation error across line/load variations. |
| Low-Power Sensor Biasing | Overvoltage Protection in Telecom Line Cards |
Use Scenario: Generating stable 51 V bias for avalanche photodiode (APD) bias networks in optical receivers. IC Role / Device Role / Timing Role: Low-noise, low-leakage voltage reference supplying constant reverse bias. Use Value: ≤1100 µA IR at 38.8 V and ≤400 Ω knee impedance enable stable APD gain control down to 0.25 mA operating current. | Use Scenario: Safeguarding Ethernet PHY interfaces on line cards exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Primary shunt protector clamping common-mode transients before TVS diodes engage. Use Value: >16 kV HBM ESD rating and DO-216 footprint support direct placement at connector entry points without layout derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMF51A (ON Semiconductor) | DO-219AB package, 3.0 W, 51 V ±5%, 70 Ω ZZT, but no metallic tab - higher θJA (125°C/W vs 30°C/W) | Limited to lower-duty-cycle clamping due to inferior thermal conduction | Select when board space is constrained and thermal load is intermittent |
| BZX84-C51 (Diodes Inc.) | SOT-23 package, 300 mW, 51 V ±5%, 100 Ω ZZT - 10× lower power rating and no integrated heat sink | Only suitable for signal-level referencing, not power rail clamping | Select only for low-current bias or sensing where 3.0 W capability is unnecessary |
Compared with SMF51A and BZX84-C51, the 1PMT5942A/TR7 delivers uniquely high thermal performance via its metallic-tab Powermite® construction, enabling continuous 3.0 W operation in compact SMT form - critical for industrial power conditioning where thermal margin and surge endurance are non-negotiable.
Availability
1PMT5942A/TR7 is available at Aetrix Electronics and suitable for industrial power supplies, telecom line protection, sensor biasing, and automotive body electronics requiring stable component supply and long-term lifecycle continuity.
Supply support for 1PMT5942A/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 diode family was designed to deliver through-hole-level power handling in surface-mount form factors, targeting applications where thermal performance, ESD robustness, and automated assembly compatibility are essential.
FAQ
What is the Zener voltage tolerance for 1PMT5942A/TR7?
The 1PMT5942A/TR7 has a standard Zener voltage tolerance of ±5% at 51 V, measured at IZT = 7.3 mA and TAB 1 temperature of 30°C. Tighter tolerances of ±2% (suffix C) and ±1% (suffix D) are available upon request, but the base 1PMT5942A/TR7 part uses the ±5% specification as defined in MSC0995 Rev F.
How is thermal performance achieved in the 1PMT5942A/TR7 Powermite® package?
The 1PMT5942A/TR7 achieves 30°C/W junction-to-TAB1 thermal resistance via its full metallic bottom and integral locking tab, which acts as a direct thermal interface to the PCB copper pour. This design eliminates flux entrapment and maximizes heat conduction - unlike plastic-bodied SMT Zeners - allowing sustained 3.0 W operation without external heatsinking.
Can the 1PMT5942A/TR7 be used in place of through-hole Zener diodes like 1N5355B?
Yes, the 1PMT5942A/TR7 is a direct functional replacement for 1N5355B (51 V, 5 W) in many applications, though with 3.0 W power rating instead of 5 W. Its Powermite® package offers superior thermal coupling to PCBs versus axial leads, making it more efficient per watt. However, peak surge handling requires verification against specific transient waveforms.
What does the "/TR7" suffix indicate in 1PMT5942A/TR7?
The "/TR7" suffix denotes tape-and-reel packaging per EIA-481 standard, with 3,000 units per 7-inch reel. This format is optimized for high-speed pick-and-place equipment and ensures consistent orientation (cathode TAB 1 leading) during automated assembly - critical for process yield in volume manufacturing of the 1PMT5942A/TR7.
Is the 1PMT5942A/TR7 RoHS compliant and lead-free?
Yes, the 1PMT5942A/TR7 is RoHS compliant and lead-free, consistent with Microsemi's transition to green manufacturing processes prior to its acquisition by Microchip. The Powermite® package uses matte tin-plated terminals and halogen-free molding compound, meeting JEDEC J-STD-020 moisture sensitivity level 1 requirements.
1PMT5942A/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):
- 51 V
- Tolerance:
- ±10%
- Power - Max:
- 3 W
- Impedance (Max) (Zzt):
- 70 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 38.8 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
1PMT5942A/TR7 FAQ
1.How can I place an order for 1PMT5942A/TR7 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1PMT5942A/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 1PMT5942A/TR7 reliable?
The price and inventory of 1PMT5942A/TR7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1PMT5942A/TR7 is usually 5 days.
3.What payment methods are accepted for 1PMT5942A/TR7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1PMT5942A/TR7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1PMT5942A/TR7?
1PMT5942A/TR7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1PMT5942A/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 1PMT5942A/TR7?
For technical support, including 1PMT5942A/TR7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1PMT5942A/TR7 requirements.
6.How does Aetrix verify that 1PMT5942A/TR7 is sourced from the original manufacturer or authorized distributors?
All 1PMT5942A/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 1PMT5942A/TR7 meets industry standards.
7.What is the process for return or replacement of 1PMT5942A/TR7?
All 1PMT5942A/TR7 units undergo pre-shipment inspection (PSI). If there is an issue with 1PMT5942A/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 1PMT5942A/TR7 part is unused and in its original packaging.
Return procedure for 1PMT5942A/TR7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1PMT5942A/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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