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Microchip Technology 1PMT5937C/TR7
- Part No.:
- 1PMT5937C/TR7
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-216AA
- Datasheet:
-
1PMT5937C/TR7.pdf
- Description:
- DIODE ZENER 33V 3W DO216AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,212
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Product details
Overview
1PMT5937C/TR7 from Microsemi is a 33 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 11.4 mA test current, 33 Ω dynamic impedance, and 800 µA max reverse leakage at 1.0 V. It serves as a precision voltage reference or overvoltage clamp in power supply regulation circuits.
For engineers reviewing the 1PMT5937C/TR7 datasheet, 1PMT5937C/TR7 pinout, 1PMT5937C/TR7 application, or 1PMT5937C/TR7 equivalent, key selection criteria include its tight 1% voltage tolerance, low 33 Ω Zener impedance at 11.4 mA, ESD rating >16 kV HBM, full metallic bottom for flux-free soldering, and thermal resistance of 30°C/W junction-to-TAB1.
Technical Context
This Zener diode operates in reverse breakdown mode with tightly controlled voltage regulation across its specified test current range. Its Powermite® package integrates a locking tab that functions as both mechanical anchor and thermal path to PCB copper, enabling efficient heat transfer from junction to TAB 1.
The device exhibits low knee impedance (≤33 Ω) and maintains stable regulation down to 0.25 mA knee current, supporting low-power biasing applications. Reverse leakage remains ≤800 µA at 1.0 V, ensuring minimal standby current draw in precision reference designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage | 33 V ±1% - enables precise voltage clamping or reference generation with minimal calibration overhead |
| Power Dissipation | 3.0 W at TAB 1 = 60°C - supports high-energy transient suppression without external heatsinking |
| Test Current | 11.4 mA - defines nominal operating point where voltage and impedance are specified |
| Dynamic Impedance | 33 Ω at 11.4 mA - ensures minimal output voltage variation under load current changes |
| Reverse Leakage | ≤800 µA at 1.0 V - guarantees low quiescent current in battery-powered or standby-critical systems |
| Thermal Resistance | 30°C/W junction-to-TAB1 - allows accurate thermal design when mounted on copper pour or thermal pad |
| ESD Rating | >16 kV HBM - provides robust handling during automated assembly and field operation |
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 thermal and electrical connection point; must be soldered to PCB copper for rated power and thermal performance |
| Lead 2 | Anode | Standard anode terminal; electrically isolated from TAB 1; used for circuit connection and mechanical anchoring |
Key Features
| Feature | Design Value |
|---|---|
| Full metallic bottom | Eliminates solder flux entrapment during reflow, improving long-term reliability and reducing post-assembly cleaning needs |
| Integral heat sink locking tab | Provides mechanical retention during automatic insertion and enhances thermal conduction from junction to PCB |
| ±1% Zener voltage tolerance | Reduces need for post-production trimming or binning in precision reference applications |
| ESD rating >16 kV HBM | Enables direct handling and placement without additional ESD protection circuitry in final assemblies |
| DO-216 compatible footprint | Ensures compatibility with standard SMT pick-and-place equipment and industry-standard land patterns |
Applications
| Industrial Power Supply Regulation | Automotive ECUs |
|---|---|
Use Scenario: Stabilizing feedback voltage in isolated DC-DC converters for programmable logic controllers. IC Role / Device Role / Timing Role: Precision shunt voltage reference for optocoupler-based feedback loop. Use Value: 1% tolerance and 33 Ω impedance maintain regulation accuracy within ±0.5% across line/load transients. | Use Scenario: Overvoltage protection on 12 V rail inputs to microcontroller power management ICs. IC Role / Device Role / Timing Role: Clamp diode limiting input voltage to safe levels during load dump events. Use Value: 3.0 W rating and 30°C/W thermal resistance allow sustained clamping without thermal runaway at 85°C ambient. |
| Medical Sensor Biasing | Telecom Line Card Protection |
Use Scenario: Providing stable bias voltage for analog front-end amplifiers in portable patient monitors. IC Role / Device Role / Timing Role: Low-noise, low-leakage voltage reference for ADC reference divider networks. Use Value: ≤800 µA reverse leakage at 1.0 V prevents signal drift in high-impedance sensor interfaces. | Use Scenario: Protecting Ethernet PHY interface pins from induced surges on PoE-enabled line cards. IC Role / Device Role / Timing Role: Secondary clamping element in multi-stage TVS architecture. Use Value: >16 kV HBM rating complements primary TVS devices, extending system-level ESD immunity beyond IEC 61000-4-2 Level 4. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4748A | 33 V ±5%, 1.0 W, DO-41 package, 44 Ω ZZT, no metallic bottom | Limited to lower-power, non-automated assembly contexts; lacks flux-free construction and thermal performance | Select when cost sensitivity outweighs thermal or ESD requirements and board space permits axial/through-hole mounting |
| BZX84-C33 | 33 V ±5%, 300 mW, SOT-23, 90 Ω ZZT, 100 nA IR @ 25 V | Optimized for ultra-low leakage and small size, not power handling; unsuitable for >300 mW continuous dissipation | Prefer for space-constrained, low-current biasing where leakage <100 nA is critical and power is <300 mW |
Compared with 1N4748A and BZX84-C33, the 1PMT5937C/TR7 delivers superior thermal management via its 3.0 W rating and 30°C/W junction-to-TAB1 path, tighter 1% voltage control, and integrated ESD robustness-making it uniquely suited for industrial and automotive applications demanding reliability under thermal and electrical stress.
Availability
1PMT5937C/TR7 is available at Aetrix Electronics and suitable for industrial power supply regulation, automotive ECU protection, and medical sensor biasing requiring stable component supply, consistent parametric performance, and traceable sourcing.
Supply support for 1PMT5937C/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 semiconductor company specializing in high-reliability analog, mixed-signal, and radiation-hardened components for aerospace, defense, and industrial markets.
The Powermite® Zener diode family-including the 1PMT5937C/TR7-is engineered for surface-mount power regulation and protection in thermally demanding environments where traditional through-hole or low-power SMT Zeners fall short.
FAQ
What is the Zener voltage tolerance for 1PMT5937C/TR7?
The "C" suffix in 1PMT5937C/TR7 denotes ±1% Zener voltage tolerance at 33 V, verified per Microsemi's characterization at IZT = 11.4 mA and TC = 30°C. This tighter tolerance reduces calibration effort in precision reference designs compared to standard ±5% variants like 1PMT5937B/TR7.
How is thermal performance defined for 1PMT5937C/TR7?
1PMT5937C/TR7 has a junction-to-TAB1 thermal resistance of 30°C/W, measured with TAB 1 held at 60°C. Full 3.0 W power dissipation is only achievable when TAB 1 is thermally anchored to sufficient PCB copper area; derating applies above 60°C ambient or with limited copper.
Does 1PMT5937C/TR7 require special PCB layout considerations?
Yes-TAB 1 must be connected to a dedicated thermal pad with ≥25 mm² of 2-oz copper and at least four thermal vias to inner ground planes. The DO-216 footprint requires exact pad dimensions per MSC0995 mechanical drawing; misalignment risks flux entrapment despite the metallic bottom design.
What does the "TR7" suffix indicate in 1PMT5937C/TR7?
The "TR7" suffix specifies tape-and-reel packaging per EIA-481 standard, with 3,000 units per 7-inch reel. This format ensures compatibility with high-speed SMT pick-and-place equipment and supports automated manufacturing without manual handling or static exposure.
Can 1PMT5937C/TR7 replace older through-hole Zeners like 1N4748A in existing designs?
No direct replacement is possible without layout revision: 1PMT5937C/TR7 uses a DO-216 surface-mount footprint, while 1N4748A is DO-41 through-hole. Electrical substitution requires verifying thermal margin, as 1PMT5937C/TR7 delivers 3× the power rating but demands proper PCB thermal design-not just pin count or voltage match.
1PMT5937C/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):
- 33 V
- Tolerance:
- ±2%
- Power - Max:
- 3 W
- Impedance (Max) (Zzt):
- 33 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 25.1 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
1PMT5937C/TR7 FAQ
1.How can I place an order for 1PMT5937C/TR7 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1PMT5937C/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 1PMT5937C/TR7 reliable?
The price and inventory of 1PMT5937C/TR7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1PMT5937C/TR7 is usually 5 days.
3.What payment methods are accepted for 1PMT5937C/TR7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1PMT5937C/TR7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1PMT5937C/TR7?
1PMT5937C/TR7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1PMT5937C/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 1PMT5937C/TR7?
For technical support, including 1PMT5937C/TR7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1PMT5937C/TR7 requirements.
6.How does Aetrix verify that 1PMT5937C/TR7 is sourced from the original manufacturer or authorized distributors?
All 1PMT5937C/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 1PMT5937C/TR7 meets industry standards.
7.What is the process for return or replacement of 1PMT5937C/TR7?
All 1PMT5937C/TR7 units undergo pre-shipment inspection (PSI). If there is an issue with 1PMT5937C/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 1PMT5937C/TR7 part is unused and in its original packaging.
Return procedure for 1PMT5937C/TR7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1PMT5937C/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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