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Microchip Technology 1PMT5937A/TR7
- Part No.:
- 1PMT5937A/TR7
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-216AA
- Datasheet:
-
1PMT5937A/TR7.pdf
- Description:
- DIODE ZENER 33V 3W DO216AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,662
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Product details
Overview
1PMT5937A/TR7 from Microsemi is a 33 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 11.4 mA test current (IZT), 33 Ω dynamic impedance (ZZT), and <1 µA reverse leakage at 25.1 V. It serves as a precision voltage reference or overvoltage clamp in power supply regulation circuits.
For engineers reviewing the 1PMT5937A/TR7 datasheet, 1PMT5937A/TR7 pinout, 1PMT5937A/TR7 application, or 1PMT5937A/TR7 equivalent, key selection criteria include zener voltage accuracy, thermal resistance (30°C/W junction-to-TAB), ESD robustness (>16 kV HBM), low knee impedance, and compatibility with automated SMT assembly per EIA-481 tape-and-reel packaging.
Technical Context
This Zener diode operates in reverse breakdown mode with tightly controlled voltage regulation across its specified current range. Its Powermite® package features a full metallic bottom and integral heat sink locking tab, enabling efficient thermal transfer from junction to PCB via TAB 1 - confirmed by 30°C/W thermal resistance and 3.0 W power rating at TAB temperature of 60°C.
The device exhibits low reverse leakage (<1 µA at VR = 25.1 V), tight dynamic impedance (33 Ω at IZT = 11.4 mA), and stable knee characteristics (IZK = 0.25 mA, ZZK = 800 Ω), supporting reliable clamping and reference functions in compact, thermally constrained designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 33 V ±5% at IZT = 11.4 mA, TL = 30°C - defines nominal regulation point under standard test conditions |
| Power Dissipation | 3.0 W at TAB 1 = 60°C - maximum continuous DC power handling with defined thermal boundary condition |
| Dynamic Impedance (ZZT) | 33 Ω at IZT = 11.4 mA - indicates small-signal AC resistance near operating point; impacts regulation stability under load transients |
| Thermal Resistance | 30°C/W junction-to-TAB 1 - quantifies thermal path efficiency; enables PCB copper area design for thermal management |
| ESD Rating | >16 kV per Human Body Model - ensures robustness against common electrostatic discharge events during handling and assembly |
| Reverse Leakage (IR) | <1 µA at VR = 25.1 V - confirms minimal off-state conduction, critical for low-power standby and precision biasing |
| Knee Current (IZK) | 0.25 mA - minimum current required to enter useful regulation region; supports low-current reference applications |
Pinout & Package
Package: Powermite® (DO-216AA) surface-mount molded 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 heat sink interface and electrical cathode connection; must be soldered to thermal pad for rated 3.0 W operation |
| Lead 2 | Anode | Standard anode terminal; mounted opposite TAB 1; requires standard SMT reflow profile per EIA-481 tape-and-reel |
Key Features
| Feature | Design Value |
|---|---|
| Surface-mount Powermite® package | Enables automated placement and reflow; eliminates through-hole assembly while maintaining 3.0 W power capability |
| Full metallic bottom | Prevents solder flux entrapment during reflow, improving long-term reliability and void-free solder joints |
| Integral heat sink locking tab | Provides mechanical anchoring and direct thermal conduction path from junction to PCB copper area |
| EIA-481 tape-and-reel packaging | Supports high-volume SMT production with 3,000 pieces per 7-inch reel |
| Wide zener voltage range availability | Part of 1PMT5913B–1PMT5956B family covering 3.3 V to 200 V - simplifies BOM consolidation across designs |
Applications
| Industrial Power Supply Regulation | Automotive ECUs |
|---|---|
Use Scenario: Stabilizing feedback voltage in isolated flyback or forward converter auxiliary supplies. IC Role / Device Role / Timing Role: Precision voltage reference and overvoltage clamp protecting optocoupler input and controller IC. Use Value: Maintains ±5% output regulation over temperature and line variations using 33 V breakdown with low ZZT (33 Ω) and stable IZK (0.25 mA). | Use Scenario: Overvoltage protection on 12 V battery-supplied microcontroller I/O lines and sensor interfaces. IC Role / Device Role / Timing Role: Transient voltage suppressor and clamping diode safeguarding against load dump spikes up to 35 V. Use Value: Withstands >16 kV HBM ESD and clamps at 33 V with <1 µA leakage at 25.1 V, ensuring signal integrity without parasitic loading. |
| Medical Diagnostic Equipment | Telecom Line Cards |
Use Scenario: Providing stable bias voltage for analog front-end amplifiers and ADC references in portable ultrasound units. IC Role / Device Role / Timing Role: Low-noise voltage reference source with minimal thermal drift and leakage-induced offset error. Use Value: Achieves stable 33 V reference with 30°C/W thermal resistance and 11.4 mA IZT, minimizing self-heating effects in sealed enclosures. | Use Scenario: Protecting Ethernet PHY interfaces and PoE detection circuitry from induced surges on RJ45 lines. IC Role / Device Role / Timing Role: Secondary-level transient suppressor placed after primary gas discharge tube or TVS array. Use Value: Delivers fast response and precise 33 V clamping with 33 Ω dynamic impedance, limiting residual surge voltage to safe levels for sensitive PHY ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5937A | Same 33 V zener voltage and ±5% tolerance, but in DO-41 axial package; higher thermal resistance (~50°C/W), no integrated heat sink tab | Requires through-hole mounting and larger board area; unsuitable for high-density SMT layouts | Select 1N5937A only when legacy through-hole assembly or higher standoff voltage (1000 V PRV) is required |
| BZX84-C33 | 33 V SOT-23 Zener; lower power rating (300 mW), higher ZZT (~90 Ω), no metallic thermal pad | Limited to low-power biasing; cannot replace 1PMT5937A/TR7 in 3.0 W clamping or regulation roles | Choose BZX84-C33 only for space-constrained, low-current reference use where thermal performance is non-critical |
Compared with 1N5937A and BZX84-C33, the 1PMT5937A/TR7 uniquely combines 3.0 W power handling, 30°C/W thermal resistance, and SMT compatibility in a single package - making it irreplaceable for high-reliability, thermally demanding surface-mount voltage regulation.
Availability
1PMT5937A/TR7 is available at Aetrix Electronics and suitable for industrial power supply regulation, automotive ECU protection, and medical diagnostic equipment requiring stable component supply and consistent thermal performance.
Supply support for 1PMT5937A/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 product line was engineered for high-power density surface-mount voltage regulation and transient suppression in space-constrained, thermally demanding environments - emphasizing thermal efficiency, ESD resilience, and automated manufacturability.
FAQ
What is the zener voltage tolerance of the 1PMT5937A/TR7?
The 1PMT5937A/TR7 has a standard zener voltage tolerance of ±5% at 33 V, measured at IZT = 11.4 mA and TAB temperature of 30°C. Tighter tolerances (±2% and ±1%) are available with suffixes C and D respectively, but the /TR7 variant ships with standard ±5% tolerance as specified in MSC0995 Rev F.
How is thermal management handled for the 1PMT5937A/TR7 in PCB layout?
The 1PMT5937A/TR7 relies on TAB 1 as its primary thermal interface. To achieve the rated 3.0 W dissipation, TAB 1 must be soldered to a minimum copper area per Microsemi's recommended pad dimensions, leveraging the 30°C/W junction-to-TAB thermal resistance. The full metallic bottom and locking tab ensure low-impedance conduction into the PCB plane.
Is the 1PMT5937A/TR7 compatible with lead-free reflow processes?
Yes, the 1PMT5937A/TR7 is qualified for standard lead-free reflow profiles. Its Powermite® package construction and molding compound meet JEDEC MSL-1 requirements. The device is supplied in EIA-481 tape-and-reel format (7-inch reel, 3,000 pieces), fully compatible with automated SMT lines using IPC-J-STD-020-compliant thermal cycles.
What is the maximum reverse voltage rating before breakdown for the 1PMT5937A/TR7?
The 1PMT5937A/TR7 has a maximum reverse voltage (VR) of 25.1 V - the voltage at which reverse leakage current is guaranteed ≤1 µA. Breakdown begins near this point and reaches nominal 33 V regulation at IZT = 11.4 mA. Operation above 25.1 V in non-breakdown mode is not recommended due to exponential leakage increase.
Does the 1PMT5937A/TR7 have a documented ESD rating, and what test model applies?
Yes, the 1PMT5937A/TR7 is rated for >16 kV per the Human Body Model (HBM), as stated in the MSC0995 datasheet. This rating reflects robustness against common electrostatic discharge events encountered during handling, pick-and-place, and board assembly - critical for high-yield manufacturing of sensitive systems.
1PMT5937A/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:
- ±10%
- 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
1PMT5937A/TR7 FAQ
1.How can I place an order for 1PMT5937A/TR7 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1PMT5937A/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 1PMT5937A/TR7 reliable?
The price and inventory of 1PMT5937A/TR7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1PMT5937A/TR7 is usually 5 days.
3.What payment methods are accepted for 1PMT5937A/TR7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1PMT5937A/TR7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1PMT5937A/TR7?
1PMT5937A/TR7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1PMT5937A/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 1PMT5937A/TR7?
For technical support, including 1PMT5937A/TR7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1PMT5937A/TR7 requirements.
6.How does Aetrix verify that 1PMT5937A/TR7 is sourced from the original manufacturer or authorized distributors?
All 1PMT5937A/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 1PMT5937A/TR7 meets industry standards.
7.What is the process for return or replacement of 1PMT5937A/TR7?
All 1PMT5937A/TR7 units undergo pre-shipment inspection (PSI). If there is an issue with 1PMT5937A/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 1PMT5937A/TR7 part is unused and in its original packaging.
Return procedure for 1PMT5937A/TR7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1PMT5937A/TR7 Tags
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MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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MM5Z5V1ST1G
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SMAJ4744A-TP
Micro Commercial Co
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