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Microchip Technology 1PMT5937AE3/TR7
- Part No.:
- 1PMT5937AE3/TR7
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-216AA
- Datasheet:
-
1PMT5937AE3/TR7.pdf
- Description:
- DIODE ZENER 33V 3W DO216AA
- Quantity:
- Payment:
- Shipping:
Inventory:4,701
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Product details
Overview
1PMT5937AE3/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 max 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 1PMT5937AE3/TR7 datasheet, 1PMT5937AE3/TR7 pinout, 1PMT5937AE3/TR7 application, or 1PMT5937AE3/TR7 equivalent, key selection criteria include zener voltage tolerance, thermal resistance (30°C/W junction-to-TAB), ESD rating (>16 kV HBM), low knee impedance, and compatibility with automated SMT assembly.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable voltage across load variations. Its Powermite® package features a full metallic bottom and integral heat sink locking tab, enabling efficient thermal conduction from junction to PCB via TAB 1 - the cathode terminal - with measured thermal resistance of 30°C/W.
Electrical behavior is defined at TL = 30°C with IZT = 11.4 mA; voltage regulation is validated under steady-state DC conditions, with dynamic impedance measured using 60 Hz RMS AC superimposed at 10% of IZT. Reverse leakage remains ≤1 µA up to VR = 25.1 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 33 V ±5% - stable reference voltage at 11.4 mA, suitable for 3.3 V–200 V design range coverage |
| Power Dissipation | 3.0 W at TAB 1 = 60°C - enables high-power SMT operation without external heatsink |
| Dynamic Impedance (ZZT) | 33 Ω at IZT - low AC impedance ensures minimal voltage deviation under varying load current |
| Knee Impedance (ZZK) | 800 Ω at IZK = 0.25 mA - defines usable regulation threshold near minimum current |
| Thermal Resistance | 30°C/W junction-to-TAB - quantifies thermal path efficiency from die to PCB copper pad |
| ESD Rating | >16 kV HBM - robust handling in automated manufacturing and field environments |
| Reverse Leakage | ≤1 µA at VR = 25.1 V - ensures low standby power loss in clamping or reference applications |
Pinout & Package
The 1PMT5937AE3/TR7 uses the DO-216 surface-mount package (Powermite®), with molded plastic body, full metallic bottom, and cathode designated by TAB 1. Mounting orientation is unrestricted.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TAB 1 | Cathode | Primary heat-sinking terminal; must be soldered to copper pour for thermal management and electrical return |
| Lead 2 | Anode | Signal input terminal; connects to unregulated rail or transient source in clamp configuration |
Key Features
| Feature | Design Value |
|---|---|
| Integral Heat Sink Locking Tab | Mechanically anchors device during reflow and conducts heat directly from junction to PCB via TAB 1 |
| Full Metallic Bottom | Eliminates solder flux entrapment risk and improves thermal transfer vs. standard plastic SMD packages |
| Automated Insertion Compatibility | Designed for pick-and-place and reflow processes per EIA-481 tape-and-reel packaging standard |
| Tight Tolerance Options | ±5% standard; ±2% (suffix C) and ±1% (suffix D) available for precision reference designs |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Regulates output voltage in isolated flyback converters via optocoupler feedback loop. IC Role / Device Role / Timing Role: Zener reference sets error amplifier trip point; placed across secondary-side TL431 cathode-anode path. Use Value: 33 V rating allows direct use with 24 V systems requiring margin; 33 Ω ZZT minimizes feedback loop gain variation. | Use Scenario: Protects downstream ICs from surge events on 24 V industrial bus lines. IC Role / Device Role / Timing Role: Shunts excess energy to ground when bus voltage exceeds 33 V, triggered by fast transients. Use Value: >16 kV HBM ESD rating ensures survivability during handling; 3.0 W rating sustains 8/20 µs surges without degradation. |
| Programmable Voltage Reference | DC-DC Converter Trim Circuit |
Use Scenario: Provides stable 33 V reference for DAC-based analog setpoint generation in PLC modules. IC Role / Device Role / Timing Role: Serves as primary voltage reference for 16-bit DAC buffer stage, replacing bulkier through-hole Zeners. Use Value: ±5% tolerance meets 12-bit effective resolution requirements; DO-216 footprint saves board space vs. DO-41. | Use Scenario: Fine-tunes output voltage of adjustable buck regulator (e.g., LM2678) in telecom power modules. IC Role / Device Role / Timing Role: Connected between feedback divider and ground to offset reference voltage dynamically. Use Value: Low 1 µA IR at 25.1 V prevents significant current injection into FB node; 30°C/W thermal resistance maintains stability under load step. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5937BRLG | Same 33 V nominal, ±5%, but in DO-41 package; 1.2 W rating; no metallic bottom or locking tab | Limited to lower-power through-hole designs; unsuitable for high-current SMT thermal management | Select only if legacy through-hole layout or cost-driven replacement is required |
| BZX84-C33LT1G | 33 V, ±5%, SOT-23 package; 300 mW rating; 100 Ω typical ZZT; 100 nA IR at 25 V | Lower power, higher impedance - appropriate for signal-level biasing, not power regulation | Choose for low-current bias networks where space is critical and power < 0.3 W |
Compared with 1N5937BRLG and BZX84-C33LT1G, the 1PMT5937AE3/TR7 uniquely delivers 3.0 W power handling in an SMT package with engineered thermal path - making it the only option among the three capable of sustained regulation in 24 V industrial power rails with >100 mA load steps.
Availability
1PMT5937AE3/TR7 is available at Aetrix Electronics and suitable for switch-mode power supplies, overvoltage protection circuits, programmable voltage references, and DC-DC converter trim applications requiring stable component supply and long-term industrial availability.
Supply support for 1PMT5937AE3/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 RF solutions for aerospace, defense, and industrial markets.
The Powermite® Zener diode product line was designed to deliver high-power, thermally optimized surface-mount voltage regulation - bridging the performance gap between traditional through-hole Zeners and modern SMT constraints.
FAQ
What is the cathode identification method for 1PMT5937AE3/TR7?
The cathode of the 1PMT5937AE3/TR7 is designated by TAB 1, which is the larger metallic terminal on the device's underside. This is confirmed in the mechanical specifications section of the MSC0995.PDF datasheet, where TAB 1 is explicitly labeled as the cathode and serves as both electrical connection and primary thermal path to the PCB.
Does 1PMT5937AE3/TR7 support automated SMT assembly?
Yes, the 1PMT5937AE3/TR7 is fully compatible with automated insertion equipment. Its Powermite® package design - including the locking tab and uniform footprint - and EIA-481 tape-and-reel packaging (7-inch reel, 3,000 pieces) are optimized for pick-and-place and reflow processes, as stated in the FEATURES section of the official datasheet.
What is the maximum reverse voltage before breakdown for 1PMT5937AE3/TR7?
The maximum reverse voltage before reaching specified Zener breakdown is 25.1 V, at which point reverse leakage is guaranteed ≤1 µA. This value (VR) is listed in the Electrical Characteristics table for 1PMT5937B in MSC0995.PDF and applies identically to the 1PMT5937AE3/TR7 variant, as no parameter divergence is indicated across suffixes.
How does thermal resistance affect PCB layout for 1PMT5937AE3/TR7?
The 1PMT5937AE3/TR7 has a junction-to-TAB thermal resistance of 30°C/W, meaning TAB 1 must be soldered to a sufficiently sized copper pour to dissipate 3.0 W without exceeding the 150°C max junction temperature. Layouts should avoid narrow traces or thermal relief on TAB 1 and instead use solid copper connections to internal ground or power planes.
Is 1PMT5937AE3/TR7 RoHS compliant?
While the original MSC0995.PDF datasheet predates RoHS enforcement, Microsemi's Powermite® family - including 1PMT5937AE3/TR7 - is manufactured to RoHS-compliant standards per Microchip's current product declarations. Full compliance documentation is available upon request from Aetrix Electronics' technical support team.
1PMT5937AE3/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
1PMT5937AE3/TR7 FAQ
1.How can I place an order for 1PMT5937AE3/TR7 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1PMT5937AE3/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 1PMT5937AE3/TR7 reliable?
The price and inventory of 1PMT5937AE3/TR7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1PMT5937AE3/TR7 is usually 5 days.
3.What payment methods are accepted for 1PMT5937AE3/TR7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1PMT5937AE3/TR7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1PMT5937AE3/TR7?
1PMT5937AE3/TR7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1PMT5937AE3/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 1PMT5937AE3/TR7?
For technical support, including 1PMT5937AE3/TR7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1PMT5937AE3/TR7 requirements.
6.How does Aetrix verify that 1PMT5937AE3/TR7 is sourced from the original manufacturer or authorized distributors?
All 1PMT5937AE3/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 1PMT5937AE3/TR7 meets industry standards.
7.What is the process for return or replacement of 1PMT5937AE3/TR7?
All 1PMT5937AE3/TR7 units undergo pre-shipment inspection (PSI). If there is an issue with 1PMT5937AE3/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 1PMT5937AE3/TR7 part is unused and in its original packaging.
Return procedure for 1PMT5937AE3/TR7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1PMT5937AE3/TR7 Tags
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