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Microchip Technology 1PMT5937/TR7
- Part No.:
- 1PMT5937/TR7
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-216AA
- Datasheet:
-
1PMT5937/TR7.pdf
- Description:
- DIODE ZENER 33V 3W DO216AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,497
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Product details
Overview
1PMT5937/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 (VR). It serves as a precision voltage reference or overvoltage clamp in power supply regulation and ESD protection circuits.
For engineers reviewing the 1PMT5937/TR7 datasheet, 1PMT5937/TR7 pinout, 1PMT5937/TR7 application, or 1PMT5937/TR7 equivalent, key selection criteria include its 33 V nominal Zener voltage, 3.0 W thermal capability with metallic-tab heat sinking, DO-216 mechanical outline, and >16 kV HBM ESD rating - all critical for compact, high-reliability DC biasing and transient suppression designs.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable voltage across its terminals under varying load or line conditions. Its Powermite® package integrates a full metallic bottom and locking tab that directly conducts heat from the junction to the PCB pad, achieving 30°C/W thermal resistance from junction to TAB 1.
The device exhibits low knee impedance (ZZK = 0.25 Ω) and tight voltage regulation at IZT = 11.4 mA, with reverse leakage limited to ≤1 µA at VR = 25.1 V. It is specified over -55°C to +150°C junction temperature range and compatible with EIA-481 tape-and-reel automated assembly.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 33 V ±5% at IZT = 11.4 mA, TL = 30°C - defines stable clamping/reference level under nominal bias |
| Power Dissipation | 3.0 W at TAB 1 = 60°C - maximum continuous DC power handled with defined thermal mounting |
| Dynamic Impedance (ZZT) | 33 Ω at IZT = 11.4 mA - indicates voltage regulation stiffness near operating point |
| Reverse Leakage (IR) | ≤1 µA at VR = 25.1 V - ensures minimal standby current in high-impedance bias networks |
| Thermal Resistance | 30°C/W junction-to-TAB 1 - quantifies thermal path efficiency when mounted on copper pad |
| ESD Rating | >16 kV per Human Body Model - supports robustness in handling and end-equipment surge environments |
| Junction Temp Range | -55°C to +150°C - enables operation in automotive under-hood and industrial control environments |
Pinout & Package
Package: Powermite® (DO-216AA), molded surface-mount package with full metallic bottom and integral locking tab acting as thermal interface. Cathode is 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 and electrical connection |
| Lead 2 | Anode | Standard anode connection; electrically isolated from TAB 1; used for circuit return path |
Key Features
| Feature | Design Value |
|---|---|
| Full metallic bottom | Eliminates solder flux entrapment during reflow, improving long-term solder joint reliability |
| Integral heat sink locking tab | Provides direct thermal conduction path from junction to PCB, enabling 3.0 W operation in SMT footprint |
| DO-216AA mechanical outline | Enables compatibility with standard pick-and-place equipment and EIA-481 tape-and-reel feeding |
| Low reverse leakage | ≤1 µA at 25.1 V ensures minimal quiescent current draw in battery-powered or high-impedance reference circuits |
Applications
| Switch-Mode Power Supply Feedback | Industrial Sensor Biasing |
|---|---|
Use Scenario: Used in optocoupler-based feedback loop of isolated DC-DC converters to regulate output voltage. IC Role / Device Role / Timing Role: Zener reference providing precise 33 V threshold to drive optocoupler LED current. Use Value: Tight 33 V ±5% tolerance and low ZZT ensure stable regulation despite input ripple and load transients. | Use Scenario: Supplies stable bias voltage to bridge-based pressure or temperature sensors in factory automation nodes. IC Role / Device Role / Timing Role: Voltage reference establishing common-mode level for instrumentation amplifier inputs. Use Value: Low IR (<1 µA) prevents loading of high-impedance sensor outputs, preserving measurement accuracy. |
| Automotive ECU Overvoltage Clamp | Programmable Logic Controller Input Protection |
Use Scenario: Placed across microcontroller I/O rail to suppress load-dump transients in 12 V vehicle systems. IC Role / Device Role / Timing Role: Transient voltage suppressor clamping rail to 33 V during ISO 7637-2 pulse 5a events. Use Value: >16 kV HBM ESD rating and 3.0 W power handling enable single-device protection without external series resistance. | Use Scenario: Protects digital input channels of PLC modules against field-wiring surges and miswiring. IC Role / Device Role / Timing Role: Primary Zener clamp limiting input voltage to safe logic levels before Schmitt-trigger buffer. Use Value: DO-216AA footprint allows dense layout; metallic tab ensures reliable thermal dissipation during repeated surge events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMF33A (ON Semiconductor) | Same 33 V nominal voltage, but 200 W peak power (transient only); 1.0 W steady-state rating; SOD-123FL package | Designed for surge suppression, not continuous regulation; lacks metallic thermal tab | Choose SMF33A only for transient-only clamping; avoid where 3.0 W DC bias stability is required |
| BZX84-C33 (Diodes Inc.) | 33 V ±5%, 300 mW rating, SOT-23 package; no integrated heat sink; ZZT ≈ 90 Ω | Limited to low-power biasing; unsuitable for >100 mA regulation or thermal cycling stress | Select BZX84-C33 only for space-constrained, low-current references; not interchangeable for power-handling roles |
Compared with SMF33A and BZX84-C33, the 1PMT5937/TR7 uniquely delivers 3.0 W continuous Zener regulation in a thermally optimized SMT package - making it the only option among the three capable of stable DC biasing under sustained load while maintaining low impedance and high ESD resilience.
Availability
1PMT5937/TR7 is available at Aetrix Electronics and suitable for switch-mode power supplies, industrial sensor interfaces, automotive ECUs, and programmable logic controller input protection requiring stable component supply and long-lifecycle support.
Supply support for 1PMT5937/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, surface-mount voltage regulation in miniature packages - specifically addressing thermal and assembly challenges in automated manufacturing of ruggedized power electronics.
FAQ
What is the Zener voltage tolerance for 1PMT5937/TR7?
The 1PMT5937/TR7 has a standard Zener voltage tolerance of ±5% at 33 V, measured at IZT = 11.4 mA and TAB 1 temperature of 30°C. Tighter tolerances (±2% and ±1%) are available with suffixes C and D respectively, but the /TR7 variant uses the standard ±5% grade. This tolerance directly impacts regulation accuracy in precision reference applications.
How is thermal performance achieved in the 1PMT5937/TR7 Powermite® package?
The 1PMT5937/TR7 achieves 3.0 W power dissipation via its Powermite® package's full metallic bottom and integral locking tab, which serve as a direct thermal interface to the PCB copper pad. Its specified junction-to-TAB 1 thermal resistance is 30°C/W, meaning proper pad design and solder coverage are essential to realize full power capability - unlike plastic-SMD diodes without metal thermal paths.
Can 1PMT5937/TR7 be used in place of through-hole Zener diodes like 1N5256B?
Yes, the 1PMT5937/TR7 provides equivalent 33 V Zener functionality in surface-mount form but with superior thermal performance: it handles 3.0 W versus 0.5 W for the 1N5256B, and features a metallic thermal tab instead of lead-frame conduction. However, PCB layout must accommodate the DO-216AA footprint and thermal pad - it is not a drop-in replacement without board revision.
What does the "/TR7" suffix indicate for 1PMT5937/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 automated SMT placement equipment. The base part number 1PMT5937 identifies the 33 V Zener variant within the Powermite® family; the TR7 designation confirms packaging configuration, not electrical differentiation.
Is the 1PMT5937/TR7 suitable for automotive applications?
Yes, the 1PMT5937/TR7 is qualified for automotive use with a junction temperature range of -55°C to +150°C and >16 kV HBM ESD rating - meeting requirements for under-hood engine control units and body electronics. Its robust Powermite® package resists thermal cycling and mechanical stress, and its 33 V clamping level aligns with 12 V system overvoltage protection standards such as ISO 7637-2.
1PMT5937/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:
- ±20%
- 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
1PMT5937/TR7 FAQ
1.How can I place an order for 1PMT5937/TR7 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1PMT5937/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 1PMT5937/TR7 reliable?
The price and inventory of 1PMT5937/TR7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1PMT5937/TR7 is usually 5 days.
3.What payment methods are accepted for 1PMT5937/TR7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1PMT5937/TR7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1PMT5937/TR7?
1PMT5937/TR7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1PMT5937/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 1PMT5937/TR7?
For technical support, including 1PMT5937/TR7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1PMT5937/TR7 requirements.
6.How does Aetrix verify that 1PMT5937/TR7 is sourced from the original manufacturer or authorized distributors?
All 1PMT5937/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 1PMT5937/TR7 meets industry standards.
7.What is the process for return or replacement of 1PMT5937/TR7?
All 1PMT5937/TR7 units undergo pre-shipment inspection (PSI). If there is an issue with 1PMT5937/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 1PMT5937/TR7 part is unused and in its original packaging.
Return procedure for 1PMT5937/TR7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1PMT5937/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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BZT52C15-7-F
Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
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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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