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Microchip Technology 1N4752P/TR12
- Part No.:
- 1N4752P/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4752P/TR12.pdf
- Description:
- DIODE ZENER 33V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:4,682
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Product details
Overview
1N4752P/TR12 from Microsemi is a 1.0 W axial-lead silicon Zener diode with a nominal zener voltage of 33 V ±5%, 7.5 mA test current (IZT), 45 Ω dynamic impedance (ZZT), and maximum reverse current of 5 μA at 25.1 V. It operates from –65°C to +150°C and is used for precision voltage regulation in power supply feedback loops, overvoltage protection circuits, and reference voltage generation.
For engineers reviewing the 1N4752P/TR12 datasheet, 1N4752P/TR12 pinout, 1N4752P/TR12 application, or 1N4752P/TR12 equivalent, key selection criteria include zener voltage tolerance, thermal resistance (45 °C/W junction-to-lead), surge current rating (1000 mA), RoHS-compliant "e3" plating option, and DO-41 package compatibility with standard axial-lead PCB footprints.
Technical Context
This device functions as a passive voltage reference by operating in reverse breakdown, maintaining stable output voltage across a wide current range (1–135 mA). Its 33 V nominal zener voltage places it in the mid-range of the 1N47xxAP series, where temperature coefficient transitions from negative to positive-enabling improved stability in compensated designs.
The DO-41 plastic package delivers lower thermal resistance than glass-body variants (G suffix), supporting reliable 1.0 W dissipation at lead temperature ≤105°C. Polarity is marked by a cathode band; regulation requires the banded end to be biased positive relative to the anode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 33 V ±5% at 7.5 mA - defines regulated output level with tight tolerance suitable for feedback sensing in switching regulators. |
| Power Dissipation | 1.0 W at TL ≤105°C - supports continuous operation in compact layouts with adequate lead heatsinking. |
| Dynamic Impedance (ZZT) | 45 Ω at IZT = 7.5 mA - indicates low AC impedance for stable regulation under varying load conditions. |
| Reverse Leakage Current | 5 μA max at VR = 25.1 V - ensures minimal quiescent power loss in high-impedance bias networks. |
| Surge Current (ISM) | 1000 mA (½-sine, 1/120 s) - withstands transient overloads without degradation during startup or fault events. |
| Thermal Resistance | 45 °C/W junction-to-lead (3/8″ lead length) - enables accurate thermal modeling for reliability prediction in linear regulator shunt paths. |
| Operating Temperature | –65°C to +150°C - qualified for industrial, automotive under-hood, and aerospace environments requiring wide ambient tolerance. |
Pinout & Package
Package: DO-41 (JEDEC DO-204AL), axial-lead plastic encapsulated case with cathode band marking. Moisture sensitivity level 1 (no dry pack required).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference ground node in shunt regulator configuration | Connected to system ground or lower-potential rail; forms return path for zener current. |
| Cathode | Regulated output node | Banded end; connected to feedback point or protected circuit node; must be held positive relative to anode for regulation. |
Key Features
| Feature | Design Value |
|---|---|
| Plastic DO-41 construction (P suffix) | 45 °C/W junction-to-lead thermal resistance - improves power handling vs. glass-body equivalents. |
| RoHS-compliant "e3" plating option | Tin-only matte finish per MIL-STD-750 Method 2026 - ensures solderability and environmental compliance without lead. |
| JEDEC-registered 5% tolerance (A suffix) | ±5% VZ at 25°C - balances cost and precision for non-critical voltage references. |
| Nonsensitive to ESD | Qualified per MIL-STD-750 Method 1020 - eliminates need for special handling during assembly. |
| Moisture classification Level 1 | No dry pack required per IPC/JEDEC J-STD-020B - reduces manufacturing prep time and cost. |
Applications
| Switching Power Supply Feedback | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Used in the optocoupler feedback network of an isolated DC-DC converter to regulate output voltage. IC Role / Device Role / Timing Role: Zener diode provides precise 33 V reference to drive optocoupler LED when output exceeds setpoint. Use Value: Enables ±5% output regulation accuracy while tolerating input transients up to 1000 mA surge current. | Use Scenario: Placed across a 24 V rail to clamp surges above 33 V during load dump or inductive kickback. IC Role / Device Role / Timing Role: Shunt element that conducts excess energy to ground once voltage exceeds 33 V threshold. Use Value: Limits peak rail voltage to safe levels for downstream ICs rated for ≤36 V absolute maximum. |
| Programmable Voltage Reference | Current Source Bias Network |
Use Scenario: Paired with a resistor to generate a stable 33 V reference for ADC reference buffers or DAC calibration. IC Role / Device Role / Timing Role: Passive voltage source establishing fixed potential independent of supply variation. Use Value: Delivers 33 V ±5% with 45 Ω dynamic impedance, minimizing error contribution in precision analog signal chains. | Use Scenario: Biases the gate of a MOSFET in a constant-current sink for LED driver or sensor excitation. IC Role / Device Role / Timing Role: Sets gate voltage via resistive divider anchored to 33 V zener reference. Use Value: Ensures stable current despite 25°C–125°C ambient shifts due to low temperature coefficient near 33 V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4752A | No TR12 tape-and-reel packaging; bulk or ammo pack only | Lacks standardized reel format for automated SMT placement | Select 1N4752P/TR12 for pick-and-place production; choose 1N4752A for manual prototyping or low-volume repair. |
| MMBZ5255BLT1G | Surface-mount SOT-23 package; 33 V ±5%; 225 mW power rating | Not interchangeable due to 0.225 W vs. 1.0 W dissipation and different thermal path | Use MMBZ5255BLT1G only in space-constrained, low-power designs; retain 1N4752P/TR12 for ≥1 W regulation needs. |
Compared with 1N4752A and MMBZ5255BLT1G, the 1N4752P/TR12 uniquely combines 1.0 W power handling, DO-41 axial-leaded manufacturability, and EIA-296-compliant tape-and-reel delivery-making it optimal for high-reliability, medium-power industrial power supplies requiring consistent reel-fed assembly.
Availability
1N4752P/TR12 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, and test equipment requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for 1N4752P/TR12 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, RF, and timing solutions for aerospace, defense, and industrial markets.
The 1N47xxAP series was designed specifically for robust, cost-effective voltage regulation in harsh-environment power systems-emphasizing thermal performance, ESD immunity, and JEDEC-standardized interchangeability.
FAQ
What is the zener voltage tolerance of the 1N4752P/TR12?
The 1N4752P/TR12 has a nominal zener voltage of 33 V with a tolerance of ±5%, indicated by the "A" suffix in the part number. This tolerance is specified at 25°C lead temperature with 7.5 mA test current and applies across the full operating temperature range of –65°C to +150°C per Microsemi's published electrical characteristics table.
Does the 1N4752P/TR12 have RoHS-compliant plating?
Yes, the 1N4752P/TR12 uses RoHS-compliant annealed matte-tin plating on its axial leads, conforming to MIL-STD-750 Method 2026. The "e3" designation in Microsemi's full part family (e.g., 1N4752AP,e3) confirms this compliance, and the TR12 variant inherits the same terminal finish as the base part.
What package type does the 1N4752P/TR12 use?
The 1N4752P/TR12 uses the DO-41 (JEDEC DO-204AL) plastic axial-lead package. It features a void-free thermosetting epoxy body rated UL94V-0, cathode band marking, and mechanical dimensions compliant with standard DO-41 footprints on FR4 PCBs.
Can the 1N4752P/TR12 replace a glass-body 1N4752G in existing designs?
The 1N4752P/TR12 is not a direct drop-in replacement for 1N4752G due to differing thermal resistance: the plastic P-suffix version has 45 °C/W junction-to-lead, while the glass G-suffix version has higher thermal resistance. Layout changes may be needed to ensure equivalent power derating, especially above 70°C ambient.
What is the maximum surge current rating for the 1N4752P/TR12?
The 1N4752P/TR12 has a maximum non-repetitive reverse surge current (ISM) of 1000 mA, measured using a ½-sine wave pulse of 1/120 second duration at 25°C ambient. This rating supports transient suppression in power rails subject to load dump or inductive switching events.
1N4752P/TR12 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-204AL, DO-41, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 33 V
- Tolerance:
- ±10%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 45 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 25.1 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.2 V @ 200 mA
- Operating Temperature:
- -65°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AL (DO-41)
1N4752P/TR12 FAQ
1.How can I place an order for 1N4752P/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4752P/TR12 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 1N4752P/TR12 reliable?
The price and inventory of 1N4752P/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4752P/TR12 is usually 5 days.
3.What payment methods are accepted for 1N4752P/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4752P/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4752P/TR12?
1N4752P/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4752P/TR12 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 1N4752P/TR12?
For technical support, including 1N4752P/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4752P/TR12 requirements.
6.How does Aetrix verify that 1N4752P/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N4752P/TR12 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 1N4752P/TR12 meets industry standards.
7.What is the process for return or replacement of 1N4752P/TR12?
All 1N4752P/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4752P/TR12, 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 1N4752P/TR12 part is unused and in its original packaging.
Return procedure for 1N4752P/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4752P/TR12 Tags
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