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Microchip Technology 1N4751CP/TR8
- Part No.:
- 1N4751CP/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4751CP/TR8.pdf
- Description:
- DIODE ZENER 30V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:7,699
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Product details
Overview
1N4751CP/TR8 from Microsemi is a 1.0 W axial-lead silicon Zener diode with a nominal zener voltage of 30 V ±5%, 8.5 mA test current (IZT), 40 Ω dynamic impedance (ZZT), and maximum reverse current of 5 μA at 22.8 V (VR). 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 1N4751CP/TR8 datasheet, 1N4751CP/TR8 pinout, 1N4751CP/TR8 application, or 1N4751CP/TR8 equivalent, key selection factors include its DO-41 package, 30 V regulation tolerance, thermal resistance of 45°C/W (junction-to-lead), 1.0 W steady-state power rating at TL < 105°C, and RoHS-compliant "e3" plating with tape-and-reel packaging (TR8).
Technical Context
This Zener diode functions as a two-terminal voltage reference device operating in reverse breakdown mode. Its regulation performance is defined at 8.5 mA test current with a sharp knee characterized by 0.5 mA knee current (IZK) and 30 Ω knee impedance (ZZK), ensuring stable clamping across varying load conditions.
The device uses a void-free thermosetting epoxy body (UL94V-0 rated) with tin-lead or matte-tin plating, moisture classified per IPC/JEDEC J-STD-020B Level 1 (no dry pack required), and is ESD-insensitive per MIL-STD-750 Method 1020.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 30 V ±5% at 8.5 mA - defines precise regulation point for feedback and clamp circuits |
| Power Dissipation | 1.0 W at TL < 105°C (3/8″ lead length) - sets maximum continuous thermal load on PCB layout |
| Dynamic Impedance (ZZT) | 40 Ω at IZT = 8.5 mA - determines output voltage stability under load transients |
| Reverse Leakage (IR) | 5 μA max at VR = 22.8 V - ensures low quiescent current in standby regulation |
| Thermal Resistance | 45°C/W junction-to-lead - enables thermal design using lead conduction, not board copper |
| Operating Temperature | –65°C to +150°C - supports industrial and automotive under-hood applications |
| Forward Voltage | 1.2 V max at 200 mA - relevant for polarity verification and forward-bias protection checks |
Pinout & Package
Package: DO-41 (DO-204AL), axial-lead plastic molded case with cathode band marking. Cathode terminal is banded end; device must be reverse-biased (cathode positive) for Zener operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reverse-bias reference return | Connected to circuit ground or lower-potential node during regulation |
| Cathode | Zener regulation output | Banded end; connected to regulated voltage node (e.g., feedback divider tap) |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered 1N47xxAP series | Industry-standard footprint and electrical behavior for drop-in compatibility in legacy designs |
| RoHS-compliant "e3" termination | Matte-tin plating meeting lead-free soldering requirements without reflow reliability risk |
| Tape-and-reel packaging (TR8) | Standard EIA-296 format enabling automated SMT placement despite axial-lead form factor |
| Moisture sensitivity Level 1 | No dry-pack or baking required before assembly - reduces manufacturing overhead |
| Nonsensitive to ESD | Withstands handling per MIL-STD-750 Method 1020 - eliminates need for special ESD controls |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Clamp Protection |
|---|---|
Use Scenario: Regulates output voltage in isolated flyback or forward converters via optocoupler-coupled feedback loop. IC Role / Device Role / Timing Role: Zener reference element setting error amplifier threshold in secondary-side regulation. Use Value: 30 V ±5% tolerance and 40 Ω dynamic impedance ensure tight output regulation (<±2%) across line/load variations. | Use Scenario: Limits transient voltage spikes on DC bus lines caused by inductive switching or lightning surges. IC Role / Device Role / Timing Role: Passive shunt clamp absorbing surge energy above 30 V threshold. Use Value: 1.0 W power rating and 150 mA surge current (ISM) enable reliable clamping of 100–200 ns transients without degradation. |
| Fixed Voltage Reference Source | Microcontroller Reset Circuit |
Use Scenario: Provides stable 30 V reference for ADC calibration or analog sensor excitation in industrial instrumentation. IC Role / Device Role / Timing Role: Precision two-terminal voltage source with low temperature coefficient (≈+0.06%/°C near 30 V). Use Value: 5 μA leakage at 22.8 V minimizes loading error in high-impedance reference dividers. | Use Scenario: Generates reset signal when main supply drops below safe logic level in embedded systems. IC Role / Device Role / Timing Role: Zener-based brown-out detector triggering external reset IC or microcontroller POR circuit. Use Value: Sharp knee (0.5 mA IZK, 30 Ω ZZK) ensures clean, repeatable trip point with minimal hysteresis. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4751A | No "P" suffix → glass-body DO-35 package; higher thermal resistance (105°C/W junction-to-ambient) | Less suitable for high-power-density layouts requiring lead conduction cooling | Select only if legacy DO-35 footprint or non-RoHS assembly is required |
| MMSZ5256ET1G | Surface-mount SOD-123; 30 V ±5%; 0.5 W rating; 100 Ω ZZT; RoHS-compliant | Lower power handling and higher impedance limit use in high-current regulation or precision references | Choose for space-constrained PCBs where 1.0 W dissipation is not needed |
Compared with 1N4751A and MMSZ5256ET1G, the 1N4751CP/TR8 offers superior thermal performance via DO-41 lead conduction, full 1.0 W capability, and tape-and-reel automation support-making it optimal for industrial power supplies and ruggedized voltage references.
Availability
1N4751CP/TR8 is available at Aetrix Electronics and suitable for switch-mode power supplies, overvoltage protection circuits, and fixed-voltage reference designs requiring stable component supply, long-term lifecycle continuity, and RoHS-compliant procurement.
Supply support for 1N4751CP/TR8 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 1N4751CP/TR8 belongs to Microsemi's legacy 1N47xxAP Zener series, designed specifically for robust, JEDEC-standard voltage regulation in harsh-environment power systems where thermal stability and long-term parametric consistency are critical.
FAQ
What is the zener voltage tolerance of the 1N4751CP/TR8?
The 1N4751CP/TR8 has a nominal zener voltage of 30 V with a tolerance of ±5%, as indicated by the "A" suffix in the part number per JEDEC registration. This tolerance applies at 8.5 mA test current and 25°C lead temperature. The 1N4751CP/TR8 maintains this specification across its full operating temperature range of –65°C to +150°C, supporting stable regulation in demanding environments.
Does the 1N4751CP/TR8 require dry packing before PCB assembly?
No, the 1N4751CP/TR8 does not require dry packing. It is moisture classified per IPC/JEDEC J-STD-020B Level 1, meaning it can be stored and assembled without baking or humidity-controlled handling. This simplifies manufacturing logistics and reduces cost for high-volume production of industrial and automotive electronics using the 1N4751CP/TR8.
What is the maximum surge current rating for the 1N4751CP/TR8?
The 1N4751CP/TR8 has a maximum surge current (ISM) rating of 150 mA, measured using a ½ sine-wave pulse of 1/120 second duration at 25°C ambient. This rating enables the 1N4751CP/TR8 to absorb short-duration transients in overvoltage clamp applications without degradation, provided average power dissipation remains within the 1.0 W steady-state limit.
How is polarity marked on the 1N4751CP/TR8?
The 1N4751CP/TR8 uses a cathode band to indicate polarity: the banded end is the cathode and must be held at a higher potential than the anode for proper Zener regulation. This marking aligns with JEDEC DO-41 standards and is laser-etched or molded into the plastic body. Correct orientation is essential-reverse connection renders the 1N4751CP/TR8 nonfunctional as a regulator.
Is the 1N4751CP/TR8 compatible with lead-free reflow soldering?
Yes, the 1N4751CP/TR8 features RoHS-compliant "e3" matte-tin plating and is qualified for lead-free reflow soldering at 260°C for up to 10 seconds. Its thermosetting epoxy body (UL94V-0 rated) withstands repeated thermal cycling, making the 1N4751CP/TR8 suitable for modern high-reliability assembly processes without delamination or plating failure.
1N4751CP/TR8 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):
- 30 V
- Tolerance:
- ±2%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 40 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 22.8 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)
1N4751CP/TR8 FAQ
1.How can I place an order for 1N4751CP/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4751CP/TR8 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 1N4751CP/TR8 reliable?
The price and inventory of 1N4751CP/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4751CP/TR8 is usually 5 days.
3.What payment methods are accepted for 1N4751CP/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4751CP/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4751CP/TR8?
1N4751CP/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4751CP/TR8 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 1N4751CP/TR8?
For technical support, including 1N4751CP/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4751CP/TR8 requirements.
6.How does Aetrix verify that 1N4751CP/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N4751CP/TR8 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 1N4751CP/TR8 meets industry standards.
7.What is the process for return or replacement of 1N4751CP/TR8?
All 1N4751CP/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4751CP/TR8, 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 1N4751CP/TR8 part is unused and in its original packaging.
Return procedure for 1N4751CP/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4751CP/TR8 Tags
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