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Microchip Technology 1N4733CP/TR8
- Part No.:
- 1N4733CP/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4733CP/TR8.pdf
- Description:
- DIODE ZENER 5.1V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:3,737
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Product details
Overview
1N4733CP/TR8 from Microsemi is a 5.1 V, 1 W axial-lead silicon Zener diode in DO-41 plastic package with ±5% voltage tolerance, 49 mA test current, and 7 Ω dynamic impedance at IZT, used for precision voltage regulation in power supply reference and overvoltage protection circuits.
For engineers reviewing the 1N4733CP/TR8 datasheet, 1N4733CP/TR8 pinout, 1N4733CP/TR8 application, or 1N4733CP/TR8 equivalent, key selection criteria include Zener voltage accuracy, thermal resistance (45 °C/W junction-to-lead), surge current rating (890 mA), reverse leakage (<10 µA at 1 V), and RoHS-compliant matte-tin termination.
Technical Context
This discrete Zener diode operates in reverse breakdown to maintain stable output voltage across varying load and line conditions. It delivers regulated 5.1 V with 7 Ω dynamic impedance at 49 mA test current and exhibits low knee impedance (500 Ω at 0.25 mA) for sharp turn-on characteristics.
Rated for 1.0 W dissipation at 25 °C with linear derating above 105 °C lead temperature, it supports operation from –65 °C to +150 °C and features moisture sensitivity level 1 per J-STD-020B-no dry pack required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 5.1 V ±5% at 49 mA - defines nominal regulation point with tight production control |
| Power Dissipation | 1.0 W at TL ≤ 105 °C - sets maximum continuous thermal load on lead-mounted PCB layout |
| Dynamic Impedance | 7 Ω at IZT = 49 mA - determines output voltage stability under dynamic load changes |
| Reverse Leakage | <10 µA at VR = 1 V - ensures minimal quiescent current in standby regulation paths |
| Surge Current (ISM) | 890 mA (½-sine, 1/120 s) - enables transient overvoltage clamping without failure |
| Thermal Resistance | 45 °C/W junction-to-lead (3/8″ lead length) - guides heatsinking via lead conduction |
| Operating Temperature | –65 °C to +150 °C - supports industrial and automotive under-hood environments |
Pinout & Package
DO-41 (DO-204AL) plastic axial-lead package with cathode indicated by colored band; leads are tin-lead or RoHS-compliant matte-tin plated, solderable per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Non-banded end | Connected to lower-potential node; forward voltage ≤1.2 V @ 200 mA |
| Cathode | Banded end | Connected to higher-potential node during Zener operation; defines regulation polarity |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered construction | Fully compliant with 1N4733A baseline spec - ensures cross-manufacturer interchangeability |
| Plastic P-suffix package | Lower thermal resistance vs. glass-body G-suffix variants - improves power handling in compact layouts |
| RoHS-compliant "e3" option | Matte-tin plating meets EU Directive 2011/65/EU - eliminates lead in final assembly |
| Level 1 moisture sensitivity | No dry-pack or baking required before SMT/reflow - reduces manufacturing overhead |
| Nonsensitive to ESD | Qualified per MIL-STD-750 Method 1020 - withstands handling without special precautions |
Applications
| Power Supply Reference | Overvoltage Clamp |
|---|---|
Use Scenario: Stabilizing feedback voltage in linear regulator ICs or op-amp-based shunt regulators. IC Role / Device Role / Timing Role: Provides precise 5.1 V reference node independent of input ripple or load variation. Use Value: Enables ±1% output regulation accuracy in 78L05-based supplies using minimal external components. | Use Scenario: Protecting microcontroller I/O pins from ESD or inductive kickback transients. IC Role / Device Role / Timing Role: Shunts excess energy to ground when voltage exceeds 5.1 V, clamping peak excursion. Use Value: Limits transient voltage to safe levels below 6 V, preventing latch-up in 5 V logic interfaces. |
| Voltage Monitor Threshold | Current Source Bias |
Use Scenario: Detecting brown-out conditions in battery-powered instrumentation. IC Role / Device Role / Timing Role: Serves as fixed-voltage comparator input threshold in discrete reset circuitry. Use Value: Triggers system reset at 5.1 V ±5%, accommodating battery discharge curve tolerances. | Use Scenario: Establishing stable bias current for LED drivers or transistor amplifiers. IC Role / Device Role / Timing Role: Sets constant current through series resistor using Zener-regulated voltage drop. Use Value: Delivers 10 mA bias with <±2% drift over –40 °C to +85 °C ambient range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4733A | No "P" suffix (glass body), higher thermal resistance (105 °C/W junction-to-ambient) | Less suitable for high-power-density PCBs requiring lead-conducted cooling | Select 1N4733CP/TR8 when DO-41 plastic package and lower RθJL are required |
| BZX55C5V1 | Same 5.1 V/5% spec but TO-92 package, 500 mW rating, 60 Ω ZZT | Lower power handling and higher impedance limit use in high-current regulation | Choose BZX55C5V1 only for space-constrained low-power signal-level references |
Compared with 1N4733A and BZX55C5V1, the 1N4733CP/TR8 offers superior thermal performance in lead-mounted configurations and higher surge current capability, making it preferred for industrial power rail supervision where reliability under transient stress is critical.
Availability
1N4733CP/TR8 is available at Aetrix Electronics and suitable for power supply reference, overvoltage clamp, and voltage monitor threshold applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for 1N4733CP/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 and mixed-signal components for aerospace, defense, and industrial markets.
The 1N4733CP/TR8 belongs to Microsemi's legacy 1N47xxAP Zener diode product line, engineered for robust voltage regulation in harsh-environment power systems where thermal stability and surge resilience are essential.
FAQ
What is the Zener voltage tolerance for 1N4733CP/TR8?
The 1N4733CP/TR8 has a nominal Zener voltage of 5.1 V with a tolerance of ±5%, as indicated by the "A" suffix in its JEDEC designation. This tolerance is verified at 49 mA test current and 25 °C lead temperature. The "P" suffix confirms plastic DO-41 packaging, and "TR8" denotes tape-and-reel packaging per EIA-296 standard. This tolerance ensures predictable regulation in commercial and industrial power supply designs.
Does 1N4733CP/TR8 require dry packing before PCB assembly?
No, the 1N4733CP/TR8 is rated at Moisture Sensitivity Level 1 per IPC/JEDEC J-STD-020B, meaning it does not absorb sufficient moisture during normal factory handling to require dry packing or baking prior to reflow soldering. Its void-free epoxy body and Level 1 classification eliminate moisture-related popcorning risks, simplifying manufacturing flow for high-volume PCB assembly.
What is the maximum surge current rating for 1N4733CP/TR8?
The 1N4733CP/TR8 is rated for a maximum non-repetitive surge current (ISM) of 890 mA, measured using a ½-sine wave pulse of 1/120 second duration at 25 °C ambient. This rating enables reliable transient suppression in power rails subject to inductive switching or ESD events. The surge capability is directly tied to its 1 W power rating and low thermal resistance, distinguishing it from lower-rated Zeners like the BZX55 series.
How does the thermal resistance of 1N4733CP/TR8 compare to glass-body variants?
The 1N4733CP/TR8 has a junction-to-lead thermal resistance of 45 °C/W at 3/8″ (10 mm) lead length, significantly lower than the 105 °C/W junction-to-ambient rating typical of glass-body 1N4733A variants. This plastic P-suffix construction improves heat conduction through leads, allowing higher sustained power dissipation in lead-mounted PCB layouts without additional heatsinking.
Is 1N4733CP/TR8 RoHS compliant?
Yes, the "e3" suffix in the full ordering code (1N4733CP/TR8-e3) indicates RoHS compliance with EU Directive 2011/65/EU. The device uses annealed matte-tin plating instead of tin-lead terminations, and its transfer-molded epoxy body meets UL94V-0 flammability requirements. Compliance is verified per Microsemi's published qualification data and applies to all units shipped under this part number revision.
1N4733CP/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):
- 5.1 V
- Tolerance:
- ±2%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 7 Ohms
- Current - Reverse Leakage @ Vr:
- 10 µA @ 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)
1N4733CP/TR8 FAQ
1.How can I place an order for 1N4733CP/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4733CP/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 1N4733CP/TR8 reliable?
The price and inventory of 1N4733CP/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4733CP/TR8 is usually 5 days.
3.What payment methods are accepted for 1N4733CP/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4733CP/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4733CP/TR8?
1N4733CP/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4733CP/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 1N4733CP/TR8?
For technical support, including 1N4733CP/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4733CP/TR8 requirements.
6.How does Aetrix verify that 1N4733CP/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N4733CP/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 1N4733CP/TR8 meets industry standards.
7.What is the process for return or replacement of 1N4733CP/TR8?
All 1N4733CP/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4733CP/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 1N4733CP/TR8 part is unused and in its original packaging.
Return procedure for 1N4733CP/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4733CP/TR8 Tags
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MMBZ5240B-7-F
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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onsemi
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MM5Z5V1ST1G
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SMAJ4744A-TP
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