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Microchip Technology 1N4733CP/TR12
- Part No.:
- 1N4733CP/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4733CP/TR12.pdf
- Description:
- DIODE ZENER 5.1V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:7,251
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Product details
Overview
1N4733CP/TR12 from Microsemi is a 5.1 V, 1 W axial-lead silicon Zener diode in DO-41 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/TR12 datasheet, 1N4733CP/TR12 pinout, 1N4733CP/TR12 application, or 1N4733CP/TR12 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 plating.
Technical Context
This device operates in reverse breakdown to maintain stable output voltage across varying load and line conditions. It features a sharp knee in the Zener characteristic curve, verified by dual-point impedance measurement per MicroNote 202, and exhibits low temperature coefficient near zero at 5.1 V.
Designed for through-hole mounting on FR4 PCBs with 1 oz copper, it delivers 1.0 W steady-state power at TL < 105 °C (3/8″ lead length) or TA < 45 °C, with thermal resistance of 105 °C/W junction-to-ambient under defined pad layout (4 mm² copper, 1 mm trace width).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 5.1 V ±5% at IZT = 49 mA - defines nominal regulation point with tight production control |
| Power Dissipation | 1.0 W at 25 °C ambient - sets maximum continuous DC power handling before thermal derating |
| Dynamic Impedance | 7 Ω at IZT = 49 mA - determines output voltage variation under load transients |
| Reverse Leakage | <10 µA at VR = 1 V - ensures minimal standby current in high-impedance bias networks |
| Surge Current (ISM) | 890 mA (½-sine, 1/120 s) - supports transient overvoltage clamping without failure |
| Thermal Resistance | 45 °C/W junction-to-lead - enables reliable heat transfer via axial leads to PCB copper |
| Operating Temp | –65 °C to +150 °C - supports industrial and automotive under-hood environments |
Pinout & Package
DO-41 (DO-204AL) plastic axial-leaded package with cathode indicated by color band; terminals are anode and cathode, with banded end positive during Zener operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference | Connected to circuit ground or lower potential node when regulating |
| Cathode | Zener breakdown terminal / regulation output | Connected to regulated voltage rail; banded end must be at higher potential than anode |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC 1N4733A registration | Guarantees standardized electrical behavior and interchangeability across qualified suppliers |
| Plastic P-suffix construction | Reduces thermal resistance vs. glass-body variants, improving power handling in compact layouts |
| Moisture sensitivity Level 1 | Eliminates dry-pack requirement and floor-life constraints for SMT reflow compatibility |
| RoHS-compliant "e3" suffix | Meets EU Directive 2011/65/EU with annealed matte-tin plating, solderable per MIL-STD-750 |
| Nonsensitive to ESD | Withstands >4 kV HBM per MIL-STD-750 Method 1020 without parameter shift or failure |
Applications
| Power Supply Reference | Overvoltage Protection |
|---|---|
Use Scenario: Stable 5.1 V reference for linear regulator feedback or ADC reference divider. IC Role / Device Role / Timing Role: Voltage reference element providing fixed bias point independent of input ripple. Use Value: Maintains ±5% regulation over 10–100 mA operating range and –65 °C to +150 °C, enabling single-supply analog designs. | Use Scenario: Clamping transient spikes on 5 V logic rails or sensor inputs. IC Role / Device Role / Timing Role: Shunt protection device diverting excess energy to ground above 5.1 V threshold. Use Value: Withstands 890 mA surge pulses while limiting voltage to ≤5.8 V, protecting downstream CMOS inputs. |
| Signal Level Shifting | Current Source Biasing |
Use Scenario: Generating precise offset voltages in op-amp summing networks. IC Role / Device Role / Timing Role: Fixed-voltage drop element establishing DC bias points in analog signal chains. Use Value: Low 7 Ω dynamic impedance minimizes voltage shift under 1–10 mA bias currents, preserving signal fidelity. | Use Scenario: Setting constant current in LED driver or transistor bias circuits. IC Role / Device Role / Timing Role: Stable voltage source enabling predictable emitter/base bias in current mirror configurations. Use Value: Tight 5% VZ tolerance and low tempco ensure ±2% current stability across temperature in discrete bias networks. |
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 indicates glass-body construction; higher thermal resistance (≈60 °C/W) | Less suitable for high-power-density PCBs requiring efficient lead-based heat sinking | Select 1N4733CP/TR12 when DO-41 plastic package and lower RθJL are required |
| BZX55-C5V1 | Same VZ and tolerance but TO-92 package; 500 mW rating; different thermal profile | Lower power handling limits use in >500 mW regulation or surge scenarios | Choose BZX55-C5V1 only for space-constrained low-power biasing where leaded DO-41 is impractical |
Compared with 1N4733A and BZX55-C5V1, the 1N4733CP/TR12 offers superior thermal performance in axial-leaded form factor and full 1 W capability, making it optimal for industrial power supplies where reliability under sustained load and transient stress is critical.
Availability
1N4733CP/TR12 is available at Aetrix Electronics and suitable for power supply reference, overvoltage protection, and analog biasing applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for 1N4733CP/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 and mixed-signal components for aerospace, defense, and industrial markets.
The 1N4733CP/TR12 belongs to Microsemi's legacy 1N47xxAP Zener series, engineered for robust voltage regulation in harsh-environment power systems where stability, surge resilience, and long-term parametric consistency are essential.
FAQ
What is the Zener voltage tolerance of the 1N4733CP/TR12?
The 1N4733CP/TR12 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 guaranteed at 49 mA test current and 25 °C lead temperature, and applies across the full operating temperature range of –65 °C to +150 °C per Microsemi's published specifications.
Does the 1N4733CP/TR12 require dry packing before PCB assembly?
No, the 1N4733CP/TR12 is moisture sensitivity Level 1 per IPC/JEDEC J-STD-020B, meaning it has no floor-life limitation and does not require dry packing or baking prior to reflow soldering. Its void-free epoxy body and RoHS-compliant matte-tin plating ensure robust solderability without preconditioning.
What is the maximum surge current rating for the 1N4733CP/TR12?
The 1N4733CP/TR12 is rated for a maximum non-repetitive reverse surge current (ISM) of 890 mA, measured using a ½-sine wave pulse of 1/120 second duration at 25 °C ambient. This rating supports transient clamping in power supply input stages and protects downstream circuitry from short-duration overvoltage events.
How does the "P" suffix in 1N4733CP/TR12 affect thermal performance?
The "P" suffix denotes plastic encapsulation, which reduces thermal resistance to 45 °C/W junction-to-lead (vs. ~60 °C/W for glass-body "G" variants). This allows the 1N4733CP/TR12 to sustain full 1.0 W dissipation at higher ambient temperatures and improves reliability in thermally constrained layouts.
Is the 1N4733CP/TR12 compatible with lead-free reflow processes?
Yes, the 1N4733CP/TR12 features RoHS-compliant annealed matte-tin plating and is rated for solder temperatures up to 260 °C for 10 seconds, fully supporting standard lead-free reflow profiles. Its UL94V-0 epoxy body remains stable under repeated thermal cycling without delamination or parameter drift.
1N4733CP/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):
- 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/TR12 FAQ
1.How can I place an order for 1N4733CP/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4733CP/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 1N4733CP/TR12 reliable?
The price and inventory of 1N4733CP/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4733CP/TR12 is usually 5 days.
3.What payment methods are accepted for 1N4733CP/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4733CP/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4733CP/TR12?
1N4733CP/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4733CP/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 1N4733CP/TR12?
For technical support, including 1N4733CP/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4733CP/TR12 requirements.
6.How does Aetrix verify that 1N4733CP/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N4733CP/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 1N4733CP/TR12 meets industry standards.
7.What is the process for return or replacement of 1N4733CP/TR12?
All 1N4733CP/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4733CP/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 1N4733CP/TR12 part is unused and in its original packaging.
Return procedure for 1N4733CP/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4733CP/TR12 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
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
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MMSZ4682T1G
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
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BZT52C3V6LP-7
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SMAZ12-13-F
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