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Microchip Technology 1N4733P/TR8
- Part No.:
- 1N4733P/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4733P/TR8.pdf
- Description:
- DIODE ZENER 5.1V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:4,366
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Product details
Overview
1N4733P/TR8 from Microsemi is a 5.1 V, 1 W axial-lead Zener diode in DO-41 plastic package with ±5% voltage tolerance, 49 mA test current, and 7 Ω dynamic impedance at IZT. It regulates voltage in power supply reference, overvoltage protection, and voltage-clamping circuits across industrial and embedded systems.
For engineers reviewing the 1N4733P/TR8 datasheet, 1N4733P/TR8 pinout, 1N4733P/TR8 application, or 1N4733P/TR8 equivalent, key selection factors include its 5.1 V nominal Zener voltage, 1 W steady-state power rating at TL < 105°C, DO-41 mechanical compatibility, and TR8 tape-and-reel packaging for automated assembly.
Technical Context
This device operates in reverse breakdown to maintain stable output voltage under varying load and temperature conditions. Its 7 Ω Zener impedance at 49 mA ensures low regulation error, while the -65°C to +150°C operating range supports harsh-environment deployment.
The 1N4733P/TR8 uses silicon PN junction technology with cathode band marking, tin-lead or RoHS-compliant matte-tin plating, and UL94V-0 epoxy encapsulation. Thermal resistance is 45°C/W junction-to-lead (3/8" lead length) and 105°C/W junction-to-ambient on FR4 board.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 5.1 V ±5% at 49 mA - defines precise clamping threshold for reference and protection circuits |
| Power Dissipation | 1.0 W at TL < 105°C - enables continuous operation without heatsinking in standard leaded layouts |
| Dynamic Impedance (ZZT) | 7 Ω at IZT = 49 mA - ensures minimal output voltage variation under load transients |
| Reverse Current (IR) | <10 μA at VR = 1 V - guarantees low leakage in high-impedance bias networks |
| Max Regulator Current (IZM) | 178 mA at TA = 50°C - sets safe upper limit for sustained Zener conduction |
| Forward Voltage | ≤1.2 V at 200 mA - supports bidirectional transient suppression when used with series resistor |
| Thermal Resistance | 45°C/W junction-to-lead - allows accurate thermal modeling using standard lead-length assumptions |
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, void-free UL94V-0 epoxy body, weight 0.7 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Non-banded end | Connected to lower-potential node during Zener operation; forward conduction path |
| Cathode | Banded end | Connected to higher-potential node during regulation; defines Zener breakdown polarity |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered 1N4733A variant | Guarantees interoperability with legacy designs specifying 1N4733A, including mechanical and electrical interchangeability |
| Plastic P-suffix construction | Reduces thermal resistance vs. glass-body (G-suffix) equivalents, improving power handling in compact layouts |
| Moisture Sensitivity Level 1 | Eliminates dry-pack requirement and floor-life constraints for SMT-compatible handling and storage |
| RoHS-compliant e3 option | Enables compliance with environmental directives without derating or performance trade-offs |
| Tape-and-reel TR8 packaging | Supports high-speed pick-and-place assembly with EIA-296 standard carrier tape geometry |
Applications
| Power Supply Reference | Overvoltage Protection |
|---|---|
Use Scenario: Stabilizing feedback voltage in linear regulator circuits or ADC reference dividers. IC Role / Device Role / Timing Role: Precision voltage reference element providing stable 5.1 V基准 point. Use Value: Delivers ±5% tolerance and 7 Ω dynamic impedance to minimize output drift under line/load variations. | Use Scenario: Clamping transient spikes on DC rails in motor drives or sensor interfaces. IC Role / Device Role / Timing Role: Shunt overvoltage protector diverting excess energy to ground above 5.1 V. Use Value: Handles up to 178 mA continuous Zener current and withstands 1.0 W dissipation without derating at lead temperature <105°C. |
| Voltage-Level Translation | Signal Conditioning Clamp |
Use Scenario: Biasing op-amp inputs or setting logic thresholds in mixed-voltage systems. IC Role / Device Role / Timing Role: Passive level-shifter establishing fixed 5.1 V reference against variable supply rails. Use Value: Leverages low 10 μA reverse leakage at 1 V to avoid loading sensitive analog nodes. | Use Scenario: Limiting AC signal amplitude in audio preamps or sensor front-ends. IC Role / Device Role / Timing Role: Bidirectional clamp using forward (1.2 V) and reverse (5.1 V) conduction paths. Use Value: Provides symmetrical clipping with ≤1.2 V forward drop and sharp 5.1 V Zener knee for clean waveform shaping. |
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 TR8 tape-and-reel packaging; bulk or ammo pack only; identical electrical specs and DO-41 package | Not suitable for automated assembly requiring reel-fed feeders | Select 1N4733P/TR8 when SMT production line integration is required |
| MMBZ5222BS | SOT-23 surface-mount package; 5.1 V ±5%, 225 mW power rating; 100 Ω ZZT | Lower power handling and higher impedance limit use to low-current biasing, not rail clamping | Choose MMBZ5222BS only for space-constrained PCBs where 1 W dissipation is unnecessary |
Compared with 1N4733A and MMBZ5222BS, the 1N4733P/TR8 uniquely combines 1 W power capability, DO-41 through-hole compatibility, and TR8 reel packaging-making it optimal for industrial power supply references requiring robust thermal performance and automated manufacturing support.
Availability
1N4733P/TR8 is available at Aetrix Electronics and suitable for power supply reference, overvoltage protection, and voltage-level translation applications requiring stable component supply, long-term obsolescence management, and consistent parametric performance across production batches.
Supply support for 1N4733P/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 1N4733P/TR8 belongs to Microsemi's legacy 1N47xxAP Zener diode product line, engineered for precision voltage regulation in ruggedized power management and protection circuits where stability, thermal resilience, and JEDEC-standard interchangeability are critical.
FAQ
What is the Zener voltage tolerance of the 1N4733P/TR8?
The 1N4733P/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 1N4733P/TR8 maintains this specification across its rated operating temperature range of -65°C to +150°C, supporting reliable voltage reference design in thermally demanding environments.
Does the 1N4733P/TR8 require dry packing before PCB assembly?
No, the 1N4733P/TR8 is moisture sensitivity level (MSL) 1 per IPC/JEDEC J-STD-020B, meaning it does not absorb sufficient moisture to require dry packing or floor-life controls. This simplifies handling, storage, and reflow processes. The 1N4733P/TR8's plastic DO-41 package and UL94V-0 epoxy body inherently provide adequate moisture resistance for standard assembly workflows.
What is the maximum continuous Zener current for the 1N4733P/TR8 at 50°C ambient?
At TA = 50°C, the 1N4733P/TR8 supports a maximum regulator current (IZM) of 178 mA, derived from its 1.0 W power rating and 5.1 V Zener voltage. This value assumes mounting on an FR4 board with specified copper pad area and trace dimensions. Exceeding 178 mA risks thermal runaway; designers must apply appropriate derating curves when ambient or lead temperatures rise above 50°C.
How does the "P" and "TR8" in 1N4733P/TR8 affect its form factor and assembly?
The "P" suffix denotes plastic DO-41 packaging (vs. glass "G"), offering lower thermal resistance (45°C/W vs. higher for glass), while "TR8" specifies EIA-296-compliant tape-and-reel packaging with 8 mm carrier tape width-enabling direct use in high-speed pick-and-place machines. The 1N4733P/TR8 retains full mechanical and electrical compatibility with standard 1N4733A footprints, requiring no layout changes.
Can the 1N4733P/TR8 be used in bidirectional transient suppression?
Yes-the 1N4733P/TR8 conducts forward current up to 200 mA at ≤1.2 V, enabling use as a bidirectional clamp when paired with a series current-limiting resistor. In reverse, it regulates at 5.1 V; in forward, it limits to ~1.2 V. This dual-mode behavior makes the 1N4733P/TR8 suitable for AC signal conditioning or asymmetric surge protection where both polarities require limiting, provided power dissipation remains within 1.0 W limits.
1N4733P/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:
- ±10%
- 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)
1N4733P/TR8 FAQ
1.How can I place an order for 1N4733P/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4733P/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 1N4733P/TR8 reliable?
The price and inventory of 1N4733P/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4733P/TR8 is usually 5 days.
3.What payment methods are accepted for 1N4733P/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4733P/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4733P/TR8?
1N4733P/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4733P/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 1N4733P/TR8?
For technical support, including 1N4733P/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4733P/TR8 requirements.
6.How does Aetrix verify that 1N4733P/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N4733P/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 1N4733P/TR8 meets industry standards.
7.What is the process for return or replacement of 1N4733P/TR8?
All 1N4733P/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4733P/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 1N4733P/TR8 part is unused and in its original packaging.
Return procedure for 1N4733P/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4733P/TR8 Tags
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MM5Z5V1ST1G
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