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Microchip Technology 1N4733AP/TR12
- Part No.:
- 1N4733AP/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4733AP/TR12.pdf
- Description:
- DIODE ZENER 5.1V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:3,007
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Product details
Overview
1N4733AP/TR12 from Microsemi is a 5.1 V, ±5% tolerance, 1.0 W axial-lead silicon Zener diode in DO-41 package, designed for precision voltage regulation in power supply reference and overvoltage protection circuits across industrial and embedded systems.
For engineers reviewing the 1N4733AP/TR12 datasheet, 1N4733AP/TR12 pinout, 1N4733AP/TR12 application, or 1N4733AP/TR12 equivalent, key selection criteria include Zener voltage (5.1 V), test current (49 mA), dynamic impedance (7 Ω), maximum regulator current (178 mA), and thermal resistance (45 °C/W junction-to-lead).
Technical Context
This Zener operates in reverse breakdown to maintain stable output voltage under varying load and temperature conditions. It features a sharp knee at IZK = 1.0 mA with ZZK ≤ 500 Ω and supports continuous DC regulation up to 178 mA at TL < 105 °C.
Its DO-41 plastic package delivers 45 °C/W junction-to-lead thermal resistance at 3/8" lead length and meets IPC/JEDEC J-STD-020B Level 1 moisture sensitivity-no dry pack required. Polarity is marked by cathode band; regulation requires cathode-positive bias.
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 TL ≤ 105 °C - sets maximum steady-state thermal load on leads |
| Dynamic Impedance (ZZT) | 7 Ω at IZT = 49 mA - determines output voltage stability under small-signal AC ripple |
| Maximum Regulator Current (IZM) | 178 mA at TA = 50 °C - limits usable DC current before thermal runaway |
| Thermal Resistance (RθJL) | 45 °C/W junction-to-lead - enables thermal design with standard lead mounting |
| Reverse Leakage (IR) | 10 μA max at VR = 1 V - ensures low standby power loss in high-impedance bias networks |
| Forward Voltage | 1.2 V max at IF = 200 mA - defines conduction drop during forward-biased fault conditions |
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, solderable per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference node for Zener operation | Connected to lower-potential side of regulated circuit; carries full Zener current when cathode is biased positive |
| Cathode | Regulated output node | Banded end; must be held positive relative to anode to enter breakdown; provides stable 5.1 V reference |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered 5% tolerance | Guarantees VZ between 4.85 V and 5.36 V at 49 mA - eliminates need for post-production trimming |
| Low dynamic impedance | 7 Ω at rated test current - minimizes output voltage variation under load transients |
| Level 1 moisture sensitivity | No dry pack required per J-STD-020B - reduces handling cost and assembly delay |
| Nonsensitive to ESD | Qualified per MIL-STD-750 Method 1020 - allows safe handling without special grounding protocols |
| Plastic P-suffix construction | Lower thermal resistance vs. glass-body G-suffix variants - improves power handling in compact layouts |
Applications
| Power Supply Reference | Overvoltage Clamp |
|---|---|
Use Scenario: Stabilizing feedback voltage in linear regulator ICs or discrete transistor-based regulators. IC Role / Device Role / Timing Role: Provides precise 5.1 V reference for error amplifier input or shunt regulation path. Use Value: Maintains ±5% output accuracy over -65 °C to +150 °C ambient, enabling reliable operation in unheated enclosures. | Use Scenario: Protecting microcontroller I/O pins from transient surges exceeding 5.1 V. IC Role / Device Role / Timing Role: Shunts excess current to ground when input voltage exceeds Zener breakdown threshold. Use Value: Limits clamping voltage to ≤5.36 V with 7 Ω dynamic impedance, reducing risk of latch-up in 5 V logic interfaces. |
| Voltage Monitor Threshold | Current Source Bias |
Use Scenario: Detecting undervoltage conditions in battery-powered sensor nodes. IC Role / Device Role / Timing Role: Serves as stable reference for comparator input to trigger reset or alert at 5.1 V threshold. Use Value: Delivers repeatable trip point with <10 μA leakage at 1 V reverse bias, minimizing false triggers in low-power sleep modes. | Use Scenario: Setting constant base current for BJT current mirrors in analog front-ends. IC Role / Device Role / Timing Role: Acts as stable voltage source across emitter resistor to define collector current. Use Value: Enables <±0.5% current matching across temperature due to low ZZT and predictable VZ drift. |
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 TR12 tape-and-reel packaging; bulk or ammo pack only | Lacks standardized reel delivery for automated SMT placement | Select 1N4733AP/TR12 for pick-and-place compatibility; choose 1N4733A for manual prototyping or low-volume hand assembly |
| BZX55C5V1 | Same 5.1 V ±5%, but 500 mW rating and DO-35 package; higher ZZT = 60 Ω | Lower power handling and inferior regulation stability under load variation | Use BZX55C5V1 only where space constraints prohibit DO-41 or power demand stays below 500 mW |
Compared with 1N4733A and BZX55C5V1, the 1N4733AP/TR12 offers superior thermal performance (45 °C/W vs. ~100 °C/W), higher power margin (1.0 W vs. 0.5 W), and factory-verified tape-and-reel compliance-critical for high-yield automated manufacturing of industrial power modules.
Availability
1N4733AP/TR12 is available at Aetrix Electronics and suitable for power supply reference, overvoltage clamp, and voltage monitor threshold applications requiring stable component supply and JEDEC-standardized Zener performance.
Supply support for 1N4733AP/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 1N4733AP/TR12 belongs to Microsemi's legacy 1N47xxAP Zener series, engineered for robust voltage regulation in harsh environments where long-term stability, ESD immunity, and moisture resilience are mandatory.
FAQ
What is the Zener voltage tolerance of the 1N4733AP/TR12?
The 1N4733AP/TR12 has a nominal Zener voltage of 5.1 V with a ±5% tolerance, meaning its actual breakdown voltage falls between 4.85 V and 5.36 V when tested at 49 mA and 25 °C lead temperature. This tolerance is confirmed by JEDEC registration and applies to all units bearing the "A" suffix in the part number, including the 1N4733AP/TR12.
Does the 1N4733AP/TR12 require dry packing before PCB assembly?
No, the 1N4733AP/TR12 does not require dry packing. Its DO-41 plastic package is rated IPC/JEDEC J-STD-020B Level 1 for moisture sensitivity, meaning it can be stored and assembled without baking or humidity-controlled handling. This simplifies logistics and reduces assembly risk compared to higher-level moisture-sensitive devices.
What is the maximum continuous current the 1N4733AP/TR12 can regulate at room temperature?
The 1N4733AP/TR12 supports a maximum regulator current (IZM) of 178 mA at TA = 50 °C. At 25 °C ambient, derating rules allow up to ~200 mA if lead temperature remains below 105 °C. Exceeding this current risks thermal runaway due to the device's 1.0 W power limit and 45 °C/W junction-to-lead thermal resistance.
How is polarity marked on the 1N4733AP/TR12?
The 1N4733AP/TR12 uses a cathode band to indicate polarity: the banded end is the cathode and must be biased positive relative to the anode to achieve Zener regulation. Forward conduction occurs when the anode is positive, with VF ≤ 1.2 V at 200 mA - a specification verified in Microsemi's official datasheet for the 1N4733AP/TR12.
Is the 1N4733AP/TR12 RoHS compliant?
Yes, the 1N4733AP/TR12 is RoHS compliant. The "e3" designation in Microsemi's documentation confirms annealed matte-tin plating and lead-free construction meeting EU Directive 2011/65/EU. This compliance is inherent to the part number as shipped by Aetrix Electronics and requires no additional ordering suffix.
1N4733AP/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:
- ±5%
- 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)
1N4733AP/TR12 FAQ
1.How can I place an order for 1N4733AP/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4733AP/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 1N4733AP/TR12 reliable?
The price and inventory of 1N4733AP/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4733AP/TR12 is usually 5 days.
3.What payment methods are accepted for 1N4733AP/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4733AP/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4733AP/TR12?
1N4733AP/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4733AP/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 1N4733AP/TR12?
For technical support, including 1N4733AP/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4733AP/TR12 requirements.
6.How does Aetrix verify that 1N4733AP/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N4733AP/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 1N4733AP/TR12 meets industry standards.
7.What is the process for return or replacement of 1N4733AP/TR12?
All 1N4733AP/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4733AP/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 1N4733AP/TR12 part is unused and in its original packaging.
Return procedure for 1N4733AP/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4733AP/TR12 Tags
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Diodes Incorporated
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