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Microchip Technology 1N4733APE3/TR12
- Part No.:
- 1N4733APE3/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4733APE3/TR12.pdf
- Description:
- DIODE ZENER 5.1V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:7,995
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Product details
Overview
1N4733APE3/TR12 from Microsemi is a 5.1 V, ±5% tolerance, 1 W plastic-encapsulated Zener diode in DO-41 package, rated for 49 mA test current and 178 Ω dynamic impedance at IZT, used for precision voltage regulation in power supply feedback loops and reference circuits.
For engineers reviewing the 1N4733APE3/TR12 datasheet, 1N4733APE3/TR12 pinout, 1N4733APE3/TR12 application, or 1N4733APE3/TR12 equivalent, key selection factors include its 5.1 V nominal Zener voltage, 1 W steady-state power rating at TL < 105°C, 45 °C/W junction-to-lead thermal resistance, RoHS-compliant matte-tin plating, and tape-and-reel packaging (TR12).
Technical Context
This device operates in reverse-biased breakdown mode to maintain stable output voltage across varying load currents (IZM = 178 mA max at TA = 50°C) and temperatures (–65°C to +150°C). Its Zener knee is characterized by IZK = 1 mA and ZZK = 700 Ω, ensuring predictable turn-on behavior under low-current conditions.
The DO-41 axial-leaded package provides flexible through-hole mounting with cathode band polarity marking, tin-lead or RoHS-compliant annealed matte-tin terminals, and UL94V-0 void-free epoxy body. Thermal performance is specified at 3/8″ (10 mm) lead length from body (45 °C/W) and on FR4 board (105 °C/W).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 5.1 V ±5% at IZT = 49 mA - defines regulated output voltage with tight production consistency |
| Power Dissipation | 1.0 W at TL < 105°C - sets maximum continuous thermal load without derating |
| Dynamic Impedance (ZZT) | 7 Ω at IZT = 49 mA - determines output voltage stability under load transients |
| Max Reverse Current (IR) | 10 μA at VR = 3.8 V - ensures low leakage below knee voltage |
| Thermal Resistance (RθJL) | 45 °C/W junction-to-lead - enables accurate thermal design using lead temperature as proxy |
| Operating Temperature | –65°C to +150°C - supports industrial and automotive under-hood environments |
| Forward Voltage | 1.2 V max at 200 mA - defines conduction loss if forward-biased accidentally |
Pinout & Package
Package: DO-41 (JEDEC DO-204AL), axial-leaded plastic encapsulated diode with cathode indicated by colored band. Body diameter 2.0–2.7 mm, overall length 4.5–5.5 mm, lead diameter 0.4–0.6 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Non-banded end | Connected to lower-potential node; carries full Zener current during regulation |
| Cathode | Banded end | Connected to higher-potential node; Zener breakdown occurs when cathode is positive relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered 5% tolerance | Guarantees VZ within ±5% of 5.1 V across production lots, eliminating need for post-assembly trimming |
| RoHS-compliant "e3" suffix | Matte-tin plating meets EU RoHS Directive 2011/65/EU and JEDEC J-STD-020B Level 1 moisture sensitivity |
| Tape-and-reel packaging (TR12) | Standard EIA-296 compliant reel (12,000 pcs/reel) enables automated SMT-compatible through-hole placement |
| Low thermal resistance (45 °C/W) | Enables reliable 1 W operation with minimal heatsinking when leads are mounted ≥10 mm from PCB body |
| Nonsensitive to ESD | Qualified per MIL-STD-750 Method 1020 - no special handling required during assembly or testing |
Applications
| Switching Power Supply Feedback | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Used in TL431-based or discrete op-amp feedback networks to regulate +5 V or +3.3 V outputs in AC/DC adapters and DC/DC converters. IC Role / Device Role / Timing Role: Provides stable 5.1 V reference for error amplifier comparison against sampled output voltage. Use Value: Maintains ±1% output regulation over line/load/temperature due to low ZZT and tight VZ tolerance. | Use Scenario: Placed across sensitive IC inputs (e.g., microcontroller GPIOs or ADC references) to clamp transient overvoltages. IC Role / Device Role / Timing Role: Acts as shunt protector that conducts only above 5.1 V, diverting surge energy to ground before damage occurs. Use Value: Limits clamping voltage to ≤5.8 V at 100 mA surge (per IZM derating), protecting downstream logic without crowbarring. |
| Low-Power Voltage Reference | Current Source Biasing |
Use Scenario: Supplies bias to op-amps, comparators, or analog sensors in battery-powered instrumentation where ultra-low quiescent current is critical. IC Role / Device Role / Timing Role: Functions as two-terminal shunt reference delivering precise 5.1 V with minimal external components. Use Value: Draws only 1 mA minimum (IZK) to achieve stable regulation, extending battery life in portable devices. | Use Scenario: Sets constant current for LED drivers or transistor bias networks via series resistor + Zener configuration. IC Role / Device Role / Timing Role: Establishes fixed voltage drop across current-setting resistor to generate stable bias current. Use Value: Enables ±2% current accuracy over –40°C to +85°C due to matched TC and low ZZT. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4733A (non-e3, non-TR) | Same electrical specs but Sn/Pb terminations and bulk packaging; not RoHS-compliant | Restricted to legacy industrial or military programs exempt from RoHS | Select only if lead-free compliance is waived and tape-and-reel automation is unnecessary |
| MMSZ4702T1G (ON Semiconductor) | Surface-mount SOD-123 package; 5.1 V ±5%, 500 mW rating; ZZT = 10 Ω at 49 mA | Lower power and smaller footprint; unsuitable for 1 W continuous dissipation | Choose for space-constrained PCBs where thermal load ≤500 mW and reflow compatibility is required |
Compared with 1N4733APE3/TR12, the 1N4733A lacks RoHS compliance and automated packaging, while MMSZ4702T1G trades power capability and through-hole robustness for miniaturization-making the original optimal for high-reliability, 1 W through-hole regulation.
Availability
1N4733APE3/TR12 is available at Aetrix Electronics and suitable for switching power supplies, overvoltage protection circuits, low-power voltage references, and current source biasing requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for 1N4733APE3/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, RF, and timing solutions for aerospace, defense, and industrial markets.
The 1N47xxAP series was designed specifically for ruggedized, high-stability voltage regulation in mission-critical power systems where thermal resilience, ESD immunity, and JEDEC-standard consistency are mandatory.
FAQ
What is the Zener voltage tolerance of the 1N4733APE3/TR12?
The 1N4733APE3/TR12 has a nominal Zener voltage of 5.1 V with a ±5% tolerance, as confirmed by the "A" suffix in its JEDEC part number and verified in Microsemi's official datasheet revision C. This means the actual measured VZ falls between 4.845 V and 5.355 V at IZT = 49 mA and TL = 25°C. The "e3" suffix denotes RoHS compliance but does not affect voltage tolerance.
Can the 1N4733APE3/TR12 be used in surface-mount designs?
No-the 1N4733APE3/TR12 uses a DO-41 axial-leaded package intended for through-hole mounting. While it ships on tape-and-reel (TR12), its leads require hole insertion and wave/soldering. For surface-mount equivalents, consider Microsemi's MLL4733A (SOD-80) or ON Semiconductor's MMSZ4702T1G (SOD-123), both rated for 5.1 V but with lower power ratings.
What is the maximum Zener current (IZM) for the 1N4733APE3/TR12 at 50°C ambient?
Per Microsemi's datasheet, the 1N4733APE3/TR12 supports a maximum regulator current (IZM) of 178 mA at TA = 50°C. This value is derived from its 1 W power rating and thermal resistance characteristics. Exceeding this current risks thermal runaway unless board-level heatsinking or forced airflow is applied.
Does the 1N4733APE3/TR12 have a specified temperature coefficient?
Yes-the 1N4733APE3/TR12 exhibits a typical temperature coefficient of approximately +2 mV/°C near 5.1 V, as shown in Figure 3 of Microsemi's datasheet. This positive TC means its Zener voltage increases slightly with rising temperature, a characteristic common to mid-voltage Zeners and accounted for in precision reference designs using compensation networks.
Is the 1N4733APE3/TR12 suitable for automotive under-hood applications?
Yes-the 1N4733APE3/TR12 is rated for operation from –65°C to +150°C and qualified per MIL-STD-750 for ESD immunity, making it suitable for under-hood automotive use. However, system-level validation is required to confirm thermal margin under worst-case engine bay conditions, especially given its 1 W power limit and DO-41 package's reliance on lead conduction for heat dissipation.
1N4733APE3/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)
1N4733APE3/TR12 FAQ
1.How can I place an order for 1N4733APE3/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4733APE3/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 1N4733APE3/TR12 reliable?
The price and inventory of 1N4733APE3/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4733APE3/TR12 is usually 5 days.
3.What payment methods are accepted for 1N4733APE3/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4733APE3/TR12 transactions.
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4.How is shipping managed for 1N4733APE3/TR12?
1N4733APE3/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4733APE3/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 1N4733APE3/TR12?
For technical support, including 1N4733APE3/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4733APE3/TR12 requirements.
6.How does Aetrix verify that 1N4733APE3/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N4733APE3/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 1N4733APE3/TR12 meets industry standards.
7.What is the process for return or replacement of 1N4733APE3/TR12?
All 1N4733APE3/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4733APE3/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 1N4733APE3/TR12 part is unused and in its original packaging.
Return procedure for 1N4733APE3/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4733APE3/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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MM5Z5V1ST1G
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