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Microchip Technology 1N4739CPE3/TR12
- Part No.:
- 1N4739CPE3/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4739CPE3/TR12.pdf
- Description:
- DIODE ZENER 9.1V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:6,078
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Product details
Overview
1N4739CPE3/TR12 from Microsemi is a 9.1 V, ±2% tolerance, 1 W plastic-encapsulated Zener diode in DO-41 package, rated for 28 mA test current, 5 Ω dynamic impedance at IZT, and 7 μA reverse leakage at 7.2 V, used for precision voltage regulation in power supply feedback loops and reference circuits.
For engineers reviewing the 1N4739CPE3/TR12 datasheet, 1N4739CPE3/TR12 pinout, 1N4739CPE3/TR12 application, or 1N4739CPE3/TR12 equivalent, key selection criteria include Zener voltage tolerance (±2%), thermal resistance (45 °C/W junction-to-lead), surge current rating (500 mA), RoHS-compliant matte-tin plating, and tape-and-reel packaging (TR12).
Technical Context
This discrete Zener diode operates in reverse breakdown to maintain stable output voltage across varying load and line conditions. It delivers regulated 9.1 V with ±2% initial tolerance (C suffix), 5 Ω dynamic impedance at 28 mA test current, and exhibits low knee impedance (100 Ω at 0.25 mA) for sharp regulation onset.
Designed for axial-lead mounting on FR4 PCBs, it features 45 °C/W junction-to-lead thermal resistance at 10 mm lead length, supports steady-state 1.0 W dissipation below 105 °C lead temperature, and complies with IPC/JEDEC J-STD-020B Level 1 moisture sensitivity-no dry pack required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 9.1 V ±2% at 28 mA - ensures tight regulation stability in feedback networks |
| Power Dissipation | 1.0 W at TL < 105 °C - defines maximum continuous thermal load on leads |
| Dynamic Impedance (ZZT) | 5 Ω at IZT = 28 mA - minimizes output voltage variation under load transients |
| Reverse Leakage Current | 7 μA at VR = 7.2 V - guarantees low quiescent error in high-impedance references |
| Surge Current (ISM) | 500 mA (½-sine, 1/120 s) - withstands brief overvoltage events without degradation |
| Thermal Resistance | 45 °C/W junction-to-lead - enables predictable thermal design with standard lead length |
| Operating Temperature | –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 unmarked anode and banded cathode; polarity must be observed - cathode positive for Zener operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reverse-biased input terminal | Connected to lower-potential node; carries reverse current during regulation |
| Cathode (banded end) | Zener output terminal | Provides stabilized 9.1 V reference; must be held at higher potential than anode |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance (C suffix) | Enables high-accuracy voltage references without post-calibration |
| RoHS-compliant matte-tin plating (e3 suffix) | Ensures solderability and reliability per modern environmental compliance standards |
| Tape-and-reel packaging (TR12 suffix) | Supports automated SMT-compatible axial insertion and consistent feeding in production |
| Moisture sensitivity Level 1 | Eliminates bake-out requirement before assembly, reducing manufacturing overhead |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Reduces handling precautions and ESD protection circuitry in final systems |
Applications
| Switching Power Supply Feedback | Industrial Sensor Reference |
|---|---|
Use Scenario: Regulates output voltage in flyback or forward converter feedback paths using optocoupler-coupled TL431 alternatives. IC Role / Device Role / Timing Role: Zener reference element providing stable 9.1 V threshold for error amplifier biasing. Use Value: Tight ±2% tolerance ensures <±1% output voltage drift across production units without trimming. | Use Scenario: Supplies precise bias voltage to bridge-based pressure or temperature sensors in PLC analog input modules. IC Role / Device Role / Timing Role: Stable shunt reference establishing known excitation level for ratiometric measurements. Use Value: Low 7 μA leakage at 7.2 V prevents loading errors in high-impedance sensor bridges. |
| Overvoltage Clamp Protection | Microcontroller Reset Circuit |
Use Scenario: Clamps transient surges on 12 V rail in automotive body control modules during load dump events. IC Role / Device Role / Timing Role: Shunt protector diverting excess energy above 9.1 V to ground via series resistor. Use Value: 500 mA surge rating handles 12 V system transients without parametric shift or failure. | Use Scenario: Generates clean reset threshold for 8-bit microcontrollers operating from 9 V battery supplies. IC Role / Device Role / Timing Role: Zener-triggered reset generator holding MCU in reset until VCC exceeds 9.1 V × 0.9. Use Value: Sharp 100 Ω knee impedance at 0.25 mA ensures fast, repeatable reset release timing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4739A | Same 9.1 V nominal, but ±5% tolerance (A suffix) vs. ±2% for 1N4739CPE3/TR12 | Acceptable where calibration or trimming compensates for wider tolerance | Select when cost sensitivity outweighs need for initial accuracy |
| BZX55C9V1 | 9.1 V ±5%, DO-35 package, 500 mW rating, higher ZZT (10 Ω) | Lower power and less precise; suitable only for non-critical biasing | Choose only if board space constraints require smaller DO-35 footprint |
Compared with 1N4739A and BZX55C9V1, the 1N4739CPE3/TR12 provides superior initial accuracy (±2% vs. ±5%), higher power handling (1 W vs. 500 mW), and lower dynamic impedance (5 Ω vs. 10 Ω), making it optimal for untrimmed, high-stability reference designs requiring production consistency.
Availability
1N4739CPE3/TR12 is available at Aetrix Electronics and suitable for switching power supplies, industrial sensor interfaces, overvoltage clamping circuits, and microcontroller reset generation requiring stable component supply and long-term obsolescence management.
Supply support for 1N4739CPE3/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 discrete components for aerospace, defense, and industrial markets.
The 1N47xxAP series was developed to deliver JEDEC-standardized, plastic-encapsulated Zener diodes with enhanced thermal performance and RoHS compliance for ruggedized power regulation and voltage reference applications.
FAQ
What is the Zener voltage tolerance of the 1N4739CPE3/TR12?
The 1N4739CPE3/TR12 has a Zener voltage tolerance of ±2%, denoted by the "C" suffix in the part number. This means its nominal 9.1 V breakdown voltage is guaranteed between 8.92 V and 9.28 V at 28 mA test current and 25 °C lead temperature, enabling high-accuracy voltage referencing without post-production adjustment.
Does the 1N4739CPE3/TR12 meet RoHS requirements?
Yes, the 1N4739CPE3/TR12 meets RoHS requirements, confirmed by the "e3" suffix indicating RoHS-compliant annealed matte-tin plating on its axial leads. The device is fully compliant with Directive 2011/65/EU and contains no lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE above threshold limits.
What is the maximum surge current rating for the 1N4739CPE3/TR12?
The 1N4739CPE3/TR12 has a maximum surge current (ISM) rating of 500 mA, measured using a ½-sine wave pulse of 1/120 second duration at 25 °C ambient. This rating allows the device to safely absorb transient overvoltage events common in automotive and industrial power rails without parameter shift or failure.
How does the DO-41 package of the 1N4739CPE3/TR12 affect thermal performance?
The DO-41 package of the 1N4739CPE3/TR12 provides a junction-to-lead thermal resistance of 45 °C/W at 10 mm lead length, enabling reliable 1.0 W power dissipation up to 105 °C lead temperature. When mounted on FR4 with specified copper pads, its junction-to-ambient resistance rises to 105 °C/W, requiring appropriate board-level thermal design for continuous operation.
What does the "TR12" suffix indicate in the 1N4739CPE3/TR12 part number?
"TR12" indicates tape-and-reel packaging per EIA-296 standard, with 12,000 units per reel. This format supports automated axial-lead placement equipment and ensures consistent feeding, reduced handling damage, and traceable lot control - critical for high-volume manufacturing of power supplies and industrial controls using the 1N4739CPE3/TR12.
1N4739CPE3/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):
- 9.1 V
- Tolerance:
- ±2%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 5 Ohms
- Current - Reverse Leakage @ Vr:
- 10 µA @ 7 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)
1N4739CPE3/TR12 FAQ
1.How can I place an order for 1N4739CPE3/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4739CPE3/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 1N4739CPE3/TR12 reliable?
The price and inventory of 1N4739CPE3/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4739CPE3/TR12 is usually 5 days.
3.What payment methods are accepted for 1N4739CPE3/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4739CPE3/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4739CPE3/TR12?
1N4739CPE3/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4739CPE3/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 1N4739CPE3/TR12?
For technical support, including 1N4739CPE3/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4739CPE3/TR12 requirements.
6.How does Aetrix verify that 1N4739CPE3/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N4739CPE3/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 1N4739CPE3/TR12 meets industry standards.
7.What is the process for return or replacement of 1N4739CPE3/TR12?
All 1N4739CPE3/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4739CPE3/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 1N4739CPE3/TR12 part is unused and in its original packaging.
Return procedure for 1N4739CPE3/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4739CPE3/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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Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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BZT52C15S-7-F
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MM5Z5V1ST1G
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SMAJ4744A-TP
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