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Microchip Technology 1N4739CPE3/TR8
- Part No.:
- 1N4739CPE3/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4739CPE3/TR8.pdf
- Description:
- DIODE ZENER 9.1V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:8,693
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Product details
Overview
1N4739CPE3/TR8 from Microsemi is a 9.1 V, ±2% tolerance, 1 W axial-lead silicon Zener diode in DO-41 (DO-204AL) plastic 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 reference and overvoltage protection circuits.
For engineers reviewing the 1N4739CPE3/TR8 datasheet, 1N4739CPE3/TR8 pinout, 1N4739CPE3/TR8 application, or 1N4739CPE3/TR8 equivalent, key selection factors include its tight 2% Zener voltage tolerance, low 5 Ω ZZT, RoHS-compliant matte-tin plating, tape-and-reel packaging (TR8), and operation across –65°C to +150°C.
Technical Context
This discrete Zener diode operates in reverse breakdown to maintain stable output voltage under varying load and temperature conditions. It delivers regulated 9.1 V with ±2% initial accuracy (C suffix), 5 Ω dynamic impedance at 28 mA, and 7 μA maximum reverse leakage at 7.2 V.
Thermal performance is defined by 45°C/W junction-to-lead resistance at 10 mm lead length and 105°C/W junction-to-ambient on FR4 with specified copper pad geometry. Its DO-41 plastic package meets UL94V-0 flammability rating and IPC/JEDEC J-STD-020B Level 1 moisture sensitivity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 9.1 V ±2% - precise reference voltage for feedback loops and clamping |
| Power Dissipation | 1.0 W at TL < 105°C - supports continuous regulation in compact layouts |
| Test Current (IZT) | 28 mA - standard bias point for specifying VZ and ZZT |
| Dynamic Impedance (ZZT) | 5 Ω @ 28 mA - low AC resistance ensures minimal output voltage variation under load transients |
| Reverse Leakage (IR) | 7 μA @ 7.2 V - negligible standby current in high-impedance sensing nodes |
| Operating Temperature | –65°C to +150°C - suitable for industrial and automotive under-hood environments |
| Package | DO-41 (DO-204AL) - industry-standard axial-leaded plastic package with cathode band marking |
Pinout & Package
DO-41 (DO-204AL) plastic package with axial leads: cathode indicated by painted band; anode is unmarked lead. 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 | Forward conduction terminal / Zener cathode reference node | Connected to lower-potential side of regulation circuit; reverse-biased during Zener operation |
| Cathode | Zener breakdown terminal / regulated output node | Banded end; connected to higher-potential side; maintains stable 9.1 V relative to anode when reverse-biased |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance (C suffix) | Enables tighter regulation without external trimming in mid-precision references |
| RoHS-compliant matte-tin plating (e3 suffix) | Ensures solderability and reliability under Pb-free reflow profiles up to 260°C/10 s |
| Tape-and-reel packaging (TR8 suffix) | Supports automated SMT placement despite axial-lead form factor via carrier tape indexing |
| Moisture sensitivity Level 1 | Eliminates dry-pack requirement and bake-out prior to assembly |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Reduces handling precautions and eliminates need for ESD-safe workstations in production |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Clamp for Microcontroller I/O |
|---|---|
Use Scenario: Stabilizing optocoupler input voltage in isolated flyback converter feedback loop. IC Role / Device Role / Timing Role: Precision voltage reference for TL431-like feedback path. Use Value: 9.1 V output with ±2% tolerance ensures consistent regulation setpoint across temperature and line variations. | Use Scenario: Protecting 3.3 V or 5 V GPIO pins from transient overvoltage events. IC Role / Device Role / Timing Role: Shunt clamp limiting input voltage to safe levels during ESD or surge. Use Value: Low 5 Ω ZZT enables rapid clamping response with minimal overshoot before triggering protection circuitry. |
| Industrial Sensor Signal Conditioning | Reference Voltage for Analog-to-Digital Conversion |
Use Scenario: Providing stable excitation voltage to resistive bridge sensors in harsh ambient conditions. IC Role / Device Role / Timing Role: Low-drift DC reference source for Wheatstone bridge biasing. Use Value: –65°C to +150°C operating range and <±0.05%/°C tempco (typical for 9.1 V Zeners) ensure stability in uncontrolled enclosures. | Use Scenario: Generating accurate reference for 10-bit or 12-bit ADCs in data acquisition modules. IC Role / Device Role / Timing Role: Fixed-voltage reference replacing more expensive bandgap ICs where moderate accuracy suffices. Use Value: 2% initial tolerance and low 7 μA leakage minimize reference error contribution and loading effects on ADC input. |
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) instead of ±2% | Acceptable where cost sensitivity outweighs precision requirements | Select 1N4739A only if system-level calibration or wider tolerance bands accommodate ±5% variation |
| BZX55C9V1 | 9.1 V ±5%, DO-35 glass package, 500 mW power rating | Lower power dissipation limits use in sustained-current applications | Choose BZX55C9V1 only for low-duty-cycle clamping or space-constrained designs where DO-35 fits better than DO-41 |
Compared with 1N4739A and BZX55C9V1, the 1N4739CPE3/TR8 offers superior voltage precision (±2% vs. ±5%), higher power handling (1 W vs. 500 mW), and RoHS-compliant tape-and-reel packaging-making it optimal for production-grade industrial power management where accuracy, thermal margin, and assembly compatibility are critical.
Availability
1N4739CPE3/TR8 is available at Aetrix Electronics and suitable for switch-mode power supplies, industrial sensor interfaces, and microcontroller I/O protection requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for 1N4739CPE3/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, RF, and discrete components for aerospace, defense, and industrial markets.
The 1N47xxAP series was designed specifically for robust, cost-effective voltage regulation in high-volume commercial and industrial power systems, emphasizing thermal stability, moisture resilience, and JEDEC-standard compatibility.
FAQ
What is the Zener voltage tolerance of the 1N4739CPE3/TR8?
The 1N4739CPE3/TR8 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 falls within 8.92 V to 9.28 V at 25°C and 28 mA test current, enabling tighter regulation than the ±5% 1N4739A variant.
What does the "e3" suffix indicate on the 1N4739CPE3/TR8?
The "e3" suffix on the 1N4739CPE3/TR8 indicates RoHS-compliant matte-tin plating on the leads, verified per JEDEC standards. This ensures compatibility with lead-free soldering processes, including peak reflow temperatures up to 260°C for 10 seconds, without compromising solder joint integrity or corrosion resistance.
What is the maximum reverse leakage current for the 1N4739CPE3/TR8?
The 1N4739CPE3/TR8 specifies a maximum reverse leakage current (IR) of 7 μA at a reverse test voltage (VR) of 7.2 V and ambient temperature. This low leakage supports high-impedance reference applications and minimizes parasitic loading in precision analog circuits.
How is thermal performance defined for the 1N4739CPE3/TR8?
Thermal performance of the 1N4739CPE3/TR8 is defined as 45°C/W junction-to-lead resistance at 10 mm lead length from the body, and 105°C/W junction-to-ambient on FR4 board with specified copper geometry. Derating begins above 105°C lead temperature or 45°C ambient, maintaining 1.0 W dissipation only within those limits.
What does the "TR8" suffix signify in the 1N4739CPE3/TR8 part number?
The "TR8" suffix in 1N4739CPE3/TR8 indicates tape-and-reel packaging per EIA-296 standard, with 8 mm carrier tape width and component orientation optimized for automated pick-and-place equipment. This format supports high-volume manufacturing while preserving the DO-41 axial-lead mechanical configuration.
1N4739CPE3/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):
- 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/TR8 FAQ
1.How can I place an order for 1N4739CPE3/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4739CPE3/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 1N4739CPE3/TR8 reliable?
The price and inventory of 1N4739CPE3/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4739CPE3/TR8 is usually 5 days.
3.What payment methods are accepted for 1N4739CPE3/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4739CPE3/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4739CPE3/TR8?
1N4739CPE3/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4739CPE3/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 1N4739CPE3/TR8?
For technical support, including 1N4739CPE3/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4739CPE3/TR8 requirements.
6.How does Aetrix verify that 1N4739CPE3/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N4739CPE3/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 1N4739CPE3/TR8 meets industry standards.
7.What is the process for return or replacement of 1N4739CPE3/TR8?
All 1N4739CPE3/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4739CPE3/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 1N4739CPE3/TR8 part is unused and in its original packaging.
Return procedure for 1N4739CPE3/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4739CPE3/TR8 Tags
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Diodes Incorporated
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