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Microchip Technology 1N4739APE3/TR8
- Part No.:
- 1N4739APE3/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4739APE3/TR8.pdf
- Description:
- DIODE ZENER 9.1V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:3,926
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Product details
Overview
1N4739APE3/TR8 from Microsemi is a 9.1 V, 1 W plastic-encapsulated Zener diode with ±5% voltage tolerance, 28 mA test current (IZT), 5.0 Ω dynamic impedance (ZZT), and DO-41 package. It regulates voltage in power supply reference, overvoltage protection, and voltage-clamping circuits across -65°C to +150°C.
For engineers reviewing the 1N4739APE3/TR8 datasheet, 1N4739APE3/TR8 pinout, 1N4739APE3/TR8 application, or 1N4739APE3/TR8 equivalent, key selection factors include Zener voltage accuracy, thermal resistance (45°C/W junction-to-lead), surge current rating (500 mA), RoHS compliance (e3 suffix), and tape-and-reel packaging (TR8).
Technical Context
This discrete Zener diode operates in reverse breakdown to maintain stable output voltage under varying load and temperature conditions. Its 9.1 V nominal Zener voltage is specified at 28 mA test current with 5.0 Ω dynamic impedance, ensuring low regulation error across its operating range.
The device uses silicon PN-junction technology in a void-free thermosetting epoxy DO-41 package with tin-plated axial leads. Polarity is marked by a cathode band; regulation occurs when the banded end is held positive relative to the anode, supporting unidirectional voltage reference and clamping functions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (Vz) | 9.1 V ±5% at 28 mA - defines precise regulation point for reference and clamp circuits |
| Power Dissipation | 1.0 W at 25°C - sets maximum continuous DC power handling before thermal derating |
| Dynamic Impedance (ZZT) | 5.0 Ω at IZT - determines output voltage variation under load current changes |
| Test Current (IZT) | 28 mA - standard bias condition for Vz and ZZT measurement and design validation |
| Max Reverse Current (IR) | 7 µA at 7.2 V - ensures low leakage below knee voltage for stable standby operation |
| Surge Current (ISM) | 500 mA - supports transient overvoltage absorption without failure |
| Thermal Resistance | 45°C/W junction-to-lead - enables thermal management with 3/8" lead length mounting |
Pinout & Package
DO-41 (DO-204AL) plastic axial-leaded package with cathode indicated by a painted band. Leads are tin-plated, solderable per MIL-STD-750 Method 2026, and rated for 260°C for 10 s.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reverse-biased input terminal | Connected to lower-potential node during Zener operation; carries full regulator current |
| Cathode | Regulated output terminal | Banded end; held at stable 9.1 V above anode potential when reverse-biased above Vz |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC 1N47xxAP-compliant construction | Ensures mechanical and electrical interchangeability with industry-standard 1 W Zener footprints |
| RoHS-compliant "e3" termination | Meets EU Directive 2011/65/EU with annealed matte-tin plating, no lead content |
| Moisture Sensitivity Level 1 | Eliminates dry-pack requirement and floor-life constraints for SMT assembly prep |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Enables handling without special static control in standard production environments |
| Tape-and-reel packaging (TR8) | Supports automated pick-and-place placement with EIA-296 standard carrier tape |
Applications
| Power Supply Reference | Overvoltage Protection |
|---|---|
Use Scenario: Providing stable 9.1 V reference for linear regulator feedback or ADC reference divider networks. IC Role / Device Role / Timing Role: Voltage reference element establishing precision bias point for analog circuitry. Use Value: ±5% Vz tolerance and 5.0 Ω ZZT ensure <±0.5 V drift over 10–100 mA load range at 25°C. | Use Scenario: Clamping transient spikes on 12 V automotive or industrial bus lines to prevent downstream IC damage. IC Role / Device Role / Timing Role: Shunt protector diverting excess energy to ground when bus voltage exceeds 9.1 V. Use Value: 500 mA surge current rating absorbs 100 ms transients per ISO 7637-2 without degradation. |
| Voltage Clamp for Signal Lines | Temperature-Stable Bias Generator |
Use Scenario: Limiting RS-232 or sensor interface signal swing to protect 10 V tolerant receivers. IC Role / Device Role / Timing Role: Bidirectional clamp (with series resistor) limiting positive excursions to 9.1 V + VF. Use Value: Low 5.0 Ω dynamic impedance maintains tight clamping window even under fast-rising edges. | Use Scenario: Generating temperature-compensated bias for op-amp input stages in wide-range industrial sensors. IC Role / Device Role / Timing Role: Stable DC reference source with known tempco (≈+3 mV/°C near 9.1 V). Use Value: Operates continuously from -65°C to +150°C with predictable Vz drift, enabling calibration-free designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4739A | No "e3" RoHS suffix; Sn/Pb terminations; same Vz, IZT, ZZT, and DO-41 package | Not suitable for lead-free assembly; otherwise functionally identical in legacy designs | Select 1N4739A only if Pb-based solder process is used and RoHS exemption applies |
| MMBZ5239BS-7-F | SOT-23 surface-mount package; 9.1 V ±5%; 20 mA IZT; 10 Ω ZZT; 250 mW Pd | Limited power handling and higher impedance reduce regulation stability under >50 mA loads | Choose MMBZ5239BS-7-F only for space-constrained PCBs where 250 mW dissipation suffices |
Compared with 1N4739A and MMBZ5239BS-7-F, the 1N4739APE3/TR8 delivers full 1 W power capability, lower 5.0 Ω impedance, and RoHS-compliant tape-and-reel packaging-making it optimal for through-hole industrial power rails requiring robust, compliant, and thermally stable regulation.
Availability
1N4739APE3/TR8 is available at Aetrix Electronics and suitable for power supply reference, overvoltage protection, and voltage-clamping applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.
Supply support for 1N4739APE3/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, mixed-signal, and RF solutions for aerospace, defense, and industrial markets.
The 1N47xxAP series was designed for general-purpose, high-stability voltage regulation in ruggedized power systems where thermal resilience, moisture immunity, and JEDEC-standard compatibility are critical.
FAQ
What is the Zener voltage tolerance of the 1N4739APE3/TR8?
The 1N4739APE3/TR8 has a nominal Zener voltage of 9.1 V with a tolerance of ±5%, as indicated by the "A" suffix in the part number. This tolerance is verified at 28 mA test current and 25°C lead temperature, and applies across the full operating temperature range of -65°C to +150°C per Microsemi's published electrical characteristics table.
Does the 1N4739APE3/TR8 require dry packing before PCB assembly?
No, the 1N4739APE3/TR8 does not require dry packing. It is rated Moisture Sensitivity Level 1 per IPC/JEDEC J-STD-020B, meaning it has no floor-life limitation and can be stored and assembled without baking or humidity-controlled handling-ideal for standard industrial production lines.
What is the maximum surge current rating for the 1N4739APE3/TR8?
The 1N4739APE3/TR8 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 enables reliable transient suppression in automotive load-dump or inductive-switching scenarios without permanent parameter shift.
How is polarity marked on the 1N4739APE3/TR8?
The 1N4739APE3/TR8 uses a cathode band-a single painted stripe near one end of the DO-41 body-to indicate polarity. For proper Zener regulation, the banded end must be held positive relative to the opposite (anode) end. This marking is visible and durable per Microsemi's mechanical packaging specification.
Is the 1N4739APE3/TR8 compatible with lead-free reflow processes?
Yes, the 1N4739APE3/TR8 is fully compatible with lead-free reflow. Its "e3" suffix denotes RoHS-compliant annealed matte-tin plating, and its package is rated for 260°C for 10 seconds-meeting JEDEC J-STD-020 requirements for Pb-free soldering without delamination or termination degradation.
1N4739APE3/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:
- ±5%
- 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)
1N4739APE3/TR8 FAQ
1.How can I place an order for 1N4739APE3/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4739APE3/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 1N4739APE3/TR8 reliable?
The price and inventory of 1N4739APE3/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4739APE3/TR8 is usually 5 days.
3.What payment methods are accepted for 1N4739APE3/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4739APE3/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4739APE3/TR8?
1N4739APE3/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4739APE3/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 1N4739APE3/TR8?
For technical support, including 1N4739APE3/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4739APE3/TR8 requirements.
6.How does Aetrix verify that 1N4739APE3/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N4739APE3/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 1N4739APE3/TR8 meets industry standards.
7.What is the process for return or replacement of 1N4739APE3/TR8?
All 1N4739APE3/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4739APE3/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 1N4739APE3/TR8 part is unused and in its original packaging.
Return procedure for 1N4739APE3/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4739APE3/TR8 Tags
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MMSZ5231B-7-F
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BZX84C3V3LT1G
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MMSZ4682T1G
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MM5Z5V1ST1G
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