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Microchip Technology 1N4739P/TR8
- Part No.:
- 1N4739P/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4739P/TR8.pdf
- Description:
- DIODE ZENER 9.1V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:9,082
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Product details
Overview
1N4739P/TR8 from Microsemi is a 1.0 W, 9.1 V ±5% axial-lead silicon Zener diode in DO-41 plastic package, designed for precision voltage regulation in power supply feedback loops, reference circuits, and overvoltage protection. It delivers stable Zener voltage at 28 mA test current, with 5.0 Ω dynamic impedance, 7 μA reverse leakage at 7 V, and operates across –65°C to +150°C.
For engineers reviewing the 1N4739P/TR8 datasheet, 1N4739P/TR8 pinout, 1N4739P/TR8 application, or 1N4739P/TR8 equivalent, key selection criteria include its 9.1 V nominal Zener voltage, 1.0 W power rating at 25°C, DO-41 mechanical compatibility, thermal resistance of 45°C/W (junction-to-lead), and RoHS-compliant "e3" variant availability.
Technical Context
This discrete Zener diode operates in reverse breakdown to maintain a stable 9.1 V reference across a wide current range (1–500 mA), with sharp knee characteristics verified by dual-point Zener impedance measurement per JEDEC standards. Its 5.0 Ω dynamic impedance at 28 mA ensures low output variation under load transients.
The device uses void-free thermosetting epoxy encapsulation (UL94V-0), tin-lead or matte-tin plating, and features cathode band polarity marking. It is moisture-sensitive Level 1 (IPC/JEDEC J-STD-020B) and ESD-nonsensitive per MIL-STD-750 Method 1020.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 9.1 V ±5% at IZT = 28 mA - defines regulated output voltage tolerance in feedback or clamp applications |
| Power Dissipation | 1.0 W at TL ≤ 105°C (3/8″ lead length) - sets maximum continuous thermal load without derating |
| Dynamic Impedance | 5.0 Ω at IZT = 28 mA - determines output voltage stability under varying load current |
| Reverse Leakage Current | 7 μA max at VR = 7 V - ensures minimal quiescent power loss in high-impedance bias networks |
| Thermal Resistance | 45°C/W junction-to-lead - enables accurate thermal design when leads serve as primary heat path |
| Operating Temperature | –65°C to +150°C - supports deployment in automotive under-hood, industrial control, and aerospace environments |
| Forward Voltage | 1.2 V max at IF = 200 mA - relevant for polarity-check or forward-bias protection use cases |
Pinout & Package
DO-41 (DO-204AL) plastic axial-lead package with cathode indicated by color band; leads are tin-lead or RoHS-compliant matte-tin plated, solderable per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Non-banded lead | Connected to lower-potential node; forward conduction path during polarity verification or transient clamping |
| Cathode | Banded lead | Connected to higher-potential node; Zener regulation occurs with cathode positive relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered 1N47xxAP series | Ensures cross-manufacturer interchangeability and standardized test conditions per industry baseline |
| Plastic P-suffix construction | Delivers lower thermal resistance vs. glass-body (G-suffix) variants, improving power handling in compact layouts |
| Level 1 moisture sensitivity | Eliminates dry-pack requirement and bake-out prior to assembly, reducing manufacturing overhead |
| RoHS-compliant "e3" option | Enables compliance with environmental directives without redesign or qualification retesting |
| Nonsensitive to ESD | Withstands handling per MIL-STD-750 Method 1020, reducing process-induced failures in automated assembly |
Applications
| Switching Power Supply Feedback | Overvoltage Clamp Circuit |
|---|---|
Use Scenario: Regulates output voltage in isolated flyback or forward converter feedback paths using optocoupler-coupled error amplification. IC Role / Device Role / Timing Role: Provides precise 9.1 V reference for TL431-like shunt regulator or direct feedback to PWM controller. Use Value: Maintains ±5% output accuracy across line/load/temperature with 5.0 Ω dynamic impedance limiting regulation error under transient loads. | Use Scenario: Protects downstream ICs from transient overvoltage events on 12 V rail in automotive body control modules. IC Role / Device Role / Timing Role: Acts as passive crowbar element clamping voltage to 9.1 V before damage threshold of protected devices. Use Value: Absorbs up to 500 mA surge current (IZM) while holding clamped voltage within specification, preventing latch-up or gate oxide rupture. |
| Reference Voltage Source | Linear Regulator Bias Network |
Use Scenario: Generates stable bias for analog comparators or ADC reference buffers in industrial sensor signal chains. IC Role / Device Role / Timing Role: Supplies low-noise, temperature-stable 9.1 V reference independent of input rail fluctuations. Use Value: Delivers <7 μA leakage at 7 V and –65°C to +150°C operation, minimizing drift-induced offset in precision measurement systems. | Use Scenario: Sets base drive current for pass transistor in discrete linear regulators powering FPGA core rails. IC Role / Device Role / Timing Role: Establishes fixed Zener drop to bias series pass element, enabling adjustable output via resistor divider. Use Value: Supports 1.0 W continuous dissipation at lead temperature ≤105°C, allowing robust thermal design with standard PCB copper pads. |
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 "P" suffix indicates glass-body construction; higher thermal resistance (≈60°C/W vs. 45°C/W) | Less suitable for high-power-density layouts where lead conduction dominates cooling | Select 1N4739P/TR8 when thermal performance or moisture resilience (Level 1) is critical |
| MMSZ4702T1G | Surface-mount SOD-123 package; 9.1 V ±5%, 500 mW rating; 10 Ω ZZT | Requires PCB redesign; lower power and higher impedance limit use in high-current regulation | Choose MMSZ4702T1G only for space-constrained, low-power SMT designs where DO-41 is impractical |
Compared with 1N4739A and MMSZ4702T1G, the 1N4739P/TR8 offers superior thermal management in axial-lead form, guaranteed Level 1 moisture classification, and full 1.0 W capability-making it optimal for through-hole power supply and industrial clamp applications requiring reliability and legacy footprint compatibility.
Availability
1N4739P/TR8 is available at Aetrix Electronics and suitable for switching power supplies, overvoltage protection circuits, and precision reference designs requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for 1N4739P/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 engineered to deliver JEDEC-standardized, high-stability Zener regulation in ruggedized plastic packages for mission-critical power conditioning and voltage reference applications.
FAQ
What is the Zener voltage tolerance of the 1N4739P/TR8?
The 1N4739P/TR8 has a nominal Zener voltage of 9.1 V with a tolerance of ±5%, as indicated by the "A" suffix in its JEDEC designation. This tolerance is specified 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 1N4739P/TR8 require dry packing before PCB assembly?
No, the 1N4739P/TR8 does not require dry packing. It is classified as moisture sensitivity Level 1 per IPC/JEDEC J-STD-020B, meaning it can be stored and assembled without baking or humidity-controlled handling-unlike higher-level moisture-sensitive devices. This simplifies manufacturing logistics and reduces cost for high-volume production of the 1N4739P/TR8.
What is the maximum steady-state current the 1N4739P/TR8 can regulate continuously?
The 1N4739P/TR8 supports a maximum regulator current (IZM) of 500 mA at TA = 50°C, as specified in Microsemi's electrical characteristics table. At 25°C ambient and proper lead heatsinking (3/8″ from body), it sustains 1.0 W dissipation, corresponding to ~109 mA at 9.1 V-though actual continuous current depends on thermal design and ambient conditions.
How does the "P" suffix in 1N4739P/TR8 differ from the "A" in 1N4739A?
The "P" suffix in 1N4739P/TR8 denotes plastic encapsulation (DO-41), whereas 1N4739A refers to the legacy glass-body (DO-35) version. The plastic variant offers lower thermal resistance (45°C/W vs. ~60°C/W), Level 1 moisture rating, and RoHS-compliant "e3" options-making the 1N4739P/TR8 more robust for modern industrial and automotive applications than the 1N4739A.
Is the 1N4739P/TR8 compatible with lead-free reflow soldering processes?
Yes, the 1N4739P/TR8 is qualified for lead-free soldering at 260°C for 10 seconds maximum, per MIL-STD-750 Method 2026. Its matte-tin plating (standard for RoHS-compliant "e3" versions) ensures reliable wetting and intermetallic formation. Standard SnPb soldering is also supported, providing flexibility for mixed-technology assembly of the 1N4739P/TR8.
1N4739P/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:
- ±10%
- 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)
1N4739P/TR8 FAQ
1.How can I place an order for 1N4739P/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4739P/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 1N4739P/TR8 reliable?
The price and inventory of 1N4739P/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4739P/TR8 is usually 5 days.
3.What payment methods are accepted for 1N4739P/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4739P/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4739P/TR8?
1N4739P/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4739P/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 1N4739P/TR8?
For technical support, including 1N4739P/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4739P/TR8 requirements.
6.How does Aetrix verify that 1N4739P/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N4739P/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 1N4739P/TR8 meets industry standards.
7.What is the process for return or replacement of 1N4739P/TR8?
All 1N4739P/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4739P/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 1N4739P/TR8 part is unused and in its original packaging.
Return procedure for 1N4739P/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4739P/TR8 Tags
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MMBZ5240B-7-F
Diodes Incorporated
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Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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Diodes Incorporated
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onsemi
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Diodes Incorporated
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MM5Z5V1ST1G
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SMAJ4744A-TP
Micro Commercial Co
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