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Microchip Technology 1N4739AP/TR12
- Part No.:
- 1N4739AP/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4739AP/TR12.pdf
- Description:
- DIODE ZENER 9.1V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:7,121
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Product details
Overview
1N4739AP/TR12 from Microsemi is a 9.1 V, 1 W plastic-encapsulated Zener diode with ±5% voltage tolerance, 28 mA test current (IZT), and 5.0 Ω dynamic impedance (ZZT) at IZT. It operates from –65°C to +150°C and regulates voltage in low-power reference and protection circuits such as power supply feedback loops and overvoltage clamping.
For engineers reviewing the 1N4739AP/TR12 datasheet, 1N4739AP/TR12 pinout, 1N4739AP/TR12 application, or 1N4739AP/TR12 equivalent, key selection criteria include Zener voltage accuracy, thermal resistance (45°C/W junction-to-lead), surge current rating (500 mA), and RoHS-compliant "e3" plating compatibility with automated assembly.
Technical Context
This axial-lead Zener diode functions in reverse-biased breakdown mode to maintain stable voltage across its terminals under varying load and temperature conditions. Its DO-41 package enables through-hole mounting with flexible lead termination and meets IPC/JEDEC J-STD-020B Level 1 moisture sensitivity without dry pack.
The device delivers regulation with 100 µA maximum reverse leakage at 7 V (VR), 1.2 V forward voltage at 200 mA, and 0.5 A maximum regulator current (IZM) at TA = 50°C. Thermal derating begins above 45°C ambient on FR4 board or 105°C lead temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 9.1 V ±5% - precise DC reference for feedback networks and voltage clamp thresholds |
| Power Dissipation | 1.0 W at TL < 105°C or TA < 45°C - defines maximum continuous thermal load on PCB or leads |
| Test Current (IZT) | 28 mA - operating point where VZ and ZZT are specified; used for stable biasing |
| Dynamic Impedance (ZZT) | 5.0 Ω at IZT - low AC impedance ensures minimal voltage variation under ripple or transient load |
| Max Reverse Leakage (IR) | 10 µA at VR = 7 V - confirms tight regulation onset and low standby power loss |
| Surge Current (ISM) | 500 mA - withstands short-duration transients without degradation |
| Thermal Resistance | 45 °C/W junction-to-lead - determines temperature rise per watt in lead-mounted configurations |
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 per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reverse-bias reference node | Connected to lower-potential side of regulated circuit; carries full Zener current during regulation |
| Cathode | Regulated output node | Banded end; held at stable 9.1 V relative to anode when reverse-biased above knee voltage |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener | Fully compliant with JEDEC 1N4739A standard for interchangeability and test methodology |
| Plastic encapsulation (P suffix) | Lower thermal resistance vs. glass-body variants-improves power handling in compact layouts |
| Moisture Sensitivity Level 1 | No dry pack required-reduces handling cost and simplifies SMT/through-hole assembly logistics |
| ESD robustness | Nonsensitive per MIL-STD-750 Method 1020-enables safe handling without special ESD controls |
| RoHS-compliant option | "e3" suffix denotes annealed matte-tin plating-meets environmental compliance without solderability trade-offs |
Applications
| Power Supply Feedback | Voltage Clamp Protection |
|---|---|
Use Scenario: Stabilizing output voltage in linear regulators or switching converter feedback paths. IC Role / Device Role / Timing Role: Provides precise 9.1 V reference to error amplifier input. Use Value: Enables ±5% output regulation accuracy with minimal temperature drift over –65°C to +150°C. | Use Scenario: Limiting transient overvoltage on microcontroller I/O lines or sensor inputs. IC Role / Device Role / Timing Role: Shunts excess energy to ground when voltage exceeds 9.1 V. Use Value: Absorbs 500 mA surge current without failure, protecting downstream logic from ESD or inductive kick. |
| Reference Voltage Source | Current Source Biasing |
Use Scenario: Generating stable bias for op-amp comparators or analog front-ends. IC Role / Device Role / Timing Role: Delivers low-impedance 9.1 V node independent of supply variation. Use Value: 5.0 Ω dynamic impedance ensures <10 mV ripple rejection at 28 mA operating point. | Use Scenario: Setting constant current for LED drivers or transistor bias networks. IC Role / Device Role / Timing Role: Acts as voltage-controlled current limiter via series resistor. Use Value: 1.0 W power rating supports up to 110 mA constant current with thermal margin on FR4 board. |
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; glass-body construction; higher thermal resistance (≈60°C/W junction-to-ambient) | Less suitable for high-density PCBs requiring low thermal rise; same electrical specs | Select 1N4739AP/TR12 for improved thermal performance and RoHS compliance in new designs |
| MMBZ5239BS | SOT-23 surface-mount; 9.1 V ±5%; 200 mW rating; 10 Ω ZZT; 20 mA IZT | Lower power and smaller footprint; not drop-in compatible due to package and thermal limits | Choose MMBZ5239BS only for space-constrained, low-power applications where 1N4739AP/TR12's 1 W rating is unnecessary |
Compared with 1N4739A and MMBZ5239BS, the 1N4739AP/TR12 offers superior thermal management in through-hole layouts, guaranteed 1 W dissipation, and moisture-insensitive packaging-making it optimal for industrial power supplies and ruggedized analog systems where reliability under thermal stress is critical.
Availability
1N4739AP/TR12 is available at Aetrix Electronics and suitable for power supply feedback, voltage clamp protection, reference voltage source, and current source biasing applications requiring stable component supply and long-term obsolescence support.
Supply support for 1N4739AP/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 designed specifically for precision voltage regulation in harsh-environment power systems, emphasizing thermal stability, moisture resilience, and JEDEC-standard interoperability.
FAQ
What is the Zener voltage tolerance for 1N4739AP/TR12?
The 1N4739AP/TR12 has a nominal Zener voltage of 9.1 V with a ±5% tolerance, as indicated by the "A" suffix in the part number per JEDEC registration. This tolerance applies at 25°C lead temperature with 28 mA test current and ensures predictable regulation across production lots without requiring binning or calibration.
Does 1N4739AP/TR12 require dry packing before reflow?
No, the 1N4739AP/TR12 is moisture sensitivity level 1 per IPC/JEDEC J-STD-020B, meaning it does not require dry packing or baking prior to assembly. Its void-free epoxy body and Level 1 classification eliminate moisture-related popcorning risks during standard soldering processes including wave and reflow.
What is the maximum surge current rating for 1N4739AP/TR12?
The 1N4739AP/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 overvoltages in protection circuits without permanent degradation.
How does the "P" suffix affect the 1N4739AP/TR12 package and performance?
The "P" suffix in 1N4739AP/TR12 designates plastic encapsulation (DO-41), which provides lower thermal resistance (45°C/W junction-to-lead) compared to the glass-body "G" variant. This improves power handling and thermal stability in high-temperature environments while maintaining identical electrical specifications.
Is 1N4739AP/TR12 RoHS compliant?
Yes, the 1N4739AP/TR12 is RoHS compliant, as confirmed by the "e3" designation in Microsemi's official documentation. It features annealed matte-tin plating on leads, meeting EU RoHS Directive 2011/65/EU requirements without compromising solderability or reliability.
1N4739AP/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:
- ±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)
1N4739AP/TR12 FAQ
1.How can I place an order for 1N4739AP/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4739AP/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 1N4739AP/TR12 reliable?
The price and inventory of 1N4739AP/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4739AP/TR12 is usually 5 days.
3.What payment methods are accepted for 1N4739AP/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4739AP/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4739AP/TR12?
1N4739AP/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4739AP/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 1N4739AP/TR12?
For technical support, including 1N4739AP/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4739AP/TR12 requirements.
6.How does Aetrix verify that 1N4739AP/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N4739AP/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 1N4739AP/TR12 meets industry standards.
7.What is the process for return or replacement of 1N4739AP/TR12?
All 1N4739AP/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4739AP/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 1N4739AP/TR12 part is unused and in its original packaging.
Return procedure for 1N4739AP/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4739AP/TR12 Tags
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