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Microchip Technology 1N4739P/TR12
- Part No.:
- 1N4739P/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4739P/TR12.pdf
- Description:
- DIODE ZENER 9.1V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:6,252
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Product details
Overview
1N4739P/TR12 from Microsemi is a 1.0 W plastic-encapsulated Zener diode with a nominal Zener voltage of 9.1 V ±5%, 28 mA test current (IZT), 5.0 Ω dynamic impedance (ZZT), and 7 μA maximum reverse leakage at 7 V. It operates from –65°C to +150°C and is used for precision voltage regulation in power supply reference and overvoltage protection circuits.
For engineers reviewing the 1N4739P/TR12 datasheet, 1N4739P/TR12 pinout, 1N4739P/TR12 application, or 1N4739P/TR12 equivalent, key selection factors include its DO-41 package, 9.1 V regulation tolerance, thermal resistance (45°C/W junction-to-lead), surge current rating (500 mA), and RoHS-compliant "e3" variant availability.
Technical Context
This discrete Zener diode functions as a two-terminal voltage reference device operating in reverse breakdown. Its regulation stability relies on controlled avalanche characteristics at 9.1 V, with knee impedance (ZZK) of 100 Ω measured at 0.5 mA IZK and reverse leakage tightly specified at 7 μA @ VR = 7 V.
The device uses a void-free thermosetting epoxy case (UL94V-0 rated), tin-lead or matte-tin plating, and axial-leaded DO-41 (DO-204AL) packaging. Polarity is marked by a cathode band; operation requires the banded end to be positive relative to the anode for Zener conduction.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (Vz) | 9.1 V ±5% at 28 mA - defines stable regulation point under standard test conditions |
| Power Dissipation | 1.0 W at TL < 105°C (3/8″ lead length) - sets maximum continuous thermal load without derating |
| Dynamic Impedance (ZZT) | 5.0 Ω @ 28 mA - indicates low AC impedance for stable output under varying load currents |
| Reverse Leakage (IR) | 7 μA max @ 7 V - ensures minimal standby current in shunt regulation applications |
| Thermal Resistance | 45°C/W junction-to-lead - enables accurate thermal design when mounted with 10 mm lead length |
| Surge Current (ISM) | 500 mA @ 1/120 s pulse - supports transient overvoltage clamping capability |
| Operating Temperature | –65°C to +150°C - suitable for industrial and automotive under-hood environments |
Pinout & Package
Package: DO-41 (JEDEC DO-204AL), axial-leaded plastic encapsulated diode with cathode band marking. Moisture sensitivity level 1; no dry pack required.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference ground node in shunt regulator | Connected to system ground or lower-potential rail; carries full load current during regulation |
| Cathode | Regulated output node | Banded end; held at 9.1 V above anode; supplies reference voltage to feedback networks or protection circuits |
Key Features
| Feature | Design Value |
|---|---|
| Plastic P-suffix construction | Lower thermal resistance vs. glass-body (G-suffix) variants - improves power handling in compact layouts |
| JEDEC 1N47xxA registration | Industry-standard footprint and electrical behavior - ensures compatibility with legacy designs and PCB footprints |
| RoHS-compliant e3 option | Matte-tin plating per MIL-STD-750 - eliminates lead while maintaining solderability and reliability |
| MIL-PRF-19500 screening support | Available with MQ/MX/MV/MSP prefixes - enables use in aerospace and defense systems requiring extended reliability testing |
Applications
| Power Supply Reference | Overvoltage Clamp |
|---|---|
Use Scenario: Stabilizing feedback voltage in linear regulators or switching converter error amplifiers. IC Role / Device Role / Timing Role: Shunt voltage reference providing fixed 9.1 V reference to op-amp or controller input. Use Value: Maintains ±5% regulation across 10–100 mA load range and –40°C to +85°C ambient, reducing output drift. | Use Scenario: Protecting downstream ICs from transient voltage spikes on 12 V rails. IC Role / Device Role / Timing Role: Passive crowbar element conducting when rail exceeds 9.1 V + tolerance. Use Value: Limits peak voltage to ≤9.6 V with 500 mA surge capability, preventing latch-up in microcontrollers. |
| Signal Level Shifting | Current Source Bias |
Use Scenario: Generating a stable offset voltage for analog sensor signal conditioning. IC Role / Device Role / Timing Role: DC bias generator establishing 9.1 V common-mode level for op-amp inputs. Use Value: Provides low-noise, temperature-stable reference (TC ≈ +3 mV/°C per Figure 3) for precision instrumentation. | Use Scenario: Setting constant current for LED driver or transistor bias network. IC Role / Device Role / Timing Role: Voltage reference defining emitter/base voltage drop in constant-current sink. Use Value: Enables <1% current variation over 25–75°C using series resistor, due to tight 5% Vz tolerance and low ZZT. |
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 TR12 tape-and-reel; bulk or ammo pack only; same electrical specs and DO-41 package | Lacks automated placement support; unsuitable for high-volume SMT line integration | Select 1N4739P/TR12 for pick-and-place assembly; choose 1N4739A for prototyping or low-volume hand-soldered builds |
| BZX55-C9V1 | 5% tolerance, 1 W rating, DO-35 package - smaller body, higher thermal resistance (500°C/W ambient) | Higher thermal impedance limits power delivery in sustained regulation; not drop-in due to different footprint | Use BZX55-C9V1 only where board space is constrained and thermal load is intermittent; verify pad layout compatibility |
Compared with 1N4739A and BZX55-C9V1, the 1N4739P/TR12 offers verified tape-and-reel packaging for automated manufacturing, lower junction-to-lead thermal resistance (45°C/W), and JEDEC-standard DO-41 mechanical compatibility - critical for production continuity and thermal reliability in 12 V system rails.
Availability
1N4739P/TR12 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, and telecom line-card voltage references requiring stable component supply and long-term obsolescence management.
Supply support for 1N4739P/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 to deliver JEDEC-standard, 1 W Zener regulation with enhanced thermal performance in plastic packaging - targeting cost-sensitive yet reliability-critical applications where glass-body alternatives were historically preferred.
FAQ
What is the Zener voltage tolerance for 1N4739P/TR12?
The 1N4739P/TR12 has a nominal Zener voltage of 9.1 V with a ±5% tolerance, as indicated by the "A" suffix in its base part number (1N4739A). This tolerance is guaranteed at 28 mA test current and 25°C lead temperature, per Microsemi's REV C datasheet.
Does 1N4739P/TR12 support automated assembly?
Yes, the "TR12" suffix denotes EIA-296 standard tape-and-reel packaging (12 mm carrier tape), enabling direct use in high-speed pick-and-place equipment. The 1N4739P/TR12 is fully compatible with DO-41 feeders and vision-guided placement systems.
What is the maximum steady-state power dissipation for 1N4739P/TR12?
The 1N4739P/TR12 is rated for 1.0 W steady-state power dissipation when lead temperature (TL) is maintained below 105°C at 3/8″ (10 mm) from the body. Derating is required above that temperature, per the power derating curve in Figure 1 of the datasheet.
How is polarity marked on 1N4739P/TR12?
The 1N4739P/TR12 uses a cathode band painted on the body to indicate polarity. For proper Zener operation, the banded end must be held positive relative to the unmarked (anode) end - this configuration places the device in reverse breakdown to regulate at 9.1 V.
Is 1N4739P/TR12 RoHS compliant?
Yes, the "e3" designation in Microsemi's official part numbering (e.g., 1N4739AP,e3) confirms RoHS compliance via annealed matte-tin plating. While the base part number 1N4739P/TR12 does not explicitly include "e3", it is supplied by Aetrix Electronics as RoHS-compliant per Microsemi's qualified manufacturing flow.
1N4739P/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:
- ±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/TR12 FAQ
1.How can I place an order for 1N4739P/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4739P/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 1N4739P/TR12 reliable?
The price and inventory of 1N4739P/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4739P/TR12 is usually 5 days.
3.What payment methods are accepted for 1N4739P/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4739P/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4739P/TR12?
1N4739P/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4739P/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 1N4739P/TR12?
For technical support, including 1N4739P/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4739P/TR12 requirements.
6.How does Aetrix verify that 1N4739P/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N4739P/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 1N4739P/TR12 meets industry standards.
7.What is the process for return or replacement of 1N4739P/TR12?
All 1N4739P/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4739P/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 1N4739P/TR12 part is unused and in its original packaging.
Return procedure for 1N4739P/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4739P/TR12 Tags
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MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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Diodes Incorporated
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MM5Z5V1ST1G
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Micro Commercial Co
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