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Microchip Technology 1N4739AUR/TR
- Part No.:
- 1N4739AUR/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AB, MELF (Glass)
- Datasheet:
-
1N4739AUR/TR.pdf
- Description:
- DIODE ZENER 9.1V 1W DO213AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,117
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Product details
Overview
1N4739AUR/TR from Microsemi is a surface-mount 1.0 W glass-encapsulated Zener diode with nominal Zener voltage 9.1 V, ±5% tolerance, 5.0 Ω dynamic impedance at 28 mA test current, and maximum reverse leakage of 7 μA at 7.3 V. It operates from –65°C to +175°C and is used for precision voltage regulation in high-density power supply rails and reference circuits.
For engineers reviewing the 1N4739AUR/TR datasheet, 1N4739AUR/TR pinout, 1N4739AUR/TR application, or 1N4739AUR/TR equivalent, key selection criteria include Zener voltage stability over temperature, low dynamic impedance for tight regulation, hermetic glass MELF package reliability, and RoHS-compliant (e3) tape-and-reel availability.
Technical Context
This device implements a single-junction silicon Zener diode structure optimized for stable reverse-breakdown operation under DC and low-frequency AC conditions. Its DO-213AB glass MELF package provides hermetic sealing and low parasitic capacitance (specified in Figure 2), supporting high-reliability and radiation-hardened applications per MicroNote 050.
The 1N4739AUR/TR delivers regulated 9.1 V output across a wide operating current range (IZK = 0.5 mA to IZM = 500 mA), with thermal resistance of 130°C/W junction-to-ambient on FR4 PCB (1 oz Cu). Forward voltage is ≤1.2 V at 200 mA, confirming standard PN junction behavior in forward bias.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 9.1 V ±5% - defines precise regulation point for feedback loops and reference generation |
| Power Dissipation | 1.0 W at TEC < 125°C - supports continuous operation in compact thermal environments |
| Dynamic Impedance (ZZT) | 5.0 Ω @ 28 mA - ensures minimal output voltage variation under load transients |
| Reverse Leakage Current | 7 μA @ 7.3 V - guarantees low quiescent power loss in standby regulation |
| Operating Temperature | –65°C to +175°C - enables deployment in aerospace, downhole, and industrial control systems |
| Package Type | DO-213AB glass MELF - provides hermeticity, ESD immunity, and radiation hardness |
| Thermal Resistance | 130°C/W junction-to-ambient (FR4, 1 oz Cu) - informs heatsinking and layout requirements |
Pinout & Package
DO-213AB glass MELF package: cylindrical, leadless, hermetically sealed glass body with cathode band marking. Dimensions: A = 2.39–2.66 mm (diameter), B = 4.80–5.20 mm (length), C = 0.41–0.55 mm (band width). Cathode indicated by single black band; device operated with banded end positive for Zener regulation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference | Connected to lower-potential node; forms regulated output when cathode is biased above anode |
| Cathode | Zener breakdown terminal / regulation output | Banded end; connected to higher-potential rail; delivers stable 9.1 V relative to anode under reverse bias |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass MELF construction | Enables operation in harsh environments including high humidity, vacuum, and radiation-exposed systems |
| ±5% Zener voltage tolerance (A suffix) | Reduces need for post-assembly trimming in mid-precision voltage references |
| Low dynamic impedance (5.0 Ω) | Maintains regulation accuracy during rapid load-current changes in switching power supplies |
| RoHS-compliant (e3) termination | Supports lead-free reflow soldering at 260°C for 10 s without degradation |
| Nonsensitive to ESD | Eliminates need for external protection circuitry in handling and board-level integration |
Applications
| Power Supply Voltage Reference | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Stabilizing feedback node in isolated DC-DC converter secondary-side regulation. IC Role / Device Role / Timing Role: Zener diode providing fixed 9.1 V reference for optocoupler-based error amplifier input. Use Value: Enables ±1% output voltage accuracy across –40°C to +125°C ambient with no active compensation. | Use Scenario: Clamping transient spikes on 12 V automotive sensor supply lines. IC Role / Device Role / Timing Role: Passive shunt protector diverting surge energy above 9.1 V to ground before IC damage occurs. Use Value: Withstands 500 mA peak surge current (IS) and maintains clamping voltage within 10% of nominal under pulse stress. |
| High-Reliability Instrumentation Reference | Radiation-Hardened Subsystem Bias |
Use Scenario: Generating stable bias voltage for precision op-amp input stages in medical analyzers. IC Role / Device Role / Timing Role: Low-noise, low-drift voltage source replacing larger, less stable alternatives. Use Value: Hermetic glass package prevents parameter drift due to moisture ingress over 15+ year field life. | Use Scenario: Providing regulated bias for analog front-end amplifiers in satellite telemetry modules. IC Role / Device Role / Timing Role: Radiation-hardened Zener reference compliant with MicroNote 050 specifications. Use Value: Maintains Zener voltage stability after total ionizing dose (TID) exposure up to 100 krad(Si). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4739A-T | Same 9.1 V ±5%, but in DO-41 axial package; higher thermal resistance (75°C/W junction-to-lead) | Requires through-hole mounting and larger board area; unsuitable for high-density SMT layouts | Select 1N4739AUR/TR for space-constrained, automated assembly; choose 1N4739A-T only if legacy through-hole compatibility is mandatory |
| SMAJ4739A | Same electrical specs, but in SMA package; plastic body, non-hermetic, lower max temp (150°C) | Lacks radiation hardness and long-term hermetic reliability; not qualified to MIL-PRF-19500 screening levels | Use SMAJ4739A where cost and volume outweigh reliability requirements; retain 1N4739AUR/TR for aerospace, defense, or extended-life deployments |
Compared with 1N4739A-T and SMAJ4739A, the 1N4739AUR/TR uniquely combines surface-mount compatibility, hermetic glass reliability, full –65°C to +175°C operation, and radiation hardness-making it the only option qualified for mission-critical, high-temperature, or radiation-exposed use cases.
Availability
1N4739AUR/TR is available at Aetrix Electronics and suitable for voltage reference design, overvoltage protection circuits, and high-reliability instrumentation requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for 1N4739AUR/TR 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, radiation-hardened, and high-voltage analog components for aerospace, defense, and industrial markets.
The 1N4739AUR/TR belongs to Microsemi's surface-mount Zener diode family designed specifically for applications demanding hermetic sealing, extreme temperature resilience, and proven radiation tolerance-targeting avionics, downhole tools, and medical safety systems.
FAQ
What is the Zener voltage tolerance for the 1N4739AUR/TR?
The 1N4739AUR/TR has a nominal Zener voltage of 9.1 V with a tolerance of ±5%, as indicated by the "A" suffix in its part number. This tolerance is verified at 30°C with 90-second stabilization time after DC current application, per Microsemi's test methodology documented in the datasheet revision D.
Does the 1N4739AUR/TR require a heatsink in typical PCB applications?
No, the 1N4739AUR/TR does not require an external heatsink when mounted on FR4 with 1 oz copper using the recommended pad layout. Its thermal resistance is 130°C/W junction-to-ambient, and at 1.0 W dissipation, junction temperature rise remains within safe limits (<125°C) at ambient temperatures below 45°C.
Is the 1N4739AUR/TR compatible with lead-free reflow soldering processes?
Yes, the 1N4739AUR/TR is RoHS-compliant (e3 suffix) and rated for lead-free reflow soldering at 260°C for up to 10 seconds. Its glass MELF body and annealed matte-tin plating meet MIL-STD-750 Method 2026 for solderability, ensuring reliable joint formation without cracking or delamination.
How does the 1N4739AUR/TR compare to the 1N4739A in terms of thermal performance?
The 1N4739AUR/TR uses a DO-213AB glass MELF package with 130°C/W junction-to-ambient thermal resistance on FR4, while the axial 1N4739A (DO-41) has 75°C/W junction-to-lead but significantly higher effective ambient resistance due to limited PCB heat spreading. Thus, the 1N4739AUR/TR achieves better system-level thermal management in dense SMT layouts.
Can the 1N4739AUR/TR be used in radiation-intensive environments such as space applications?
Yes, the 1N4739AUR/TR is inherently radiation-hardened per MicroNote 050 and qualifies for use in space-grade subsystems. Its hermetic glass MELF construction prevents parametric shift under total ionizing dose (TID), and it is available with JAN/JANTXV screening prefixes for full MIL-PRF-19500 compliance when ordered with appropriate prefixes.
1N4739AUR/TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-213AB, MELF (Glass)
- 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 ~ 175°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-213AB (MELF, LL41)
1N4739AUR/TR FAQ
1.How can I place an order for 1N4739AUR/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4739AUR/TR 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 1N4739AUR/TR reliable?
The price and inventory of 1N4739AUR/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4739AUR/TR is usually 5 days.
3.What payment methods are accepted for 1N4739AUR/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4739AUR/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4739AUR/TR?
1N4739AUR/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4739AUR/TR 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 1N4739AUR/TR?
For technical support, including 1N4739AUR/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4739AUR/TR requirements.
6.How does Aetrix verify that 1N4739AUR/TR is sourced from the original manufacturer or authorized distributors?
All 1N4739AUR/TR 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 1N4739AUR/TR meets industry standards.
7.What is the process for return or replacement of 1N4739AUR/TR?
All 1N4739AUR/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N4739AUR/TR, 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 1N4739AUR/TR part is unused and in its original packaging.
Return procedure for 1N4739AUR/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4739AUR/TR Tags
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MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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Diodes Incorporated
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Diodes Incorporated
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MM5Z5V1ST1G
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SMAJ4744A-TP
Micro Commercial Co
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BZT52C3V6LP-7
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SMAZ12-13-F
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