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Microchip Technology 1N4754UR-1/TR
- Part No.:
- 1N4754UR-1/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AB, MELF (Glass)
- Datasheet:
-
1N4754UR-1/TR.pdf
- Description:
- DIODE ZENER 39V 1W DO213AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,058
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Product details
Overview
1N4754UR-1/TR from Microsemi is a surface-mount 1.0 W glass Zener diode with nominal Zener voltage 39 V, ±5% tolerance (A-suffix), 6.5 mA test current (IZT), 60 Ω dynamic impedance (ZZT), and 5 μA maximum reverse leakage at 29.7 V. It operates from –65 °C to +175 °C and is used for precision voltage regulation in high-density power supply feedback loops and reference circuits.
For engineers reviewing the 1N4754UR-1/TR datasheet, 1N4754UR-1/TR pinout, 1N4754UR-1/TR application, or 1N4754UR-1/TR equivalent, key selection criteria include Zener voltage stability across temperature, low dynamic impedance for tight regulation, hermetic DO-213AB glass MELF packaging, and RoHS-compliant (e3) termination options with tape-and-reel delivery (TR suffix).
Technical Context
This device implements a silicon planar Zener junction in a hermetically sealed glass MELF (DO-213AB) package, enabling stable breakdown behavior over wide temperature and current ranges. Its 39 V nominal Zener voltage is specified at 6.5 mA IZT with 60 Ω dynamic impedance and 23 Ω knee impedance at 0.25 mA IZK.
The 1N4754UR-1/TR supports steady-state dissipation of 1.0 W up to 125 °C case temperature (TEC), derating linearly to zero at 175 °C, and exhibits 0.05 g mass, 1.2 V max forward voltage at 200 mA, and 1000 mA surge current rating per half-sine pulse.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 39 V ±5% at 6.5 mA - defines regulated output level in feedback networks |
| Power Dissipation | 1.0 W at TC ≤ 125 °C - sets thermal design margin for PCB layout and heatsinking |
| Dynamic Impedance (ZZT) | 60 Ω at IZT = 6.5 mA - determines load regulation error under varying current |
| Knee Impedance (ZZK) | 23 Ω at IZK = 0.25 mA - ensures stable regulation even near minimum operating current |
| Reverse Leakage (IR) | 5 μA max at VR = 29.7 V - limits quiescent current in high-impedance bias networks |
| Operating Temperature | –65 °C to +175 °C - enables use in automotive under-hood and industrial control environments |
| Package | DO-213AB glass MELF - provides hermetic sealing, low parasitic capacitance, and ESD immunity |
Pinout & Package
DO-213AB glass MELF package: cylindrical, leadless, hermetically sealed glass body with cathode band marking. Cathode is banded end; device must be reverse-biased (cathode positive) for Zener operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Ground/reference node in Zener regulator | Connected to system ground or lower-potential rail; carries full Zener current |
| Cathode | Regulated output node | Banded end; connected to feedback point or voltage reference; holds 39 V relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass MELF construction | Eliminates moisture ingress and long-term parameter drift; qualified for high-reliability applications per source control drawing (SCD) |
| Low dynamic impedance (60 Ω) | Minimizes output voltage variation under load transients in switching power supply feedback paths |
| Wide operating temperature range (–65 °C to +175 °C) | Supports deployment in engine control units, downhole tools, and military-grade power systems |
| RoHS-compliant (e3) matte-tin plating | Enables lead-free reflow soldering at 260 °C for 10 s without degradation |
| Tape-and-reel packaging (TR suffix) | Facilitates automated SMT placement with 1500 units per 7-inch reel on 12 mm carrier tape |
Applications
| Switching Power Supply Feedback | Industrial Sensor Reference |
|---|---|
Use Scenario: Regulating output voltage in isolated flyback or forward converters via optocoupler feedback loop. IC Role / Device Role / Timing Role: Zener reference element setting precise feedback threshold for PWM controller. Use Value: 39 V Zener voltage and 60 Ω dynamic impedance ensure <±1% output regulation across line/load/temperature. |
Use Scenario: Providing stable excitation voltage for bridge-based pressure or strain sensors in PLC analog input modules. IC Role / Device Role / Timing Role: Precision shunt reference supplying constant bias to sensor Wheatstone bridge. Use Value: Hermetic DO-213AB package prevents parameter shift in humid industrial enclosures; ±5% tolerance meets 12-bit ADC reference accuracy. |
| Automotive Engine Control Unit | High-Reliability Telecom Power |
Use Scenario: Overvoltage clamp and reference in 12 V battery-supplied ECU subsystems exposed to load dump transients. IC Role / Device Role / Timing Role: Transient voltage suppression and stable 39 V reference for microcontroller reset circuitry. Use Value: 1000 mA surge rating handles ISO 7637-2 Pulse 5a; –65 °C to +175 °C range survives under-hood thermal cycling. |
Use Scenario: Secondary-side voltage reference in telecom DC/DC bricks requiring long-life field reliability. IC Role / Device Role / Timing Role: Shunt regulator establishing isolated 39 V rail for hot-swap controller supervision. Use Value: Inherent radiation hardness (MicroNote 050) and MIL-PRF-19500 screening options support 20+ year infrastructure deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4754A-TP (Micro Commercial) | Same 39 V ±5%, DO-41 axial package; higher thermal resistance (150 °C/W ambient); no hermetic seal | Suitable for cost-sensitive, non-high-reliability PCBs where through-hole mounting is acceptable | Select when board space allows axial leads and long-term parameter stability is secondary to BOM cost |
| BZX84-C39 (Diodes Inc.) | SOT-23 package; 39 V ±5%; 300 mW power rating; 90 Ω dynamic impedance; plastic encapsulation | Used in portable electronics where low profile and small footprint outweigh power/thermal needs | Choose for space-constrained designs below 300 mW dissipation; not suitable for >125 °C ambient or high-reliability use |
Compared with 1N4754UR-1/TR, the 1N4754A-TP offers identical electrical specs but lacks hermeticity and thermal performance, while the BZX84-C39 trades power handling and ruggedness for miniaturization-making the 1N4754UR-1/TR optimal for high-density, high-temperature, mission-critical regulation.
Availability
1N4754UR-1/TR is available at Aetrix Electronics and suitable for switching power supplies, industrial sensor references, and automotive engine control units requiring stable component supply, long-lifecycle availability, and traceable sourcing.
Supply support for 1N4754UR-1/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 aerospace-grade components.
The 1N4754UR-1/TR belongs to Microsemi's surface-mount Zener diode family designed for voltage regulation in harsh-environment applications demanding hermetic sealing, wide temperature operation, and stable parametric performance.
FAQ
What is the Zener voltage tolerance for 1N4754UR-1/TR?
The 1N4754UR-1/TR has a nominal Zener voltage of 39 V with ±5% tolerance, indicated by the "A" suffix in its designation. This tolerance is guaranteed at 6.5 mA test current and 30 °C junction temperature. The "UR" prefix denotes the DO-213AB surface-mount variant, and the "TR" suffix confirms tape-and-reel packaging for SMT assembly.
Does 1N4754UR-1/TR support lead-free reflow soldering?
Yes, the 1N4754UR-1/TR is RoHS-compliant (e3 suffix) and features annealed matte-tin plating qualified for lead-free reflow soldering at 260 °C for up to 10 seconds. Its DO-213AB glass MELF body withstands thermal shock without cracking, making it compatible with standard J-STD-020 profiles for Class 3 assemblies.
What is the maximum surge current rating for 1N4754UR-1/TR?
The 1N4754UR-1/TR is rated for 1000 mA maximum reverse surge current (IS), measured using a ½-sine wave pulse of 1/120 second duration at 25 °C ambient. This rating enables robust transient protection in automotive load-dump and inductive-switching scenarios where short-duration overvoltage events occur.
How does the DO-213AB package of 1N4754UR-1/TR differ from DO-41?
The DO-213AB package of the 1N4754UR-1/TR is a surface-mount glass MELF outline, whereas DO-41 is an axial-leaded through-hole package. DO-213AB provides lower parasitic inductance/capacitance, hermetic sealing, and suitability for high-density layouts-while maintaining electrical equivalence to the 1N4754A DO-41 part in Zener characteristics and thermal derating curves.
Can 1N4754UR-1/TR be used in high-temperature environments like under-hood automotive?
Yes, the 1N4754UR-1/TR is rated for continuous operation from –65 °C to +175 °C, with 1.0 W power dissipation maintained up to 125 °C case temperature (TEC). Its hermetic glass construction and radiation-hardened design make it suitable for under-hood engine control units, transmission control modules, and other high-temperature automotive subsystems.
1N4754UR-1/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):
- 39 V
- Tolerance:
- ±10%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 60 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 29.7 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)
1N4754UR-1/TR FAQ
1.How can I place an order for 1N4754UR-1/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4754UR-1/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 1N4754UR-1/TR reliable?
The price and inventory of 1N4754UR-1/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4754UR-1/TR is usually 5 days.
3.What payment methods are accepted for 1N4754UR-1/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4754UR-1/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4754UR-1/TR?
1N4754UR-1/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4754UR-1/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 1N4754UR-1/TR?
For technical support, including 1N4754UR-1/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4754UR-1/TR requirements.
6.How does Aetrix verify that 1N4754UR-1/TR is sourced from the original manufacturer or authorized distributors?
All 1N4754UR-1/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 1N4754UR-1/TR meets industry standards.
7.What is the process for return or replacement of 1N4754UR-1/TR?
All 1N4754UR-1/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N4754UR-1/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 1N4754UR-1/TR part is unused and in its original packaging.
Return procedure for 1N4754UR-1/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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