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Microchip Technology 1N4681UR-1/TR
- Part No.:
- 1N4681UR-1/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AA
- Datasheet:
-
1N4681UR-1/TR.pdf
- Description:
- DIODE ZENER 2.4V 500MW DO213AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,295
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Product details
Overview
1N4681UR-1/TR from Microsemi is a 0.5 W surface-mount Zener diode in DO-213AA (SOD-80/MLL34) MELF package, rated for 2.4 V ±5% nominal Zener voltage at 50 µA test current, with 0.80 V regulation change over 10–100 µA, 2.0 µA max reverse leakage at 1.0 V, and 190 mA maximum Zener current. It delivers precision low-voltage regulation in space-constrained analog power rails.
For engineers reviewing the 1N4681UR-1/TR datasheet, 1N4681UR-1/TR pinout, 1N4681UR-1/TR application, or 1N4681UR-1/TR equivalent, key selection criteria include its ultra-low 50 µA test current, hermetically sealed glass construction, MIL-PRF-19500 up-screening capability, RoHS-compliant matte-tin plating option, and minimal 2.4 V Zener voltage drift across temperature.
Technical Context
This device operates as a two-terminal voltage reference in reverse-bias breakdown mode, optimized for low-current regulation where minimal bias current and stable low-voltage output are critical. Its metallurgically bonded silicon die and hermetic glass package ensure high reliability and radiation hardness per MicroNote 050.
The 1N4681UR-1/TR exhibits inherently low junction capacitance (typical <2 pF at 0 V), non-ESD-sensitive behavior per MIL-STD-750 Method 1020, and thermal resistance of 100 °C/W junction-to-end-cap when mounted on FR4 with recommended footprint - enabling stable operation from –65 °C to +175 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 2.4 V ±5% at IZT = 50 µA - enables precise low-voltage reference in battery-backed or ultra-low-power circuits |
| Power Dissipation (PD) | 0.5 W at TEC < 125 °C - supports continuous regulation in compact surface-mount layouts without forced cooling |
| Zener Regulation (∆VZ) | 0.80 V between 10 µA and 100 µA - ensures predictable voltage stability across wide bias current variation |
| Reverse Leakage (IR) | 2.0 µA max at VR = 1.0 V - minimizes standby current draw in always-on sensing or monitoring nodes |
| Max Zener Current (IZM) | 190 mA - defines safe DC operating limit under full-rated power at ambient ≤50 °C |
| Junction Temp Range | –65 °C to +175 °C - suitable for extended-temperature industrial, aerospace, and downhole applications |
| Package | DO-213AA (SOD-80/MLL34) MELF - provides hermetic sealing, high reliability, and compatibility with standard MELF pick-and-place |
Pinout & Package
DO-213AA (SOD-80/MLL34) MELF glass package: cylindrical hermetically sealed body with metallized end caps; cathode indicated by single black band; polarity: banded end is cathode (Zener anode is unmarked end).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Zener output terminal | Connected to regulated voltage node; must be held at higher potential than anode during regulation |
| Anode (unmarked end) | Zener return terminal | Connected to circuit ground or lower-potential rail; completes Zener conduction path |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass MELF construction | Eliminates moisture ingress and long-term parameter drift - critical for mission-critical analog references |
| Metallurgical die bonding | Enables high thermal conductivity and mechanical robustness - supports shock/vibration resilience per MIL-PRF-19500 |
| Ultra-low 50 µA Zener test current | Reduces quiescent current burden in energy-harvesting or coin-cell-powered systems |
| RoHS-compliant matte-tin plating | Ensures solderability per MIL-STD-750 Method 2026 and lead-free assembly compatibility (commercial grade only) |
| Radiation-hardened design | Validated per Microsemi MicroNote 050 - suitable for low-dose space and nuclear instrumentation environments |
Applications
| Low-Power Sensor Biasing | Reference Voltage for ADCs |
|---|---|
Use Scenario: Providing stable 2.4 V bias to MEMS pressure sensors in battery-operated IoT nodes. IC Role / Device Role / Timing Role: Two-terminal shunt voltage reference regulating sensor excitation voltage. Use Value: Ultra-low 50 µA test current extends battery life; ±5% tolerance meets 12-bit ADC reference accuracy requirements. | Use Scenario: Supplying reference voltage to 12-bit SAR ADCs in portable medical monitors. IC Role / Device Role / Timing Role: Precision analog voltage source establishing ADC full-scale input range. Use Value: Low 0.80 V regulation change ensures consistent LSB size across varying supply conditions. |
| Overvoltage Clamp for MCU I/O | Low-Voltage Power Rail Stabilization |
Use Scenario: Protecting 3.3 V GPIO pins against transient overvoltage in industrial PLC modules. IC Role / Device Role / Timing Role: Reverse-biased Zener clamping ESD and surge events to safe voltage level. Use Value: Hermetic DO-213AA package withstands repeated ESD strikes per MIL-STD-750 Method 1020. | Use Scenario: Stabilizing 2.4 V auxiliary rail for real-time clock (RTC) backup in automotive infotainment head units. IC Role / Device Role / Timing Role: Shunt regulator maintaining RTC VBACKUP during main supply brownouts. Use Value: –65 °C to +175 °C operating range ensures functionality across engine bay thermal cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX55C2V4 (ON Semiconductor) | Same 2.4 V ±5%, but DO-35 through-hole package; 500 mW rating; 100 µA test current | Requires PCB through-hole mounting; higher test current increases standby power | Select when legacy through-hole assembly or higher thermal mass is preferred |
| MMSZ4681T1G (onsemi) | SOD-123 surface-mount package; same 2.4 V ±5%; 50 µA test current; 500 mW rating | Smaller footprint but plastic package - no hermetic seal or radiation hardness | Select when cost and board density outweigh reliability and environmental robustness requirements |
Compared with BZX55C2V4 and MMSZ4681T1G, the 1N4681UR-1/TR uniquely combines hermetic DO-213AA packaging, metallurgical die bonding, radiation hardness, and ultra-low 50 µA test current - making it optimal for high-reliability, low-power, extended-temperature applications where long-term parametric stability is mandatory.
Availability
1N4681UR-1/TR is available at Aetrix Electronics and suitable for low-power sensor biasing, precision ADC reference generation, overvoltage protection, and extended-temperature power rail stabilization requiring stable component supply and traceable sourcing.
Supply support for 1N4681UR-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 Corporation (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability analog, RF, and radiation-hardened components for aerospace, defense, and industrial markets.
The 1N4681UR-1/TR belongs to Microsemi's legacy 1N4678UR-1 through 1N4717UR-1 Zener series, engineered for precision low-voltage regulation in harsh environments where hermeticity, thermal stability, and long-term reliability are non-negotiable.
FAQ
What is the Zener voltage tolerance for 1N4681UR-1/TR?
The 1N4681UR-1/TR has a nominal Zener voltage of 2.4 V with a standard tolerance of ±5%, as specified in the Electrical Characteristics table on page 3 of T4-LDS-0240-1 Rev. 2. Tighter 2% and 1% tolerances are available under different part number suffixes (C and D), but the "UR-1" base designation indicates ±5%.
Is 1N4681UR-1/TR RoHS compliant?
Yes, the 1N4681UR-1/TR is available in RoHS-compliant version with matte-tin plating (designated by "e3" in nomenclature), but only for commercial-grade units. The RoHS-compliant variant meets MIL-STD-750 solderability requirements and is marked accordingly per the part nomenclature guide on page 2 of the datasheet.
What does the "TR" suffix mean in 1N4681UR-1/TR?
The "TR" suffix indicates tape-and-reel packaging per EIA-481-1-B standard, enabling automated SMT placement. This is a packaging option - not a functional or electrical variant - and applies to all parts in the 1N4678UR-1 through 1N4717UR-1 series when ordered in reel format.
Can 1N4681UR-1/TR be used in high-reliability aerospace applications?
Yes - the 1N4681UR-1/TR supports MIL-PRF-19500 up-screening (JAN/JANTX/JANTXV/JANS levels) via appropriate reliability-level prefixes (MQ/MX/MV/MSP). Its hermetic DO-213AA package, metallurgical die bond, and radiation hardness per MicroNote 050 make it suitable for aerospace and defense applications when procured with qualified screening.
What is the maximum reverse leakage current for 1N4681UR-1/TR at 1.0 V?
The maximum reverse leakage current (IR) for 1N4681UR-1/TR is 2.0 µA at VR = 1.0 V and TA = 25 °C, as specified in the Electrical Characteristics table on page 3 of the datasheet. This low leakage supports ultra-low-power operation in always-on monitoring circuits.
1N4681UR-1/TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-213AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 2.4 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- -
- Current - Reverse Leakage @ Vr:
- 2 µA @ 1 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.5 V @ 100 mA
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-213AA
1N4681UR-1/TR FAQ
1.How can I place an order for 1N4681UR-1/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4681UR-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 1N4681UR-1/TR reliable?
The price and inventory of 1N4681UR-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 1N4681UR-1/TR is usually 5 days.
3.What payment methods are accepted for 1N4681UR-1/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4681UR-1/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4681UR-1/TR?
1N4681UR-1/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4681UR-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 1N4681UR-1/TR?
For technical support, including 1N4681UR-1/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4681UR-1/TR requirements.
6.How does Aetrix verify that 1N4681UR-1/TR is sourced from the original manufacturer or authorized distributors?
All 1N4681UR-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 1N4681UR-1/TR meets industry standards.
7.What is the process for return or replacement of 1N4681UR-1/TR?
All 1N4681UR-1/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N4681UR-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 1N4681UR-1/TR part is unused and in its original packaging.
Return procedure for 1N4681UR-1/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4681UR-1/TR Tags
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