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Microchip Technology 1N4687UR-1/TR
- Part No.:
- 1N4687UR-1/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AA
- Datasheet:
-
1N4687UR-1/TR.pdf
- Description:
- DIODE ZENER 4.3V 500MW DO213AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,783
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Product details
Overview
1N4687UR-1/TR from Microsemi is a 4.3 V, ±5% tolerance, 500 mW surface-mount Zener diode in DO-213AA (SOD-80/MLL34) MELF glass package, rated for junction temperatures from –65 °C to +175 °C and tested at 50 µA Zener current; used for precision voltage regulation in low-power analog reference and bias circuits.
For engineers reviewing the 1N4687UR-1/TR datasheet, 1N4687UR-1/TR pinout, 1N4687UR-1/TR application, or 1N4687UR-1/TR equivalent, key selection criteria include its low 50 µA test current, 0.99 V regulation deviation (ΔVZ), 4.0 µA max reverse leakage at 1.0 V, hermetic glass construction, and MIL-PRF-19500 up-screening capability.
Technical Context
This device operates as a two-terminal voltage reference in reverse-bias breakdown mode, with Zener voltage specified at 4.3 V ±5% under 50 µA test current (IZT). Its regulation deviation of 0.99 V between 10 µA and 100 µA reflects stable knee behavior suitable for low-current biasing.
The DO-213AA package uses metallurgically bonded metal end caps sealed to glass, delivering hermeticity, radiation hardness per MicroNote 050, and ESD immunity per MIL-STD-750 Method 1020 - critical for aerospace and high-reliability industrial control systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 4.3 V ±5% at IZT = 50 µA - defines nominal regulation point for low-current reference design. |
| Power Dissipation (PD) | 0.5 W at TEC ≤ 125 °C - supports continuous operation in compact, unheatsinked PCB layouts. |
| Regulation Deviation (ΔVZ) | 0.99 V (100 µA – 10 µA) - quantifies voltage stability across operating current range. |
| Reverse Leakage (IR) | 4.0 µA max at VR = 1.0 V - ensures minimal error contribution in high-impedance bias networks. |
| Junction Temp Range | –65 °C to +175 °C - enables deployment in extended-temperature avionics and downhole instrumentation. |
| Thermal Resistance (RθJA) | 250 °C/W on FR4 - informs derating requirements when ambient exceeds 50 °C. |
Pinout & Package
DO-213AA (SOD-80 / MLL34) MELF glass package: hermetically sealed cylindrical body with metallurgically bonded tin-lead or matte-tin plated end caps; cathode indicated by single band; polarity: banded end is cathode (positive during Zener operation).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unbanded end) | Forward conduction terminal / Zener reference ground | Connected to circuit ground or lower-potential node; carries forward current or reverse leakage path. |
| Cathode (banded end) | Zener regulation output / reference voltage node | Provides stabilized 4.3 V relative to anode; must be biased positive w.r.t. anode for breakdown operation. |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass MELF construction | Eliminates moisture ingress and long-term parameter drift in humid or corrosive environments. |
| Metallurgical die bonding | Ensures mechanical robustness and thermal reliability under thermal cycling and vibration stress. |
| Low 50 µA Zener test current | Enables use in ultra-low-power sensor biasing and battery-operated reference circuits. |
| MIL-PRF-19500 up-screening option | Supports qualification for military/aerospace applications requiring enhanced screening and traceability. |
| Non-ESD-sensitive design | Withstands handling without special ESD controls per MIL-STD-750 Method 1020. |
Applications
| Industrial Sensor Biasing | Aerospace Power Monitoring |
|---|---|
Use Scenario: Providing stable bias voltage to bridge-based pressure sensors in factory automation PLC modules. IC Role / Device Role / Timing Role: Two-terminal Zener reference regulating 4.3 V for op-amp excitation and ADC reference scaling. Use Value: Low 50 µA test current minimizes loading on high-impedance sensor signal chains while maintaining ±5% accuracy over –40 °C to +85 °C. |
Use Scenario: Voltage clamping and reference generation in satellite power bus monitoring circuits exposed to radiation. IC Role / Device Role / Timing Role: Radiation-hardened Zener regulator establishing fault-detection thresholds for 28 V primary bus supervision. Use Value: Inherent radiation hardness (per MicroNote 050) and hermetic DO-213AA packaging ensure long-term parametric stability in LEO orbit environments. |
| Medical Instrumentation Reference | Downhole Oilfield Electronics |
Use Scenario: Generating precision analog reference for portable ECG front-end amplifiers with strict low-noise requirements. IC Role / Device Role / Timing Role: Low-capacitance (typ. <1.5 pF) Zener node supplying clean 4.3 V to instrumentation amplifier bias network. Use Value: Minimal junction capacitance avoids signal coupling and phase shift in high-gain, DC-coupled biopotential paths. |
Use Scenario: Regulating auxiliary supply rails in high-temperature logging tools deployed at >150 °C wellbore depths. IC Role / Device Role / Timing Role: High-temperature-stable Zener providing 4.3 V reference for downhole microcontroller reset and ADC calibration. Use Value: Guaranteed operation from –65 °C to +175 °C and metallurgical bond integrity enable reliable function where silicon-based regulators fail. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX55C4V3 (Vishay) | Same 4.3 V ±5%, but DO-35 through-hole package; higher RθJA (350 °C/W); no MIL-PRF-19500 screening option. | Limited to commercial-grade PCBs without hermetic sealing or radiation hardening requirements. | Choose for cost-sensitive, non-military designs where surface-mount assembly is not required. |
| MMBZ5225BS (ON Semiconductor) | SOT-23 package; 4.3 V ±5%; 200 mW rating; 10 µA IZT; higher leakage (10 µA @ 1 V). | Higher board density but reduced power margin and temperature range (–65 °C to +150 °C). | Prefer for space-constrained consumer electronics where full 0.5 W dissipation is unnecessary. |
Compared with BZX55C4V3 and MMBZ5225BS, the 1N4687UR-1/TR delivers superior thermal performance in surface-mount form, hermetic reliability for harsh environments, and qualification pathways for high-reliability programs - making it the only choice when DO-213AA mechanical robustness and extended temperature compliance are mandatory.
Availability
1N4687UR-1/TR is available at Aetrix Electronics and suitable for industrial sensor biasing, aerospace power monitoring, and downhole oilfield electronics requiring stable component supply across extended temperature and radiation-exposed operating conditions.
Supply support for 1N4687UR-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, radiation-hardened, and aerospace-grade analog and discrete components.
The 1N4687UR-1/TR belongs to Microsemi's legacy DO-213AA Zener series engineered for mission-critical voltage regulation where hermeticity, temperature resilience, and MIL-spec screening are essential - particularly in defense, space, and energy exploration systems.
FAQ
What is the Zener voltage tolerance and test condition for 1N4687UR-1/TR?
The 1N4687UR-1/TR has a nominal Zener voltage of 4.3 V with a standard tolerance of ±5%, measured at a Zener test current (IZT) of 50 µA and ambient temperature of 25 °C. This tolerance applies to the commercial-grade version; tighter 2% and 1% options are available under different suffixes per the part nomenclature guide.
Does 1N4687UR-1/TR support MIL-PRF-19500 up-screening?
Yes, the 1N4687UR-1/TR is available with MIL-PRF-19500 up-screening upon request - including additional environmental, electrical, and quality assurance testing beyond commercial specifications. Screening levels (e.g., JAN, JANTX, JANTXV) are designated via prefix codes in the full part number, not in the base 1N4687UR-1/TR designation.
What is the maximum reverse leakage current for 1N4687UR-1/TR at 1.0 V?
The maximum reverse leakage current (IR) for 1N4687UR-1/TR is 4.0 µA when measured at VR = 1.0 V and TA = 25 °C. This low leakage supports high-impedance bias networks and minimizes error in precision analog circuits where load currents are sub-microampere.
Is 1N4687UR-1/TR RoHS compliant?
Yes, the 1N4687UR-1/TR is available in RoHS-compliant versions marked with the "e3" suffix (e.g., 1N4687UR-1/TR e3), featuring matte-tin plating on end caps. RoHS compliance is limited to commercial-grade devices; screened versions follow legacy MIL-spec plating requirements.
What package type and dimensions does 1N4687UR-1/TR use?
The 1N4687UR-1/TR uses the DO-213AA (SOD-80 / MLL34) MELF glass package: cylindrical, hermetically sealed, with overall dimensions of 1.60–1.70 mm diameter (A) and 3.30–3.70 mm length (B). The cathode is marked by a single band; polarity is critical - banded end is cathode.
1N4687UR-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):
- 4.3 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- -
- Current - Reverse Leakage @ Vr:
- 4 µA @ 2 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
1N4687UR-1/TR FAQ
1.How can I place an order for 1N4687UR-1/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4687UR-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 1N4687UR-1/TR reliable?
The price and inventory of 1N4687UR-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 1N4687UR-1/TR is usually 5 days.
3.What payment methods are accepted for 1N4687UR-1/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4687UR-1/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4687UR-1/TR?
1N4687UR-1/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4687UR-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 1N4687UR-1/TR?
For technical support, including 1N4687UR-1/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4687UR-1/TR requirements.
6.How does Aetrix verify that 1N4687UR-1/TR is sourced from the original manufacturer or authorized distributors?
All 1N4687UR-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 1N4687UR-1/TR meets industry standards.
7.What is the process for return or replacement of 1N4687UR-1/TR?
All 1N4687UR-1/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N4687UR-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 1N4687UR-1/TR part is unused and in its original packaging.
Return procedure for 1N4687UR-1/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4687UR-1/TR Tags
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