My Inquiry
My Account
Microchip Technology 1N4704UR-1/TR
- Part No.:
- 1N4704UR-1/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AA
- Datasheet:
-
1N4704UR-1/TR.pdf
- Description:
- DIODE ZENER 17V 500MW DO213AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,400
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1N4704UR-1/TR from Microsemi is a 500 mW surface-mount Zener diode in DO-213AA (SOD80/MLL34) MELF package, rated for 17.0 V nominal Zener voltage at 50 µA test current, ±5% tolerance, with 0.17 V regulation change between 10 µA and 100 µA and 0.05 µA max reverse leakage at 12.9 V. It delivers stable voltage reference in precision power supply feedback loops.
For engineers reviewing the 1N4704UR-1/TR datasheet, 1N4704UR-1/TR pinout, 1N4704UR-1/TR application, or 1N4704UR-1/TR equivalent, key selection criteria include low test current (50 µA), hermetic glass packaging, MIL-PRF-19500 up-screening capability, minimal capacitance (<1.5 pF), and radiation-hardened construction per MicroNote 050.
Technical Context
This Zener regulator operates in reverse breakdown with metallurgically bonded silicon die sandwiched between metal end caps, enabling high reliability and thermal stability. Its low 50 µA test current supports ultra-low-power biasing while maintaining tight regulation (ΔVZ = 0.17 V) across operating current range.
The DO-213AA package provides hermetic sealing and inherent radiation hardness, with thermal resistance of 100 °C/W junction-to-end-cap and 250 °C/W junction-to-ambient on FR4. Polarity is marked by cathode band; device regulates with banded end positive relative to unmarked end.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 17.0 V at IZT = 50 µA - defines primary regulation point for feedback networks |
| Zener Tolerance | ±5% - standard grade; 2% and 1% options available for tighter reference accuracy |
| Voltage Regulation (ΔVZ) | 0.17 V - difference between VZ at 100 µA and 10 µA, indicating knee sharpness |
| Max Reverse Leakage | 0.05 µA at 12.9 V - ensures minimal error current in high-impedance reference paths |
| Power Dissipation | 0.5 W - derates linearly above 50 °C ambient or 125 °C end-cap temperature |
| Junction Temp Range | –65 °C to +175 °C - supports extended industrial and aerospace environments |
| Package | DO-213AA (SOD80/MLL34) MELF - hermetically sealed glass, RoHS-compliant matte-tin plating |
Pinout & Package
DO-213AA (SOD80/MLL34) MELF package: cylindrical glass body with metallized end caps; cathode identified by single black band on one end cap. No discrete pins - terminals are axial end caps soldered directly to PCB pads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Regulated output node | Connected to higher potential in Zener mode; supplies stable reference voltage to feedback circuitry |
| Anode (unbanded end) | Reference ground node | Connected to lower potential; forms return path for Zener current and sets regulation polarity |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass MELF construction | Prevents moisture ingress and long-term parameter drift; enables >20-year field reliability |
| Metallurgical die bonding | Eliminates wire bonds and interfacial delamination risks under thermal cycling |
| MIL-PRF-19500 up-screening option | Supports high-reliability programs requiring screening to military specification levels |
| Radiation hardness | Inherently resistant to total ionizing dose (TID) per MicroNote 050 - suitable for space-qualified designs |
| Low 50 µA test current | Enables use in micropower applications where bias current must remain below 100 µA |
Applications
| Switch-Mode Power Supply Feedback | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Regulating output voltage in isolated flyback converters via optocoupler-coupled feedback loop. IC Role / Device Role / Timing Role: Zener reference providing precise 17.0 V threshold to TL431-like shunt regulator IC. Use Value: Tight ΔVZ (0.17 V) minimizes output voltage drift across load and line variations. | Use Scenario: Biasing bridge-based pressure transducers in factory automation systems. IC Role / Device Role / Timing Role: Stable excitation reference for Wheatstone bridge, rejecting supply ripple. Use Value: Low 0.05 µA leakage prevents offset errors in high-impedance sensor interfaces. |
| Aerospace Power Monitoring | Medical Instrument Reference |
Use Scenario: Voltage monitoring in satellite DC bus subsystems exposed to radiation. IC Role / Device Role / Timing Role: Radiation-hardened Zener element in overvoltage protection comparator input stage. Use Value: Inherent TID hardness per MicroNote 050 eliminates need for shielding or derating. | Use Scenario: Precision reference for analog front-end ADC drivers in portable ECG units. IC Role / Device Role / Timing Role: Low-noise, low-drift voltage clamp stabilizing op-amp bias rails. Use Value: Hermetic DO-213AA package prevents humidity-induced long-term drift in clinical environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX55C18 | 18 V nominal, ±5%, 500 mW, DO-35 package - larger footprint, non-hermetic epoxy | Not suitable for radiation-hardened or high-reliability sealed environments | Select when cost sensitivity outweighs hermeticity and radiation requirements |
| MMBZ5242B | 17 V nominal, ±5%, 350 mW, SOT-23 - surface-mount but plastic, higher leakage (1 µA) | Lower power rating and higher leakage limit use in precision references | Select only for space-constrained consumer-grade designs where 0.5 W dissipation is not required |
Compared with BZX55C18 and MMBZ5242B, the 1N4704UR-1/TR offers superior long-term stability via hermetic glass packaging, lower leakage, and radiation hardness - critical for aerospace, medical, and industrial control applications demanding >15-year operational life.
Availability
1N4704UR-1/TR is available at Aetrix Electronics and suitable for switch-mode power supply feedback, industrial sensor signal conditioning, aerospace power monitoring, and medical instrument reference applications requiring stable component supply across extended temperature and radiation environments.
Supply support for 1N4704UR-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) specialized in high-reliability analog and mixed-signal semiconductors for aerospace, defense, and industrial markets.
The 1N4704UR-1/TR belongs to Microsemi's legacy DO-213AA Zener family designed for applications demanding hermetic sealing, radiation tolerance, and stable voltage reference under extreme thermal and environmental stress.
FAQ
What is the Zener voltage and tolerance of the 1N4704UR-1/TR?
The 1N4704UR-1/TR has a nominal Zener voltage of 17.0 V at 50 µA test current with a standard tolerance of ±5%. Tighter tolerances of ±2% and ±1% are available under different part number suffixes. This voltage defines its primary regulation point in feedback and reference circuits.
Is the 1N4704UR-1/TR RoHS compliant?
Yes, the 1N4704UR-1/TR is RoHS compliant (commercial grade only) with matte-tin plating on end caps, meeting exemption 7a for lead in high-melting-temperature type solders. The "e3" designation in the full nomenclature confirms RoHS compliance per Microsemi documentation.
What package type does the 1N4704UR-1/TR use, and how is polarity marked?
The 1N4704UR-1/TR uses the DO-213AA (SOD80/MLL34) MELF glass package. Polarity is marked by a single black cathode band on one metal end cap; the device regulates with the banded end held positive relative to the unbanded anode end.
Can the 1N4704UR-1/TR be used in radiation-exposed environments?
Yes, the 1N4704UR-1/TR is inherently radiation hard per Microsemi MicroNote 050 due to its metallurgically bonded silicon die and hermetic glass construction. It is qualified for use in low-earth orbit and nuclear instrumentation where total ionizing dose (TID) resistance is required.
What is the maximum reverse leakage current for the 1N4704UR-1/TR, and at what voltage is it specified?
The maximum reverse leakage current for the 1N4704UR-1/TR is 0.05 µA, specified at a reverse voltage (VR) of 12.9 V. This ultra-low leakage supports high-impedance reference applications where even nanoamp-level currents would introduce measurable error.
1N4704UR-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):
- 17 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- -
- Current - Reverse Leakage @ Vr:
- 50 nA @ 12.9 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
1N4704UR-1/TR FAQ
1.How can I place an order for 1N4704UR-1/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4704UR-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 1N4704UR-1/TR reliable?
The price and inventory of 1N4704UR-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 1N4704UR-1/TR is usually 5 days.
3.What payment methods are accepted for 1N4704UR-1/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4704UR-1/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4704UR-1/TR?
1N4704UR-1/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4704UR-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 1N4704UR-1/TR?
For technical support, including 1N4704UR-1/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4704UR-1/TR requirements.
6.How does Aetrix verify that 1N4704UR-1/TR is sourced from the original manufacturer or authorized distributors?
All 1N4704UR-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 1N4704UR-1/TR meets industry standards.
7.What is the process for return or replacement of 1N4704UR-1/TR?
All 1N4704UR-1/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N4704UR-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 1N4704UR-1/TR part is unused and in its original packaging.
Return procedure for 1N4704UR-1/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4704UR-1/TR Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
