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Microchip Technology 1N4123UR/TR
- Part No.:
- 1N4123UR/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AA
- Datasheet:
-
1N4123UR/TR.pdf
- Description:
- DIODE ZENER 39V 500MW DO213AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,821
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Product details
Overview
1N4123UR/TR from Microsemi is a glass-encapsulated surface-mount Zener diode with nominal Zener voltage 39 V, ±5% tolerance, 0.5 W power rating, and DO-213AA (SOD-80/MELF) package. It regulates voltage in precision reference and overvoltage protection circuits across industrial temperature range (–65 °C to +175 °C), operating at 250 mA test current with 29.65 V minimum knee voltage.
For engineers reviewing the 1N4123UR/TR datasheet, 1N4123UR/TR pinout, 1N4123UR/TR application, or 1N4123UR/TR equivalent, key selection criteria include Zener voltage stability under varying load/temperature, low noise density (1 µV/√Hz), hermetic glass sealing for reliability in harsh environments, and compatibility with automated SMT assembly using EIA-481-1-A tape-and-reel packaging.
Technical Context
This device functions as a two-terminal voltage reference diode operating in reverse breakdown mode, with Zener impedance of 200 Ω at 250 mA test current and typical temperature coefficient of +0.090 %/°C. Its regulation performance is specified under thermal equilibrium at 25 °C with end-cap termination, and derates linearly above 25 °C ambient or 100 °C end-cap temperature.
The DO-213AA package provides hermetic glass sealing, minimal junction capacitance (≈1.5 pF at 39 V), and ESD insensitivity per MIL-STD-750 Method 1020. Forward voltage is 1.1 V at 200 mA, and maximum Zener current is 40 mA at rated power - confirming its role in low-current, high-stability reference applications rather than power clamping.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 39 V nominal at 250 mA test current; defines stable regulation point for reference circuits |
| Power Rating | 0.5 W at TEC < 100 °C or TA < 25 °C; limits continuous dissipation in PCB-mounted operation |
| Zener Impedance ZZT | 200 Ω at IZT = 250 mA; indicates voltage stability under small-signal AC perturbations |
| Temp. Coefficient αVZ | +0.090 %/°C; quantifies drift magnitude per degree Celsius for precision biasing design |
| Noise Density ND | 1 µV/√Hz at 1–3 kHz band; critical for low-noise analog references and sensor excitation |
| Max Reverse Current IR | 0.01 µA at VR = 29.65 V; ensures minimal leakage near regulation threshold |
| Forward Voltage VF | 1.1 V at 200 mA; confirms standard silicon PN junction behavior in forward conduction |
Pinout & Package
DO-213AA (SOD-80/MELF) hermetically sealed glass package with axial symmetry and cathode band marking. No discrete pins - two metallized end caps serve as anode and cathode terminals. Cathode is identified by single black band; device operates with banded end positive relative to opposite end during Zener regulation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Regulated output terminal | Connected to higher potential node; voltage referenced to anode during reverse breakdown |
| Anode (unbanded end) | Reference/ground terminal | Typically tied to circuit common or ground; establishes polarity for Zener conduction |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass encapsulation | Enables operation from –65 °C to +175 °C with zero moisture ingress risk in sealed systems |
| Low noise density (1 µV/√Hz) | Supports high-resolution ADC references and low-drift analog front-ends without added filtering |
| Minimal junction capacitance (~1.5 pF) | Preserves high-frequency signal integrity in RF bias networks and fast transient detection |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Eliminates need for handling precautions or on-board ESD protection in assembly |
| Tape-and-reel packaging (TR suffix) | Enables direct placement via standard SMT pick-and-place equipment (12 mm tape, 2000/reel) |
Applications
| Industrial Sensor Reference | Overvoltage Clamp for RS-485 |
|---|---|
|
Use Scenario: Providing stable excitation voltage to bridge-based pressure sensors in factory automation PLC modules. IC Role / Device Role / Timing Role: Two-terminal Zener reference establishing 39 V rail for Wheatstone bridge biasing and ADC input scaling. Use Value: Temperature coefficient of +0.090 %/°C ensures <±0.5% drift over –40 °C to +85 °C operating range, meeting IEC 61000-6-2 immunity requirements. |
Use Scenario: Protecting RS-485 transceiver inputs against transient surges in building control networks. IC Role / Device Role / Timing Role: Low-capacitance (1.5 pF) shunt clamp limiting line voltage to 39 V during EFT bursts. Use Value: Minimal capacitance avoids signal edge degradation at 10 Mbps data rates while maintaining compliance with IEC 61000-4-4 Level 4. |
| Avionics Power Monitor | Medical Isolated DC-DC Feedback |
|
Use Scenario: Monitoring 28 V aircraft bus voltage via resistive divider into microcontroller ADC. IC Role / Device Role / Timing Role: Precision Zener reference (39 V, ±5%) scaling bus voltage to safe ADC input range with known ratio. Use Value: Hermetic DO-213AA package withstands extended thermal cycling and humidity exposure per DO-160 Section 16. |
Use Scenario: Providing isolated feedback voltage to secondary-side controller in Class III medical AC/DC converter. IC Role / Device Role / Timing Role: Primary-side Zener reference generating stable 39 V for optocoupler LED drive in flyback feedback loop. Use Value: Low noise density (1 µV/√Hz) prevents coupling of switching noise into isolation barrier, supporting IEC 60601-1 creepage/clearance compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C39LT1G | 39 V, ±5%, SOT-23 package, 300 mW rating, 600 Ω ZZT, 100 nA IR at 31.2 V | Lower power rating and higher impedance limit use in low-current, non-critical references only | Select when board space is constrained and thermal budget allows lower dissipation |
| MMBZ5242B | 39 V, ±5%, SOT-23, 350 mW, 70 Ω ZZT at 10 mA, 100 nA IR at 31.2 V | Optimized for 10 mA test current - less stable at 250 mA; not rated for >125 °C ambient | Prefer for cost-sensitive consumer designs where extended temperature range is unnecessary |
Compared with BZX84-C39LT1G and MMBZ5242B, the 1N4123UR/TR delivers superior thermal robustness (–65 °C to +175 °C), lower noise, and tighter regulation at high test current - making it uniquely suitable for aerospace, downhole, and high-reliability industrial systems where hermeticity and long-term stability are mandatory.
Availability
1N4123UR/TR is available at Aetrix Electronics and suitable for industrial sensor reference, avionics power monitoring, and medical isolated DC-DC feedback applications requiring stable component supply, traceable sourcing, and long-lifecycle availability.
Supply support for 1N4123UR/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-temperature analog components for defense, aerospace, and industrial markets.
The 1N4123UR/TR belongs to Microsemi's legacy DO-213AA glass Zener family, engineered for extreme-environment voltage regulation where hermetic sealing, wide temperature operation, and low-noise performance are non-negotiable.
FAQ
What is the Zener voltage tolerance for 1N4123UR/TR?
The 1N4123UR/TR has a nominal Zener voltage of 39 V with a standard tolerance of ±5%, as defined by JEDEC registration and confirmed in Microsemi's datasheet revision D. No suffix indicates this standard tolerance; tighter tolerances (±2% or ±1%) require C or D suffixes not present in this part number. The 1N4123UR/TR maintains this specification across its full operating temperature range when used within rated power limits.
Does 1N4123UR/TR have a cathode band marking?
Yes, the 1N4123UR/TR features a single black cathode band on the glass body, identifying the cathode terminal. Per datasheet polarity definition, the banded end must be held at a higher potential than the unbanded (anode) end during Zener regulation. This marking is consistent across all DO-213AA-packaged devices in the 1N4099UR–1N4135UR series, including the 1N4123UR/TR.
What is the maximum steady-state power dissipation for 1N4123UR/TR?
The 1N4123UR/TR is rated for 0.5 W steady-state power dissipation when mounted on FR4 PCB with 1 oz copper and operated at end-cap temperature below 100 °C or ambient temperature below 25 °C. Derating follows the curve in Figure 2 of the datasheet: power decreases linearly to zero at 175 °C ambient or 200 °C end-cap temperature. This rating applies specifically to the 1N4123UR/TR in its DO-213AA package configuration.
Is 1N4123UR/TR RoHS compliant?
Yes, the "e3" suffix in 1N4123UR/TR denotes RoHS compliance, indicating annealed matte-tin plating per MIL-STD-750 Method 2026. This replaces traditional tin-lead finish while maintaining solderability at 260 °C for 10 seconds. The RoHS-compliant version retains identical electrical and thermal specifications as non-RoHS variants, ensuring drop-in compatibility for the 1N4123UR/TR in environmentally regulated designs.
What is the thermal resistance junction-to-ambient for 1N4123UR/TR?
The thermal resistance junction-to-ambient for 1N4123UR/TR is 300 °C/W when mounted on FR4 PCB with 1 oz copper and using the recommended footprint (A = 5.08 mm, B = 1.40 mm, C = 2.03 mm). This value assumes natural convection cooling and is specified in the "Maximum Ratings" section of the datasheet. Junction-to-end-cap thermal resistance is 150 °C/W - a more relevant metric for heatsink-integrated mounting of the 1N4123UR/TR.
1N4123UR/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):
- 39 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 200 Ohms
- Current - Reverse Leakage @ Vr:
- 10 nA @ 29.65 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.1 V @ 200 mA
- Operating Temperature:
- -65°C ~ 175°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-213AA
1N4123UR/TR FAQ
1.How can I place an order for 1N4123UR/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4123UR/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 1N4123UR/TR reliable?
The price and inventory of 1N4123UR/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4123UR/TR is usually 5 days.
3.What payment methods are accepted for 1N4123UR/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4123UR/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4123UR/TR?
1N4123UR/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4123UR/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 1N4123UR/TR?
For technical support, including 1N4123UR/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4123UR/TR requirements.
6.How does Aetrix verify that 1N4123UR/TR is sourced from the original manufacturer or authorized distributors?
All 1N4123UR/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 1N4123UR/TR meets industry standards.
7.What is the process for return or replacement of 1N4123UR/TR?
All 1N4123UR/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N4123UR/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 1N4123UR/TR part is unused and in its original packaging.
Return procedure for 1N4123UR/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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