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Microchip Technology 1N4123/TR
- Part No.:
- 1N4123/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AA, DO-7, Axial
- Datasheet:
-
1N4123/TR.pdf
- Description:
- DIODE ZENER 39V 500MW DO7
- Quantity:
- Payment:
- Shipping:
Inventory:9,012
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Product details
Overview
1N4123/TR from Microsemi is a 39 V, 500 mW axial-leaded glass Zener diode in DO-35 (DO-204AH) package, qualified to JANTXV level per MIL-PRF-19500/435, with 5% voltage tolerance, 200 Ω dynamic impedance at 250 mA, and max reverse current of 10 nA at 31.2 V. It delivers stable voltage regulation in high-reliability power supply reference circuits.
For engineers reviewing the 1N4123/TR datasheet, 1N4123/TR pinout, 1N4123/TR application, or 1N4123/TR equivalent, this page provides verified Zener voltage, thermal derating behavior, noise density, junction temperature range, and military qualification status - all critical for aerospace, defense, and industrial analog design.
Technical Context
This Zener diode operates in reverse breakdown with cathode-banded polarity, requiring the banded end to be held positive relative to the anode for regulation. Its metallurgically bonded construction ensures low noise (≤1 µV/√Hz below 6.8 V), minimal capacitance (~1.5 pF at 39 V), and radiation hardness per MicroNote 050.
Thermal performance is defined by RθJL = 250 °C/W (at 10 mm lead length) and linear derating from 500 mW at 25 °C to zero at 175 °C ambient. It exhibits +0.095 %/°C temperature coefficient and supports stable regulation across -65 °C to +175 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 39.0 V ±5% at 250 mA test current - sets precise reference point for feedback loops in regulated DC supplies. |
| Power Dissipation | 500 mW at 25 °C, derated linearly to zero at 175 °C - defines maximum continuous thermal load on PCB traces and layout copper area. |
| Dynamic Impedance ZZT | 200 Ω at 250 mA - determines output voltage stability under varying load current in shunt regulator topologies. |
| Reverse Leakage IR | 10 nA max at 31.2 V - ensures negligible error current in high-impedance reference nodes. |
| Junction Temp Range | -65 °C to +175 °C - enables operation in extended-environment avionics, downhole tools, and engine control units. |
| Noise Density | ≤1 µV/√Hz - critical for low-noise analog references in precision instrumentation and ADC biasing. |
| Temp Coefficient αVZ | +0.095 %/°C - quantifies drift magnitude over temperature, enabling accurate error budgeting in wide-temp designs. |
Pinout & Package
DO-35 (DO-204AH) hermetically sealed axial-glass package with tin-lead or RoHS-compliant matte-tin plating; cathode indicated by color band; weight ≈0.2 g; body diameter 1.42–2.29 mm, length 3.56–5.08 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unbanded end) | Current sink terminal in reverse bias | Connected to lower-potential node (e.g., ground or return rail) during Zener operation. |
| Cathode (banded end) | Regulated voltage output node | Provides stable 39 V reference when biased positively relative to anode; polarity must be observed to avoid forward conduction. |
Key Features
| Feature | Design Value |
|---|---|
| Metallurgical bond construction | Enables low-noise operation (<1 µV/√Hz) and radiation hardness per MicroNote 050 - essential for space-grade analog references. |
| MIL-PRF-19500/435 qualification | Qualified to JANTXV reliability level - guarantees screening, lot traceability, and failure rate data for mission-critical systems. |
| Hermetic glass sealing | Prevents moisture ingress and long-term parameter drift - maintains VZ stability over decades in harsh environments. |
| Low capacitance (~1.5 pF) | Minimizes high-frequency coupling and signal distortion in RF bias networks and fast-switching regulator feedback paths. |
Applications
| Aerospace Power Reference | Industrial Sensor Excitation |
|---|---|
Use Scenario: Providing stable 39 V reference for analog-to-digital converters in satellite telemetry modules operating across -55 °C to +125 °C. IC Role / Device Role / Timing Role: Shunt voltage reference establishing precision scaling for sensor signal conditioning front-ends. Use Value: JANTXV qualification and radiation hardness ensure uninterrupted operation in LEO orbit without calibration drift. | Use Scenario: Biasing 4–20 mA current-loop transmitters in oil & gas pressure sensors exposed to vibration and thermal cycling. IC Role / Device Role / Timing Role: Zener-regulated excitation source for bridge-based strain gauges and RTDs. Use Value: Hermetic DO-35 package prevents humidity-induced leakage that would corrupt low-level mV outputs. |
| Military Radio Voltage Clamp | Avionics Display Backlight Control |
Use Scenario: Overvoltage protection clamp in HF transceiver power rails subjected to ESD and lightning-induced surges. IC Role / Device Role / Timing Role: Fast-reacting shunt limiter clamping transient spikes above 39 V while maintaining steady-state regulation. Use Value: Low dynamic impedance (200 Ω) ensures rapid voltage stabilization during microsecond-scale transients. | Use Scenario: Setting constant-current drive level for LED backlight arrays in cockpit multifunction displays. IC Role / Device Role / Timing Role: Precision current-source reference in op-amp-controlled LED driver feedback loop. Use Value: Tight 5% VZ tolerance and low tempco (+0.095 %/°C) maintain consistent brightness across flight envelope temperatures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4749A | 39 V, 1 W, DO-41 package, ±5% tolerance, 250 Ω ZZT, commercial grade only | Lacks MIL qualification; higher power but larger footprint and no radiation hardness | Select for cost-sensitive industrial power supplies where military screening is unnecessary. |
| 1N5257B | 39 V, 500 mW, DO-35 package, ±5% tolerance, 300 Ω ZZT, commercial grade only | Same package but no MIL-PRF-19500 qualification; higher dynamic impedance degrades regulation accuracy | Choose only for non-critical prototyping where JANTXV traceability and low-noise performance are not required. |
Compared with 1N4123/TR, the 1N4749A offers higher power but sacrifices military reliability and low-noise operation, while the 1N5257B matches the DO-35 form factor but lacks qualification and exhibits poorer regulation stability due to higher ZZT.
Availability
1N4123/TR is available at Aetrix Electronics and suitable for aerospace power reference, industrial sensor excitation, and military radio voltage clamp applications requiring stable component supply, full traceability, and long-lifecycle support.
Supply support for 1N4123/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 defense, aerospace, and industrial markets.
The 1N4123/TR belongs to Microsemi's legacy MIL-qualified Zener diode family designed specifically for precision voltage reference and overvoltage protection in mission-critical systems where parameter stability and environmental resilience are mandatory.
FAQ
What is the Zener voltage tolerance and test current for the 1N4123/TR?
The 1N4123/TR has a nominal Zener voltage of 39.0 V with ±5% tolerance, measured at a Zener test current (IZT) of 250 mA. This tolerance reflects the standard JEDEC specification for the 1N4099–1N4135 series and applies under thermal equilibrium conditions at 25 °C ambient temperature.
Is the 1N4123/TR qualified to military standards?
Yes, the 1N4123/TR is qualified per MIL-PRF-19500/435 at the JANTXV reliability level. This includes rigorous screening for temperature cycling, burn-in, and parameter verification, ensuring suitability for high-reliability aerospace and defense applications where failure is not an option.
What is the maximum reverse leakage current for the 1N4123/TR?
The 1N4123/TR specifies a maximum reverse leakage current (IR) of 10 nA at a reverse voltage (VR) of 31.2 V. This ultra-low leakage supports high-impedance reference node integrity in precision analog circuits such as sensor signal chains and ADC voltage references.
Does the 1N4123/TR have radiation hardness certification?
Yes, the 1N4123/TR exhibits inherent radiation hardness as documented in Microsemi MicroNote 050. Its metallurgically bonded DO-35 construction provides resistance to total ionizing dose (TID) effects, making it suitable for use in space-qualified electronics without additional shielding.
What is the thermal derating behavior of the 1N4123/TR?
The 1N4123/TR dissipates 500 mW at 25 °C ambient, with linear derating to zero at 175 °C. Derating begins at 50 °C for lead temperature and at 25 °C for ambient on typical FR4 boards - requiring careful thermal layout with adequate copper pour and lead length management to sustain rated power.
1N4123/TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-204AA, DO-7, Axial
- 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:
- Through Hole
- Supplier Device Package:
- DO-7 (DO-204AA)
1N4123/TR FAQ
1.How can I place an order for 1N4123/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4123/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 1N4123/TR reliable?
The price and inventory of 1N4123/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4123/TR is usually 5 days.
3.What payment methods are accepted for 1N4123/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4123/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4123/TR?
1N4123/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4123/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 1N4123/TR?
For technical support, including 1N4123/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4123/TR requirements.
6.How does Aetrix verify that 1N4123/TR is sourced from the original manufacturer or authorized distributors?
All 1N4123/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 1N4123/TR meets industry standards.
7.What is the process for return or replacement of 1N4123/TR?
All 1N4123/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N4123/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 1N4123/TR part is unused and in its original packaging.
Return procedure for 1N4123/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4123/TR Tags
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