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Microchip Technology 1N4112-1/TR
- Part No.:
- 1N4112-1/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N4112-1/TR.pdf
- Description:
- DIODE ZENER 18V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:9,944
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Product details
Overview
1N4112-1/TR from Microsemi is a 500 mW, 18.0 V Zener diode in DO-35 glass package, qualified to JANTXV level per MIL-PRF-19500/435, with 100 Ω dynamic impedance at 250 mA test current and ±5% voltage tolerance. It delivers stable voltage regulation in high-reliability power supply reference and overvoltage protection circuits across military and aerospace systems.
For engineers reviewing the 1N4112-1/TR datasheet, 1N4112-1/TR pinout, 1N4112-1/TR application, or 1N4112-1/TR equivalent, key selection criteria include its 18.0 V nominal Zener voltage, 100 Ω Zener impedance at IZT, 0.05 µA maximum reverse leakage at 14.4 V, -65 °C to +175 °C operating temperature range, and hermetically sealed axial-leaded DO-35 construction.
Technical Context
This device operates as a precision voltage reference by maintaining a stable 18.0 V across its terminals under reverse bias, with regulation validated at 250 mA test current (IZT) and characterized by low noise density (≤1 µV/√Hz below 6.8 V) and a +0.090 %/°C temperature coefficient. Its metallurgically bonded junction ensures long-term stability under thermal cycling.
The 1N4112-1/TR is rated for 500 mW average power dissipation at 25 °C, linearly derated to zero at 175 °C, and exhibits 0.2 g mass, 250 °C/W junction-to-lead thermal resistance, and cathode band polarity marking per JEDEC DO-35 mechanical standard.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 18.0 V at 250 mA - defines regulated output voltage under standard test conditions |
| Zener Impedance | 100 Ω at IZT = 250 mA - determines voltage deviation under load current changes |
| Max Reverse Leakage | 0.05 µA at 14.4 V - ensures minimal standby power loss in high-impedance bias networks |
| Power Dissipation | 500 mW at 25 °C - sets maximum continuous thermal load on PCB layout |
| Operating Temperature | -65 °C to +175 °C - supports deployment in extreme environmental conditions without derating |
| Package | DO-35 (DO-204AH) - axial-leaded, hermetically sealed glass package with 0.2 g mass and cathode band marking |
| Qualification Level | JANTXV per MIL-PRF-19500/435 - certifies reliability for military-grade applications requiring screening and traceability |
Pinout & Package
DO-35 (DO-204AH) axial-leaded glass package: hermetically sealed, tin-lead or RoHS-compliant matte-tin plating, cathode indicated by band, weight ≈0.2 g, lead length 25.4–38.1 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to circuit ground or lower-potential node during Zener operation |
| Cathode | Zener regulation terminal / voltage reference output | Banded end; connected to unregulated input to deliver stable 18.0 V to load |
Key Features
| Feature | Design Value |
|---|---|
| Metallurgical bond construction | Ensures long-term parameter stability and resistance to thermal fatigue in cyclic environments |
| Low noise density | ≤1 µV/√Hz at 18 V enables use in precision analog references without added filtering |
| MIL-PRF-19500/435 qualification | JANTXV screening provides guaranteed lot traceability, burn-in, and parametric testing for mission-critical systems |
| Hermetic glass sealing | Prevents moisture ingress and parameter drift over decades in harsh storage or operational conditions |
| ESD immunity | Non-sensitive per MIL-STD-750 Method 1020 - eliminates need for external ESD protection in handling |
Applications
| Avionics Power Reference | Satellite DC-DC Converter Feedback |
|---|---|
Use Scenario: Providing stable 18.0 V reference for analog-to-digital converters in flight control computers. IC Role / Device Role / Timing Role: Zener diode acting as primary voltage reference source for ADC biasing and sensor signal conditioning. Use Value: Maintains ±0.9 V regulation over -55 °C to +125 °C with <0.05 µA leakage, ensuring consistent ADC full-scale accuracy. | Use Scenario: Setting feedback threshold in isolated flyback converter regulating 18 V bus for payload subsystems. IC Role / Device Role / Timing Role: Precision shunt regulator defining output voltage via optocoupler feedback loop. Use Value: 100 Ω Zener impedance minimizes output voltage ripple under 250 mA load transients common in satellite power sequencing. |
| Radiation-Hardened Sensor Interface | Tactical Radio Bias Network |
Use Scenario: Supplying regulated bias to radiation-tolerant op-amps in nuclear detection instrumentation. IC Role / Device Role / Timing Role: Voltage clamp and reference generator in front-end analog signal chain exposed to ionizing radiation. Use Value: Inherent radiation hardness per MicroNote 050 eliminates need for shielding or redundancy in gamma-rich environments. | Use Scenario: Establishing stable 18 V rail for RF power amplifier biasing in handheld military radios. IC Role / Device Role / Timing Role: Shunt regulator stabilizing local supply against battery voltage sag and RF-induced transients. Use Value: 500 mW power rating and -65 °C to +175 °C range support operation in desert and arctic field conditions without thermal derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4112US-1 | Same electrical specs but in DO-213AA surface-mount package; no axial leads | Requires SMT reflow process; unsuitable for through-hole prototyping or high-vibration mechanical mounting | Select when board space is constrained and automated assembly is used |
| 1N4746A | 18 V, 1 W rating, DO-41 package, ±5% tolerance, 25 Ω ZZT; not MIL-qualified | Lacks JANTXV screening, higher power, lower impedance - suited for commercial power supplies, not avionics | Select for cost-sensitive industrial designs where military qualification is unnecessary |
Compared with 1N4112US-1 and 1N4746A, the 1N4112-1/TR uniquely combines MIL-qualified reliability, axial-leaded DO-35 form factor, and 18.0 V regulation in a 500 mW hermetic package-making it irreplaceable in legacy-maintained defense platforms requiring exact mechanical and qualification compliance.
Availability
1N4112-1/TR is available at Aetrix Electronics and suitable for avionics power reference, satellite DC-DC converter feedback, and radiation-hardened sensor interface applications requiring stable component supply across extended lifecycle programs.
Supply support for 1N4112-1/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 and mixed-signal components for aerospace, defense, and industrial markets.
The 1N4112-1/TR belongs to Microsemi's legacy MIL-PRF-19500/435-qualified Zener diode family, designed specifically for voltage reference and regulation in mission-critical systems where long-term stability and environmental resilience are mandatory.
FAQ
What is the Zener voltage tolerance for 1N4112-1/TR?
The 1N4112-1/TR has a nominal Zener voltage of 18.0 V with a standard ±5% tolerance, as defined by JEDEC registration and confirmed in the Electrical Characteristics table on page 3 of T4-LDS-0245-2. This tolerance applies at 25 °C with the diode in thermal equilibrium and is consistent across all reliability levels including JANTXV.
Is 1N4112-1/TR RoHS compliant?
Yes, the 1N4112-1/TR is RoHS compliant, indicated by the "e3" suffix in its full nomenclature (1N4112-1e3/TR). Per the datasheet, RoHS compliance is available on commercial-grade versions only; JANTXV-qualified units retain tin-lead plating unless otherwise specified at order time.
What is the maximum reverse leakage current for 1N4112-1/TR?
The maximum reverse leakage current for 1N4112-1/TR is 0.05 µA at 14.4 V (80% of nominal Zener voltage), as specified in the Electrical Characteristics table. This value is measured at 25 °C and reflects the device's ultra-low leakage performance critical for high-impedance reference networks.
Does 1N4112-1/TR require derating above 25 °C?
Yes, the 1N4112-1/TR must be linearly derated starting at 25 °C ambient temperature, decreasing from 500 mW to zero at 175 °C, per Figure 2 in the datasheet. Derating follows a slope of approximately 3.57 mW/°C, and thermal design must account for RθJA = 300 °C/W on FR4 board with 4 mm² copper pads.
What does the "TR" suffix mean in 1N4112-1/TR?
The "TR" suffix in 1N4112-1/TR indicates tape-and-reel packaging per EIA-296 standard, enabling automated pick-and-place assembly. As noted in the Mechanical and Packaging section, this option is standard for commercial and qualified versions, and quantity requirements should be confirmed with the factory prior to ordering.
1N4112-1/TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 18 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 100 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 13.7 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.1 V @ 200 mA
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AH (DO-35)
1N4112-1/TR FAQ
1.How can I place an order for 1N4112-1/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4112-1/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 1N4112-1/TR reliable?
The price and inventory of 1N4112-1/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4112-1/TR is usually 5 days.
3.What payment methods are accepted for 1N4112-1/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4112-1/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4112-1/TR?
1N4112-1/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4112-1/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 1N4112-1/TR?
For technical support, including 1N4112-1/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4112-1/TR requirements.
6.How does Aetrix verify that 1N4112-1/TR is sourced from the original manufacturer or authorized distributors?
All 1N4112-1/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 1N4112-1/TR meets industry standards.
7.What is the process for return or replacement of 1N4112-1/TR?
All 1N4112-1/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N4112-1/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 1N4112-1/TR part is unused and in its original packaging.
Return procedure for 1N4112-1/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4112-1/TR Tags
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