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Microchip Technology 1N4112-1
- Part No.:
- 1N4112-1
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N4112-1.pdf
- Description:
- DIODE ZENER 18V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:2,907
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Product details
Overview
1N4112-1 from Microsemi is a 500 mW, 18.0 V ±5% metallurgically bonded glass Zener diode in DO-35 (DO-204AH) package, qualified to JANTXV level per MIL-PRF-19500/435. It delivers stable voltage regulation at 250 mA test current with 100 Ω dynamic impedance, low noise density (1 µV/√Hz), and operates across –65 °C to +175 °C for aerospace power supply reference applications.
For engineers reviewing the 1N4112-1 datasheet, 1N4112-1 pinout, 1N4112-1 application, or 1N4112-1 equivalent, key selection criteria include Zener voltage tolerance, junction temperature range, thermal resistance (250 °C/W junction-to-lead), noise performance at 18 V, and military qualification level - all critical for high-reliability analog reference and voltage clamp designs.
Technical Context
The 1N4112-1 functions as a precision shunt voltage regulator operating in reverse breakdown, with cathode-banded polarity indicating the regulated terminal. Its metallurgical bond construction ensures mechanical stability under thermal cycling and radiation exposure, supporting operation up to JANTXV reliability grade.
It exhibits a +0.090 %/°C temperature coefficient and maintains ≤0.05 µA reverse leakage at 14.4 V, enabling stable reference generation in unregulated DC rails. Dynamic impedance is specified at 100 Ω measured with 25 µA rms AC superimposed on 250 mA DC bias per MicroNote 202.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 18.0 V ±5% at 250 mA - defines precise regulation point for feedback loops and reference circuits |
| Power Dissipation | 500 mW @ 25 °C - supports continuous regulation in compact axial-leaded layouts with linear derating to zero at 175 °C |
| Dynamic Impedance ZZT | 100 Ω @ 250 mA - ensures minimal output voltage shift under load transients in precision references |
| Noise Density | 1 µV/√Hz @ 18 V - enables low-noise voltage references in sensitive analog signal chains |
| Reverse Leakage IR | ≤0.05 µA @ 14.4 V - guarantees tight regulation margin below knee voltage in low-power standby modes |
| Temp Coefficient αVZ | +0.090 %/°C - allows predictable drift compensation in wide-temperature industrial systems |
| Junction Temp Range | –65 °C to +175 °C - validated for extended operation in avionics, downhole, and space-qualified electronics |
Pinout & Package
DO-35 (DO-204AH) hermetically sealed axial-leaded glass package with tin-lead or RoHS-compliant matte-tin plating; cathode indicated by single black band; weight ≈ 0.2 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unbanded end) | Reference ground node | Connected to system ground or common return; establishes reference potential for regulation |
| Cathode (banded end) | Regulated output node | Provides stable 18.0 V output when reverse-biased; must be held positive relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| Metallurgical bond construction | Eliminates interfacial delamination risk during thermal cycling, ensuring long-term parameter stability in harsh environments |
| JANTXV qualification per MIL-PRF-19500/435 | Validated screening for burn-in, temperature cycling, and hermeticity - required for flight-critical subsystems |
| Low capacitance (typ. <2 pF) | Minimizes high-frequency coupling into reference nodes, preserving signal integrity in RF-adjacent circuits |
| Radiation hardness | Inherently tolerant to total ionizing dose (TID) per Microsemi MicroNote 050 - suitable for space-grade applications |
| ESD immunity | Non-sensitive per MIL-STD-750 Method 1020 - eliminates need for external protection in handling and assembly |
Applications
| Avionics Power Reference | Satellite Bus Voltage Clamp |
|---|---|
Use Scenario: Regulating 18 V reference in triple-redundant DC-DC converter feedback networks of UAV flight controllers. IC Role / Device Role / Timing Role: Shunt voltage reference providing error-signal baseline for PWM controller ICs. Use Value: JANTXV qualification and –65 °C to +175 °C operation ensure uninterrupted regulation during rapid altitude-induced thermal excursions. | Use Scenario: Clamping bus overvoltage transients on 18 V power distribution boards in LEO satellite payloads. IC Role / Device Role / Timing Role: Transient voltage suppressor protecting downstream FPGAs and ADCs from rail collapse events. Use Value: 100 Ω ZZT and 1 µV/√Hz noise enable fast clamping without injecting ripple into precision telemetry circuits. |
| Downhole Sensor Excitation | Nuclear Instrumentation Reference |
Use Scenario: Supplying stable 18 V excitation to piezoresistive pressure transducers in oil/gas well logging tools. IC Role / Device Role / Timing Role: Precision voltage source for ratiometric sensor bridge biasing. Use Value: Radiation hardness and +0.090 %/°C αVZ allow accurate pressure measurement across 175 °C downhole thermal gradients. | Use Scenario: Establishing calibrated reference in gamma spectroscopy front-end amplifiers requiring ultra-low-noise bias. IC Role / Device Role / Timing Role: Low-noise Zener element in discrete op-amp reference stages. Use Value: 1 µV/√Hz noise density directly limits system noise floor, enabling sub-keV energy resolution in scintillation detectors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4744A | 20 V nominal, ±5%, 1 W rating, DO-41 package, no military qualification | Higher power but lacks JANTXV screening and radiation hardness | Select for commercial industrial supplies where cost and power > reliability |
| SMF18A | 18 V, ±5%, 400 W peak pulse, SOD-123FL package, TVS-rated not Zener-regulated | Designed for transient suppression, not precision DC regulation | Select only for overvoltage clamping - not for reference or bias applications |
Compared with 1N4112-1, 1N4744A offers higher power but no military screening or radiation tolerance; SMF18A provides surge protection but cannot maintain stable 18 V DC regulation under steady-state conditions - making 1N4112-1 irreplaceable for high-reliability reference use cases.
Availability
1N4112-1 is available at Aetrix Electronics and suitable for avionics power reference, satellite bus voltage clamp, and downhole sensor excitation requiring stable component supply across extended temperature and radiation environments.
Supply support for 1N4112-1 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 belongs to Microsemi's legacy MIL-PRF-19500/435-qualified Zener diode family, engineered specifically for precision voltage reference and regulation in mission-critical systems exposed to extreme thermal, radiation, and mechanical stress.
FAQ
What is the Zener voltage tolerance for the 1N4112-1?
The 1N4112-1 has a nominal Zener voltage of 18.0 V with a standard tolerance of ±5%, as defined in the JEDEC-registered electrical characteristics table. This tolerance applies at 250 mA test current and 25 °C ambient temperature, and is confirmed in the "PART NOMENCLATURE" section where blank suffix indicates 5% tolerance.
Is the 1N4112-1 suitable for surface-mount designs?
No - the 1N4112-1 is packaged exclusively in the axial-leaded DO-35 (DO-204AH) glass case. Surface-mount variants exist in the same family (e.g., 1N4112UR-1 in DO-213AA), but the 1N4112-1 itself requires through-hole mounting with 3/8″ lead length for proper thermal management per RθJL = 250 °C/W specification.
What is the maximum reverse leakage current for the 1N4112-1?
The maximum reverse leakage current (IR) for the 1N4112-1 is 0.05 µA at 14.4 V (80% of VZ), as specified in the Electrical Characteristics table on page 3 of T4-LDS-0245-2. This value is measured at 25 °C and confirms tight regulation control near the knee region.
Does the 1N4112-1 have radiation hardness certification?
Yes - the 1N4112-1 is inherently radiation hard per Microsemi MicroNote 050, a documented characteristic of its metallurgically bonded construction and glass encapsulation. While not individually tested per MIL-STD-883, this property is design-validated across the 1N4099–1N4135 family for TID resilience in space applications.
What is the thermal resistance junction-to-lead for the 1N4112-1?
The thermal resistance junction-to-lead (RθJL) for the 1N4112-1 is 250 °C/W when mounted with 3/8″ (10 mm) lead length from body, as stated in the Maximum Ratings table. This value enables accurate power derating calculations for PCB layout and heatsinking in high-temperature environments.
1N4112-1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Bulk
- 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 FAQ
1.How can I place an order for 1N4112-1 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4112-1 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 reliable?
The price and inventory of 1N4112-1 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 is usually 5 days.
3.What payment methods are accepted for 1N4112-1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4112-1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4112-1?
1N4112-1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4112-1 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?
For technical support, including 1N4112-1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4112-1 requirements.
6.How does Aetrix verify that 1N4112-1 is sourced from the original manufacturer or authorized distributors?
All 1N4112-1 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 meets industry standards.
7.What is the process for return or replacement of 1N4112-1?
All 1N4112-1 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4112-1, 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 part is unused and in its original packaging.
Return procedure for 1N4112-1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4112-1 Tags
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