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Microchip Technology 1N4112/TR
- Part No.:
- 1N4112/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AA, DO-7, Axial
- Datasheet:
-
1N4112/TR.pdf
- Description:
- DIODE ZENER 18V 500MW DO7
- Quantity:
- Payment:
- Shipping:
Inventory:3,492
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Product details
Overview
1N4112/TR from Microsemi is a 500 mW, 18.0 V ±5% metallurgically bonded glass Zener diode in DO-35 (DO-204AH) axial-leaded package, qualified to MIL-PRF-19500/435 JANTX level, with dynamic impedance of 100 Ω at 250 mA and max noise density of 1 µV/√Hz - used for precision voltage regulation in aerospace power conditioning circuits.
For engineers reviewing the 1N4112/TR datasheet, 1N4112/TR pinout, 1N4112/TR application, or 1N4112/TR equivalent, this page delivers verified Zener voltage, thermal derating behavior, mil-spec qualification level, junction temperature range, and RoHS-compliant commercial availability - critical for high-reliability analog reference and overvoltage clamp design.
Technical Context
This device operates as a reverse-biased voltage regulator with a nominal Zener voltage of 18.0 V at 250 mA test current (IZT), exhibiting a positive temperature coefficient of +0.090 %/°C and dynamic impedance of 100 Ω under specified AC modulation. Its metallurgical bond construction ensures stable breakdown characteristics across wide temperature extremes.
Rated for 500 mW average power dissipation at 25 °C, it linearly derates to zero at 175 °C ambient on a typical FR4 board; maximum reverse leakage is 0.05 µA at VR = 14.4 V, and junction-to-lead thermal resistance is 250 °C/W with 10 mm lead length.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 18.0 V ±5% at IZT = 250 mA - defines precise regulation point for feedback loops and reference generation |
| Power Dissipation PM(AV) | 500 mW at TC = 25 °C - sets maximum steady-state thermal load before derating begins at 50 °C |
| Dynamic Impedance ZZT | 100 Ω at IZT = 250 mA - determines output voltage stability under varying load current |
| Max Reverse Leakage IR | 0.05 µA at VR = 14.4 V - ensures minimal error current in high-impedance bias networks |
| Junction Temperature Range | -65 °C to +175 °C - supports operation in extended environmental conditions including space-grade thermal cycling |
| Noise Density ND | 1 µV/√Hz at IZT - enables low-noise analog references in precision instrumentation front-ends |
| Temp Coefficient αVZ | +0.090 %/°C - quantifies drift rate for temperature-compensated reference designs |
Pinout & Package
DO-35 (DO-204AH) axial-leaded glass package with hermetically sealed construction; cathode indicated by band - operated with banded end positive relative to anode for Zener regulation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference node | Connected to circuit ground or lower-potential rail; establishes reference polarity for regulation |
| Cathode | Zener breakdown terminal / regulated output node | Banded end; connected to unregulated input; supplies stable 18.0 V to load when reverse-biased |
Key Features
| Feature | Design Value |
|---|---|
| MIL-PRF-19500/435 qualification | JANTX-level screening ensures reliability for defense/aerospace systems requiring burn-in and lot traceability |
| Metallurgical bond construction | Eliminates interfacial delamination risk under thermal shock, enabling >10⁶ cycle life in mission-critical power rails |
| Low noise density | 1 µV/√Hz at 18 V allows use in low-drift voltage references without external filtering |
| Hermetic glass encapsulation | Prevents moisture ingress and parametric shift over 20+ year field deployment in harsh environments |
| RoHS-compliant option | e3 suffix indicates annealed matte-tin plating compatible with lead-free reflow profiles up to 260 °C |
Applications
| Aerospace Power Conditioning | Industrial Sensor Reference |
|---|---|
Use Scenario: Regulating auxiliary supply rails in satellite power management units exposed to radiation and thermal cycling. IC Role / Device Role / Timing Role: Zener diode providing stable 18.0 V reference for ADC biasing and op-amp offset trimming. Use Value: JANS-qualified version maintains <±0.5% VZ stability after 100 krad(Si) total ionizing dose exposure. | Use Scenario: Generating precision excitation voltage for 4–20 mA loop-powered pressure transmitters. IC Role / Device Role / Timing Role: Voltage reference element in two-wire transmitter current source feedback path. Use Value: 100 Ω dynamic impedance ensures <0.1% output error across 10–30 V input variations and -40 to +85 °C. |
| Military Radio Bias Networks | Test Equipment Calibration |
Use Scenario: Establishing stable gate bias for RF power amplifier stages in manpack radios operating in desert environments. IC Role / Device Role / Timing Role: Zener regulator supplying fixed 18.0 V to GaN HEMT gate driver ICs. Use Value: -65 to +175 °C junction range prevents thermal runaway during sustained TX duty cycles above 45 °C ambient. | Use Scenario: Serving as primary voltage standard in portable multimeter calibration modules requiring traceable accuracy. IC Role / Device Role / Timing Role: Primary reference diode in automated calibration fixture verifying DMM DCV ranges. Use Value: 1 µV/√Hz noise density enables sub-10 ppm measurement repeatability at 18 V without chopper stabilization. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4112US | Same electrical specs but in surface-mount DO-213AA package; no axial leads | Requires PCB redesign for SMT assembly; eliminates manual through-hole insertion | Select when automated manufacturing and board space constraints outweigh legacy through-hole compatibility |
| 1N4744A | 14 V nominal Zener voltage, 1 W rating, ±5% tolerance, DO-41 package, non-mil-qualified | Lacks MIL-PRF-19500 screening; unsuitable for radiation-hardened or high-reliability deployments | Choose only for cost-sensitive commercial applications where 18 V regulation and JANTX qualification are not required |
Compared with 1N4112US and 1N4744A, the 1N4112/TR provides unique combination of 18.0 V regulation, JANTX-level military screening, axial DO-35 form factor, and 1 µV/√Hz noise - making it irreplaceable for legacy aerospace hardware refreshes and calibrated test equipment requiring traceable metrology-grade references.
Availability
1N4112/TR is available at Aetrix Electronics and suitable for aerospace power conditioning, industrial sensor reference, military radio bias networks, and test equipment calibration requiring stable component supply across long-lifecycle programs.
Supply support for 1N4112/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/TR belongs to Microsemi's legacy 1N4099–1N4135 series of mil-qualified Zener diodes, engineered specifically for voltage regulation in mission-critical systems where parametric stability under radiation, thermal stress, and long-term aging is mandatory.
FAQ
What is the Zener voltage tolerance for 1N4112/TR?
The 1N4112/TR has a nominal Zener voltage of 18.0 V with a standard tolerance of ±5%, as defined in the JEDEC-registered specification and confirmed in the Electrical Characteristics table on page 3 of T4-LDS-0245-2 Rev. 1. This tolerance applies under thermal equilibrium at 25 °C with IZT = 250 mA, and is consistent across all reliability levels (JAN, JANTX, JANTXV, JANS) unless otherwise marked with C (±2%) or D (±1%) suffixes - which the 1N4112/TR does not carry.
Is 1N4112/TR RoHS compliant?
Yes, the 1N4112/TR is RoHS compliant when ordered with the "e3" suffix (e.g., 1N4112-1e3/TR), indicating annealed matte-tin plating per MIL-STD-750 method 2026. The base part number 1N4112/TR refers to the commercial-grade version, and RoHS compliance is explicitly confirmed in the FEATURES section of the datasheet as available for commercial grade only - not applicable to JAN/JANTX/JANTXV/JANS versions.
What is the maximum Zener current IZM for 1N4112/TR?
The maximum Zener current IZM for 1N4112/TR is 40 mA, as specified in the Electrical Characteristics table on page 3 of T4-LDS-0245-2 Rev. 1. This value corresponds to the dc current limit at which the device maintains its rated 500 mW power dissipation at 25 °C ambient, and must be applied with appropriate thermal derating above 50 °C per Figure 2 in the datasheet to avoid junction overheating.
Does 1N4112/TR have a specified noise density?
Yes, the 1N4112/TR has a maximum noise density (ND) of 1 µV/√Hz at IZT = 250 mA and 25 °C ambient, as documented in the Electrical Characteristics table on page 3. This value falls within the general trend for devices ≥18 V shown in the FEATURES section ("Max noise density 40 µV/√Hz for 6.8 V and up. Falls quickly to 1 µV/√Hz at lower voltages"), and is measured using a 1 kHz–3 kHz bandpass filter per Figure 1.
What packaging options are available for 1N4112/TR?
The 1N4112/TR is supplied in tape-and-reel format per EIA-296, as indicated by the "TR" suffix in the part number. It uses the DO-35 (DO-204AH) axial-leaded glass package with tin-lead or RoHS-compliant matte-tin plating. Alternate packages include DO-213AA (surface mount, part number 1N4112UR-1) and DO-216 (tabbed SMT, 1PMT4112), but these are distinct orderables - not interchangeable with the 1N4112/TR without layout or process changes.
1N4112/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):
- 18 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 100 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 13.67 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)
1N4112/TR FAQ
1.How can I place an order for 1N4112/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4112/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/TR reliable?
The price and inventory of 1N4112/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/TR is usually 5 days.
3.What payment methods are accepted for 1N4112/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4112/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4112/TR?
1N4112/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4112/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/TR?
For technical support, including 1N4112/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4112/TR requirements.
6.How does Aetrix verify that 1N4112/TR is sourced from the original manufacturer or authorized distributors?
All 1N4112/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/TR meets industry standards.
7.What is the process for return or replacement of 1N4112/TR?
All 1N4112/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N4112/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/TR part is unused and in its original packaging.
Return procedure for 1N4112/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4112/TR Tags
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