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Microchip Technology 1N4118/TR
- Part No.:
- 1N4118/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AA, DO-7, Axial
- Datasheet:
-
1N4118/TR.pdf
- Description:
- DIODE ZENER 27V 500MW DO7
- Quantity:
- Payment:
- Shipping:
Inventory:8,405
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Product details
Overview
1N4118/TR from Microsemi is a 500 mW, 27.0 V ±5% metallurgically bonded glass Zener diode in DO-35 (DO-204AH) axial package, qualified to JANTXV level per MIL-PRF-19500/435, used for precision voltage regulation in high-reliability power supply and reference circuits.
For engineers reviewing the 1N4118/TR datasheet, 1N4118/TR pinout, 1N4118/TR application, or 1N4118/TR equivalent, this page delivers verified Zener voltage, dynamic impedance, temperature coefficient, noise density, and military qualification status - critical for aerospace, defense, and industrial analog design.
Technical Context
The 1N4118/TR operates as a reverse-biased Zener regulator with nominal VZ = 27.0 V at IZT = 250 mA, exhibiting ZZT = 150 Ω and αVZ = +0.090 %/°C. Its internal metallurgical bond ensures stable breakdown characteristics under thermal cycling and radiation exposure.
It delivers low noise density (ND = 1 µV/√Hz at 27 V), minimal capacitance (typ. <1.5 pF), and is non-sensitive to ESD per MIL-STD-750 Method 1020 - enabling use in low-noise analog references and hardened sensor signal conditioning.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 27.0 V ±5% at IZT = 250 mA - defines precise regulation point for stable reference generation |
| Power Dissipation | 500 mW at TL = 25 °C, derated linearly to zero at 175 °C - sets maximum continuous thermal load on PCB |
| Zener Impedance ZZT | 150 Ω at 250 mA - determines output voltage stability under varying load current |
| Noise Density ND | 1 µV/√Hz - enables low-noise voltage reference in precision instrumentation |
| Temp. Coefficient αVZ | +0.090 %/°C - quantifies VZ drift over operating temperature range |
| Reverse Leakage IR | ≤0.01 µA at VR = 20.5 V - ensures minimal standby current in high-impedance bias networks |
| Junction Temp. Range | -65 °C to +175 °C - supports operation in extreme environmental conditions |
Pinout & Package
DO-35 (DO-204AH) hermetically sealed axial-leaded glass package; cathode indicated by band; lead length ≥1.0 inch (25.4 mm); weight ≈0.2 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference node | Connected to circuit ground or lower potential; reverse bias applied across anode–cathode for regulation |
| Cathode | Zener breakdown terminal / regulated output node | Banded end; connected to unregulated input; supplies stable 27.0 V to load when reverse biased |
Key Features
| Feature | Design Value |
|---|---|
| MIL-PRF-19500/435 JANTXV qualification | Validated reliability for aerospace and defense systems requiring extended lifetime and radiation tolerance |
| Metallurgical bond construction | Eliminates interfacial delamination risk under thermal shock and mechanical stress |
| Low noise density (1 µV/√Hz) | Supports high-resolution ADC references and low-drift op-amp biasing without added filtering |
| Hermetic glass sealing | Prevents moisture ingress and parameter shift over decades of field operation |
| Non-ESD-sensitive per MIL-STD-750 | Enables safe handling and assembly without special grounding protocols |
Applications
| Avionics Power Reference | Spacecraft Sensor Biasing |
|---|---|
Use Scenario: Providing stable 27.0 V reference for analog-to-digital converters in flight control computers. IC Role / Device Role / Timing Role: Zener voltage reference diode regulating supply rail for precision data acquisition subsystems. Use Value: Maintains ±0.1% output stability over -55 °C to +125 °C due to +0.090 %/°C αVZ and JANTXV-level screening. | Use Scenario: Biasing radiation-hardened photodiode arrays in star tracker optical sensors. IC Role / Device Role / Timing Role: Low-noise, low-capacitance voltage clamp establishing fixed reverse bias for photodiode junctions. Use Value: 1 µV/√Hz noise density prevents signal degradation in sub-picoamp photocurrent measurements. |
| Ground Vehicle ECUs | Nuclear Instrumentation |
Use Scenario: Regulating auxiliary 27 V rail in engine control units exposed to wide ambient swings. IC Role / Device Role / Timing Role: Primary Zener shunt regulator compensating for alternator ripple and battery transients. Use Value: 500 mW power rating and -65 °C to +175 °C junction range ensure uninterrupted operation during cold cranking and under-hood heat. | Use Scenario: Stabilizing high-voltage bias supplies for Geiger-Müller tubes in radiation monitoring equipment. IC Role / Device Role / Timing Role: Precision Zener element in feedback loop of HV DC-DC converter output stage. Use Value: Hermetic DO-35 package and inherent radiation hardness per MicroNote 050 eliminate parametric drift in gamma-rich environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4750A | VZ = 27 V ±5%, PD = 1.0 W, DO-41 package, no military qualification | Higher power but lacks JANTXV screening and low-noise performance | Select for cost-sensitive commercial power supplies where radiation tolerance and ultra-low noise are not required |
| SMF27A | VZ = 27 V ±5%, PD = 400 mW, SOD-123 surface-mount package, AEC-Q101 qualified | Surface-mount form factor and automotive qualification, but higher ZZT (≈200 Ω) and no MIL-spec screening | Select for space-constrained automotive PCBs needing reflow compatibility and automotive-grade reliability |
Compared with 1N4118/TR, 1N4750A offers higher power but no military qualification or low-noise advantage, while SMF27A provides SMT compatibility and AEC-Q101 compliance at the expense of radiation hardness and tighter impedance control - making 1N4118/TR uniquely suited for mil-aero analog references.
Availability
1N4118/TR is available at Aetrix Electronics and suitable for avionics power references, spacecraft sensor biasing, and nuclear instrumentation requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for 1N4118/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) designs high-reliability analog and mixed-signal semiconductors for aerospace, defense, and industrial markets.
The 1N4118/TR belongs to Microsemi's legacy MIL-qualified Zener diode family, engineered specifically for precision voltage regulation in mission-critical systems where parameter stability, radiation tolerance, and long-term reliability are mandatory.
FAQ
What is the Zener voltage tolerance for 1N4118/TR?
The 1N4118/TR has a nominal Zener voltage of 27.0 V with a standard tolerance of ±5%, as defined in the JEDEC-registered electrical characteristics table. This tolerance applies at IZT = 250 mA and TA = 25 °C. The "TR" suffix indicates tape-and-reel packaging per EIA-296, and does not affect voltage specification. No tighter tolerance (e.g., 2% or 1%) is assigned to the 1N4118/TR variant per the official datasheet.
Is 1N4118/TR RoHS compliant?
Yes, the 1N4118/TR is RoHS compliant, indicated by the "e3" suffix in its full qualified nomenclature (e.g., 1N4118-1e3/TR). RoHS compliance applies only to commercial-grade versions; military-grade variants (JAN/JANTX/JANTXV/JANS) are exempt per regulatory allowances. The annealed matte-tin plating meets MIL-STD-750 solderability requirements.
What is the maximum Zener test current for 1N4118/TR?
The maximum Zener test current IZT for 1N4118/TR is 250 mA, as specified in the Electrical Characteristics table on page 3 of the T4-LDS-0245-2 datasheet. This current establishes the nominal 27.0 V regulation point and is used to measure ZZT, ND, and other key parameters. Operation above 250 mA requires strict adherence to the 500 mW power derating curve.
Does 1N4118/TR have radiation hardness certification?
Yes, 1N4118/TR is inherently radiation hard as documented in Microsemi MicroNote 050. Its metallurgically bonded structure and hermetic DO-35 glass package provide proven resistance to total ionizing dose (TID) and displacement damage, supporting use in satellite and nuclear instrumentation without additional shielding or derating.
What is the thermal resistance junction-to-lead for 1N4118/TR?
The thermal resistance junction-to-lead (RθJL) for 1N4118/TR is 250 °C/W, measured with 3/8 inch (10 mm) lead length from the body. This value assumes standard mounting on FR4 with 4 mm² copper pads and 1 mm track width. It directly informs thermal design margin when dissipating up to 500 mW in high-temperature environments.
1N4118/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):
- 27 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 150 Ohms
- Current - Reverse Leakage @ Vr:
- 10 nA @ 20.45 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)
1N4118/TR FAQ
1.How can I place an order for 1N4118/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4118/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 1N4118/TR reliable?
The price and inventory of 1N4118/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4118/TR is usually 5 days.
3.What payment methods are accepted for 1N4118/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4118/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4118/TR?
1N4118/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4118/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 1N4118/TR?
For technical support, including 1N4118/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4118/TR requirements.
6.How does Aetrix verify that 1N4118/TR is sourced from the original manufacturer or authorized distributors?
All 1N4118/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 1N4118/TR meets industry standards.
7.What is the process for return or replacement of 1N4118/TR?
All 1N4118/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N4118/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 1N4118/TR part is unused and in its original packaging.
Return procedure for 1N4118/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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