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Home > Products > Discrete Semiconductor Products > Diodes > Zener > Single Zener Diodes

Microchip Technology 1N4118-1

Name: 1N4118-1
Brand: Microchip Technology
SKU: 1N4118-1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 1N4118-1

Manufacturer:: Microchip Technology

Category:: Single Zener Diodes

Package:: DO-204AH, DO-35, Axial

Datasheet:: 1N4118-1.pdf

Description:: DIODE ZENER 27V 500MW DO204AH

Quantity:: RFQ Add To RFQ list

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Product details

Overview

1N4118-1 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. It delivers stable voltage regulation with 150 Ω dynamic impedance at 250 mA test current, 0.01 µA max reverse leakage at 20.5 V, and +0.090 %/°C temperature coefficient - used in precision reference and power supply feedback circuits for aerospace-grade instrumentation.

For engineers reviewing the 1N4118-1 datasheet, 1N4118-1 pinout, 1N4118-1 application, or 1N4118-1 equivalent, key selection criteria include Zener voltage tolerance, junction-to-lead thermal resistance (250 °C/W), noise density (≤1 µV/√Hz below 6.8 V), radiation hardness per MicroNote 050, and RoHS-compliant commercial variants (e3 suffix).

Technical Context

This device operates as a two-terminal voltage reference in reverse-bias breakdown mode, with cathode band marking polarity. Its metallurgical bond construction ensures mechanical stability under thermal cycling and shock, supporting operation across -65 °C to +175 °C junction temperature range.

The 1N4118-1 exhibits low capacitance (typical <2 pF at 0 V, per Figure 3), minimal ESD sensitivity (MIL-STD-750 Method 1020), and inherent radiation hardness - enabling use in high-reliability analog signal conditioning and voltage-clamp functions where parametric drift must remain bounded.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage V_Z	27.0 V at 250 mA - defines nominal regulation point for feedback loop setpoint accuracy
Zener Impedance Z_ZT	150 Ω - limits output voltage variation under load current changes in regulated supplies
Max Reverse Leakage I_R	0.01 µA @ 20.5 V - ensures negligible shunt current in high-impedance reference nodes
Power Dissipation P_M(AV)	0.5 W - supports continuous regulation up to 18.5 mA at 27 V without derating below 50 °C
Temp Coefficient α_VZ	+0.090 %/°C - predicts +24.3 mV/°C drift over full operating range, critical for temp-stable references
Noise Density ND	≤1 µV/√Hz - enables low-noise biasing in precision op-amp and ADC reference circuits
Junction Temp Range	-65 to +175 °C - validated for extended-temperature avionics and downhole electronics

Pinout & Package

DO-35 (DO-204AH) axial-leaded glass package: hermetically sealed, tin-lead or RoHS matte-tin plated leads, cathode indicated by single black 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	Forward conduction terminal / Zener cathode reference ground	Connected to circuit common; establishes reference potential for regulation
Cathode	Zener breakdown terminal / regulated output node	Banded end; supplies stable 27.0 V when reverse-biased above knee voltage

Key Features

Feature	Design Value
Metallurgical bond construction	Eliminates interfacial delamination risk during thermal cycling, ensuring long-term parameter stability in mission-critical systems
JANTXV qualification per MIL-PRF-19500/435	Validated reliability for aerospace flight hardware with screening including burn-in, thermal shock, and life testing
Low noise density ≤1 µV/√Hz	Enables direct use in ultra-low-noise analog front-ends without external filtering
Radiation hardness per MicroNote 050	Retains electrical parameters after total ionizing dose exposure >100 krad(Si), suitable for space-qualified designs
Non-ESD-sensitive per MIL-STD-750 Method 1020	Withstands handling without special grounding protocols, reducing assembly process overhead

Applications

Aerospace Power Monitoring	High-Voltage Reference Calibration
Use Scenario: Monitoring 28 V DC bus voltage in satellite power distribution units with telemetry reporting. IC Role / Device Role / Timing Role: Zener reference element in comparator input stage for overvoltage detection threshold. Use Value: Stable 27.0 V reference enables ±0.5% trip-point accuracy across -40 to +85 °C ambient, meeting ECSS-E-ST-20-07C requirements.	Use Scenario: Calibrating 30 V full-scale range of a 16-bit DAC in ground-test equipment. IC Role / Device Role / Timing Role: Precision voltage reference source for DAC output verification circuitry. Use Value: +0.090 %/°C tempco and ≤0.01 µA leakage ensure calibration drift <0.02% FS over 24-hour test cycles.
Avionics Sensor Biasing	Radiation-Hardened Signal Clamping
Use Scenario: Providing bias voltage to piezoresistive pressure transducers in flight control computers. IC Role / Device Role / Timing Role: Low-noise Zener regulator supplying excitation to bridge sensors. Use Value: ≤1 µV/√Hz noise density prevents degradation of 120 dB SNR sensor signals in analog signal chains.	Use Scenario: Protecting ADC inputs from transient overvoltage in nuclear reactor monitoring systems. IC Role / Device Role / Timing Role: Radiation-hardened clamp diode limiting input to 27.0 V ±5%. Use Value: Maintains clamping accuracy after 100 krad(Si) TID exposure, per MicroNote 050 validation data.

Aerospace Power Monitoring

High-Voltage Reference Calibration

Use Scenario: Monitoring 28 V DC bus voltage in satellite power distribution units with telemetry reporting.

IC Role / Device Role / Timing Role: Zener reference element in comparator input stage for overvoltage detection threshold.

Use Value: Stable 27.0 V reference enables ±0.5% trip-point accuracy across -40 to +85 °C ambient, meeting ECSS-E-ST-20-07C requirements.

Use Scenario: Calibrating 30 V full-scale range of a 16-bit DAC in ground-test equipment.

IC Role / Device Role / Timing Role: Precision voltage reference source for DAC output verification circuitry.

Use Value: +0.090 %/°C tempco and ≤0.01 µA leakage ensure calibration drift <0.02% FS over 24-hour test cycles.

Avionics Sensor Biasing

Radiation-Hardened Signal Clamping

Use Scenario: Providing bias voltage to piezoresistive pressure transducers in flight control computers.

IC Role / Device Role / Timing Role: Low-noise Zener regulator supplying excitation to bridge sensors.

Use Value: ≤1 µV/√Hz noise density prevents degradation of 120 dB SNR sensor signals in analog signal chains.

Use Scenario: Protecting ADC inputs from transient overvoltage in nuclear reactor monitoring systems.

IC Role / Device Role / Timing Role: Radiation-hardened clamp diode limiting input to 27.0 V ±5%.

Use Value: Maintains clamping accuracy after 100 krad(Si) TID exposure, per MicroNote 050 validation data.

Equivalent & Alternatives

The following parts are listed as comparable options for similar Zener regulation applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
1N4118UR-1	Same Zener voltage and tolerance, but in DO-213AA surface-mount package (no axial leads)	Required for automated SMT assembly; lacks axial mounting flexibility and lead-length thermal path	Select when board space is constrained and reflow compatibility is mandatory
1N4750A	27 V Zener, 5% tolerance, 1 W rating, DO-41 package; higher power but no military qualification	Not qualified to MIL-PRF-19500; unsuitable for aerospace or radiation environments	Select only for commercial industrial controls where cost and power margin outweigh reliability requirements

Compared with 1N4118UR-1 and 1N4750A, the 1N4118-1 uniquely combines JANTXV qualification, DO-35 axial form factor, and radiation hardness - making it irreplaceable in flight-critical voltage reference roles where traceability and environmental resilience are non-negotiable.

Availability

1N4118-1 is available at Aetrix Electronics and suitable for aerospace power monitoring, avionics sensor biasing, and radiation-hardened signal clamping requiring stable component supply across extended temperature and radiation environments.

Supply support for 1N4118-1 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, radiation-hardened, and aerospace-qualified components.

The 1N4118-1 belongs to Microsemi's legacy MIL-PRF-19500/435-qualified Zener diode family, designed specifically for precision voltage reference and regulation in defense, space, and nuclear applications where parameter stability under extreme stress is mandatory.

FAQ

What is the Zener voltage tolerance for 1N4118-1?

The 1N4118-1 has a nominal Zener voltage of 27.0 V with a standard tolerance of ±5%, as defined by JEDEC registration and confirmed in the Electrical Characteristics table on page 3 of T4-LDS-0245-2. This tolerance applies at 250 mA test current and 25 °C ambient temperature, and is maintained across the full qualified operating temperature range due to its metallurgical bond construction.

Is 1N4118-1 qualified for aerospace applications?

Yes, the 1N4118-1 is qualified to JANTXV level per MIL-PRF-19500/435, including screening for thermal shock, burn-in, and life testing. Its hermetically sealed DO-35 package, radiation hardness per MicroNote 050, and operation from -65 °C to +175 °C make it suitable for flight-critical voltage reference functions in satellites and aircraft systems.

What is the maximum reverse leakage current for 1N4118-1?

The maximum reverse leakage current (I_R) for 1N4118-1 is 0.01 µA at 20.5 V, as specified in the Electrical Characteristics table. This ultra-low leakage ensures minimal loading on high-impedance reference nodes and supports stable operation in precision analog circuits where current draw must be sub-picoampere.

Does 1N4118-1 have RoHS-compliant variants?

Yes, RoHS-compliant versions of 1N4118-1 are available with the "e3" suffix (e.g., 1N4118-1e3), featuring annealed matte-tin plating. These commercial-grade variants meet RoHS Directive 2011/65/EU but are not qualified to JAN/JANTX/JANTXV/JANS levels - military-grade units retain tin-lead plating per MIL-STD-750.

What is the thermal resistance from junction to lead for 1N4118-1?

The thermal resistance from junction to lead (R_θJL) for 1N4118-1 is 250 °C/W, measured with 10 mm (3/8 inch) lead length from the package body. This value enables accurate thermal modeling of power dissipation in chassis-mounted or heatsink-attached configurations, supporting reliable operation up to 500 mW at lead temperatures ≤50 °C.

1N4118-1 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):: 27 V

Tolerance:: ±5%

Power - Max:: 500 mW

Impedance (Max) (Zzt):: 150 Ohms

Current - Reverse Leakage @ Vr:: 10 nA @ 20.5 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)

1N4118-1 FAQ

1.How can I place an order for 1N4118-1 through Aetrix?

Please submit a Request for Quotation (RFQ) for 1N4118-1 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 1N4118-1 reliable?

The price and inventory of 1N4118-1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4118-1 is usually 5 days.

3.What payment methods are accepted for 1N4118-1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4118-1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 1N4118-1?

1N4118-1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 1N4118-1 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 1N4118-1?

For technical support, including 1N4118-1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4118-1 requirements.

6.How does Aetrix verify that 1N4118-1 is sourced from the original manufacturer or authorized distributors?

All 1N4118-1 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 1N4118-1 meets industry standards.

7.What is the process for return or replacement of 1N4118-1?

All 1N4118-1 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4118-1, 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 1N4118-1 part is unused and in its original packaging.

Return procedure for 1N4118-1:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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