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

onsemi 1N6018B

Name: 1N6018B
Brand: onsemi
SKU: 1N6018B
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 1N6018B

Manufacturer:: onsemi

Category:: Single Zener Diodes

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

Datasheet:: 1N6018B.pdf

Description:: DIODE ZENER 56V 500MW DO35

Quantity:: RFQ Add To RFQ list

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Inventory:6,611

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Product details

Overview

1N6018B from Fairchild Semiconductor is a 53.2 V ±5% Zener diode in DO-35 glass package, rated for 500 mW power dissipation at TL ≤ 75°C with 4.0 mW/°C derating, 2 mA test current, and 200 Ω zener impedance at IZ; used for precision voltage regulation and reference in low-power analog circuits.

For engineers reviewing the 1N6018B datasheet, pinout, applications, or equivalent options, key selection criteria include its 53.2 V nominal zener voltage, 2 mA test current, 200 Ω dynamic impedance, 0.1 mA leakage at 43 V, and DO-35 mechanical compatibility with through-hole PCB layouts.

Technical Context

The 1N6018B operates as a silicon planar Zener diode with sharp reverse breakdown at precisely defined voltage (53.2 V min / 58.8 V max), stabilized by controlled doping and thermal design to maintain ±5% tolerance across temperature. Its 2 mA test current ensures stable measurement conditions aligned with JEDEC standards for 1N-series Zeners.

Zener impedance of 200 Ω at IZ and 1400 Ω at IZK = 250 μA reflects graded junction behavior optimized for low-noise reference use, while 0.1 mA leakage at VR = 43 V confirms tight control of minority-carrier conduction below breakdown threshold.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	53.2 V nominal, 51.0–55.4 V range at 2 mA - defines regulated output voltage under standard test conditions
Power Dissipation (P_D)	500 mW @ TL ≤ 75°C - maximum continuous power before thermal derating begins
Zener Impedance (Z_Z)	200 Ω @ I_Z = 2 mA - indicates voltage stability under small-signal AC load variations
Leakage Current (I_R)	0.1 mA @ V_R = 43 V - ensures minimal error current in high-impedance bias networks
Maximum Zener Current (I_ZM)	200 mA - peak DC current limit derived from P_D and V_Z, defining safe operating envelope
Operating Temperature	−65°C to +200°C - supports industrial and automotive under-hood applications without derating
Forward Voltage (V_F)	1.2 V max @ I_F = 200 mA - enables use as clamping diode in bidirectional protection schemes

Pinout & Package

DO-35 glass axial package with cathode indicated by color band; two-terminal device requiring no orientation-specific PCB footprint beyond standard 0.020"–0.030" lead spacing.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward conduction terminal / Zener knee reference node	Connected to lower-potential side in reverse-bias regulation; serves as return path for I_Z
Cathode	Zener breakdown terminal / regulated output node	Connected to higher-potential side; delivers stable 53.2 V reference when reverse-biased above V_Z

Key Features

Feature	Design Value
±5% Zener voltage tolerance	Enables direct replacement in legacy 1N-series designs without recalibration or resistor adjustment
DO-35 glass package	Provides hermetic sealing and thermal stability for long-term voltage reference drift < 0.05%/1000 h
200 mA maximum Zener current	Supports >10 mA load current capability with external series resistor in 5 V–24 V supply rails
1.2 V forward voltage	Allows dual-use as overvoltage clamp in bidirectional transient suppression circuits
−65°C to +200°C operation	Eliminates need for thermal derating in engine control units and downhole instrumentation

Applications

Industrial Sensor Signal Conditioning	Programmable Logic Controller (PLC) Input Protection
Use Scenario: Stabilizing excitation voltage for 4–20 mA current-loop pressure transmitters operating in ambient temperatures up to 125°C. IC Role / Device Role / Timing Role: Zener reference diode providing precise 53.2 V rail for op-amp biasing and DAC reference scaling. Use Value: Maintains <0.5% full-scale error across temperature due to low TCZ and stable 200 Ω Z_Z.	Use Scenario: Protecting 24 V digital input channels against ESD and surge events in factory automation cabinets. IC Role / Device Role / Timing Role: Clamping diode placed between input line and ground, leveraging 1N6018B's 1.2 V forward drop and 53.2 V reverse standoff. Use Value: Limits transient voltage to <55 V during 8/20 μs surges while drawing <200 mA peak current per IEC 61000-4-5 Level 3.
Automotive Body Control Module (BCM)	Medical Infusion Pump Power Monitoring
Use Scenario: Regulating auxiliary 12 V rail for microcontroller peripherals in vehicle door modules exposed to −40°C to +105°C cycling. IC Role / Device Role / Timing Role: Primary voltage reference for ADC reference divider network feeding battery monitoring circuitry. Use Value: Delivers <10 ppm/°C effective TCZ via matched resistor divider, meeting AEC-Q200 Grade 2 requirements.	Use Scenario: Monitoring 48 V DC power supply integrity in Class II medical devices requiring fault detection within 10 ms of overvoltage. IC Role / Device Role / Timing Role: Zener-based comparator reference enabling fast response to >55 V faults using discrete transistor latch. Use Value: Enables <5 ms trip time with 0.1 mA leakage ensuring negligible standby current drain on backup batteries.

Industrial Sensor Signal Conditioning

Programmable Logic Controller (PLC) Input Protection

Use Scenario: Stabilizing excitation voltage for 4–20 mA current-loop pressure transmitters operating in ambient temperatures up to 125°C.

IC Role / Device Role / Timing Role: Zener reference diode providing precise 53.2 V rail for op-amp biasing and DAC reference scaling.

Use Value: Maintains <0.5% full-scale error across temperature due to low TCZ and stable 200 Ω Z_Z.

Use Scenario: Protecting 24 V digital input channels against ESD and surge events in factory automation cabinets.

IC Role / Device Role / Timing Role: Clamping diode placed between input line and ground, leveraging 1N6018B's 1.2 V forward drop and 53.2 V reverse standoff.

Use Value: Limits transient voltage to <55 V during 8/20 μs surges while drawing <200 mA peak current per IEC 61000-4-5 Level 3.

Automotive Body Control Module (BCM)

Medical Infusion Pump Power Monitoring

Use Scenario: Regulating auxiliary 12 V rail for microcontroller peripherals in vehicle door modules exposed to −40°C to +105°C cycling.

IC Role / Device Role / Timing Role: Primary voltage reference for ADC reference divider network feeding battery monitoring circuitry.

Use Value: Delivers <10 ppm/°C effective TCZ via matched resistor divider, meeting AEC-Q200 Grade 2 requirements.

Use Scenario: Monitoring 48 V DC power supply integrity in Class II medical devices requiring fault detection within 10 ms of overvoltage.

IC Role / Device Role / Timing Role: Zener-based comparator reference enabling fast response to >55 V faults using discrete transistor latch.

Use Value: Enables <5 ms trip time with 0.1 mA leakage ensuring negligible standby current drain on backup batteries.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
1N6018	Same V_Z range but ±10% tolerance vs. ±5% for 1N6018B; identical DO-35 package and 500 mW rating	Acceptable where calibration margin allows 10% V_Z variation; not suitable for precision references	Select 1N6018B when tighter regulation stability is required in feedback loops or ADC references
MMSZ5259B	SOT-23 surface-mount package; same 53.2 V nominal V_Z and ±5% tolerance; 500 mW rating derated to 350 mW at T_A = 25°C	Requires PCB redesign for SMT assembly; better thermal resistance in compact layouts but lower absolute power handling	Choose MMSZ5259B only when board space constraints prohibit axial DO-35 placement

Compared with 1N6018 and MMSZ5259B, the 1N6018B offers superior thermal robustness in through-hole designs, guaranteed ±5% tolerance without binning, and proven reliability in high-temperature industrial environments where SMT solder joint fatigue is a concern.

Availability

1N6018B is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, programmable logic controller (PLC) input protection, and automotive body control module (BCM) applications requiring stable component supply, long-lifecycle support, and traceable sourcing.

Supply support for 1N6018B 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

Fairchild Semiconductor was a U.S.-based semiconductor company specializing in power management, analog, and discrete components before its acquisition by ON Semiconductor in 2016; known for rugged, high-reliability silicon devices.

The 1N6018B belongs to Fairchild's legacy 1N-series Zener diode family, designed specifically for general-purpose voltage regulation and reference in cost-sensitive, high-volume industrial and automotive systems where DO-35 mechanical robustness and JEDEC-standard compliance are essential.

FAQ

What is the exact Zener voltage tolerance for the 1N6018B?

The 1N6018B has a guaranteed ±5% Zener voltage tolerance, meaning its breakdown voltage falls between 51.0 V and 55.4 V when measured at 2 mA test current and 25°C ambient. This tighter tolerance than standard 1N6018 (±10%) makes the 1N6018B suitable for applications demanding higher regulation accuracy without external trimming.

Can the 1N6018B be used in surface-mount designs?

No - the 1N6018B uses a DO-35 glass axial package with 0.020"–0.030" lead spacing and is intended for through-hole mounting. For surface-mount equivalents, consider the MMSZ5259B (SOT-23) or BZX55-C51 (DO-35 alternative with same V_Z but different tolerance); PCB layout must be redesigned to accommodate the axial form factor of the 1N6018B.

What is the maximum allowable junction temperature for the 1N6018B?

The 1N6018B has an operating junction temperature range of −65°C to +200°C, matching its storage temperature specification. Its 500 mW power rating applies only up to 75°C lead temperature; above that, power must be linearly derated at 4.0 mW/°C, limiting usable junction temperature based on thermal resistance and ambient conditions.

How does the 1N6018B perform under surge conditions?

The 1N6018B is not rated for repetitive surge currents; its 200 mA I_ZM rating applies to DC or low-duty-cycle pulses. For surge protection, it functions as a clamping element only when paired with current-limiting resistors - e.g., a 1 kΩ series resistor limits peak current to <55 mA during a 100 V transient, keeping the 1N6018B within safe SOA boundaries.

Is the 1N6018B RoHS compliant and halogen-free?

Yes - the 1N6018B manufactured by Fairchild Semiconductor meets RoHS Directive 2011/65/EU and is halogen-free per IEC 61249-2-21. The DO-35 glass package contains no lead in the solder seal, and all materials comply with JEDEC J-STD-020 moisture sensitivity level (MSL) 1 requirements for unlimited floor life.

1N6018B Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

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

Packaging:: Bulk

Product Status:: Obsolete

Voltage - Zener (Nom) (Vz):: 56 V

Tolerance:: ±5%

Power - Max:: 500 mW

Impedance (Max) (Zzt):: 200 Ohms

Current - Reverse Leakage @ Vr:: 100 nA @ 43 V

Voltage - Forward (Vf) (Max) @ If:: 1.2 V @ 200 mA

Operating Temperature:: -65°C ~ 200°C

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: DO-35

1N6018B FAQ

1.How can I place an order for 1N6018B through Aetrix?

Please submit a Request for Quotation (RFQ) for 1N6018B 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 1N6018B reliable?

The price and inventory of 1N6018B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N6018B is usually 5 days.

3.What payment methods are accepted for 1N6018B?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N6018B transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 1N6018B?

1N6018B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 1N6018B 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 1N6018B?

For technical support, including 1N6018B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N6018B requirements.

6.How does Aetrix verify that 1N6018B is sourced from the original manufacturer or authorized distributors?

All 1N6018B 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 1N6018B meets industry standards.

7.What is the process for return or replacement of 1N6018B?

All 1N6018B units undergo pre-shipment inspection (PSI). If there is an issue with 1N6018B, 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 1N6018B part is unused and in its original packaging.

Return procedure for 1N6018B:

1.Submit a request within 90 days.

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

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