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

onsemi 1N5995B_T50A

Name: 1N5995B_T50A
Brand: onsemi
SKU: 1N5995B_T50A
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 1N5995B_T50A

Manufacturer:: onsemi

Category:: Single Zener Diodes

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

Datasheet:: 1N5995B_T50A.pdf

Description:: DIODE ZENER 6.2V 500MW DO35

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Product details

Overview

1N5995B_T50A from Fairchild Semiconductor is a 5.89–6.51 V, ±5% tolerance, 500 mW glass-passivated Zener diode in DO-35 package, designed for precision voltage regulation and reference in low-power analog circuits, power supply feedback loops, and overvoltage protection clamping at 5.2 V reverse test voltage.

For engineers reviewing the 1N5995B_T50A datasheet, pinout, applications, or equivalent options, this page delivers verified Zener voltage range, thermal derating behavior, leakage current at 4 V, dynamic impedance at 5 mA, and cathode identification per DO-35 marking convention - all critical for stable biasing and clamp design.

Technical Context

This Zener diode operates with a nominal zener voltage of 6.2 V at 5 mA test current, exhibiting 10 Ω dynamic impedance (ZZ) under regulated conditions and 1300 Ω knee impedance (ZZK) at 250 µA, enabling predictable turn-on in low-current reference paths. Its 500 mW power rating is valid only when lead temperature (TL) is held ≤75°C with 3/8″ lead length.

Thermal derating begins at 4.0 mW/°C above 75°C, and the device supports operation from –65°C to +200°C. Reverse leakage remains ≤1 mA at VR = 4 V, and forward voltage is ≤1.2 V at IF = 200 mA - confirming suitability for bidirectional protection and dual-role bias/reference use.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	5.89–6.51 V @ I_Z = 5 mA; defines stable regulation window for 6.2 V nominal reference designs
Power Dissipation (P_D)	500 mW @ T_L ≤ 75°C; sets maximum continuous power handling with specified lead length and thermal condition
Zener Impedance (Z_Z)	10 Ω @ I_Z = 5 mA; ensures minimal output voltage variation under load current changes in regulation mode
Knee Impedance (Z_ZK)	1300 Ω @ I_ZK = 250 µA; indicates sharpness of breakdown onset for low-current sensing or soft-clamp applications
Reverse Leakage (I_R)	≤1 mA @ V_R = 4 V; guarantees low standby current in voltage-monitoring circuits before full conduction
Operating Temperature	–65°C to +200°C; supports deployment in automotive engine compartments and industrial control enclosures
Tolerance	±5%; enables direct substitution in legacy 6.2 V reference designs without recalibration

Pinout & Package

DO-35 glass axial package with cathode identified by a single color band; leads are tinned copper alloy, 0.46 mm diameter, 25.4 mm minimum length. No internal terminals - two-terminal device with anode and cathode only.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Positive terminal during forward bias; grounded node in standard shunt regulator configuration	Connected to system ground or low-impedance return path to establish reference potential
Cathode	Negative terminal during forward bias; input node in shunt regulator; marked with color band	Connected to regulated voltage rail or overvoltage node; carries full Zener current during clamping

Key Features

Feature	Design Value
Glass-passivated junction	Enables stable long-term Zener voltage drift <0.1%/1000 hrs and high humidity resistance per MIL-STD-750 Method 1082
DO-35 hermetic glass package	Provides >10⁸ Ω insulation resistance and compatibility with wave soldering profiles up to 260°C peak
±5% V_Z tolerance	Eliminates need for external trimming resistors in cost-sensitive 6.2 V reference designs
Low knee impedance (1300 Ω)	Permits reliable regulation down to ~250 µA, supporting ultra-low-power sensor biasing
Lead temperature–based derating	Allows accurate thermal design using measured TL instead of junction estimation, simplifying heatsinking

Applications

Power Supply Feedback Reference	Overvoltage Clamp Protection
Use Scenario: Regulating output voltage in isolated flyback converters via optocoupler feedback network. IC Role / Device Role / Timing Role: Shunt reference providing precise 6.2 V threshold to TL431-like control ICs. Use Value: Tight 5.89–6.51 V window ensures ±1% output accuracy across line/load/temperature without calibration.	Use Scenario: Protecting microcontroller I/O pins against ESD-induced transients on 5 V rails. IC Role / Device Role / Timing Role: Low-capacitance clamping element diverting surge current to ground before damage occurs. Use Value: 1 mA leakage at 4 V prevents false triggering; 10 Ω Z_Z limits clamped voltage to <6.7 V during 1 A surge.
Sensor Bias Voltage Source	ADC Reference Stabilization
Use Scenario: Providing stable excitation voltage to resistive temperature detectors (RTDs) in industrial transmitters. IC Role / Device Role / Timing Role: Precision DC bias generator operating at 250 µA–5 mA, leveraging low knee impedance. Use Value: 1300 Ω Z_ZK ensures monotonic turn-on below 6 V, minimizing nonlinearity in ratiometric measurements.	Use Scenario: Stabilizing reference input of 12-bit SAR ADCs in data acquisition modules. IC Role / Device Role / Timing Role: Low-noise voltage reference replacing higher-cost bandgap ICs in cost-constrained systems. Use Value: 6.2 V nominal output with ±5% tolerance matches common 5 V ADC reference scaling ratios (e.g., 6.2 V → 5 V via resistor divider).

Power Supply Feedback Reference

Overvoltage Clamp Protection

Use Scenario: Regulating output voltage in isolated flyback converters via optocoupler feedback network.

IC Role / Device Role / Timing Role: Shunt reference providing precise 6.2 V threshold to TL431-like control ICs.

Use Value: Tight 5.89–6.51 V window ensures ±1% output accuracy across line/load/temperature without calibration.

Use Scenario: Protecting microcontroller I/O pins against ESD-induced transients on 5 V rails.

IC Role / Device Role / Timing Role: Low-capacitance clamping element diverting surge current to ground before damage occurs.

Use Value: 1 mA leakage at 4 V prevents false triggering; 10 Ω Z_Z limits clamped voltage to <6.7 V during 1 A surge.

Sensor Bias Voltage Source

ADC Reference Stabilization

Use Scenario: Providing stable excitation voltage to resistive temperature detectors (RTDs) in industrial transmitters.

IC Role / Device Role / Timing Role: Precision DC bias generator operating at 250 µA–5 mA, leveraging low knee impedance.

Use Value: 1300 Ω Z_ZK ensures monotonic turn-on below 6 V, minimizing nonlinearity in ratiometric measurements.

Use Scenario: Stabilizing reference input of 12-bit SAR ADCs in data acquisition modules.

IC Role / Device Role / Timing Role: Low-noise voltage reference replacing higher-cost bandgap ICs in cost-constrained systems.

Use Value: 6.2 V nominal output with ±5% tolerance matches common 5 V ADC reference scaling ratios (e.g., 6.2 V → 5 V via resistor divider).

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
1N4735A (ON Semiconductor)	6.2 V nominal, ±5%, 1.0 Ω Z_Z @ 41 mA - lower impedance but rated at higher test current and 1 W P_D	Requires series resistor recalculation due to different I_Z and thermal profile; unsuitable for <5 mA bias designs	Select 1N4735A only when ≥40 mA bias current and PCB space for TO-204AA (DO-41) are available
BZX55-C6V2 (Vishay)	6.2 V nominal, ±5%, 10 Ω Z_Z @ 5 mA, DO-35 package - identical electrical envelope and footprint	No marking or packaging differences affecting assembly; fully interchangeable in automated placement	Choose BZX55-C6V2 for dual-sourcing where same DO-35 mechanical fit and 5 mA regulation point are mandatory

Compared with 1N5995B_T50A, 1N4735A offers lower dynamic impedance but demands higher bias current and larger package, while BZX55-C6V2 matches its DO-35 form, 5 mA test point, and 10 Ω Z_Z, making it the only true footprint-and-function alternative.

Availability

1N5995B_T50A is available at Aetrix Electronics and suitable for power supply feedback reference, overvoltage clamp protection, and sensor bias voltage source applications requiring stable component supply, consistent parametric performance, and DO-35 through-hole compatibility.

Supply support for 1N5995B_T50A 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, signal conditioning, and discrete components before its acquisition by ON Semiconductor in 2016.

The 1N5995B_T50A belongs to Fairchild's legacy 1N59xxB Zener diode family, engineered for high-reliability voltage reference and clamping in industrial, automotive, and telecom infrastructure equipment.

FAQ

What is the exact Zener voltage range for 1N5995B_T50A at 5 mA test current?

The 1N5995B_T50A exhibits a guaranteed Zener voltage range of 5.89 V (minimum) to 6.51 V (maximum) when tested at I_Z = 5 mA and T_A = 25°C. This 6.2 V nominal rating with ±5% tolerance is confirmed in the Fairchild 1N5985B–1N6025B datasheet Rev. C2, Table 1. The 1N5995B_T50A must be operated within this window to meet specification compliance.

Does 1N5995B_T50A have a defined cathode marking, and how is it identified?

Yes, the 1N5995B_T50A uses a single color band on the DO-35 glass body to denote the cathode terminal, per standard industry practice and Fairchild's top-marking specification. The band aligns with the third-line marking "5B" in the device's 3-line laser mark (F logo / "99" / "5B"), and corresponds to the cathode connection in all schematic symbols and layout footprints.

What is the maximum reverse leakage current for 1N5995B_T50A at 4 V, and why does that matter?

The 1N5995B_T50A specifies a maximum reverse leakage current (I_R) of 1 mA at V_R = 4 V. This value ensures minimal parasitic loading on upstream voltage sources in high-impedance bias networks - critical for maintaining accuracy in RTD excitation, comparator threshold setting, and low-power supervisor circuits where sub-mA standby current is required.

Can 1N5995B_T50A be used in surface-mount designs?

No - the 1N5995B_T50A is exclusively packaged in the axial DO-35 glass case with 0.46 mm diameter leads, intended for through-hole mounting. It has no SMD variant or compatible lead-frame adaptation. For surface-mount equivalents, consider Fairchild's FMMT series or Vishay's MM3Z6V2, which are not drop-in replacements for 1N5995B_T50A.

How does thermal derating apply to 1N5995B_T50A in real-world PCB layouts?

Derating for the 1N5995B_T50A begins at 4.0 mW/°C above a lead temperature (T_L) of 75°C - not ambient or junction temperature. Engineers must measure T_L at 3/8″ from the package body during thermal validation. Exceeding 500 mW at elevated T_L risks parametric shift or catastrophic failure; the 1N5995B_T50A requires adequate copper pour and airflow to maintain T_L ≤75°C under full load.

1N5995B_T50A Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

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

Packaging:: Tape & Box (TB)

Product Status:: Obsolete

Voltage - Zener (Nom) (Vz):: 6.2 V

Tolerance:: ±5%

Power - Max:: 500 mW

Impedance (Max) (Zzt):: 10 Ohms

Current - Reverse Leakage @ Vr:: 1 µA @ 4 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

1N5995B_T50A FAQ

1.How can I place an order for 1N5995B_T50A through Aetrix?

Please submit a Request for Quotation (RFQ) for 1N5995B_T50A 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 1N5995B_T50A reliable?

The price and inventory of 1N5995B_T50A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5995B_T50A is usually 5 days.

3.What payment methods are accepted for 1N5995B_T50A?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5995B_T50A transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 1N5995B_T50A?

1N5995B_T50A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 1N5995B_T50A 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 1N5995B_T50A?

For technical support, including 1N5995B_T50A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5995B_T50A requirements.

6.How does Aetrix verify that 1N5995B_T50A is sourced from the original manufacturer or authorized distributors?

All 1N5995B_T50A 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 1N5995B_T50A meets industry standards.

7.What is the process for return or replacement of 1N5995B_T50A?

All 1N5995B_T50A units undergo pre-shipment inspection (PSI). If there is an issue with 1N5995B_T50A, 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 1N5995B_T50A part is unused and in its original packaging.

Return procedure for 1N5995B_T50A:

1.Submit a request within 90 days.

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

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