Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

onsemi 1N5951BRLG

Name: 1N5951BRLG
Brand: onsemi
SKU: 1N5951BRLG
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: 1N5951BRLG

Manufacturer:: onsemi

Category:: Single Zener Diodes

Package:: DO-204AL, DO-41, Axial

Datasheet:: 1N5951BRLG.pdf

Description:: DIODE ZENER 120V 3W AXIAL

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:9,508

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

1N5951BRLG from onsemi is a 3 W axial-lead Zener diode with nominal zener voltage of 120 V, ±5% tolerance, 3.1 Ω maximum zener impedance at 380 mA test current, and 0.25 μA reverse leakage at 91.2 V. It operates from −65 °C to +200 °C and is used for precision voltage regulation in power supply feedback loops, overvoltage protection circuits, and reference voltage generation.

For engineers reviewing the 1N5951BRLG datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage stability under thermal drift, surge capability (98 W @ 1 ms), Pb-free DO-41 package compatibility, and guaranteed limits on six electrical parameters including IZM, ZZT, and IR.

Technical Context

This device belongs to the 1N5913B series of silicon-oxide passivated Zener regulators, designed for stable DC voltage reference and clamping in industrial power supplies and analog circuitry. Its junction construction ensures low noise, tight voltage tolerance, and high ESD robustness (Class 3, >16 kV HBM).

The 1N5951BRLG delivers regulated output at 120 V nominal with temperature coefficient behavior typical of mid-to-high-voltage Zeners (≈+0.07 mV/°C per Figure 6), and supports steady-state dissipation up to 3 W at 75 °C lead temperature with 24 mW/°C derating above that point.

Key Specifications

Parameter	Value and Actual Design Meaning
Nominal Zener Voltage (V_Z)	120 V - precise regulation point at I_ZT = 380 mA, enabling accurate voltage clamping in high-voltage feedback networks
Zener Tolerance	±5% - guarantees V_Z between 114 V and 126 V, supporting designs requiring predictable trip thresholds
Max Zener Impedance (Z_ZT)	3.1 Ω @ 380 mA - low dynamic resistance ensures minimal output voltage variation under load transients
Max Reverse Leakage (I_R)	0.25 μA @ 91.2 V - negligible standby current, critical for low-power monitoring and battery-backed circuits
Steady-State Power Dissipation	3 W @ T_L = 75 °C - sufficient headroom for continuous operation in enclosed industrial enclosures with limited airflow
Surge Rating	98 W @ 1 ms - withstands short-duration line surges without degradation, suitable for transient suppression in AC/DC front-ends
Operating Temperature Range	−65 °C to +200 °C - validated performance across automotive under-hood, industrial motor drive, and aerospace environments

Pinout & Package

Package: DO-41 (Case 59-10), axial-lead, Pb-free thermosetting plastic. Cathode identified by black band; anode is unmarked lead. Mounting position unrestricted.

Pin/Terminal	Circuit Role	Design Meaning
Cathode (banded end)	Zener breakdown terminal	Connected to regulated output node; reverse-biased operation requires cathode at higher potential than anode
Anode (unbanded end)	Reference/reference return	Typically tied to system ground or feedback reference point; establishes polarity for proper biasing in shunt regulator topologies

Key Features

Feature	Design Value
ESD robustness	Class 3 (>16 kV HBM) - eliminates need for external ESD protection in board-level handling and assembly
Surge survivability	98 W single-pulse rating @ 1 ms - enables use in unfiltered AC line interfaces without additional MOVs or TVS stages
Precision voltage control	Guaranteed limits on six parameters (V_Z, I_ZT, Z_ZT, Z_ZK, I_R, I_ZM) - reduces design margining and qualification testing effort
Pb-free compliance	RoHS-compliant DO-41 package (G suffix) - meets global environmental regulations without sacrificing thermal or mechanical performance
Thermal reliability	200 °C max storage temperature - supports reflow, wave, and hand-solder processes with 260 °C peak lead temperature tolerance

Applications

Switch-Mode Power Supply Feedback	Industrial Overvoltage Clamp
Use Scenario: Used in optocoupler-coupled feedback loop of 400 V DC-output flyback converter to regulate output within ±1%. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 120 V threshold to TL431-like error amplifier input. Use Value: Tight ±5% V_Z tolerance and low 3.1 Ω Z_ZT minimize output drift across line/load/temperature, reducing need for post-production calibration.	Use Scenario: Placed across DC bus of 3-phase rectifier in variable-frequency drive to limit transient spikes during IGBT switching. IC Role / Device Role / Timing Role: Passive overvoltage clamp absorbing energy from inductive kickback events. Use Value: 98 W surge rating allows absorption of 1 ms transients without failure, extending capacitor and IGBT lifetime in harsh EMI environments.
High-Voltage Reference Generator	Medical Equipment Safety Monitor
Use Scenario: Provides stable 120 V reference for ADC input scaling in portable X-ray generator control board. IC Role / Device Role / Timing Role: Precision DC voltage source feeding resistive divider network into SAR ADC reference channel. Use Value: Low 0.25 μA leakage at 91.2 V prevents loading error in high-impedance divider, preserving measurement accuracy below 0.1% FS.	Use Scenario: Monitors isolation barrier voltage in Class II medical power supply to trigger shutdown if >126 V detected. IC Role / Device Role / Timing Role: Fail-safe voltage threshold detector in redundant safety circuit. Use Value: Guaranteed 114–126 V V_Z range enables deterministic trip window design, satisfying IEC 60601-1 creepage and fault response requirements.

Switch-Mode Power Supply Feedback

Industrial Overvoltage Clamp

Use Scenario: Used in optocoupler-coupled feedback loop of 400 V DC-output flyback converter to regulate output within ±1%.

IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 120 V threshold to TL431-like error amplifier input.

Use Value: Tight ±5% V_Z tolerance and low 3.1 Ω Z_ZT minimize output drift across line/load/temperature, reducing need for post-production calibration.

Use Scenario: Placed across DC bus of 3-phase rectifier in variable-frequency drive to limit transient spikes during IGBT switching.

IC Role / Device Role / Timing Role: Passive overvoltage clamp absorbing energy from inductive kickback events.

Use Value: 98 W surge rating allows absorption of 1 ms transients without failure, extending capacitor and IGBT lifetime in harsh EMI environments.

High-Voltage Reference Generator

Medical Equipment Safety Monitor

Use Scenario: Provides stable 120 V reference for ADC input scaling in portable X-ray generator control board.

IC Role / Device Role / Timing Role: Precision DC voltage source feeding resistive divider network into SAR ADC reference channel.

Use Value: Low 0.25 μA leakage at 91.2 V prevents loading error in high-impedance divider, preserving measurement accuracy below 0.1% FS.

Use Scenario: Monitors isolation barrier voltage in Class II medical power supply to trigger shutdown if >126 V detected.

IC Role / Device Role / Timing Role: Fail-safe voltage threshold detector in redundant safety circuit.

Use Value: Guaranteed 114–126 V V_Z range enables deterministic trip window design, satisfying IEC 60601-1 creepage and fault response requirements.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
1N5951BRL	Same electrical specs, but SnPb lead finish (non-Pb-free)	Acceptable where RoHS exemption applies (e.g., legacy military/aerospace programs)	Select only if Pb-free compliance is not required and cost sensitivity favors standard finish
MMBZ5267BLT1G	SOT-23 surface-mount, 100 V nominal, 225 mW P_D, ±5% - lower power, different package	Not suitable for 3 W continuous dissipation; limited to low-current bias/reference roles	Choose only for space-constrained PCBs where thermal management permits <250 mW operation

Compared with 1N5951BRLG, the 1N5951BRL offers identical regulation performance but lacks RoHS compliance, while MMBZ5267BLT1G trades power handling and thermal robustness for miniaturization-making it unsuitable as a direct replacement in high-energy clamping or regulation roles.

Availability

1N5951BRLG is available at Aetrix Electronics and suitable for industrial power supplies, medical safety monitors, and high-voltage test equipment requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for 1N5951BRLG 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

onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power management, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.

The 1N5913B series was developed to deliver high-reliability, high-stability Zener regulation in cost-sensitive industrial and power conversion applications where axial-lead packaging and wide temperature operation are essential.

FAQ

What is the maximum steady-state power dissipation for 1N5951BRLG at 75°C lead temperature?

The 1N5951BRLG has a maximum steady-state power dissipation of 3 W when measured at a lead temperature (T_L) of 75 °C with 3/8″ lead length. Above 75 °C, it derates linearly at 24 mW/°C. This rating is validated per onsemi's published thermal curves and reflects real-world mounting conditions using standard tie-point clips or PCB traces.

Does 1N5951BRLG meet RoHS requirements?

Yes, the "G" suffix in 1N5951BRLG explicitly denotes a Pb-free package compliant with RoHS Directive 2011/65/EU. The device uses thermosetting plastic encapsulation and tin-plated leads, with no lead, cadmium, mercury, hexavalent chromium, PBB, or PBDE substances above threshold limits.

What is the reverse leakage current specification for 1N5951BRLG at its rated voltage?

The 1N5951BRLG specifies a maximum reverse leakage current (I_R) of 0.25 μA when tested at 91.2 V (80% of nominal V_Z). This value is guaranteed across the full operating temperature range and is critical for maintaining accuracy in high-impedance reference divider networks.

Can 1N5951BRLG be used in surge protection applications?

Yes, the 1N5951BRLG is rated for 98 W non-repetitive surge power at 1 ms pulse width, making it suitable for transient voltage suppression in DC bus lines and power supply inputs. Its silicon-oxide passivated junction ensures consistent clamping behavior without parametric shift after surge events.

How does the zener impedance of 1N5951BRLG affect regulation accuracy?

The 1N5951BRLG has a maximum zener impedance (Z_ZT) of 3.1 Ω at 380 mA test current. This low dynamic resistance means output voltage deviation remains under ±0.3 V for ±100 mA load current changes-enabling tight regulation in feedback paths without additional compensation components.

1N5951BRLG Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: DO-204AL, DO-41, Axial

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Voltage - Zener (Nom) (Vz):: 120 V

Tolerance:: ±5%

Power - Max:: 3 W

Impedance (Max) (Zzt):: 380 Ohms

Current - Reverse Leakage @ Vr:: 1 µA @ 91.2 V

Voltage - Forward (Vf) (Max) @ If:: 1.5 V @ 200 mA

Operating Temperature:: -65°C ~ 200°C

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: Axial

1N5951BRLG FAQ

1.How can I place an order for 1N5951BRLG through Aetrix?

Please submit a Request for Quotation (RFQ) for 1N5951BRLG 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 1N5951BRLG reliable?

The price and inventory of 1N5951BRLG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5951BRLG is usually 5 days.

3.What payment methods are accepted for 1N5951BRLG?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5951BRLG transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 1N5951BRLG?

1N5951BRLG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 1N5951BRLG 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 1N5951BRLG?

For technical support, including 1N5951BRLG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5951BRLG requirements.

6.How does Aetrix verify that 1N5951BRLG is sourced from the original manufacturer or authorized distributors?

All 1N5951BRLG 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 1N5951BRLG meets industry standards.

7.What is the process for return or replacement of 1N5951BRLG?

All 1N5951BRLG units undergo pre-shipment inspection (PSI). If there is an issue with 1N5951BRLG, 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 1N5951BRLG part is unused and in its original packaging.

Return procedure for 1N5951BRLG:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-09 Counterfeit Electronic Components: How to Detect, Authenticate, and Test Suspect Parts

Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …

2026-09-08 Obsolete Electronic Components: How to Source and Evaluate Replacements

A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…