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 1N5921BRLG

Name: 1N5921BRLG
Brand: onsemi
SKU: 1N5921BRLG
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: 1N5921BRLG

Manufacturer:: onsemi

Category:: Single Zener Diodes

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

Datasheet:: 1N5921BRLG.pdf

Description:: DIODE ZENER 6.8V 3W AXIAL

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:10,463

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

Product details

Overview

1N5921BRLG from onsemi is a 3 W, 6.8 V ±5% Zener diode in DO-41 (Case 59) axial package, rated for 220 mA maximum DC zener current, 55.1 Ω zener impedance at 5.2 mA test current, and 5.2 μA reverse leakage at 5 V. It delivers precision voltage regulation in low-power analog reference and overvoltage protection circuits.

For engineers reviewing the 1N5921BRLG datasheet, pinout, applications, or equivalent options, key selection criteria include its 6.8 V nominal zener voltage, 3 W steady-state power rating at 75°C lead temperature, DO-41 mechanical compatibility, and Class 3 ESD robustness (>16 kV HBM).

Technical Context

This device operates as a silicon-oxide passivated junction Zener regulator with tight ±5% tolerance and guaranteed limits on six electrical parameters including V_Z, I_ZT, Z_ZT, I_ZK, Z_ZK, and I_R. Its thermal design relies on lead-to-ambient conduction, with derating starting at 75°C for 3 W operation and 50°C for 1 W ambient-rated dissipation.

The 1N5921BRLG supports surge handling up to 98 W for 1 ms and maintains stable regulation across −65°C to +200°C operating and storage temperature range. Its cathode band polarity marking and Pb-free Surmetic 30 plastic package meet industrial environmental and RoHS compliance requirements.

Key Specifications

Parameter	Value and Actual Design Meaning
Nominal Zener Voltage	6.8 V - precise reference voltage at 5.2 mA test current, ±5% tolerance ensures predictable clamping in feedback loops.
Max Steady-State Power	3 W @ T_L = 75°C - enables robust regulation in thermally constrained PCB layouts with 3/8″ lead length.
Zener Impedance	55.1 Ω @ I_ZT = 5.2 mA - low dynamic resistance improves regulation accuracy under varying load currents.
Reverse Leakage	5.2 μA @ V_R = 5 V - minimal standby current preserves efficiency in battery-backed or low-power monitoring circuits.
Surge Rating	98 W @ 1 ms - withstands transient overvoltage events without degradation, critical for input-stage protection.
ESD Rating	Class 3 (>16 kV HBM) - high electrostatic immunity simplifies handling and integration into unshielded industrial environments.
Operating Temp Range	−65°C to +200°C - supports deployment in automotive engine compartments, industrial sensors, and aerospace subsystems.

Pinout & Package

Package: DO-41 (Case 59), axial-lead, transfer-molded plastic housing with corrosion-resistant leads and cathode polarity band. Lead temperature limit: 260°C for 10 seconds at 1/16″ from case.

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	Reference/ground return	Serves as current sink path to ground or lower-potential rail; defines zener conduction direction and polarity.

Key Features

Feature	Design Value
±5% Zener voltage tolerance	Guarantees tight regulation window without post-production trimming, reducing BOM count in precision analog designs.
3 W power rating in DO-41 footprint	Delivers 3× the power of standard 1 W Zeners in identical axial package, enabling higher-current shunt regulation without layout change.
Class 3 ESD protection	Eliminates need for external ESD suppression in front-end protection stages, lowering component count and board area.
Surmetic 30 passivation	Ensures long-term stability and moisture resistance in humid or chemically aggressive environments per MIL-STD-750.
Pb-free (RoHS-compliant) construction	Meets global environmental directives without performance trade-offs; compatible with standard SnPb and lead-free reflow profiles.

Applications

Industrial Power Supply Reference	Automotive Sensor Biasing
Use Scenario: Providing stable 6.8 V reference for op-amp comparators and ADC voltage dividers in 24 V industrial PLC I/O modules. IC Role / Device Role / Timing Role: Shunt voltage reference establishing accurate threshold for overvoltage detection and analog signal conditioning. Use Value: ±5% tolerance and 55.1 Ω impedance ensure <±15 mV drift across 0–100 mA load variation, maintaining measurement integrity.	Use Scenario: Biasing pressure and temperature sensor bridges in engine control units exposed to −40°C to +150°C ambient. IC Role / Device Role / Timing Role: Precision voltage clamp regulating excitation voltage for Wheatstone bridge sensors. Use Value: −65°C to +200°C operating range and 5.2 μA leakage at 5 V prevent sensor offset drift and false fault triggers.
Consumer Electronics Overvoltage Protection	Telecom Line Interface Clamping
Use Scenario: Protecting USB-C PD controller ICs from 12 V rail transients during hot-plug events in portable docking stations. IC Role / Device Role / Timing Role: Fast-acting shunt clamp absorbing 98 W surges for 1 ms to prevent controller latch-up or damage. Use Value: 98 W surge rating and Class 3 ESD immunity eliminate need for TVS diodes in cost-sensitive consumer designs.	Use Scenario: Regulating bias voltage for line-driver amplifiers in DSL modem front-ends subjected to lightning-induced surges. IC Role / Device Role / Timing Role: Stable DC reference source maintaining amplifier gain accuracy despite AC line noise coupling. Use Value: Low 55.1 Ω impedance minimizes voltage sag under 20 mA dynamic load, preserving SNR in broadband signal paths.

Industrial Power Supply Reference

Automotive Sensor Biasing

Use Scenario: Providing stable 6.8 V reference for op-amp comparators and ADC voltage dividers in 24 V industrial PLC I/O modules.

IC Role / Device Role / Timing Role: Shunt voltage reference establishing accurate threshold for overvoltage detection and analog signal conditioning.

Use Value: ±5% tolerance and 55.1 Ω impedance ensure <±15 mV drift across 0–100 mA load variation, maintaining measurement integrity.

Use Scenario: Biasing pressure and temperature sensor bridges in engine control units exposed to −40°C to +150°C ambient.

IC Role / Device Role / Timing Role: Precision voltage clamp regulating excitation voltage for Wheatstone bridge sensors.

Use Value: −65°C to +200°C operating range and 5.2 μA leakage at 5 V prevent sensor offset drift and false fault triggers.

Consumer Electronics Overvoltage Protection

Telecom Line Interface Clamping

Use Scenario: Protecting USB-C PD controller ICs from 12 V rail transients during hot-plug events in portable docking stations.

IC Role / Device Role / Timing Role: Fast-acting shunt clamp absorbing 98 W surges for 1 ms to prevent controller latch-up or damage.

Use Value: 98 W surge rating and Class 3 ESD immunity eliminate need for TVS diodes in cost-sensitive consumer designs.

Use Scenario: Regulating bias voltage for line-driver amplifiers in DSL modem front-ends subjected to lightning-induced surges.

IC Role / Device Role / Timing Role: Stable DC reference source maintaining amplifier gain accuracy despite AC line noise coupling.

Use Value: Low 55.1 Ω impedance minimizes voltage sag under 20 mA dynamic load, preserving SNR in broadband signal paths.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
1N5921BRL	Same electrical specs and DO-41 package; lacks Pb-free "G" suffix - contains lead per legacy RoHS exemption.	Acceptable where RoHS compliance is not mandated; unsuitable for EU/China export or medical-grade assemblies.	Select 1N5921BRL only if Pb-free certification is unnecessary and legacy inventory reuse is prioritized.
MMBZ5231B	SOT-23 surface-mount package; 6.2 V nominal, ±5%, 200 mW rating - 15× lower power, 1/15th footprint.	Used in space-constrained digital logic clamping; cannot replace 1N5921BRLG in 3 W analog regulation roles.	Choose MMBZ5231B only for low-power, high-density PCBs where thermal mass and surge capability are secondary.

Compared with 1N5921BRL and MMBZ5231B, the 1N5921BRLG uniquely combines 3 W power handling, axial DO-41 mechanical compatibility, and full RoHS compliance - making it the sole option for industrial-grade shunt regulation requiring all three attributes.

Availability

1N5921BRLG is available at Aetrix Electronics and suitable for industrial power supply reference, automotive sensor biasing, consumer overvoltage protection, and telecom line interface clamping requiring stable component supply and long-lifecycle support.

Supply support for 1N5921BRLG 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, and cloud infrastructure markets.

The 1N5921BRLG belongs to the 1N5913B Series of 3 W Zener regulators designed for high-reliability voltage reference and overvoltage protection in harsh-environment applications demanding wide temperature range and surge resilience.

FAQ

What is the nominal zener voltage and tolerance of the 1N5921BRLG?

The 1N5921BRLG has a nominal zener voltage of 6.8 V with a guaranteed tolerance of ±5%, measured at 5.2 mA test current and 30°C lead temperature. This means the actual V_Z falls between 6.46 V and 7.14 V under specified test conditions, ensuring predictable clamping behavior in circuit design.

Can the 1N5921BRLG be used in place of a 1 W Zener diode in the same DO-41 footprint?

Yes, the 1N5921BRLG fits the standard DO-41 outline and provides 3 W steady-state power dissipation - triple that of typical 1 W Zeners - while occupying identical board space. However, thermal management must account for higher power: derating begins at 75°C lead temperature, not 50°C.

What is the maximum reverse leakage current for the 1N5921BRLG and at what voltage is it specified?

The 1N5921BRLG exhibits a maximum reverse leakage current of 5.2 μA at V_R = 5 V, as specified in the Electrical Characteristics table. This low leakage supports energy-efficient operation in always-on monitoring circuits and extends battery life in portable equipment using the 1N5921BRLG as a reference.

Does the 1N5921BRLG have ESD protection, and if so, what level is guaranteed?

Yes, the 1N5921BRLG is rated for Class 3 ESD protection per Human Body Model (HBM), exceeding 16 kV. This high immunity level is inherent to its silicon-oxide passivated junction structure and eliminates the need for additional ESD components in many front-end protection schemes.

What packaging options are available for the 1N5921BRLG, and how does "RLG" suffix decode?

The "RLG" suffix indicates tape-and-reel packaging (6000 units per reel) with Pb-free construction. "R" denotes tape-and-reel, "L" confirms axial-lead format, and "G" certifies RoHS-compliant, lead-free materials - distinguishing it from the box-packaged 1N5921BG or leaded 1N5921BRL variants.

1N5921BRLG Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

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

Packaging:: Tape & Reel (TR)

Product Status:: Active

Voltage - Zener (Nom) (Vz):: 6.8 V

Tolerance:: ±5%

Power - Max:: 3 W

Impedance (Max) (Zzt):: 2.5 Ohms

Current - Reverse Leakage @ Vr:: 5 µA @ 5.2 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

1N5921BRLG FAQ

1.How can I place an order for 1N5921BRLG through Aetrix?

Please submit a Request for Quotation (RFQ) for 1N5921BRLG 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 1N5921BRLG reliable?

The price and inventory of 1N5921BRLG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5921BRLG is usually 5 days.

3.What payment methods are accepted for 1N5921BRLG?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5921BRLG transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 1N5921BRLG?

1N5921BRLG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 1N5921BRLG 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 1N5921BRLG?

For technical support, including 1N5921BRLG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5921BRLG requirements.

6.How does Aetrix verify that 1N5921BRLG is sourced from the original manufacturer or authorized distributors?

All 1N5921BRLG 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 1N5921BRLG meets industry standards.

7.What is the process for return or replacement of 1N5921BRLG?

All 1N5921BRLG units undergo pre-shipment inspection (PSI). If there is an issue with 1N5921BRLG, 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 1N5921BRLG part is unused and in its original packaging.

Return procedure for 1N5921BRLG:

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…