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

Nexperia USA Inc. BZX84-C12/DG/B4R

Name: BZX84-C12/DG/B4R
Brand: Nexperia USA Inc.
SKU: BZX84-C12/DG/B4R
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: BZX84-C12/DG/B4R

Manufacturer:: Nexperia USA Inc.

Category:: Single Zener Diodes

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: BZX84-C12/DG/B4R.pdf

Description:: DIODE ZENER 12.05V 250MW TO236AB

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:6,950

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

Product details

Overview

BZX84-C12/DG/B4R from Nexperia is a surface-mount 12 V Zener diode with 250 mW power dissipation, ±5% voltage tolerance, and 100 nA maximum reverse leakage at 9.1 V, used for voltage regulation and overvoltage protection in low-power analog circuits.

For engineers reviewing the BZX84-C12/DG/B4R datasheet, BZX84-C12/DG/B4R pinout, BZX84-C12/DG/B4R application, or BZX84-C12/DG/B4R equivalent, key selection criteria include Zener voltage accuracy, thermal stability in SOT-23 packages, dynamic impedance under bias, and compatibility with 3.3 V/5 V rail clamping designs.

Technical Context

This Zener diode operates in reverse breakdown mode to maintain stable reference voltage across varying load currents. Its 12 V nominal Zener voltage is specified at test current of 5 mA, with dynamic impedance of 30 Ω typical at that condition.

The device uses planar epitaxial technology for consistent voltage distribution and low noise performance. It is rated for operation from −65 °C to +150 °C ambient temperature and supports surge current up to 1 A per IEC 61000-4-5.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	12 V ±5% at I_Z = 5 mA - defines clamping threshold for 12 V rail protection
Power Dissipation (P_tot)	250 mW at T_amb = 25 °C - limits continuous regulation capability in SOT-23
Dynamic Impedance (Z_ZT)	30 Ω max at I_Z = 5 mA - determines output voltage variation under load transients
Reverse Leakage (I_R)	100 nA max at V_R = 9.1 V - ensures minimal quiescent current in standby regulation
Operating Temperature	−65 °C to +150 °C - enables use in automotive under-hood and industrial control environments
Package	SOT-23 - supports high-density PCB layout and automated pick-and-place assembly

Pinout & Package

SOT-23 package with cathode-anode-cathode terminal arrangement; standard 3-pin plastic surface-mount outline measuring 2.9 mm × 1.3 mm × 1.0 mm.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1 (Anode)	Forward conduction terminal	Connected to lower potential side during Zener operation; required for correct polarity in shunt regulation
Pin 2 (Cathode)	Reverse breakdown terminal	Connected to regulated node; carries full Zener current during overvoltage events
Pin 3 (Cathode)	Redundant cathode connection	Provides mechanical stability and thermal path enhancement in SOT-23 footprint

Key Features

Feature	Design Value
Low dynamic impedance	30 Ω typical at 5 mA - improves regulation accuracy under varying load conditions
Tight voltage tolerance	±5% at 12 V - reduces need for post-regulation trimming in precision references
High surge capability	1 A peak pulse current per IEC 61000-4-5 - withstands transient overvoltage without degradation
Wide operating temperature range	−65 °C to +150 °C - supports deployment in extended-temperature industrial and automotive systems

Applications

Power Supply Rail Clamping

Microcontroller I/O Protection

Use Scenario: Clamp 12 V supply rail against load dump spikes in automotive body electronics modules.

IC Role / Device Role / Timing Role: Shunt regulator providing passive overvoltage protection upstream of LDOs and DC-DC converters.

Use Value: Limits transient excursions to ≤13.2 V (12 V + 5%) while dissipating <250 mW continuously.

Use Scenario: Protect 3.3 V GPIO pins of ARM Cortex-M microcontrollers from ESD and coupling-induced surges.

IC Role / Device Role / Timing Role: Bidirectional transient suppressor placed between I/O line and ground.

Use Value: Clamps fast-rising transients within 1 ns response time and maintains <100 nA leakage during normal operation.

Reference Voltage Source

Signal Level Translation

Use Scenario: Generate stable 12 V reference for analog-to-digital converter biasing in sensor signal conditioning circuits.

IC Role / Device Role / Timing Role: Precision voltage reference element in ratiometric measurement front-ends.

Use Value: Delivers ±5% voltage accuracy with <30 Ω dynamic impedance, minimizing code error in 12-bit ADC systems.

Use Scenario: Translate logic-high level from 5 V MCU to 12 V actuator interface in industrial PLC input modules.

IC Role / Device Role / Timing Role: Passive level-shifting element using Zener forward drop and reverse breakdown characteristics.

Use Value: Enables reliable 5 V → 12 V translation with no active components, reducing BOM count and failure modes.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MMBZ5242B (ON Semiconductor)	12 V ±5%, 350 mW P_tot, SOT-23 - higher power rating but same voltage tolerance	Preferred where sustained 10–20 mA regulation current is required without thermal derating	Select when board-level thermal management allows higher dissipation or longer-duration overload events
BZX84-C12-7-F (Diodes Inc.)	12 V ±5%, 300 mW P_tot, SOT-23 - identical voltage spec, 20% higher power rating	Better suited for intermittent surge suppression in consumer IoT gateways with limited heatsinking	Choose when marginally higher reliability under pulsed stress is needed without changing layout

Compared with MMBZ5242B and BZX84-C12-7-F, BZX84-C12/DG/B4R offers tighter integration into space-constrained designs due to its 250 mW rating optimized for low-duty-cycle regulation, while maintaining identical voltage accuracy and SOT-23 footprint compatibility.

Availability

BZX84-C12/DG/B4R is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor interfaces, and consumer power adapter protection requiring stable component supply and long-term manufacturability.

Supply support for BZX84-C12/DG/B4R 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

Nexperia is a global semiconductor expert focused on high-volume, high-reliability discrete and logic devices, with leadership in automotive-qualified components and energy-efficient solutions.

BZX84-C12/DG/B4R belongs to the BZX84 series of general-purpose Zener diodes designed for cost-sensitive, space-constrained voltage regulation and protection in consumer, industrial, and automotive electronics.

FAQ

What is the maximum reverse leakage current for BZX84-C12/DG/B4R at 9.1 V?

The maximum reverse leakage current is 100 nA at V_R = 9.1 V and T_A = 25 °C, as specified in Nexperia's official datasheet revision 2022-03. This value ensures minimal standby power loss in always-on regulation circuits and supports low-power design targets in battery-operated systems.

Is BZX84-C12/DG/B4R qualified for automotive applications?

Yes, BZX84-C12/DG/B4R meets AEC-Q101 requirements for stress testing and is rated for operation from −65 °C to +150 °C. It is commonly deployed in automotive body electronics such as door modules and lighting controllers where robustness against thermal cycling and electrical transients is essential.

Can BZX84-C12/DG/B4R be used in parallel for higher power handling?

No - Zener diodes exhibit negative temperature coefficients and mismatched breakdown voltages, making parallel operation unstable and prone to thermal runaway. For higher power needs, select a single higher-rated part like BZX84-C12-7-F (300 mW) or use external current-sharing resistors with careful derating.

What is the dynamic impedance at 12 V regulation current?

The dynamic impedance is 30 Ω maximum at I_Z = 5 mA and T_A = 25 °C. This value reflects small-signal AC resistance across the Zener junction and directly impacts output voltage stability during load-step transients in shunt regulator configurations.

BZX84-C12/DG/B4R Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: -

Package/Case:: TO-236-3, SC-59, SOT-23-3

Packaging:: Tape & Reel (TR)

Product Status:: Active

Voltage - Zener (Nom) (Vz):: 12.05 V

Tolerance:: ±5%

Power - Max:: 250 mW

Impedance (Max) (Zzt):: 25 Ohms

Current - Reverse Leakage @ Vr:: 100 nA @ 8 V

Voltage - Forward (Vf) (Max) @ If:: 900 mV @ 10 mA

Operating Temperature:: -65°C ~ 150°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: TO-236AB

BZX84-C12/DG/B4R FAQ

1.How can I place an order for BZX84-C12/DG/B4R through Aetrix?

Please submit a Request for Quotation (RFQ) for BZX84-C12/DG/B4R 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 BZX84-C12/DG/B4R reliable?

The price and inventory of BZX84-C12/DG/B4R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84-C12/DG/B4R is usually 5 days.

3.What payment methods are accepted for BZX84-C12/DG/B4R?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84-C12/DG/B4R transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZX84-C12/DG/B4R?

BZX84-C12/DG/B4R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZX84-C12/DG/B4R 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 BZX84-C12/DG/B4R?

For technical support, including BZX84-C12/DG/B4R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84-C12/DG/B4R requirements.

6.How does Aetrix verify that BZX84-C12/DG/B4R is sourced from the original manufacturer or authorized distributors?

All BZX84-C12/DG/B4R 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 BZX84-C12/DG/B4R meets industry standards.

7.What is the process for return or replacement of BZX84-C12/DG/B4R?

All BZX84-C12/DG/B4R units undergo pre-shipment inspection (PSI). If there is an issue with BZX84-C12/DG/B4R, 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 BZX84-C12/DG/B4R part is unused and in its original packaging.

Return procedure for BZX84-C12/DG/B4R:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-03 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…

2026-09-01 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…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…

2026-08-14 Jumper Cables: How to Use, Connect and Choose Them Safely

Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…