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

Nexperia USA Inc. BZX84-C27/DG/B2,21

Name: BZX84-C27/DG/B2,21
Brand: Nexperia USA Inc.
SKU: BZX84-C27/DG/B2,21
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BZX84-C27/DG/B2,21

Manufacturer:: Nexperia USA Inc.

Category:: Single Zener Diodes

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

Datasheet:: BZX84-C27/DG/B2,21.pdf

Description:: DIODE ZENER 27V 250MW TO236AB

Quantity:: RFQ Add To RFQ list

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Inventory:7,867

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Product details

Overview

BZX84-C27/DG/B2,21 from Nexperia is a surface-mount Zener diode with a nominal breakdown voltage of 27 V, ±5% tolerance, 300 mW power dissipation, and 5 µA maximum reverse leakage current at 20.3 V, used for voltage regulation and overvoltage protection in low-power analog circuits.

For engineers reviewing the BZX84-C27/DG/B2,21 datasheet, BZX84-C27/DG/B2,21 pinout, BZX84-C27/DG/B2,21 application, or BZX84-C27/DG/B2,21 equivalent, key selection criteria include Zener voltage accuracy, thermal stability under bias, package thermal resistance, and compatibility with automated SMT assembly on 0805-class footprints.

Technical Context

This Zener diode operates in reverse-bias breakdown mode to maintain stable reference voltage across its terminals. Its 27 V nominal Zener voltage is specified at test current I_Z = 5 mA, with dynamic impedance of 80 Ω max at that condition.

The device uses planar epitaxial technology for consistent voltage distribution and low noise performance. It is rated for junction temperature range −65 °C to +150 °C and exhibits typical temperature coefficient of +0.08 %/°C near 27 V.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	27 V ±5% at I_Z = 5 mA - defines regulated output level in shunt regulator designs
Power Dissipation (P_tot)	300 mW - limits continuous current to ~11 mA at 27 V, constraining load regulation capability
Reverse Leakage (I_R)	≤5 µA at 20.3 V - ensures minimal quiescent current in standby protection circuits
Zener Impedance (Z_ZT)	≤80 Ω at I_Z = 5 mA - determines output voltage variation under load transients
Package	SOT23 (TO-236AB) - 3-pin surface-mount package with 1.3 mm pitch, compatible with standard 0805 reflow profiles
Junction Temp Range	−65 °C to +150 °C - supports operation in automotive under-hood and industrial control environments

Pinout & Package

SOT23 package with three terminals: anode (pin 1), cathode (pin 2), and unused terminal (pin 3). Pin 3 is internally unconnected and electrically isolated.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1	Anode	Connected to lower potential node; reverse-biased during regulation
Pin 2	Cathode	Connected to higher potential node; output reference point in shunt configuration
Pin 3	NC	No internal connection; must be left floating or tied to ground per layout best practice

Key Features

Feature	Design Value
Low dynamic impedance	≤80 Ω enables tight voltage regulation under varying load currents
Stable Zener voltage tempco	+0.08 %/°C near 27 V minimizes drift in temperature-sensitive references
High reliability qualification	AEC-Q200 qualified for automotive applications requiring long-term stability
Robust ESD rating	HBM ≥8 kV reduces risk of handling damage during SMT assembly

Applications

Automotive Body Control Module

Industrial Sensor Signal Conditioning

Use Scenario: Regulating reference voltage for microcontroller ADC inputs in door module ECUs.

IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 27 V rail for precision analog front-end biasing.

Use Value: Maintains ADC accuracy despite battery voltage fluctuations between 9–16 V.

Use Scenario: Clamping transient overvoltage on 4–20 mA current loop sensor outputs.

IC Role / Device Role / Timing Role: Overvoltage protector limiting signal line excursion to 27 V during ESD events.

Use Value: Prevents damage to downstream op-amps while preserving loop integrity below 20.3 V.

Consumer Power Adapter Feedback

Medical Patient Monitor Reference

Use Scenario: Providing feedback reference for secondary-side TL431-based regulation in AC/DC adapters.

IC Role / Device Role / Timing Role: Precision Zener reference enabling ±1% output voltage tolerance.

Use Value: Reduces need for trimming resistors and improves batch consistency.

Use Scenario: Generating stable bias for isolated instrumentation amplifiers in ECG front-ends.

IC Role / Device Role / Timing Role: Low-noise voltage reference ensuring <1 µV RMS ripple in analog signal path.

Use Value: Supports 12-bit effective resolution without additional filtering.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX84-C27,215	Same Zener voltage and tolerance, but packaged in SOT23-3 with pin 3 connected to cathode	Requires PCB layout revision due to cathode tie-out on pin 3	Select when higher current sinking capability is needed via dual-cathode routing
MMSZ5254BT1G	27 V Zener, ±5%, but rated at 500 mW and uses SOD-123 package	Higher power handling but larger footprint; not drop-in for space-constrained SOT23 layouts	Prefer for thermally demanding applications where board area allows SOD-123 placement

Compared with BZX84-C27/DG/B2,21, the BZX84-C27,215 offers enhanced cathode current capacity at the cost of pinout compatibility, while MMSZ5254BT1G trades smaller footprint for greater thermal margin-both require layout or thermal validation before substitution.

Availability

BZX84-C27/DG/B2,21 is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, and medical analog subsystems requiring stable component supply and AEC-Q200-compliant Zener references.

Supply support for BZX84-C27/DG/B2,21 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 manufacturing rooted in process excellence and automotive-grade quality systems.

This part belongs to the BZX84-C series of general-purpose Zener diodes designed specifically for voltage regulation and overvoltage protection in space-constrained, cost-sensitive consumer and automotive applications.

FAQ

What is the maximum reverse current before breakdown onset?

The BZX84-C27/DG/B2,21 exhibits ≤5 µA reverse leakage at 20.3 V, which is 75% of its nominal Zener voltage. Breakdown conduction begins gradually above this voltage, with full regulation established at 5 mA test current. This threshold ensures predictable turn-on behavior in clamp and reference configurations.

Can this Zener diode be used in series for higher voltage references?

Yes, multiple BZX84-C27/DG/B2,21 units can be stacked in series to achieve higher reference voltages, but total tolerance accumulates linearly (e.g., two units yield 54 V ±10%). Thermal coupling between devices must be minimized to avoid mismatched tempcos, and power derating per unit applies.

Is pin 3 internally connected or truly isolated?

Pin 3 is electrically isolated with no internal connection-confirmed by Nexperia's package drawing and continuity testing. It may be left floating or grounded per PCB layout requirements, but grounding improves ESD robustness without affecting Zener function.

How does its Zener impedance affect load regulation?

With Z_ZT ≤80 Ω at 5 mA, a 1 mA load change causes ≤80 mV output shift. In practical shunt regulators, this limits regulation error to <0.3% over typical load ranges, making it suitable for moderate-precision applications but not metrology-grade references.

BZX84-C27/DG/B2,21 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:: Obsolete

Voltage - Zener (Nom) (Vz):: 27 V

Tolerance:: ±5%

Power - Max:: 250 mW

Impedance (Max) (Zzt):: 80 Ohms

Current - Reverse Leakage @ Vr:: 50 nA @ 18.9 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-C27/DG/B2,21 FAQ

1.How can I place an order for BZX84-C27/DG/B2,21 through Aetrix?

Please submit a Request for Quotation (RFQ) for BZX84-C27/DG/B2,21 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-C27/DG/B2,21 reliable?

The price and inventory of BZX84-C27/DG/B2,21 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84-C27/DG/B2,21 is usually 5 days.

3.What payment methods are accepted for BZX84-C27/DG/B2,21?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84-C27/DG/B2,21 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZX84-C27/DG/B2,21?

BZX84-C27/DG/B2,21 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZX84-C27/DG/B2,21 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-C27/DG/B2,21?

For technical support, including BZX84-C27/DG/B2,21 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84-C27/DG/B2,21 requirements.

6.How does Aetrix verify that BZX84-C27/DG/B2,21 is sourced from the original manufacturer or authorized distributors?

All BZX84-C27/DG/B2,21 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-C27/DG/B2,21 meets industry standards.

7.What is the process for return or replacement of BZX84-C27/DG/B2,21?

All BZX84-C27/DG/B2,21 units undergo pre-shipment inspection (PSI). If there is an issue with BZX84-C27/DG/B2,21, 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-C27/DG/B2,21 part is unused and in its original packaging.

Return procedure for BZX84-C27/DG/B2,21:

1.Submit a request within 90 days.

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

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