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

onsemi BZX84C15ET1

Name: BZX84C15ET1
Brand: onsemi
SKU: BZX84C15ET1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BZX84C15ET1

Manufacturer:: onsemi

Category:: Single Zener Diodes

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

Datasheet:: BZX84C15ET1.pdf

Description:: DIODE ZENER 15V 225MW SOT23-3

Quantity:: RFQ Add To RFQ list

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Inventory:7,075

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Product details

Overview

BZX84C15ET1 from onsemi is a 15 V, 225 mW surface-mount Zener diode in SOT-23 package, rated for 20 mA test current with 30 Ω dynamic impedance and 0.05 µA reverse leakage at 12 V, used for precision voltage regulation in space-constrained portable electronics.

For engineers reviewing the BZX84C15ET1 datasheet, pinout, applications, or equivalent options, this device serves as a low-power, ESD-hardened (Class 3, >16 kV HBM) voltage reference in battery-powered systems where thermal resistance (556 °C/W on FR-5), small footprint, and stable temperature coefficient (+9.2 mV/°C) are critical selection criteria.

Technical Context

The BZX84C15ET1 operates as a two-terminal voltage reference with cathode-anode polarity, relying on controlled reverse breakdown to maintain 15 V ±0.6 V across its terminals at I_ZT = 20 mA. Its 30 Ω Zener impedance at 20 mA ensures minimal output variation under load transients.

Designed for operation within −65°C to +150°C junction temperature range, it delivers stable regulation with +9.2 mV/°C temperature coefficient and 110 pF capacitance at 0 V bias, making it suitable for low-noise analog reference and overvoltage clamp functions in DC power rails.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	13.8 V min / 15.0 V nom / 15.6 V max @ I_ZT = 20 mA - defines tight regulation window for 15 V rail stabilization
Dynamic Impedance (Z_ZT)	30 Ω max @ I_ZT = 20 mA - limits output voltage shift under 1 mA load change to ≤30 mV
Reverse Leakage (I_R)	0.05 µA max @ V_R = 12 V - ensures negligible quiescent current draw in standby mode
Power Dissipation (P_D)	225 mW on FR-5 board @ T_A = 25°C - supports continuous operation without heatsinking in PCB-mounted applications
Temperature Coefficient	+9.2 mV/°C @ I_ZT = 5 mA - enables predictable drift compensation in temperature-varying environments
Capacitance (C)	110 pF @ V_R = 0 V, f = 1 MHz - low enough to avoid signal coupling in high-frequency bias networks
ESD Rating	Class 3 (>16 kV) per Human Body Model - withstands handling and board-level ESD events without degradation

Pinout & Package

SOT-23 (Case 318, Style 8) surface-mount package with 1.0 mm maximum height, 2.9 mm length, and 1.3 mm width; void-free thermosetting plastic case rated UL 94 V-0, Pb-free (G suffix), cathode indicated by band.

Pin/Terminal	Circuit Role	Design Meaning
1	Anode	Connected to lower-potential side of regulated node; forward-biased during normal operation
2	No Connection	Internally unconnected; must remain floating - no PCB trace or pad required
3	Cathode	Connected to higher-potential side; reverse-biased during Zener conduction; polarity band identifies this terminal

Key Features

Feature	Design Value
225 mW Power Rating	Enables stable voltage clamping in compact battery management and sensor bias circuits without derating at 25°C ambient
Low Dynamic Impedance	30 Ω at 20 mA ensures <±30 mV output deviation for ±1 mA load current changes
High ESD Robustness	Class 3 (>16 kV HBM) eliminates need for external ESD protection in handheld device front-end stages
Pb-Free Construction	G-suffix confirms RoHS-compliant, lead-free termination compatible with standard reflow profiles (260°C/10 s max)
Small Form Factor	SOT-23 footprint (2.9 × 1.3 × 1.0 mm) allows placement in high-density layouts such as smartphone PMIC support rails

Applications

Portable Device Power Rail Clamping	Low-Power Sensor Reference Voltage
Use Scenario: Clamp transient overvoltage on 15 V supply rail in Bluetooth headset during hot-plug events. IC Role / Device Role / Timing Role: Two-terminal shunt regulator absorbing surge energy above 15 V threshold. Use Value: Prevents damage to downstream LDOs and audio codecs by limiting rail excursion to ≤15.6 V with <0.05 µA standby leakage.	Use Scenario: Provide stable 15 V reference for analog front-end of MEMS pressure sensor in wearable health monitor. IC Role / Device Role / Timing Role: Precision DC voltage source establishing ADC input scaling point. Use Value: Delivers ±0.6 V tolerance and +9.2 mV/°C drift compensation, enabling <0.5% full-scale error over −20°C to +70°C operating range.
USB-C Port Overvoltage Protection	Industrial PLC Input Signal Conditioning
Use Scenario: Protect USB-C CC line receiver IC from accidental 20 V misconnection in dual-role port design. IC Role / Device Role / Timing Role: Fast-acting crowbar element triggered at 15.6 V breakdown. Use Value: Responds within nanoseconds to clamp fault energy, leveraging 225 W peak pulse rating (8 × 20 µs) without failure.	Use Scenario: Stabilize 15 V auxiliary supply feeding optocoupler isolators in DIN-rail mounted programmable logic controller. IC Role / Device Role / Timing Role: Low-drift voltage reference maintaining isolation barrier integrity. Use Value: Maintains regulation across −40°C to +85°C industrial temperature range with only 110 pF capacitance, avoiding signal coupling into isolated data lines.

Portable Device Power Rail Clamping

Low-Power Sensor Reference Voltage

Use Scenario: Clamp transient overvoltage on 15 V supply rail in Bluetooth headset during hot-plug events.

IC Role / Device Role / Timing Role: Two-terminal shunt regulator absorbing surge energy above 15 V threshold.

Use Value: Prevents damage to downstream LDOs and audio codecs by limiting rail excursion to ≤15.6 V with <0.05 µA standby leakage.

Use Scenario: Provide stable 15 V reference for analog front-end of MEMS pressure sensor in wearable health monitor.

IC Role / Device Role / Timing Role: Precision DC voltage source establishing ADC input scaling point.

Use Value: Delivers ±0.6 V tolerance and +9.2 mV/°C drift compensation, enabling <0.5% full-scale error over −20°C to +70°C operating range.

USB-C Port Overvoltage Protection

Industrial PLC Input Signal Conditioning

Use Scenario: Protect USB-C CC line receiver IC from accidental 20 V misconnection in dual-role port design.

IC Role / Device Role / Timing Role: Fast-acting crowbar element triggered at 15.6 V breakdown.

Use Value: Responds within nanoseconds to clamp fault energy, leveraging 225 W peak pulse rating (8 × 20 µs) without failure.

Use Scenario: Stabilize 15 V auxiliary supply feeding optocoupler isolators in DIN-rail mounted programmable logic controller.

IC Role / Device Role / Timing Role: Low-drift voltage reference maintaining isolation barrier integrity.

Use Value: Maintains regulation across −40°C to +85°C industrial temperature range with only 110 pF capacitance, avoiding signal coupling into isolated data lines.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MMBZ5245BLT1	15 V nominal, 500 mW rating, SOT-23 package, 30 Ω Z_ZT @ 20 mA, but higher leakage (1 µA @ 12 V)	Higher power dissipation supports longer-duration transients but increases standby current in battery-critical designs	Select when sustained 20 mA regulation is required beyond brief pulses; verify layout thermal relief for 500 mW
BZX84-C15-TP	15 V nominal, 225 mW, SOT-23, 30 Ω Z_ZT, but 0.1 µA leakage @ 12 V and no Class 3 ESD rating	Lacks ESD hardening and has 2× higher leakage, limiting use in consumer handhelds with frequent handling	Acceptable for cost-sensitive industrial control boards where ESD exposure is controlled and standby current is noncritical

Compared with MMBZ5245BLT1 and BZX84-C15-TP, the BZX84C15ET1 uniquely balances low-leakage operation (0.05 µA), certified ESD robustness (>16 kV), and precise 15 V regulation in a standard 225 mW SOT-23 footprint-making it optimal for portable, battery-constrained, and high-reliability applications.

Availability

BZX84C15ET1 is available at Aetrix Electronics and suitable for cellular phone power management, handheld medical sensor biasing, and high-density PC board voltage reference applications requiring stable component supply and full traceability.

Supply support for BZX84C15ET1 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, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and consumer markets.

The BZX84C15ET1 belongs to the BZX84CxxxET1 series of Zener regulators designed specifically for space-constrained, low-power voltage reference and overvoltage protection in portable and high-density electronic systems.

FAQ

What is the maximum reverse leakage current specification for BZX84C15ET1?

The BZX84C15ET1 has a maximum reverse leakage current of 0.05 µA at V_R = 12 V and T_A = 25°C. This ultra-low leakage ensures minimal power loss in battery-operated devices. The value is confirmed in the Electrical Characteristics table on page 3 of the official onsemi datasheet for BZX84C15ET1. Designers can rely on this spec when calculating standby current budgets for wearables or IoT edge nodes using the BZX84C15ET1.

Is BZX84C15ET1 pin-compatible with other SOT-23 Zener diodes?

The BZX84C15ET1 uses standard SOT-23 pinout: Pin 1 = Anode, Pin 2 = No Connection, Pin 3 = Cathode. While many SOT-23 Zeners share this configuration, pin compatibility alone does not guarantee functional equivalence. The BZX84C15ET1's specific 15 V regulation, 30 Ω impedance, and Class 3 ESD rating must be verified against target alternatives. Always confirm mechanical fit and electrical behavior before substitution in production designs involving the BZX84C15ET1.

Does BZX84C15ET1 support lead-free soldering processes?

Yes, the "G" suffix in BZX84C15ET1 indicates a Pb-free package compliant with RoHS requirements. It supports standard lead-free reflow profiles with a maximum soldering temperature of 260°C for 10 seconds, as specified in the Mechanical Characteristics section. This makes the BZX84C15ET1 suitable for modern automated assembly lines using SAC305 or similar lead-free pastes without risk of delamination or termination damage.

What is the thermal resistance of BZX84C15ET1 on FR-5 board?

The BZX84C15ET1 has a thermal resistance of 556 °C/W from junction-to-ambient when mounted on an FR-5 board, per the Maximum Ratings table. This value determines how much the junction temperature rises above ambient for each milliwatt dissipated. At its full 225 mW rating, the junction would rise ~125°C above ambient-so derating is essential for reliable long-term operation. This parameter is critical when designing thermal margins for the BZX84C15ET1 in enclosed or high-ambient environments.

Can BZX84C15ET1 be used for ESD protection in USB interface circuits?

The BZX84C15ET1 is rated Class 3 (>16 kV) per Human Body Model, confirming robustness against handling ESD-but it is not optimized as a dedicated ESD suppressor. Its 15 V breakdown voltage and 225 W peak pulse rating (8 × 20 µs) make it suitable for secondary overvoltage clamping, not primary ESD strike absorption. For USB data line protection, a dedicated low-capacitance TVS like ESD9X5.0ST5G is preferred. The BZX84C15ET1 remains appropriate for 15 V rail clamping adjacent to USB power circuitry.

BZX84C15ET1 Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

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

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Voltage - Zener (Nom) (Vz):: 15 V

Tolerance:: ±6%

Power - Max:: 225 mW

Impedance (Max) (Zzt):: 30 Ohms

Current - Reverse Leakage @ Vr:: 50 nA @ 10.5 V

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

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3 (TO-236)

BZX84C15ET1 FAQ

1.How can I place an order for BZX84C15ET1 through Aetrix?

Please submit a Request for Quotation (RFQ) for BZX84C15ET1 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 BZX84C15ET1 reliable?

The price and inventory of BZX84C15ET1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84C15ET1 is usually 5 days.

3.What payment methods are accepted for BZX84C15ET1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84C15ET1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZX84C15ET1?

BZX84C15ET1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZX84C15ET1 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 BZX84C15ET1?

For technical support, including BZX84C15ET1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84C15ET1 requirements.

6.How does Aetrix verify that BZX84C15ET1 is sourced from the original manufacturer or authorized distributors?

All BZX84C15ET1 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 BZX84C15ET1 meets industry standards.

7.What is the process for return or replacement of BZX84C15ET1?

All BZX84C15ET1 units undergo pre-shipment inspection (PSI). If there is an issue with BZX84C15ET1, 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 BZX84C15ET1 part is unused and in its original packaging.

Return procedure for BZX84C15ET1:

1.Submit a request within 90 days.

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

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