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Home > Products > Discrete Semiconductor Products > Diodes > Zener > Zener Diode Arrays

NXP Semiconductors BZB84-B51,215

Name: BZB84-B51,215
Brand: NXP Semiconductors
SKU: BZB84-B51,215
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BZB84-B51,215

Manufacturer:: NXP Semiconductors

Category:: Zener Diode Arrays

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

Datasheet:: BZB84-B51,215.pdf

Description:: NOW NEXPERIA BZB84-B51 - ZENER D

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Product details

Overview

BZB84-B51,215 from Nexperia is a dual common-anode Zener diode in SOT23 package, designed for precision voltage regulation and overvoltage protection in compact DC power rails. It delivers nominal 5.1 V Zener voltage (±2 % tolerance), 480 Ω typical differential resistance at 5 mA, and supports non-repetitive peak reverse power dissipation up to 40 W for transient suppression in automotive ECUs and industrial sensor interfaces.

For engineers reviewing the BZB84-B51,215 datasheet, BZB84-B51,215 pinout, BZB84-B51,215 application, or BZB84-B51,215 equivalent, key selection criteria include Zener voltage accuracy, dual-diode common-anode topology for bidirectional clamping, thermal resistance (100 K/W junction-to-solder-point), AEC-Q101 qualification, and SOT23 footprint compatibility with high-density PCB layouts.

Technical Context

This dual Zener diode integrates two independent 5.1 V Zener elements sharing a common anode (Pin 3), enabling symmetrical clamping of positive and negative transients across a single node. Its ±2 % voltage tolerance and −2.7 to +1.2 mV/K temperature coefficient ensure stable regulation from −55 °C to +150 °C ambient.

The device operates within 300 mW total power dissipation at Tamb ≤25 °C and withstands 40 W non-repetitive surge pulses (tp = 100 µs, square wave) - critical for ISO 7637-2 load-dump and ESD immunity in automotive 12 V systems.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	5.00 V to 5.20 V at I_Z = 5 mA - ensures tight regulation for reference and clamp circuits
Differential Resistance (r_dif)	480 Ω max at I_Z = 5 mA - low impedance maintains stable voltage under varying load current
Reverse Current (I_R)	2 µA max at V_R = 3.0 V - minimal leakage preserves battery life in always-on modules
Forward Voltage (V_F)	0.9 V max at I_F = 10 mA - enables low-loss forward conduction during polarity reversal events
Non-repetitive Peak Power (P_ZSM)	40 W at t_p = 100 µs - handles automotive load-dump surges without failure
Junction Temperature (T_j)	150 °C max - supports operation in under-hood environments and sealed enclosures
AEC-Q101 Qualified	Yes - validated for automotive-grade reliability per stress test requirements

Pinout & Package

SOT23 (TO-236AB) plastic surface-mount package: 3-pin, small-outline transistor outline with standard 0.95 mm pitch; optimized for reflow soldering on FR4 PCBs with single-sided copper.

Pin/Terminal	Circuit Role	Design Meaning
1	Cathode (Diode 1)	Connects to regulated node for 5.1 V clamping in positive direction
2	Cathode (Diode 2)	Enables symmetrical negative-direction clamping when referenced to common anode
3	Common Anode	Shared anode terminal - ties both Zeners to system ground or bias rail

Key Features

Feature	Design Value
Dual common-anode configuration	Enables bidirectional voltage clamping using one component instead of two discrete Zeners
±2 % Zener voltage tolerance (B-series)	Reduces calibration overhead in precision reference designs versus ±5 % C-series variants
AEC-Q101 qualification	Validates robustness for automotive powertrain, body control, and ADAS modules
40 W non-repetitive peak power rating	Meets ISO 7637-2 Pulse 5a (load dump) immunity without external TVS supplementation
100 K/W junction-to-solder-point thermal resistance	Supports reliable heat transfer to PCB copper, enabling sustained 300 mW operation in confined spaces

Applications

Automotive Body Control Module (BCM)

Industrial Sensor Signal Conditioning

Use Scenario: Protecting LIN bus transceiver inputs from battery voltage spikes during ignition and load dump.

IC Role / Device Role / Timing Role: Dual-Zener clamps bidirectionally between LIN line and ground, limiting voltage to ±5.1 V.

Use Value: Eliminates need for separate forward/reverse protection diodes while maintaining AEC-Q101 compliance and SOT23 footprint.

Use Scenario: Stabilizing 5 V supply rail for analog front-end ICs in 4–20 mA loop-powered sensors.

IC Role / Device Role / Timing Role: Provides low-drift voltage reference and overvoltage shutdown threshold via Zener breakdown detection.

Use Value: ±2 % tolerance and −2.7 to +1.2 mV/K tempco enable <1 % total error across −40 °C to +125 °C operating range.

USB-C Power Delivery Interface

Smart Meter Voltage Monitoring

Use Scenario: Clamping CC1/CC2 pin voltages against ESD and hot-plug transients in USB-C receptacles.

IC Role / Device Role / Timing Role: Fast-response dual Zener absorbs ±8 kV HBM ESD events before damage occurs to PD controller.

Use Value: 40 W peak power rating and 300 mW steady-state dissipation allow direct placement at connector with no series resistor.

Use Scenario: Monitoring 230 V AC mains-derived DC rails in utility meters with isolated feedback.

IC Role / Device Role / Timing Role: Acts as precision overvoltage detector triggering MCU reset or relay cutoff at 5.1 V threshold.

Use Value: 2 µA max reverse leakage at 3 V ensures negligible current draw on high-impedance divider networks.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZB84-C51,215	±5 % Zener tolerance (vs. ±2 %); otherwise identical package, pinout, and surge rating	Acceptable where cost sensitivity outweighs voltage accuracy requirements	Select for non-critical biasing or general-purpose clamping where tighter regulation is unnecessary
MMBZ5251BS-7-F	Single Zener in SOT323; 5.1 V ±5 %; 200 mW P_tot; no dual configuration	Requires two devices for bidirectional clamping; lower surge capability (25 W)	Use only when board space allows dual placement and AEC-Q101 is not required

Compared with BZB84-C51,215, the BZB84-B51,215 offers tighter voltage control essential for reference circuits, while MMBZ5251BS-7-F lacks integrated dual topology and automotive qualification - making BZB84-B51,215 the sole choice for space-constrained, AEC-Q101-compliant bidirectional protection.

Availability

BZB84-B51,215 is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, and USB-C power delivery systems requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for BZB84-B51,215 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 logic, analog, and discrete components - delivering scalable solutions for automotive, industrial, and consumer markets.

The BZB84 series belongs to Nexperia's AEC-Q101-qualified Zener portfolio, engineered specifically for robust voltage regulation and transient suppression in harsh-environment electronics where space, reliability, and qualification are critical.

FAQ

What is the maximum continuous power dissipation for BZB84-B51,215?

The BZB84-B51,215 has a total power dissipation limit of 300 mW at ambient temperatures ≤25 °C. Derating is required above this temperature per the thermal resistance specification (R_th(j-a) = 417 K/W), and operation must remain within the absolute maximum junction temperature of 150 °C.

How does the dual common-anode configuration function in circuit design?

With Pin 3 as the shared anode, Pins 1 and 2 serve as independent cathodes - allowing one diode to clamp positive excursions (Pin 1 → Pin 3) and the other to clamp negative excursions (Pin 3 → Pin 2). This enables symmetrical ±5.1 V clamping across a single signal line referenced to ground or bias rail.

Is BZB84-B51,215 suitable for ISO 7637-2 Pulse 5a compliance testing?

Yes - its 40 W non-repetitive peak reverse power dissipation (tested at t_p = 100 µs, square wave, T_j = 25 °C) meets the energy requirement of ISO 7637-2 Pulse 5a (load dump), provided PCB layout provides adequate copper area for thermal dissipation and the device is placed close to the protected node.

What marking code identifies BZB84-B51,215 on the SOT23 package?

The marking code for BZB84-B51,215 is "RE*", where "*" denotes manufacturing location: "-" = Hong Kong, "p" = Hong Kong, "t" = Malaysia, "W" = China. This matches Table 4 in the Nexperia datasheet Rev. 03.

BZB84-B51,215 Specifications

Product attributes: Attribute value

Manufacturer:: NXP Semiconductors

Series:: -

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

Packaging:: Bulk

Product Status:: Active

Configuration:: 1 Pair Common Anode

Voltage - Zener (Nom) (Vz):: 51 V

Tolerance:: ±2%

Power - Max:: 300 mW

Impedance (Max) (Zzt):: 180 Ohms

Current - Reverse Leakage @ Vr:: 50 nA @ 35.7 V

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

Operating Temperature:: -

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23

BZB84-B51,215 FAQ

1.How can I place an order for BZB84-B51,215 through Aetrix?

Please submit a Request for Quotation (RFQ) for BZB84-B51,215 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 BZB84-B51,215 reliable?

The price and inventory of BZB84-B51,215 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZB84-B51,215 is usually 5 days.

3.What payment methods are accepted for BZB84-B51,215?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZB84-B51,215 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZB84-B51,215?

BZB84-B51,215 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZB84-B51,215 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 BZB84-B51,215?

For technical support, including BZB84-B51,215 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZB84-B51,215 requirements.

6.How does Aetrix verify that BZB84-B51,215 is sourced from the original manufacturer or authorized distributors?

All BZB84-B51,215 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 BZB84-B51,215 meets industry standards.

7.What is the process for return or replacement of BZB84-B51,215?

All BZB84-B51,215 units undergo pre-shipment inspection (PSI). If there is an issue with BZB84-B51,215, 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 BZB84-B51,215 part is unused and in its original packaging.

Return procedure for BZB84-B51,215:

1.Submit a request within 90 days.

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

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