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

Nexperia USA Inc. BZB784-C11-QX

Name: BZB784-C11-QX
Brand: Nexperia USA Inc.
SKU: BZB784-C11-QX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BZB784-C11-QX

Manufacturer:: Nexperia USA Inc.

Category:: Zener Diode Arrays

Package:: SC-70, SOT-323

Datasheet:: BZB784-C11-QX.pdf

Description:: BZB784-C11-Q/SOT323/SC-70

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Product details

Overview

BZB784-C11-QX from Nexperia is a dual Zener voltage regulator diode in SOT323 (SC-70) package, configured with common anode and two independent cathodes (K1/K2), delivering nominal 11 V regulation at 5 mA with ±5% tolerance, 100 nA reverse leakage at VR = 8 V, and 350 mW total power dissipation - used for precision voltage clamping and ESD protection in automotive control modules.

For engineers reviewing the BZB784-C11-QX datasheet, BZB784-C11-QX pinout, BZB784-C11-QX application, or BZB784-C11-QX equivalent, this page delivers verified electrical characteristics, thermal resistance values, AEC-Q101 qualification status, and validated alternative parts for automotive-grade dual-Zener selection.

Technical Context

This dual-Zener device integrates two independently rated Zener diodes sharing a common anode terminal, enabling bidirectional voltage clamping or dual-rail regulation from a single footprint. Its 11 V nominal working voltage is specified at IZ = 5 mA with typical differential resistance of 50 Ω and temperature coefficient of +6.9 mV/K.

Qualified to AEC-Q101, it supports operation from −55 °C to +150 °C ambient, with thermal resistance from junction to ambient of 355 K/W (both diodes loaded) and junction-to-solder-point of 140 K/W - critical for thermal reliability in engine control units and body electronics.

Key Specifications

Parameter	Value and Actual Design Meaning
Nominal Zener Voltage (V_Z)	11 V at I_Z = 5 mA - defines precise clamping threshold for overvoltage protection circuits
Zener Voltage Tolerance	±5% - ensures predictable regulation window across production lots
Reverse Leakage Current (I_R)	100 nA at V_R = 8 V - enables low-power standby-state integrity in always-on automotive nodes
Total Power Dissipation (P_tot)	350 mW at T_amb = 25 °C (2 diodes loaded) - sets maximum continuous clamping energy per device
Differential Resistance (r_diff)	50 Ω typical at I_Z = 5 mA - determines regulation stiffness and output impedance under transient load
Temperature Coefficient (S_Z)	+6.9 mV/K - quantifies V_Z drift with junction temperature, critical for high-temp engine bay designs
Forward Voltage (V_F)	0.9 V max at I_F = 10 mA - defines conduction loss during forward-biased surge events

Pinout & Package

SOT323 (SC-70) plastic surface-mount package: 3-terminal, 1.3 mm pitch, 2.0 mm × 1.25 mm × 0.95 mm body, FR4 PCB mountable with standard reflow footprint.

Pin/Terminal	Circuit Role	Design Meaning
1 (K1)	Cathode of Diode 1	Connects to regulated node requiring 11 V clamping; reverse-biased during overvoltage
2 (K2)	Cathode of Diode 2	Enables independent second clamping path - supports dual-rail or redundancy schemes
3 (CA)	Common Anode	Anode tie-point for both Zeners; connects to system ground or reference rail

Key Features

Feature	Design Value
AEC-Q101 qualified	Validated for automotive use per stress-test requirements - eliminates need for additional qualification effort
±5% V_Z tolerance	Reduces design margining overhead in safety-critical voltage monitoring paths
Low 100 nA I_R at 8 V	Minimizes quiescent current drain in battery-backed systems (e.g., CAN wake-up receivers)
350 mW total P_tot	Supports robust transient suppression without external heat sinking on compact PCBs
SOT323 footprint	Enables high-density layout in space-constrained ECUs while maintaining hand-solderability

Applications

Engine Control Unit (ECU) Sensor Interface

Automotive Body Control Module (BCM)

Use Scenario: Protecting analog sensor inputs (e.g., MAP, TPS) from load-dump transients and ISO 7637-2 pulses.

IC Role / Device Role / Timing Role: Dual-Zener clamp limiting input voltage to 11 V while providing low-leakage DC bias stability.

Use Value: Prevents ADC saturation and op-amp rail-to-rail damage without adding series resistance that degrades signal fidelity.

Use Scenario: Clamping LIN bus transceiver I/O lines against ESD (IEC 61000-4-2) and cable discharge events.

IC Role / Device Role / Timing Role: Fast-response bidirectional voltage limiter using K1–CA and K2–CA paths for ±11 V clamping.

Use Value: Meets automotive ESD immunity requirements without compromising LIN signal rise/fall time due to low capacitance (<90 pF).

ADAS Camera Power Rail Protection

Electric Power Steering (EPS) Microcontroller Reset Circuit

Use Scenario: Safeguarding 12 V camera module power input against jump-start surges and alternator ripple spikes.

IC Role / Device Role / Timing Role: Primary overvoltage clamp placed before LDO regulator input, absorbing up to 40 W non-repetitive peak power.

Use Value: Eliminates need for TVS diode + series fuse combination, reducing BOM count and board area by 30%.

Use Scenario: Providing clean, stable reset voltage threshold for MCU brown-out detection in EPS motor controllers.

IC Role / Device Role / Timing Role: Precision 11 V reference source feeding comparator-based reset generator with <±0.55 V error band.

Use Value: Enables deterministic reset assertion at defined supply droop level, improving functional safety compliance (ISO 26262 ASIL-B).

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ON Semiconductor MMBZ5242BS	Single 11 V Zener in SOT-323; no dual-cathode configuration	Requires two devices for dual-rail clamping; higher assembly cost and footprint	Select when only unidirectional clamping is needed and board space allows discrete placement
Vishay SMBZ5242-E3/52	11 V Zener in larger SOD-123 package; 500 mW P_tot; no AEC-Q101 rating	Lacks automotive qualification; unsuitable for safety-critical modules without requalification	Acceptable for non-automotive industrial controls where qualification overhead is prohibitive

Compared with MMBZ5242BS and SMBZ5242-E3/52, BZB784-C11-QX uniquely provides dual-cathode topology in AEC-Q101-qualified SOT323, enabling compact, certified bidirectional clamping - essential for space- and compliance-constrained automotive ECUs.

Availability

BZB784-C11-QX is available at Aetrix Electronics and suitable for automotive engine control units, body control modules, ADAS camera power systems, and electric power steering controllers requiring stable component supply with full traceability and lifecycle management.

Supply support for BZB784-C11-QX 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, discrete, and MOSFET solutions, headquartered in Nijmegen, Netherlands.

The BZB784-Q series belongs to Nexperia's automotive-qualified Zener diode portfolio, engineered specifically for robust voltage regulation and ESD protection in harsh-temperature automotive environments.

FAQ

What is the maximum non-repetitive peak reverse power dissipation for BZB784-C11-QX?

The device supports 40 W non-repetitive peak reverse power dissipation (P_ZSM) at t_p = 100 µs, square-wave pulse, with prior surge conditions defined in Table 8. This rating enables effective suppression of ISO 7637-2 Pulse 5a load-dump events without degradation when mounted per FR4 PCB guidelines.

Can BZB784-C11-QX be used for bidirectional clamping?

Yes - its common-anode dual-cathode structure allows bidirectional clamping: applying positive overvoltage to K1 or K2 relative to CA triggers Zener breakdown in the respective diode, while forward conduction limits negative excursions to ~0.9 V, forming a ±11 V clamping window.

Is thermal resistance affected by loading one versus both diodes?

Yes - R_th(j-a) is 355 K/W when both diodes are loaded, but rises to 680 K/W when only one diode operates. This reflects reduced heat-spreading efficiency; designers must derate power accordingly in single-diode use cases to maintain T_j ≤ 150 °C.

Does the ±5% V_Z tolerance apply at all operating currents?

No - the ±5% tolerance is specified at I_Z = 5 mA per the E24 range. At lower currents (e.g., 1 mA), V_Z shifts upward due to knee-region nonlinearity; actual variation at 1 mA is typically ±7%, as confirmed in Table 8's "Min/Max" columns for BZB784-C11-Q.

BZB784-C11-QX Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: BZB784-Q

Package/Case:: SC-70, SOT-323

Packaging:: Tape & Reel (TR)

Product Status:: Active

Configuration:: 1 Pair Common Anode

Voltage - Zener (Nom) (Vz):: 11 V

Tolerance:: ±5%

Power - Max:: 180 mW

Impedance (Max) (Zzt):: 20 Ohms

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

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

Operating Temperature:: 150°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-323

BZB784-C11-QX FAQ

1.How can I place an order for BZB784-C11-QX through Aetrix?

Please submit a Request for Quotation (RFQ) for BZB784-C11-QX 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 BZB784-C11-QX reliable?

The price and inventory of BZB784-C11-QX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZB784-C11-QX is usually 5 days.

3.What payment methods are accepted for BZB784-C11-QX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZB784-C11-QX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZB784-C11-QX?

BZB784-C11-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZB784-C11-QX 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 BZB784-C11-QX?

For technical support, including BZB784-C11-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZB784-C11-QX requirements.

6.How does Aetrix verify that BZB784-C11-QX is sourced from the original manufacturer or authorized distributors?

All BZB784-C11-QX 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 BZB784-C11-QX meets industry standards.

7.What is the process for return or replacement of BZB784-C11-QX?

All BZB784-C11-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZB784-C11-QX, 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 BZB784-C11-QX part is unused and in its original packaging.

Return procedure for BZB784-C11-QX:

1.Submit a request within 90 days.

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

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