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Nexperia USA Inc. BZB784-C3V3-QX
- Part No.:
- BZB784-C3V3-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Zener Diode Arrays
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZB784-C3V3-QX.pdf
- Description:
- BZB784-C3V3-Q/SOT323/SC-70
- Quantity:
- Payment:
- Shipping:
Inventory:6,269
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Product details
Overview
BZB784-C3V3-QX from Nexperia is a dual Zener voltage regulator diode in SOT323 (SC-70) package, configured as two cathodes sharing a common anode, with nominal Zener voltage 3.3 V ±5%, 5 µA reverse current at VR = 3.1 V, and 350 mW total power dissipation. It serves as a compact, AEC-Q101-qualified voltage reference and ESD protection element in automotive sensor interfaces and low-power supply rails.
For engineers reviewing the BZB784-C3V3-QX datasheet, BZB784-C3V3-QX pinout, BZB784-C3V3-QX application, or BZB784-C3V3-QX equivalent, this device requires attention to its dual-cathode topology, thermal derating on FR4 PCBs, junction-to-ambient resistance of 355 K/W (both diodes active), and non-repetitive surge capability up to 40 W for 100 µs.
Technical Context
This double Zener diode integrates two independent regulation elements sharing a common anode terminal, enabling bidirectional clamping or dual-rail referencing without external interconnection. Its 3.3 V nominal Zener voltage exhibits −1.8 mV/K temperature coefficient at IZ = 5 mA and 85 Ω typical differential resistance.
The device operates within −55 °C to +150 °C ambient range, supports 200 mA forward current per diode, and delivers 450 pF capacitance at 1 MHz under zero bias - critical for high-frequency transient suppression in CAN/LIN bus nodes and automotive microcontroller I/O protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.1 V to 3.5 V at IZ = 5 mA; ensures stable 3.3 V reference with ±5% tolerance across production lot |
| Reverse Current (IR) | 5 µA at VR = 3.1 V; defines low-leakage behavior essential for battery-backed circuits |
| Total Power Dissipation | 350 mW at Tamb = 25 °C (both diodes loaded); sets maximum continuous DC load in compact SOT323 footprint |
| Differential Resistance | 350 Ω max at IZ = 5 mA; determines regulation stiffness and output impedance in feedback paths |
| Thermal Resistance (Rth(j-a)) | 355 K/W in free air (2 diodes loaded); governs junction temperature rise under sustained regulation load |
| Non-repetitive Peak Power | 40 W for tp = 100 µs; enables robust ESD immunity per IEC 61000-4-2 Level 4 (±15 kV air) |
| Forward Voltage (VF) | 0.9 V max at IF = 10 mA; defines conduction loss during forward-biased clamping events |
Pinout & Package
Package: SOT323 (SC-70), 3-lead surface-mount plastic package, 2.0 mm × 1.25 mm × 0.95 mm body, 1.3 mm lead pitch, FR4-compatible footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (K1) | Cathode of Diode 1 | Connects to regulated node or signal line requiring 3.3 V clamping in negative direction |
| 2 (K2) | Cathode of Diode 2 | Enables independent connection to second rail or bidirectional clamp configuration |
| 3 (CA) | Common Anode | Anode tie-point for both Zeners; referenced to system ground or positive rail depending on biasing |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive underhood and cabin applications per stress test requirements including HTGB, HTRB, and temperature cycling |
| 5% Zener voltage tolerance | Reduces need for post-production trimming in precision reference designs targeting 3.3 V supply monitoring |
| Common-anode dual-diode topology | Eliminates external wiring between anodes, saving PCB area and parasitic inductance in high-speed ESD paths |
| Low 450 pF capacitance at 1 MHz | Maintains signal integrity on data lines up to 10 Mbps (e.g., LIN bus) without excessive edge degradation |
| 40 W non-repetitive surge rating | Withstands single-event transients exceeding ISO 7637-2 Pulse 1/2/5a without degradation when properly decoupled |
Applications
| Automotive Sensor Interface | LIN Bus Transceiver Protection |
|---|---|
|
Use Scenario: Voltage clamping and reference stabilization for analog outputs of pressure, temperature, and position sensors in engine control modules. IC Role / Device Role / Timing Role: Dual Zener provides bidirectional overvoltage protection and precise 3.3 V reference for ADC input scaling and fault detection thresholds. Use Value: Enables direct interface to 3.3 V microcontrollers without level-shifting, while maintaining AEC-Q101 reliability under thermal cycling and vibration. |
Use Scenario: ESD and load-dump protection on LIN physical layer transceivers operating at 19.2 kbps. IC Role / Device Role / Timing Role: Common-anode configuration clamps both dominant and recessive bus states to safe voltage windows relative to ground. Use Value: Limits bus voltage excursions to < ±3.5 V during fast transients, preserving signal eye diagram integrity and meeting ISO 17987-4 immunity requirements. |
| Infotainment System I/O Protection | Body Control Module Power Monitoring |
|
Use Scenario: Input protection for USB-C CC logic, touch controller GPIOs, and display backlight dimming signals in dashboard units. IC Role / Device Role / Timing Role: Acts as low-capacitance shunt clamp on low-voltage digital lines, absorbing ESD pulses before reaching sensitive CMOS inputs. Use Value: Delivers 15 kV air-gap ESD immunity per IEC 61000-4-2 with < 1 ns response time, avoiding latch-up in 28 nm process ICs. |
Use Scenario: Monitoring of 12 V battery rail via resistive divider into MCU ADC, requiring stable reference and overvoltage safeguard. IC Role / Device Role / Timing Role: Provides 3.3 V Zener reference for ADC reference buffer and clamps divider output against load dump spikes. Use Value: Ensures accurate battery state-of-charge reporting across −40 °C to +125 °C ambient, with no calibration drift due to Zener tempco compensation. |
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 |
|---|---|---|---|
| DMN3026LSD-13 | Single N-channel MOSFET with integrated Zener (30 V VDS, 2.6 A ID); no dual-cathode structure or 3.3 V regulation | Designed for load switch protection, not precision clamping or reference generation | Select only if replacing discrete FET+Zener combo where gate drive and overvoltage cutoff are primary goals |
| BZX84-C3V3,115 | Single 3.3 V Zener in SOT23; lacks second cathode and common-anode topology | Requires two devices and external anode tie for dual-rail use, increasing board area and parasitic inductance | Choose when space allows discrete placement and thermal management of two separate packages is acceptable |
Compared with BZX84-C3V3,115, the BZB784-C3V3-QX reduces component count and layout complexity for bidirectional clamping, while DMN3026LSD-13 serves a fundamentally different power-switching function with no Zener regulation capability.
Availability
BZB784-C3V3-QX is available at Aetrix Electronics and suitable for automotive sensor interfaces, LIN bus protection, infotainment I/O safeguarding, and body control module power monitoring requiring stable component supply across extended temperature ranges and AEC-Q101 compliance.
Supply support for BZB784-C3V3-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 specializing in high-volume, high-reliability discrete and logic devices, with core expertise in automotive-grade components and advanced packaging.
The BZB784-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode portfolio, engineered specifically for voltage regulation and transient protection in harsh automotive environments where space, thermal performance, and long-term stability are critical.
FAQ
What is the maximum continuous forward current per cathode?
The BZB784-C3V3-QX supports 200 mA forward current per diode under limiting conditions, but continuous operation should be limited to 100 mA per cathode to maintain junction temperature below 150 °C on standard FR4 PCBs with single-sided copper. Derating is required above 25 °C ambient per Rth(j-a) = 355 K/W.
Can this device replace two separate Zener diodes in a common-cathode configuration?
No - the BZB784-C3V3-QX has a common anode (CA), not common cathode. It is designed for configurations where both cathodes connect to separate nodes and the anode ties to a shared reference (e.g., ground). For common-cathode use, two discrete Zeners like BZX84-C3V3 would be required.
Is the 3.3 V Zener voltage specified at DC or pulsed conditions?
The 3.3 V nominal Zener voltage is specified at DC test condition IZ = 5 mA and Tj = 25 °C, per Table 8. The device maintains regulation within ±5% tolerance under steady-state DC loads up to 100 mA, with temperature coefficient of −1.8 mV/K measured at the same DC current.
Does the 40 W surge rating apply to each diode or the entire package?
The 40 W non-repetitive peak reverse power dissipation applies to the entire package under tp = 100 µs square-wave surge, with both diodes conducting simultaneously. This rating assumes prior thermal equilibrium at Tamb = 25 °C and is validated per IEC 61000-4-5 waveform testing protocols.
BZB784-C3V3-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):
- 3.3 V
- Tolerance:
- ±5%
- Power - Max:
- 180 mW
- Impedance (Max) (Zzt):
- 95 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 1 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-C3V3-QX FAQ
1.How can I place an order for BZB784-C3V3-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZB784-C3V3-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-C3V3-QX reliable?
The price and inventory of BZB784-C3V3-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-C3V3-QX is usually 5 days.
3.What payment methods are accepted for BZB784-C3V3-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZB784-C3V3-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZB784-C3V3-QX?
BZB784-C3V3-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZB784-C3V3-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-C3V3-QX?
For technical support, including BZB784-C3V3-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZB784-C3V3-QX requirements.
6.How does Aetrix verify that BZB784-C3V3-QX is sourced from the original manufacturer or authorized distributors?
All BZB784-C3V3-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-C3V3-QX meets industry standards.
7.What is the process for return or replacement of BZB784-C3V3-QX?
All BZB784-C3V3-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZB784-C3V3-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-C3V3-QX part is unused and in its original packaging.
Return procedure for BZB784-C3V3-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZB784-C3V3-QX Tags
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