My Inquiry
My Account
Nexperia USA Inc. BZB784-C3V9-QX
- Part No.:
- BZB784-C3V9-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Zener Diode Arrays
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZB784-C3V9-QX.pdf
- Description:
- BZB784-C3V9-Q/SOT323/SC-70
- Quantity:
- Payment:
- Shipping:
Inventory:2,516
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BZB784-C3V9-QX from Nexperia is a dual Zener voltage regulator diode in SOT323 (SC-70) package, configured with common anode and two independent cathodes for bidirectional regulation or dual-rail clamping. It delivers 3.9 V nominal Zener voltage (±5%), 3 µA reverse leakage at VR = 1 V, 400 Ω typical differential resistance at IZ = 5 mA, and is AEC-Q101 qualified for automotive power rail stabilization and ESD protection.
For engineers reviewing the BZB784-C3V9-QX datasheet, BZB784-C3V9-QX pinout, BZB784-C3V9-QX application, or BZB784-C3V9-QX equivalent, this device supports dual-voltage reference generation, low-power rail clamping, and transient suppression in space-constrained automotive ECUs and sensor interfaces where thermal resistance to solder point (Rth(j-sp) = 140 K/W, 2 diodes loaded) and tight VZ tolerance are critical selection criteria.
Technical Context
This dual-Zener diode integrates two independently rated Zener junctions sharing a common anode terminal, enabling symmetrical clamping across a single reference node or asymmetric regulation using separate cathodes. Its 3.9 V working voltage is specified at IZ = 5 mA with ±5% tolerance and −1.9 mV/K temperature coefficient.
Designed for automotive-grade reliability, it sustains non-repetitive peak reverse power up to 40 W (tp = 100 µs), operates over −55 °C to +150 °C ambient, and achieves 355 K/W junction-to-ambient thermal resistance in free air with both diodes active.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.7 V to 4.1 V at IZ = 5 mA - defines precise clamping threshold for 3.3 V system rails |
| Reverse Leakage (IR) | 3 µA at VR = 1 V - ensures minimal standby current in always-on automotive modules |
| Differential Resistance (rdiff) | 400 Ω typical at IZ = 5 mA - determines regulation stiffness under dynamic load transients |
| Power Dissipation (Ptot) | 350 mW max at Tamb = 25 °C (2 diodes loaded) - sets continuous clamp duty cycle limit on FR4 PCB |
| Thermal Resistance (Rth(j-sp)) | 140 K/W (2 diodes loaded) - enables direct thermal coupling to PCB copper for surge energy dissipation |
| Peak Surge Power (PZSM) | 40 W for 100 µs square wave - supports ISO 7637-2 pulse 1/2/5a transient suppression |
| ESD Rating | AEC-Q101 qualified - certified for automotive subsystems requiring robustness against human-body-model discharges |
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 | Provides dedicated connection for first Zener junction; used for unidirectional clamping or reference output |
| 2 (K2) | Cathode of Diode 2 | Enables independent control of second Zener path; allows dual-threshold or bidirectional voltage limiting |
| 3 (CA) | Common Anode | Serves as shared return node; simplifies PCB layout by eliminating need for two discrete anode traces |
Key Features
| Feature | Design Value |
|---|---|
| Dual-Zener topology with common anode | Reduces component count vs. two discrete Zeners while maintaining independent cathode routing for flexible biasing |
| ±5% VZ tolerance at IZ = 5 mA | Ensures predictable clamping accuracy without post-production trimming in cost-sensitive automotive modules |
| AEC-Q101 qualification | Validates reliability for under-hood applications including engine control, lighting, and ADAS sensor interfaces |
| Low 3 µA IR at VR = 1 V | Minimizes quiescent current draw in battery-backed systems such as CAN wake-up receivers and LIN transceivers |
| 40 W non-repetitive surge capability | Withstands automotive load-dump and inductive switching transients without degradation when properly heatsinked |
Applications
| Automotive Body Control Module (BCM) | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Clamping 3.3 V I²C bus lines against ESD events and supply rail overshoot during ignition cycling. IC Role / Device Role / Timing Role: Dual-rail transient voltage suppressor protecting microcontroller GPIO and level-shifter inputs. Use Value: Prevents latch-up and data corruption by limiting voltage excursions to ≤4.1 V with <3 µA leakage at idle. |
Use Scenario: Stabilizing reference voltage for 12-bit ADC front-end in 4–20 mA loop-powered transmitters. IC Role / Device Role / Timing Role: Precision shunt reference providing stable 3.9 V node for ratiometric sensor excitation. Use Value: Delivers ±5% initial accuracy and −1.9 mV/K drift, enabling <0.5% total error over −40 °C to +85 °C. |
| Automotive Camera Module Power Rail | USB-C Port Overvoltage Protection |
Use Scenario: Regulating auxiliary 3.3 V supply for image sensor and ISP in ADAS forward-facing camera. IC Role / Device Role / Timing Role: Low-noise voltage clamp preventing brown-out during cold-crank and load-dump surges. Use Value: Maintains regulated output with 400 Ω rdiff and 350 mW Ptot, ensuring uninterrupted operation during 100 ms transients. |
Use Scenario: Protecting USB-C CC logic pins from accidental 5 V or 9 V adapter misconnection. IC Role / Device Role / Timing Role: Bidirectional overvoltage limiter using K1 and K2 to clamp both CC1 and CC2 lines to 3.9 V. Use Value: Leverages common-anode architecture to protect dual CC pins with single-component footprint and matched VZ tracking. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5226BS-7-F | Single Zener (3.3 V), SOT-363 package, no common-anode dual configuration | Lacks integrated dual-cathode functionality; requires two devices for equivalent circuit | Select only if discrete placement and routing flexibility outweigh board-area savings |
| BZX84-C3V9,215 | Single Zener (3.9 V), SOT-23 package, higher 10 µA IR at VR = 1 V | Higher leakage increases standby power; not AEC-Q101 qualified | Acceptable for non-automotive industrial use where qualification and leakage are non-critical |
Compared with MMBZ5226BS-7-F and BZX84-C3V9,215, the BZB784-C3V9-QX uniquely provides matched dual-Zener regulation in one AEC-Q101-qualified SC-70 package, reducing PCB area by 40% and leakage by 67% versus the BZX84 alternative-critical for compact, low-power automotive nodes.
Availability
BZB784-C3V9-QX is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor signal conditioning, and USB-C port protection requiring stable component supply with guaranteed AEC-Q101 compliance and traceable lot-level documentation.
Supply support for BZB784-C3V9-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 essential semiconductors for automotive, industrial, and consumer markets.
The BZB784-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode portfolio, engineered specifically for automotive power rail stabilization, ESD protection, and precision voltage reference in space-constrained ECUs and sensor nodes.
FAQ
What is the maximum continuous power dissipation for BZB784-C3V9-QX on a standard FR4 PCB?
The maximum total power dissipation is 350 mW at Tamb = 25 °C with both diodes loaded on a single-sided, tin-plated FR4 PCB using the standard footprint. Derating is required above 25 °C ambient per the Rth(j-a) = 355 K/W thermal resistance value.
Can BZB784-C3V9-QX be used for bidirectional clamping on a single signal line?
Yes - by connecting the common anode (pin 3) to the signal line and routing cathodes K1 and K2 to opposing supply rails (e.g., GND and 3.3 V), it forms a symmetric ±3.9 V clamp. This configuration leverages its matched VZ tolerance and low rdiff for balanced transient suppression.
Is the 3.9 V Zener voltage specified at a particular test current?
Yes - the nominal 3.9 V Zener voltage is specified at IZ = 5 mA, with a guaranteed range of 3.7 V to 4.1 V (±5%). The differential resistance of 400 Ω is also measured at this same 5 mA condition, defining regulation slope near the operating point.
Does BZB784-C3V9-QX require external current-limiting resistors in all applications?
Yes - like all Zener diodes, it requires a series current-limiting resistor to set the operating IZ and prevent thermal runaway. For 3.9 V regulation at 5 mA from a 12 V rail, a 1.6 kΩ resistor is typical; exact value depends on supply variation, load current, and desired regulation margin.
BZB784-C3V9-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):
- 3.9 V
- Tolerance:
- ±5%
- Power - Max:
- 180 mW
- Impedance (Max) (Zzt):
- 90 Ohms
- Current - Reverse Leakage @ Vr:
- 3 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-C3V9-QX FAQ
1.How can I place an order for BZB784-C3V9-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZB784-C3V9-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-C3V9-QX reliable?
The price and inventory of BZB784-C3V9-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-C3V9-QX is usually 5 days.
3.What payment methods are accepted for BZB784-C3V9-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZB784-C3V9-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZB784-C3V9-QX?
BZB784-C3V9-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZB784-C3V9-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-C3V9-QX?
For technical support, including BZB784-C3V9-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZB784-C3V9-QX requirements.
6.How does Aetrix verify that BZB784-C3V9-QX is sourced from the original manufacturer or authorized distributors?
All BZB784-C3V9-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-C3V9-QX meets industry standards.
7.What is the process for return or replacement of BZB784-C3V9-QX?
All BZB784-C3V9-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZB784-C3V9-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-C3V9-QX part is unused and in its original packaging.
Return procedure for BZB784-C3V9-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZB784-C3V9-QX Tags
-
MMBZ18VALT1G
onsemi
-
AZ23C18-7-F
Diodes Incorporated
-
MMBZ6V2ALT1G
onsemi
-
MMBZ5V6ALT1G
onsemi
-
MMBZ6V8ALT1G
onsemi
-
MMBZ5V6ALT3G
onsemi
-
MMBZ33VALT1G
onsemi
-
MMBZ9V1ALT1G
onsemi
-
MMBZ20VALT1G
onsemi
-
SZMMBZ27VALT1G
onsemi
-
MMBZ15VALT1G
onsemi
-
MMBZ12VALT1G
onsemi
Tech Hub
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…
Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…
A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…
Engineering guide to Raspberry Pi alternatives, covering chip-level differences, Orange Pi, ROCK, Jetson, Banana Pi, NanoPi, Compute Module, Pico, GPIO, camera, HAT compatibility, and replacement risks…
