My Inquiry
My Account
Nexperia USA Inc. BZB84-B68-QR
- Part No.:
- BZB84-B68-QR
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Zener Diode Arrays
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZB84-B68-QR.pdf
- Description:
- BZB84-B68-Q/SOT23/TO-236AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,489
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BZB84-B68-QR from Nexperia is a dual common-anode Zener diode pair in SOT23 package, rated for 68 V nominal Zener voltage (±2 % tolerance), 300 mW total power dissipation, and qualified to AEC-Q101 for automotive voltage regulation. It delivers stable reference voltage in compact space-constrained circuits such as ECU power rail clamping and sensor biasing.
For engineers reviewing the BZB84-B68-QR datasheet, BZB84-B68-QR pinout, BZB84-B68-QR application, or BZB84-B68-QR equivalent, key selection criteria include its dual-Zener topology with shared anode, ±2 % voltage tolerance at 5 mA test current, 80 Ω typical differential resistance, and automotive-grade reliability under -55 °C to +150 °C ambient operation.
Technical Context
This dual Zener diode integrates two independent 68 V Zener elements sharing a common anode terminal (Pin 3), enabling bidirectional voltage clamping or dual-rail reference generation from a single footprint. Its design supports low-current precision regulation with 2 μA maximum reverse leakage at 54.4 V (0.8 × VZ) and 0.9 V forward voltage at 10 mA.
The device operates within a junction temperature range of -55 °C to +150 °C and exhibits a positive temperature coefficient of +4.76 mV/K at IZ = 2 mA, ensuring predictable drift behavior in thermally varying automotive environments. Thermal resistance from junction to solder point is 100 K/W, supporting reliable power handling on standard FR4 PCBs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 66.6 V to 69.4 V at IZ = 2 mA - tight ±2 % tolerance enables accurate voltage reference without external trimming |
| Differential Resistance rdif | 475 Ω max at IZ = 2 mA - low dynamic impedance ensures stable regulation under varying load currents |
| Reverse Current IR | 0.05 μA max at VR = 54.4 V - minimal leakage preserves battery-backed circuit integrity |
| Total Power Dissipation Ptot | 300 mW at Tamb ≤ 25 °C - sufficient headroom for transient suppression in 12 V/24 V automotive systems |
| Non-repetitive Peak Reverse Power | 40 W at tp = 100 μs - robust surge immunity against load-dump transients per ISO 7637-2 |
| Thermal Resistance Rth(j-sp) | 100 K/W - enables direct thermal coupling to PCB copper for effective heat dissipation |
| AEC-Q101 Qualified | Qualified for automotive applications - meets stress test requirements for humidity, temperature cycling, and HTRB |
Pinout & Package
SOT23 plastic surface-mount package: 2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm lead pitch, 3-terminal configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | K1 (Cathode 1) | Anode-referenced 68 V Zener cathode; connects to regulated node requiring clamping or reference |
| 2 | K2 (Cathode 2) | Independent 68 V Zener cathode; enables dual-rail or complementary regulation paths |
| 3 | CA (Common Anode) | Shared anode connection; simplifies PCB layout by eliminating separate anode traces for both diodes |
Key Features
| Feature | Design Value |
|---|---|
| Dual common-anode topology | Reduces component count and board area vs. discrete dual-Zener solutions while maintaining independent cathode control |
| ±2 % Zener voltage tolerance | Eliminates need for post-assembly calibration in precision reference designs such as ADC voltage references |
| AEC-Q101 qualification | Validated for under-hood automotive use including engine control units and ADAS power supplies |
| Low 0.9 V forward voltage | Minimizes conduction loss during forward-biased operation in protection circuits or level-shifting applications |
| 40 W non-repetitive surge rating | Withstands ISO 7637-2 Pulse 5a load-dump events without degradation when used with appropriate series impedance |
Applications
| Automotive ECU Power Rail Clamping | Industrial Sensor Bias Reference |
|---|---|
Use Scenario: Protecting microcontroller I/O rails in engine control modules against load-dump transients up to 40 V. IC Role / Device Role / Timing Role: Dual-Zener clamping device providing symmetrical overvoltage protection on VDD and VREF lines. Use Value: Shared anode reduces trace inductance and improves transient response versus discrete diodes; 40 W surge rating handles ISO 7637-2 Pulse 5a without derating. |
Use Scenario: Generating stable 68 V bias for high-side current sensing in motor drive feedback loops. IC Role / Device Role / Timing Role: Precision voltage reference source with ±2 % tolerance and low tempco (4.76 mV/K) for analog front-end conditioning. Use Value: Tight tolerance eliminates need for trimming resistors; dual cathodes allow simultaneous reference and clamp functions in compact space. |
| Automotive Lighting Driver Protection | Telecom DC-DC Feedback Divider |
Use Scenario: Overvoltage protection for LED driver ICs in headlamp modules exposed to battery voltage spikes. IC Role / Device Role / Timing Role: Fast-acting Zener clamp limiting input voltage to driver IC during cold-crank or alternator regulation faults. Use Value: 100 μs surge capability matches typical fault duration; SOT23 footprint fits tight thermal zones near power FETs. |
Use Scenario: Providing precise 68 V reference for optocoupler-based feedback in isolated 48 V telecom DC-DC converters. IC Role / Device Role / Timing Role: Secondary-side voltage reference stabilizing output regulation accuracy across line/load variations. Use Value: Low 0.05 μA leakage at 54.4 V prevents feedback divider current error; AEC-Q101 qualification supports extended product lifecycle. |
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 |
|---|---|---|---|
| BZB84-C68-Q | ±5 % Zener tolerance (vs. ±2 %); otherwise identical package, pinout, and surge rating | Acceptable where cost sensitivity outweighs precision requirement, e.g., non-critical power sequencing | Select for cost-driven industrial designs where 68 V ±3.4 V variation is acceptable |
| MMBZ5268B | Single Zener (not dual), SOT23, 68 V ±5 %, 350 mW Ptot, no AEC-Q101 qualification | Lacks dual-cathode functionality and automotive qualification; suitable only for commercial-grade applications | Choose only for non-automotive prototypes or legacy designs lacking dual-Zener requirement |
Compared with BZB84-C68-Q, the BZB84-B68-QR offers tighter voltage control critical for reference accuracy; versus MMBZ5268B, it provides dual-Zener integration and automotive qualification essential for ECU and ADAS deployments.
Availability
BZB84-B68-QR is available at Aetrix Electronics and suitable for automotive ECU protection, industrial sensor biasing, LED driver clamping, and telecom DC-DC feedback requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for BZB84-B68-QR 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 devices, with leadership in automotive-qualified components.
The BZB84-Q series belongs to Nexperia's automotive Zener diode portfolio, engineered specifically for robust voltage regulation and transient suppression in harsh-temperature vehicle subsystems.
FAQ
What is the maximum continuous reverse current rating for BZB84-B68-QR?
The device has no specified continuous reverse current rating; its operation relies on controlled Zener current (IZ). The absolute maximum Zener current is derived from Ptot = 300 mW and VZ ≈ 68 V, yielding ~4.4 mA maximum steady-state IZ. Exceeding this risks thermal runaway due to positive temperature coefficient.
Can BZB84-B68-QR be used in parallel for higher power handling?
No - parallel connection of Zener diodes is not recommended due to mismatched VZ and temperature coefficients causing current hogging. For higher power, use a single higher-rated device or external series resistors with forced air cooling, respecting the 300 mW limit per device.
How does the common-anode configuration affect PCB layout compared to dual discrete Zeners?
The common-anode pin (Pin 3) eliminates the need for separate anode traces and vias, reducing parasitic inductance and layout complexity. It enables symmetric placement relative to regulated nodes and simplifies thermal coupling to a shared copper pour, improving surge dissipation uniformity.
Is the 40 W non-repetitive peak power rating applicable to both diodes simultaneously?
Yes - the 40 W rating applies per diode, meaning each Zener element (K1–CA and K2–CA) can independently withstand 40 W for 100 μs. Simultaneous surges on both cathodes are supported provided total device power remains within 300 mW average limits and thermal design accommodates cumulative heating.
BZB84-B68-QR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZB84-Q
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Configuration:
- 1 Pair Common Anode
- Voltage - Zener (Nom) (Vz):
- 68 V
- Tolerance:
- ±2%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 240 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 47.6 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:
- TO-236AB
BZB84-B68-QR FAQ
1.How can I place an order for BZB84-B68-QR through Aetrix?
Please submit a Request for Quotation (RFQ) for BZB84-B68-QR 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-B68-QR reliable?
The price and inventory of BZB84-B68-QR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZB84-B68-QR is usually 5 days.
3.What payment methods are accepted for BZB84-B68-QR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZB84-B68-QR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZB84-B68-QR?
BZB84-B68-QR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZB84-B68-QR 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-B68-QR?
For technical support, including BZB84-B68-QR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZB84-B68-QR requirements.
6.How does Aetrix verify that BZB84-B68-QR is sourced from the original manufacturer or authorized distributors?
All BZB84-B68-QR 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-B68-QR meets industry standards.
7.What is the process for return or replacement of BZB84-B68-QR?
All BZB84-B68-QR units undergo pre-shipment inspection (PSI). If there is an issue with BZB84-B68-QR, 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-B68-QR part is unused and in its original packaging.
Return procedure for BZB84-B68-QR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZB84-B68-QR 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
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…
Engineering guide to dynamic load response testing for high-current buck converters, covering load step setup, slew rate, Vcore undershoot, overshoot, recovery time, probe location, output capacitors a…
