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Nexperia USA Inc. BZB84-B18-QR
- Part No.:
- BZB84-B18-QR
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Zener Diode Arrays
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZB84-B18-QR.pdf
- Description:
- BZB84-B18-Q/SOT23/TO-236AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,826
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Product details
Overview
BZB84-B18-QR from Nexperia is a dual common-anode Zener diode in SOT23 package, providing precise 18 V voltage regulation with ±2 % tolerance, 225 Ω differential resistance at 5 mA, and AEC-Q101 qualification for automotive power rail stabilization and overvoltage clamping.
For engineers reviewing the BZB84-B18-QR datasheet, BZB84-B18-QR pinout, BZB84-B18-QR application, or BZB84-B18-QR equivalent, this page delivers verified Zener voltage, thermal resistance, non-repetitive surge capability, dual-diode configuration details, and automotive-grade reliability data required for ECU power management, sensor interface protection, and dual-rail reference design.
Technical Context
This dual-Zener device integrates two independent 18 V Zener junctions sharing a common anode (Pin 3), enabling compact dual-voltage reference or bidirectional clamping in a single SOT23 footprint. Its 150 °C maximum junction temperature and AEC-Q101 qualification confirm suitability for under-hood automotive environments.
The device exhibits a typical temperature coefficient of +12.4 mV/K at 5 mA and reverse current ≤0.05 μA at 14.4 V, supporting stable regulation across industrial temperature ranges. Non-repetitive peak reverse current is rated at 1.5 A for 100 μs pulses, with total device power dissipation limited to 300 mW at 25 °C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 17.6 V to 18.4 V at IZ = 5 mA - ensures tight 18 V regulation for precision reference applications |
| Differential Resistance rdif | 225 Ω max at IZ = 5 mA - low dynamic impedance maintains stable output under load transients |
| Reverse Current IR | ≤0.05 μA at VR = 14.4 V - minimal leakage preserves accuracy in high-impedance bias networks |
| Total Power Dissipation Ptot | 300 mW at Tamb ≤ 25 °C - defines continuous thermal budget on standard FR4 PCB |
| Non-repetitive Peak Reverse Current IZSM | 1.5 A for tp = 100 μs - supports transient overvoltage suppression without failure |
| Junction-to-Ambient Thermal Resistance Rth(j-a) | 417 K/W - quantifies self-heating impact during sustained conduction |
| AEC-Q101 Qualified | Yes - validated for automotive use including temperature cycling, humidity, and mechanical stress |
Pinout & Package
SOT23 plastic surface-mount package (2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm lead pitch) with gull-wing leads and standardized footprint per Figure 12 in Nexperia's datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | K1 (Cathode of Diode 1) | Provides regulated 18 V output node when referenced to common anode; connects to first protected rail |
| 2 | K2 (Cathode of Diode 2) | Provides second independent 18 V output node; enables dual-rail referencing or redundancy |
| 3 | CA (Common Anode) | Shared anode connection; ties both Zeners to system ground or negative supply rail |
Key Features
| Feature | Design Value |
|---|---|
| Dual common-anode Zener configuration | Enables space-efficient dual 18 V references or symmetrical clamping without discrete pairing |
| ±2 % Zener voltage tolerance (B-series) | Reduces calibration overhead in automotive sensor signal conditioning and ADC reference circuits |
| AEC-Q101 qualification | Validates reliability for engine control units, body electronics, and ADAS power domains |
| 40 W non-repetitive peak reverse power | Handles ISO 7637-2 pulse 1/2a/5a surges without degradation in 12 V vehicle systems |
| 150 °C maximum junction temperature | Supports operation in high-temperature zones such as near power converters or under-dash ECUs |
Applications
| Automotive Engine Control Unit (ECU) Power Rail Clamping | Industrial Sensor Signal Conditioning Reference |
|---|---|
Use Scenario: Protecting microcontroller I/O and analog front-end inputs from load dump and alternator transients in 12 V vehicle electrical systems. IC Role / Device Role / Timing Role: Dual-Zener clamping element referenced to chassis ground, absorbing energy during ISO 7637-2 Pulse 5a events. Use Value: Prevents latch-up or damage to downstream ASICs by limiting rail voltage to ≤18.4 V while maintaining <0.05 μA leakage at nominal 14 V battery. |
Use Scenario: Providing matched, temperature-stable 18 V references for dual-channel RTD or thermocouple amplifier biasing in PLC analog input modules. IC Role / Device Role / Timing Role: Precision voltage reference source with +12.4 mV/K tempco compensated via circuit design, mounted on isolated PCB section. Use Value: Enables <±0.5 % full-scale accuracy over –40 °C to +125 °C without trimming, leveraging dual-diode matching within one package. |
| Automotive Body Control Module (BCM) Voltage Monitoring | Telecom Power Supply Overvoltage Protection |
Use Scenario: Monitoring battery voltage integrity and triggering low/high-voltage warnings in BCMs using resistor-divider feedback into MCU ADC. IC Role / Device Role / Timing Role: Stable 18 V Zener shunt regulator supplying known reference to comparator input stage. Use Value: Delivers <0.5 % reference drift over lifetime due to ±2 % initial tolerance and AEC-Q101 stress validation, reducing field recalibration needs. |
Use Scenario: Safeguarding 12 V telecom DC-DC converter outputs against overvoltage faults caused by feedback loop failure. IC Role / Device Role / Timing Role: Fast-acting crowbar element that conducts heavily above 18.4 V to trigger upstream OVP shutdown. Use Value: Achieves <100 ns response to overvoltage via low 225 Ω rdif, preventing damage to sensitive PoE controllers before protection ICs react. |
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 MMBZ5245BS | Single 18 V Zener, SOT23, ±5 % tolerance, no AEC-Q101 qualification | Lacks dual-diode integration and automotive qualification; requires two devices for same function | Select only for cost-sensitive non-automotive consumer applications where dual functionality is not needed |
| Vishay BZX84-B18 | Single 18 V Zener, SOT23, ±2 % tolerance, AEC-Q101 qualified, no dual configuration | Provides same voltage accuracy and qualification but cannot replace dual-cathode topology without board redesign | Choose when space allows separate placement and only one regulated rail is required |
Compared with BZB84-B18-QR, MMBZ5245BS offers lower cost but sacrifices dual-diode integration and automotive reliability, while BZX84-B18 matches accuracy and qualification but lacks the space-saving common-anode dual architecture essential for compact ECU designs.
Availability
BZB84-B18-QR is available at Aetrix Electronics and suitable for automotive ECU power management, industrial sensor reference design, and telecom overvoltage protection requiring stable component supply with AEC-Q101 compliance and SOT23 surface-mount compatibility.
Supply support for BZB84-B18-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 delivering high-performance, reliable discrete, logic, and MOSFET devices with focus on efficiency, miniaturization, and automotive-grade robustness.
BZB84-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode portfolio, engineered specifically for voltage regulation and transient suppression in harsh automotive and industrial power systems.
FAQ
What is the maximum continuous reverse current rating for BZB84-B18-QR?
The device has no specified continuous reverse current rating; its operation is defined by Zener test current (IZ = 5 mA) and total power dissipation limit of 300 mW. At 18 V, this corresponds to a maximum average reverse current of 16.7 mA under ideal thermal conditions, but actual usable current depends on PCB copper area and ambient temperature per the 417 K/W Rth(j-a) value.
Can BZB84-B18-QR be used in a series configuration to achieve higher voltage regulation?
No - the device features a fixed common-anode topology with two cathodes (Pins 1 and 2) and one shared anode (Pin 3); it is not designed for series stacking. Attempting series connection would short one diode and invalidate regulation. For higher voltages, select a single Zener from the BZB84-Q series with nominal VZ ≥ desired level (e.g., BZB84-B24-Q for 24 V).
How does the temperature coefficient affect regulation accuracy over –40 °C to +125 °C?
At 18 V nominal, the BZB84-B18-QR exhibits a typical temperature coefficient of +12.4 mV/K. Over a 165 K range, this produces ~2.05 V total drift - however, the datasheet specifies VZ limits (17.6–18.4 V) already include worst-case tempco effects across the full operating range, so system-level accuracy remains bounded by the ±2 % initial tolerance plus thermal drift within those min/max boundaries.
Is the SOT23 package lead-free and RoHS compliant?
Yes - BZB84-B18-QR uses a lead-free, RoHS-compliant SOT23 package with matte tin (Sn) termination finish, qualified for reflow soldering per J-STD-020 moisture sensitivity level 1 (MSL1), and compatible with standard Pb-free assembly processes including peak temperatures up to 260 °C.
BZB84-B18-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):
- 18 V
- Tolerance:
- ±2%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 45 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 12.6 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-B18-QR FAQ
1.How can I place an order for BZB84-B18-QR through Aetrix?
Please submit a Request for Quotation (RFQ) for BZB84-B18-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-B18-QR reliable?
The price and inventory of BZB84-B18-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-B18-QR is usually 5 days.
3.What payment methods are accepted for BZB84-B18-QR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZB84-B18-QR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZB84-B18-QR?
BZB84-B18-QR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZB84-B18-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-B18-QR?
For technical support, including BZB84-B18-QR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZB84-B18-QR requirements.
6.How does Aetrix verify that BZB84-B18-QR is sourced from the original manufacturer or authorized distributors?
All BZB84-B18-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-B18-QR meets industry standards.
7.What is the process for return or replacement of BZB84-B18-QR?
All BZB84-B18-QR units undergo pre-shipment inspection (PSI). If there is an issue with BZB84-B18-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-B18-QR part is unused and in its original packaging.
Return procedure for BZB84-B18-QR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZB84-B18-QR Tags
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