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Nexperia USA Inc. BZB84-C18-QR
- Part No.:
- BZB84-C18-QR
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Zener Diode Arrays
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZB84-C18-QR.pdf
- Description:
- BZB84-C18-Q/SOT23/TO-236AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,140
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Product details
Overview
BZB84-C18-QR from Nexperia is a dual common-anode Zener diode in SOT23 package, providing precision voltage regulation at nominal 18 V with ±5 % tolerance. It delivers 225 Ω differential resistance at 5 mA, supports 1.5 A non-repetitive peak reverse current, and operates across –55 °C to +150 °C ambient range-designed for automotive power rail stabilization and ECU reference voltage generation.
For engineers reviewing the BZB84-C18-QR datasheet, BZB84-C18-QR pinout, BZB84-C18-QR application, or BZB84-C18-QR equivalent, this page provides verified electrical parameters, thermal behavior, dual-diode terminal mapping, AEC-Q101 qualification status, and direct substitution guidance for automotive-grade Zener regulation.
Technical Context
This dual-Zener device integrates two independent Zener junctions sharing a common anode (Pin 3), enabling compact dual-rail clamping or complementary reference generation in space-constrained PCB layouts. Its 18 V nominal Zener voltage exhibits a +12.4 mV/K temperature coefficient at 5 mA, ensuring predictable drift under thermal stress.
The SOT23 package delivers 417 K/W junction-to-ambient thermal resistance in free air and supports 300 mW total power dissipation at 25 °C ambient-validated per IEC 60134 limiting values and qualified to AEC-Q101 for automotive under-hood deployment.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 16.8 V to 19.1 V at IZ = 5 mA - defines regulation band for stable 18 V reference under load variation |
| Differential Resistance (rdif) | 225 Ω max at IZ = 5 mA - determines output impedance and load regulation error |
| Temperature Coefficient (SZ) | +12.4 mV/K typical at IZ = 5 mA - quantifies voltage drift per degree Celsius in operating environment |
| Non-repetitive Peak Reverse Current (IZSM) | 1.5 A at tp = 100 µs - specifies surge handling capability for transient suppression |
| Total Power Dissipation (Ptot) | 300 mW at Tamb ≤ 25 °C - sets maximum continuous DC power budget on standard FR4 PCB |
| Forward Voltage (VF) | 0.9 V max at IF = 10 mA - limits conduction loss when used in forward-biased protection paths |
| Junction Temperature (Tj) | 150 °C max - constrains thermal design margin for high-temperature automotive applications |
Pinout & Package
SOT23 plastic surface-mount package (2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm pin pitch) with gull-wing leads and moisture sensitivity level 1 (MSL1).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | K1 (Cathode 1) | Anode-referenced Zener 1 output node; connects to regulated rail requiring 18 V clamping |
| 2 | K2 (Cathode 2) | Anode-referenced Zener 2 output node; enables independent second 18 V reference or dual-rail monitoring |
| 3 | CA (Common Anode) | Shared anode connection; ties both Zeners to system ground or negative supply for bidirectional regulation |
Key Features
| Feature | Design Value |
|---|---|
| Dual common-anode topology | Reduces board area by 40 % vs. discrete dual-Zener solutions while maintaining independent cathode control |
| AEC-Q101 qualification | Validated for automotive under-hood use including temperature cycling, humidity bias, and mechanical shock testing |
| ±5 % Zener tolerance (C-series) | Enables cost-optimized regulation where tight voltage accuracy is secondary to robustness and footprint |
| 150 °C maximum junction temperature | Supports operation in engine control units and transmission modules without derating below 125 °C ambient |
| 40 W non-repetitive peak power rating | Withstands ISO 7637-2 pulse 1/2a transients up to 100 µs duration without failure |
Applications
| Automotive Engine Control Unit (ECU) | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Stabilizing 5 V and 12 V reference rails in diesel ECU power management ICs exposed to battery dump energy. IC Role / Device Role / Timing Role: Dual-Zener clamp protecting ADC reference inputs and microcontroller reset circuitry from overvoltage events. Use Value: Eliminates need for external TVS + Zener combo; CA pin simplifies grounding while K1/K2 isolate sensitive analog domains. |
Use Scenario: Providing matched 18 V references for dual-channel 4–20 mA transmitter front-ends in hazardous-area process controllers. IC Role / Device Role / Timing Role: Precision voltage source for current loop excitation and DAC feedback networks requiring low-drift dual references. Use Value: Identical VZ tracking between diodes minimizes channel-to-channel offset in differential measurement systems. |
| Automotive Body Control Module (BCM) | Medical Infusion Pump Power Supervision |
Use Scenario: Regulating auxiliary 18 V supply for LIN transceivers and LED drivers in door module PCBs with limited thermal mass. IC Role / Device Role / Timing Role: Low-power Zener shunt regulator maintaining stable bias for CAN/LIN interface ICs during cold-crank conditions. Use Value: 300 mW Ptot and SOT23 footprint enable integration into dense BCM layouts without heatsinking. |
Use Scenario: Monitoring main 24 V DC input against overvoltage thresholds in Class II medical infusion pumps with isolated power supplies. IC Role / Device Role / Timing Role: Dual-threshold detector using K1 and K2 to trigger separate fault latches for >22 V and <14 V conditions. Use Value: Common-anode architecture allows single-point ground sensing while maintaining galvanic isolation between alarm channels. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZB84-B18-Q | ±2 % tolerance (vs. ±5 %), 175 Ω rdif, +12.4 mV/K SZ | Higher accuracy required in precision reference circuits; tighter thermal drift spec | Select when reference stability < ±1 % is mandatory and cost premium is acceptable |
| MMBZ5242BS | Single Zener (18 V), SOT363 package, 150 mW Ptot, no common-anode topology | Limited to single-rail regulation; requires two devices for dual-output functionality | Choose only if board layout permits separate placement and thermal management of two devices |
Compared with BZB84-C18-QR, the BZB84-B18-Q offers tighter voltage control at higher cost and identical thermal performance, while MMBZ5242BS sacrifices dual functionality and power rating for smaller footprint-making BZB84-C18-QR optimal for cost-sensitive, space-constrained dual-rail automotive regulation.
Availability
BZB84-C18-QR is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor signal conditioning, and medical power supervision requiring stable component supply with AEC-Q101 compliance and SOT23 manufacturability.
Supply support for BZB84-C18-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 discrete and logic devices, with leadership in automotive-qualified components and advanced packaging technologies.
The BZB84-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode portfolio, engineered specifically for robust voltage regulation in automotive power systems where thermal resilience and surge immunity are critical.
FAQ
What is the maximum continuous reverse current for BZB84-C18-QR at 25 °C ambient?
The device supports up to 200 mA forward current per diode, but continuous reverse (Zener) current is limited by thermal dissipation. At 25 °C ambient, 300 mW total power dissipation allows ~16.7 mA average Zener current (18 V × 16.7 mA = 300 mW), assuming both diodes share load equally and no additional derating.
Can BZB84-C18-QR be used in parallel configurations for higher power handling?
No-parallel connection of Zener diodes causes current imbalance due to VZ tolerance (±5 %). Even with matched units, differential resistance mismatch (225 Ω max) leads to unequal current sharing and potential thermal runaway. Use a single higher-power Zener or active regulation instead.
How does the common-anode configuration affect PCB layout for dual-rail applications?
The shared anode (Pin 3) must connect to a low-impedance ground or negative rail. Cathodes (Pins 1 and 2) route independently to separate regulated nodes, enabling asymmetric loading-e.g., one cathode powering a 5 V LDO, the other a 12 V supervisor-without interaction.
Is BZB84-C18-QR compatible with lead-free reflow soldering profiles?
Yes-it is qualified for standard JEDEC J-STD-020D Level 1 moisture sensitivity and withstands peak reflow temperatures up to 260 °C. The SOT23 footprint in Figure 12 (reflow solder lands: 0.6 mm × 0.6 mm, 0.7 mm spacing) ensures reliable joint formation with SnAgCu paste.
BZB84-C18-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:
- ±5%
- 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-C18-QR FAQ
1.How can I place an order for BZB84-C18-QR through Aetrix?
Please submit a Request for Quotation (RFQ) for BZB84-C18-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-C18-QR reliable?
The price and inventory of BZB84-C18-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-C18-QR is usually 5 days.
3.What payment methods are accepted for BZB84-C18-QR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZB84-C18-QR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZB84-C18-QR?
BZB84-C18-QR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZB84-C18-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-C18-QR?
For technical support, including BZB84-C18-QR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZB84-C18-QR requirements.
6.How does Aetrix verify that BZB84-C18-QR is sourced from the original manufacturer or authorized distributors?
All BZB84-C18-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-C18-QR meets industry standards.
7.What is the process for return or replacement of BZB84-C18-QR?
All BZB84-C18-QR units undergo pre-shipment inspection (PSI). If there is an issue with BZB84-C18-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-C18-QR part is unused and in its original packaging.
Return procedure for BZB84-C18-QR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZB84-C18-QR Tags
-
MMBZ18VALT1G
onsemi
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AZ23C18-7-F
Diodes Incorporated
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MMBZ6V2ALT1G
onsemi
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MMBZ5V6ALT1G
onsemi
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MMBZ6V8ALT1G
onsemi
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MMBZ5V6ALT3G
onsemi
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MMBZ33VALT1G
onsemi
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MMBZ9V1ALT1G
onsemi
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MMBZ20VALT1G
onsemi
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SZMMBZ27VALT1G
onsemi
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MMBZ15VALT1G
onsemi
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MMBZ12VALT1G
onsemi
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