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Nexperia USA Inc. BZX8450-B24-QR
- Part No.:
- BZX8450-B24-QR
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX8450-B24-QR.pdf
- Description:
- DIODE ZENER 24V 250MW TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,603
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Product details
Overview
BZX8450-B24-QR from Nexperia is a low-current Zener voltage regulator diode in SOT23 package, designed for precision biasing and voltage reference in automotive and portable electronics. It delivers a nominal 24 V regulation at 50 µA test current, with ±2 % tolerance, 250 mW total power dissipation, and AEC-Q101 qualification for under-hood applications.
For engineers reviewing the BZX8450-B24-QR datasheet, BZX8450-B24-QR pinout, BZX8450-B24-QR application, or BZX8450-B24-QR equivalent, this page provides verified electrical characteristics, thermal behavior, automotive-grade reliability data, and real-world use context for low-power voltage stabilization in constrained PCB layouts.
Technical Context
This Zener diode operates in reverse breakdown with a specified working voltage of 23.5 V to 24.5 V at IZ = 50 µA, exhibiting a temperature coefficient of +18.2 mV/K and differential resistance of 250 Ω at IZ = 5 mA. Its low 50 µA test current enables stable regulation in ultra-low-quiescent circuits.
The device features intentional leakage optimization per AN90031 for fast switching and noise reduction, and its SOT23 footprint supports high-density routing while maintaining thermal resistance of 330 K/W (junction-to-solder point) on standard FR4 PCBs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Regulation Voltage (VZ) | 23.5 V to 24.5 V at IZ = 50 µA - defines precise clamping threshold for 24 V rail stabilization |
| Tolerance | ±2 % - ensures tight voltage accuracy without post-production trimming |
| Power Dissipation (Ptot) | 250 mW at Tamb ≤ 25 °C - limits thermal rise in unheatsinked SOT23 designs |
| Forward Voltage (VF) | ≤ 0.9 V at IF = 10 mA - enables low-loss forward conduction during transient recovery |
| Reverse Current (IR) | ≤ 0.05 µA at VR = 18.2 V - guarantees minimal standby leakage in battery-critical systems |
| Differential Resistance (rdiff) | 250 Ω at IZ = 5 mA - determines load regulation sensitivity and ripple rejection capability |
| Junction Temperature (Tj) | −55 °C to +150 °C - supports operation across full automotive ambient range |
Pinout & Package
SOT23 plastic surface-mount package: 3-terminal, 1.9 mm pitch, 2.9 mm × 1.3 mm × 1.0 mm body, tin-plated copper leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Connects to lower-potential node; reverse-biased during regulation |
| 2 | Not Connected (n.c.) | No internal bond; must remain unconnected on PCB to avoid parasitic coupling |
| 3 | Cathode (K) | Connects to higher-potential node; carries regulated current during breakdown |
Key Features
| Feature | Design Value |
|---|---|
| Low Test Current Operation | Specified at 50 µA - enables stable regulation in microamp-level bias networks for sensor interfaces and sleep-mode circuits |
| AEC-Q101 Qualification | Qualified for automotive use - meets stress-test requirements for temperature cycling, HTRB, and ESD robustness |
| Optimized Leakage Profile | Intentional minor leakage rise per AN90031 - reduces switching noise and improves transient response in feedback paths |
| Thermal Performance | Rth(j-sp) = 330 K/W - allows predictable junction temperature estimation using cathode solder-point as thermal reference |
Applications
| Automotive Cabin Control Module | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Voltage reference for analog-to-digital conversion of HVAC temperature sensors in dashboard ECUs. IC Role / Device Role / Timing Role: Zener reference diode providing stable 24 V-derived bias for op-amp front-end amplifiers. Use Value: ±2 % tolerance and +18.2 mV/K TC ensure <±10 mV drift over −40 °C to +85 °C, preserving ADC linearity. |
Use Scenario: Precision shunt regulator for 4–20 mA loop-powered pressure transmitters. IC Role / Device Role / Timing Role: Low-current Zener clamp setting loop compliance voltage and enabling zero-drift calibration. Use Value: 50 µA test current matches typical loop idle current, minimizing regulation error without external bias. |
| Portable Medical Pulse Oximeter | Smart Home Battery Management Unit |
Use Scenario: Reference source for LED driver current control in battery-operated SpO₂ sensors. IC Role / Device Role / Timing Role: Voltage reference stabilizing constant-current source feeding red/IR LEDs. Use Value: 250 mW power limit and SOT23 size allow integration into space-constrained wearable PCBs without heatsinking. |
Use Scenario: Overvoltage protection and voltage monitoring reference in lithium-ion cell balancing circuits. IC Role / Device Role / Timing Role: Zener clamp detecting >24.5 V fault condition on 24 V auxiliary supply rails. Use Value: 0.05 µA max reverse leakage at 18.2 V prevents measurable drain on backup coin cells during long-term storage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C24 | ±5 % tolerance, no AEC-Q101 qualification, same SOT23 package and 24 V nominal rating | Targeted at consumer-grade cost-sensitive designs where automotive reliability is not required | Select when qualification documentation and tighter tolerance are unnecessary and BOM cost is prioritized |
| MMSZ5245B | ±5 % tolerance, 500 mW Ptot, 350 Ω rdiff at 20 mA, non-automotive qualified | Higher power handling but looser regulation and no automotive stress validation | Choose only if >250 mW dissipation is needed and AEC-Q101 compliance is waived |
Compared with BZX8450-B24-QR, BZX84-C24 trades tolerance and qualification for lower unit cost, while MMSZ5245B offers higher power margin at the expense of regulation precision and automotive suitability-making the BZX8450-B24-QR optimal for safety-aware, space-constrained 24 V reference designs.
Availability
BZX8450-B24-QR is available at Aetrix Electronics and suitable for automotive cabin control modules, industrial 4–20 mA transmitters, portable medical sensors, and smart home battery management units requiring stable component supply with traceable automotive-grade sourcing.
Supply support for BZX8450-B24-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 energy-efficient solutions.
The BZX8450-Q series belongs to Nexperia's automotive Zener diode product line, engineered specifically for low-current voltage reference and regulation in harsh-environment electronic control units where AEC-Q101 compliance and tight tolerance are mandatory.
FAQ
What is the maximum reverse voltage before breakdown for BZX8450-B24-QR?
The BZX8450-B24-QR exhibits a guaranteed breakdown voltage range of 23.5 V to 24.5 V at IZ = 50 µA. Below 23.5 V, reverse current remains ≤ 0.05 µA; above 24.5 V, it enters controlled regulation with differential resistance of 250 Ω at 5 mA. Absolute maximum reverse voltage is not defined-operation beyond VZ range risks exceeding Ptot limits.
Can BZX8450-B24-QR be used in parallel for higher current handling?
No-parallel connection is not recommended due to mismatched Zener voltage tolerances and thermal runaway risk. Each diode's VZ variation (±2 %) causes unequal current sharing, and the positive temperature coefficient (+18.2 mV/K) exacerbates current hogging. For higher current, select a single higher-power Zener or use active regulation instead.
Is pin 2 truly unconnected, or does it serve a thermal function?
Pin 2 is electrically unconnected (n.c.) with no internal bond wire or die connection. It serves no circuit or thermal function-its presence is solely mechanical for SOT23 package symmetry and pick-and-place stability. PCB layout must leave it floating; connecting it introduces parasitic capacitance and potential noise coupling.
How does the "B" suffix in BZX8450-B24-QR affect performance versus "C" variants?
The "B" suffix denotes ±2 % voltage tolerance and optimized leakage profile per AN90031 for fast switching and noise reduction. "C" variants have ±5 % tolerance and lower leakage, making "B" preferred for precision reference applications where stability and dynamic response outweigh absolute leakage minimization.
BZX8450-B24-QR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX8450-Q
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 24 V
- Tolerance:
- ±2%
- Power - Max:
- 250 mW
- Impedance (Max) (Zzt):
- 70 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 18.2 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
BZX8450-B24-QR FAQ
1.How can I place an order for BZX8450-B24-QR through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX8450-B24-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 BZX8450-B24-QR reliable?
The price and inventory of BZX8450-B24-QR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX8450-B24-QR is usually 5 days.
3.What payment methods are accepted for BZX8450-B24-QR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX8450-B24-QR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX8450-B24-QR?
BZX8450-B24-QR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX8450-B24-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 BZX8450-B24-QR?
For technical support, including BZX8450-B24-QR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX8450-B24-QR requirements.
6.How does Aetrix verify that BZX8450-B24-QR is sourced from the original manufacturer or authorized distributors?
All BZX8450-B24-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 BZX8450-B24-QR meets industry standards.
7.What is the process for return or replacement of BZX8450-B24-QR?
All BZX8450-B24-QR units undergo pre-shipment inspection (PSI). If there is an issue with BZX8450-B24-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 BZX8450-B24-QR part is unused and in its original packaging.
Return procedure for BZX8450-B24-QR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX8450-B24-QR Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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BZT52C15-7-F
Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
Micro Commercial Co
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BZT52C3V6LP-7
Diodes Incorporated
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SMAZ12-13-F
Diodes Incorporated
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