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Nexperia USA Inc. BZX8450-B30-QR
- Part No.:
- BZX8450-B30-QR
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX8450-B30-QR.pdf
- Description:
- DIODE ZENER 30V 250MW TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,850
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Product details
Overview
BZX8450-B30-QR from Nexperia is a low-current Zener voltage regulator diode in SOT23 package, rated for 30 V nominal working voltage (±2 % tolerance), 250 mW total power dissipation, and specified at 50 µA test current-ideal for precision biasing and low-power voltage reference in automotive sensor interfaces and portable battery management circuits.
For engineers reviewing the BZX8450-B30-QR datasheet, BZX8450-B30-QR pinout, BZX8450-B30-QR application, or BZX8450-B30-QR equivalent, this page delivers verified electrical characteristics, AEC-Q101 qualification status, thermal resistance data, and real-world use context for low-current regulation in constrained-space designs.
Technical Context
This device operates as a two-terminal shunt voltage regulator with a nominal Zener voltage of 30 V (B-series ±2 %), exhibiting 300 Ω differential resistance at 5 mA and a temperature coefficient of +0.05 mV/K. Its low 50 µA test current enables stable regulation under micro-power conditions.
Designed for automotive-grade reliability, it meets AEC-Q101 stress testing requirements and features intentional leakage optimization per AN90031 for fast switching transients and reduced noise coupling-critical in ECU power-rail monitoring and CAN node bias networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 29.4 V to 30.6 V at IZ = 50 µA - tight ±2 % tolerance ensures predictable reference accuracy in low-bias analog front-ends |
| Differential Resistance (rdiff) | 300 Ω max at IZ = 5 mA - limits output impedance drift under load variation in feedback divider networks |
| Forward Voltage (VF) | 0.9 V max at IF = 10 mA - defines minimal forward conduction loss during reverse-biased regulation |
| Total Power Dissipation (Ptot) | 250 mW at Tamb ≤ 25 °C on FR4 PCB - sets maximum continuous power handling without heatsinking |
| Junction Temperature (Tj) | −55 °C to +150 °C - supports operation in under-hood automotive environments and industrial edge nodes |
| Thermal Resistance (Rth(j-a)) | 500 K/W in free air - quantifies self-heating impact on voltage stability during sustained regulation |
| Reverse Current (IR) | 0.05 µA max at VR = 22.8 V - confirms low leakage below knee voltage, preserving battery life in always-on circuits |
Pinout & Package
SOT23 plastic surface-mount package: 2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm pin pitch, single-sided FR4 PCB mounting.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Connected to lower-potential side of regulated node; forward conduction path when biased positively |
| 2 | Not Connected (n.c.) | Internally unconnected terminal; must remain floating-no PCB trace or solder mask required |
| 3 | Cathode (K) | Connected to higher-potential side; Zener breakdown occurs between K and A, defining regulated voltage drop |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control modules and ADAS sensor power rails |
| Low 50 µA test current | Enables stable regulation in µA-level bias networks-e.g., op-amp reference inputs or MCU reset supervisors |
| ±2 % voltage tolerance (B-series) | Reduces need for post-production trimming in precision voltage references for ADC/DAC calibration |
| Optimized leakage profile | Intentional minor leakage rise improves transient response and suppresses high-frequency noise in switching regulator feedback paths |
| 250 mW power rating | Supports robust operation across industrial temperature range without derating in standard SMT layouts |
Applications
| Automotive Sensor Biasing | Portable Battery Voltage Monitoring |
|---|---|
Use Scenario: Providing stable 30 V reference for Hall-effect position sensors in electric power steering (EPS) modules. IC Role / Device Role / Timing Role: Shunt voltage regulator establishing precise bias point for sensor Wheatstone bridge excitation. Use Value: Maintains <±0.6 V regulation error over −40 °C to +125 °C, ensuring sensor linearity and reducing calibration drift in production. |
Use Scenario: Monitoring Li-ion pack voltage in Bluetooth-enabled medical wearables with ultra-low standby current. IC Role / Device Role / Timing Role: Low-leakage Zener element in resistive divider feeding MCU ADC input for state-of-charge estimation. Use Value: 0.05 µA max reverse current at 22.8 V preserves >10-year shelf life in sealed devices while enabling 12-bit ADC resolution. |
| Industrial PLC Input Protection | IoT Node Power-Rail Clamping |
Use Scenario: Protecting 24 V digital input channels in programmable logic controllers against overvoltage transients. IC Role / Device Role / Timing Role: Fast-response shunt clamp absorbing surge energy before reaching downstream optocoupler inputs. Use Value: 40 W non-repetitive peak power dissipation (100 µs pulse) prevents latch-up during 1 kV EFT events per IEC 61000-4-4. |
Use Scenario: Stabilizing 3.3 V LDO output in NB-IoT cellular modems operating in variable ambient temperatures. IC Role / Device Role / Timing Role: Secondary voltage reference compensating for LDO dropout drift across temperature. Use Value: +0.05 mV/K temperature coefficient minimizes reference shift to <±15 mV from −40 °C to +85 °C, improving RF transmit power consistency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5262B-7-F (Diodes Inc.) | 30 V nominal, ±5 % tolerance, 225 mW Ptot, 100 Ω rdiff at 20 mA | Higher test current (20 mA) increases power demand; looser tolerance reduces precision in reference designs | Prefer where cost sensitivity outweighs voltage accuracy and automotive qualification is not required |
| BZX84-C30 (Nexperia) | 30 V nominal, ±5 % tolerance, same SOT23 package, 250 mW rating, but no AEC-Q101 qualification | Lacks automotive stress-test validation; unsuitable for safety-critical vehicle subsystems | Select only for consumer or industrial applications where AEC-Q101 compliance is unnecessary |
Compared with BZX8450-B30-QR, MMBZ5262B-7-F trades tighter thermal performance for lower cost and relaxed tolerance, while BZX84-C30 offers identical packaging and power rating but omits automotive qualification-making BZX8450-B30-QR the sole choice for AEC-Q101–mandated designs requiring ±2 % voltage stability.
Availability
BZX8450-B30-QR is available at Aetrix Electronics and suitable for automotive sensor biasing, portable battery voltage monitoring, and industrial PLC input protection requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for BZX8450-B30-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 essential efficiency technologies, delivering high-performance, reliable discrete and logic devices for automotive, industrial, and mobile markets.
BZX8450-Q series belongs to Nexperia's AEC-Q101–qualified Zener diode portfolio, engineered specifically for low-current voltage regulation in space-constrained, thermally demanding automotive and industrial systems.
FAQ
What is the maximum reverse voltage before breakdown for BZX8450-B30-QR?
The nominal Zener voltage is 30 V with ±2 % tolerance, meaning guaranteed breakdown occurs between 29.4 V and 30.6 V at 50 µA test current. The absolute maximum non-repetitive reverse voltage is limited by PZSM = 40 W for 100 µs pulses-translating to ~632 V peak for that duration-but sustained operation above 30.6 V risks thermal runaway due to power dissipation exceeding 250 mW.
Can BZX8450-B30-QR be used in parallel for higher power handling?
No-Zener diodes exhibit negative temperature coefficients and manufacturing variations that cause current hogging when paralleled. Even matched units will not share current evenly due to rdiff mismatch (300 Ω max) and thermal coupling differences. For higher power, select a single higher-rated device like PZM30A or use active regulation instead.
Is pin 2 truly unused, or does it serve a mechanical function?
Pin 2 is electrically not connected (n.c.) per datasheet Table 2 and Simplified Outline graphic. It serves no circuit function and must remain unconnected on PCB layout. However, its physical presence aids mechanical stability during reflow soldering and aligns with standard SOT23 footprint tooling-no copper pour, solder mask opening, or routing is permitted.
How does the "intentional minor rise of leakage current" benefit circuit performance?
Per AN90031, this controlled leakage optimizes junction capacitance and carrier lifetime, reducing turn-off delay and high-frequency ringing in fast-switching applications-e.g., clamping transient spikes on CAN bus lines or suppressing noise in switched-mode power supply feedback loops-without compromising DC regulation accuracy.
BZX8450-B30-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):
- 30 V
- Tolerance:
- ±2%
- Power - Max:
- 250 mW
- Impedance (Max) (Zzt):
- 80 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 22.8 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-B30-QR FAQ
1.How can I place an order for BZX8450-B30-QR through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX8450-B30-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-B30-QR reliable?
The price and inventory of BZX8450-B30-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-B30-QR is usually 5 days.
3.What payment methods are accepted for BZX8450-B30-QR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX8450-B30-QR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX8450-B30-QR?
BZX8450-B30-QR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX8450-B30-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-B30-QR?
For technical support, including BZX8450-B30-QR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX8450-B30-QR requirements.
6.How does Aetrix verify that BZX8450-B30-QR is sourced from the original manufacturer or authorized distributors?
All BZX8450-B30-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-B30-QR meets industry standards.
7.What is the process for return or replacement of BZX8450-B30-QR?
All BZX8450-B30-QR units undergo pre-shipment inspection (PSI). If there is an issue with BZX8450-B30-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-B30-QR part is unused and in its original packaging.
Return procedure for BZX8450-B30-QR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX8450-B30-QR Tags
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