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Nexperia USA Inc. BZX38450-B30X
- Part No.:
- BZX38450-B30X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX38450-B30X.pdf
- Description:
- DIODE ZENER 30V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:9,036
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Product details
Overview
BZX38450-B30X from Nexperia is a low-current Zener voltage regulator diode in SOD323 (SC-76) package, designed for precision biasing and voltage reference in ultra-low-power circuits. It delivers a nominal 30 V regulation at 50 µA test current, with ±2 % tolerance, 300 mW total power dissipation, and 22.8 µA reverse current at 24.4 V reverse voltage - ideal for battery-powered sensor nodes and portable instrumentation.
For engineers reviewing the BZX38450-B30X datasheet, BZX38450-B30X pinout, BZX38450-B30X application, or BZX38450-B30X equivalent, key selection criteria include its low 50 µA regulation current, tight ±2 % tolerance, SOD323 footprint compatibility, and specified differential resistance of 300 Ω at 5 mA - critical for stable reference generation in energy-constrained designs.
Technical Context
This Zener diode operates in reverse breakdown mode with a nominal working voltage of 30 V, specified at IZ = 50 µA to ensure minimal quiescent current draw. Its temperature coefficient is +0.05 mV/K, indicating near-zero drift over ambient temperature variations.
The device exhibits 300 Ω differential resistance at 5 mA, supporting stable regulation under light load transients, and features 29.4 pF capacitance at 0 V reverse bias - suitable for low-frequency reference and bias applications without signal integrity compromise.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 30 V at IZ = 50 µA - enables precise low-power voltage reference in microampere-bias circuits |
| Tolerance | ±2 % - ensures tight output voltage consistency across production batches for calibrated systems |
| Power Dissipation | 300 mW at Tamb ≤ 25 °C - supports continuous operation on standard FR4 PCB without heatsinking |
| Differential Resistance | 300 Ω at IZ = 5 mA - maintains regulation stability against small load current variations |
| Reverse Current | 22.8 µA at VR = 24.4 V - confirms sharp knee and low leakage below regulation threshold |
| Forward Voltage | 0.9 V at IF = 10 mA - defines anode-cathode conduction drop for polarity-sensitive protection use |
| Package | SOD323 (SC-76), 1.7 mm × 1.25 mm × 0.95 mm - enables high-density placement in space-constrained portable PCBs |
Pinout & Package
SOD323 (SC-76) surface-mount plastic package with 2 leads, 1.3 mm pitch, and cathode marked by a bar on the body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; marking bar identifies this terminal for correct orientation during placement |
| 2 | Anode (A) | Connected to ground or lower-potential rail; reverse-biased configuration establishes Zener breakdown path |
Key Features
| Feature | Design Value |
|---|---|
| Low test current specification | Regulated at 50 µA - reduces standby power in always-on IoT sensors and wearables |
| Tight voltage tolerance | ±2 % - eliminates need for post-production trimming in factory-calibrated instruments |
| Optimized leakage profile | Intentional minor rise in leakage per AN90031 - improves switching speed and noise immunity in dynamic bias networks |
| Thermal resistance | Rth(j-a) = 415 K/W - allows direct thermal modeling on standard single-sided FR4 layouts |
Applications
| Portable Sensor Biasing | Low-Power ADC Reference |
|---|---|
|
Use Scenario: Powering analog front-end circuitry in battery-operated environmental sensors (e.g., CO₂, humidity) with multi-year runtime requirements. IC Role / Device Role / Timing Role: Provides stable 30 V reference for op-amp gain-setting and sensor excitation, operating continuously at <100 µA total system current. Use Value: Enables accurate 16-bit measurement resolution without active voltage regulators, reducing BOM count and self-heating error. |
Use Scenario: Supplying reference voltage to 12-bit SAR ADCs in handheld medical diagnostic tools powered by coin-cell batteries. IC Role / Device Role / Timing Role: Acts as precision shunt reference for ADC VREF input, leveraging its ±2 % tolerance and low 50 µA operating point. Use Value: Delivers consistent full-scale voltage without loading the battery, extending operational life beyond 5000 measurements per charge. |
| EEPROM Write Protection | Microcontroller Reset Threshold |
|
Use Scenario: Generating controlled overvoltage detection signal to disable EEPROM write cycles during brown-out conditions in industrial controllers. IC Role / Device Role / Timing Role: Functions as voltage-sensing element in discrete reset comparator circuit, triggering at 30 V ±0.6 V threshold. Use Value: Prevents data corruption during unstable supply transitions using passive, zero-quiescent-current detection. |
Use Scenario: Setting reliable power-on reset threshold for 3.3 V microcontrollers in automotive body-control modules with wide-input DC-DC supplies. IC Role / Device Role / Timing Role: Supplies regulated 30 V to external supervisor IC that monitors 5 V intermediate rail and asserts reset below 4.75 V. Use Value: Ensures deterministic reset timing independent of input ripple, eliminating spurious reboots during load-dump events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX384-C30 | ±5 % tolerance, higher 300 µA leakage at 24.4 V, same SOD323 package | Acceptable where calibration margin >1.5 V and standby current <1 µA is not required | Select when cost sensitivity outweighs precision needs and board layout must remain unchanged |
| MMSZ5256B | 30 V nominal, ±5 %, 500 mW rating, SOD-123 package (larger footprint, 2.7 mm × 1.6 mm) | Requires PCB redesign; better thermal performance but incompatible with ultra-dense layouts | Choose only if higher power handling (>300 mW) or legacy SOD-123 compatibility is mandatory |
Compared with BZX38450-B30X, BZX384-C30 trades precision for cost and MMSZ5256B trades size for thermal headroom - making the B30X optimal for new designs prioritizing accuracy, ultra-low bias, and miniaturization in portable electronics.
Availability
BZX38450-B30X is available at Aetrix Electronics and suitable for portable sensor biasing, low-power ADC reference, EEPROM write protection, and microcontroller reset threshold applications requiring stable component supply across high-mix, low-volume production runs.
Supply support for BZX38450-B30X 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-performance, energy-efficient components for automotive, industrial, and consumer markets, with leadership in logic, discretes, and MOSFETs.
The BZX38450 series belongs to Nexperia's precision low-current Zener portfolio, engineered specifically for battery-powered instrumentation and space-constrained reference design where sub-100 µA operation and ±2 % accuracy are mandatory.
FAQ
What is the maximum reverse voltage before breakdown for BZX38450-B30X?
The device is rated for nominal 30 V Zener voltage at 50 µA test current, with guaranteed minimum breakdown of 29.4 V and maximum of 30.6 V per datasheet Table 8. It does not conduct significantly below 29.4 V, ensuring clean turn-on behavior in reference circuits.
Can BZX38450-B30X be used in series for higher voltage references?
Yes - two units in series yield ~60 V with matched ±2 % tolerance, but thermal coupling and individual leakage variance require derating. Total power must stay within 300 mW per device, and differential resistance adds cumulatively, affecting regulation stiffness.
Is the SOD323 package compatible with standard reflow profiles?
Yes - Nexperia specifies JEDEC J-STD-020-compliant reflow for SOD323. Peak temperature up to 260 °C is allowed, with solder land dimensions defined in Figure 10. No special flux or preheat ramp is required for standard lead-free processes.
Does BZX38450-B30X meet automotive AEC-Q200 requirements?
No - this part is not AEC-Q200 qualified. Nexperia explicitly states in Section 14 that non-automotive qualified products like BZX38450-B30X are unsuitable for automotive safety-critical systems and lack extended temperature validation beyond −55 °C to +150 °C ambient limits.
BZX38450-B30X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX38450
- Package/Case:
- SC-76, SOD-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 30 V
- Tolerance:
- ±2%
- Power - Max:
- 300 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
BZX38450-B30X FAQ
1.How can I place an order for BZX38450-B30X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX38450-B30X 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 BZX38450-B30X reliable?
The price and inventory of BZX38450-B30X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX38450-B30X is usually 5 days.
3.What payment methods are accepted for BZX38450-B30X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX38450-B30X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX38450-B30X?
BZX38450-B30X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX38450-B30X 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 BZX38450-B30X?
For technical support, including BZX38450-B30X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX38450-B30X requirements.
6.How does Aetrix verify that BZX38450-B30X is sourced from the original manufacturer or authorized distributors?
All BZX38450-B30X 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 BZX38450-B30X meets industry standards.
7.What is the process for return or replacement of BZX38450-B30X?
All BZX38450-B30X units undergo pre-shipment inspection (PSI). If there is an issue with BZX38450-B30X, 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 BZX38450-B30X part is unused and in its original packaging.
Return procedure for BZX38450-B30X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX38450-B30X Tags
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