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Nexperia USA Inc. BZX38450-C68F
- Part No.:
- BZX38450-C68F
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX38450-C68F.pdf
- Description:
- DIODE ZENER 68V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:8,312
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Product details
Overview
BZX38450-C68F 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 provides a nominal 6.8 V regulation at 50 µA test current, with ±2 % tolerance, 80 Ω differential resistance at 5 mA, and 1.2 mV/K temperature coefficient - enabling stable operation in battery-powered sensor nodes and portable instrumentation.
For engineers reviewing the BZX38450-C68F datasheet, BZX38450-C68F pinout, BZX38450-C68F application, or BZX38450-C68F equivalent, key selection criteria include its low 50 µA regulation current, 300 mW power rating, SOD323 footprint compatibility, and optimized leakage behavior for noise-sensitive analog front-ends.
Technical Context
This Zener diode operates in reverse breakdown mode with specified regulation voltage (VZ = 6.66–6.94 V) at IZ = 50 µA, and maintains tight dynamic impedance (rdiff ≤ 80 Ω at 5 mA). Its thermal resistance from junction to ambient is 415 K/W on FR4 PCB, supporting operation up to 150 °C junction temperature.
The device belongs to the "C" tolerance series (±2 %), features intentional minor leakage current optimization per AN90031 for fast switching and reduced noise, and exhibits 100 pF capacitance at 0 V reverse bias - critical for high-frequency stability in reference paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VZ (nominal) | 6.8 V - precise reference voltage at 50 µA test current for low-bias applications |
| VZ tolerance | ±2 % - ensures tight voltage accuracy without trimming in production |
| rdiff | ≤ 80 Ω at 5 mA - low dynamic impedance minimizes output voltage variation under load changes |
| IZ test current | 50 µA - enables stable regulation in micro-power systems (e.g., coin-cell IoT sensors) |
| Ptot | 300 mW at Tamb ≤ 25 °C - sufficient headroom for transient surges in compact SOD323 layout |
| SZ | +1.2 mV/K - positive temperature coefficient enables predictable drift compensation in multi-diode references |
| Cd | 100 pF at 0 V - low junction capacitance preserves bandwidth in feedback networks and ADC references |
Pinout & Package
Package: SOD323 (SC-76), surface-mount plastic package; 2-pin, 1.3 mm pitch, 1.7 mm × 1.25 mm × 0.95 mm body; cathode marked by bar on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (K) | Cathode | Connected to regulated output node; marking bar identifies this terminal for correct PCB orientation |
| 2 (A) | Anode | Connected to ground or lower-potential rail; reverse-biased configuration establishes Zener conduction |
Key Features
| Feature | Design Value |
|---|---|
| Low test current operation | Specified at 50 µA - reduces quiescent current in always-on battery circuits by >95 % vs. standard 5 mA Zeners |
| Tight voltage tolerance | ±2 % (C-series) - eliminates need for post-assembly calibration in medical and measurement equipment |
| Optimized leakage profile | Intentional minor IR rise per AN90031 - improves switching speed and suppresses broadband noise in LDO feedback paths |
| Thermal robustness | 150 °C max junction temperature - supports deployment in automotive cabin modules and industrial edge controllers |
| Standardized footprint | SOD323 package - enables drop-in replacement across Nexperia's BZX38450-B/C families and broad design reuse |
Applications
| Portable Sensor Biasing | ADC Reference Stabilization |
|---|---|
|
Use Scenario: Powering MEMS accelerometers and temperature sensors in Bluetooth LE wearables with CR2032 batteries. IC Role / Device Role: Provides stable 6.8 V reference for op-amp signal conditioning and ADC driver stages. Use Value: 50 µA regulation current extends battery life beyond 2 years while maintaining <0.5 % full-scale error over −20 to +70 °C. |
Use Scenario: Voltage reference for 12-bit SAR ADCs in handheld multimeters and data loggers. IC Role / Device Role: Low-noise Zener source feeding resistive divider into ADC REF+ input. Use Value: 80 Ω rdiff and 100 pF Cd limit reference settling time to <5 µs and reduce code spread by 3 LSB RMS. |
| Low-Power MCU Reset Circuit | IoT Node Voltage Monitoring |
|
Use Scenario: Generating clean reset threshold for ARM Cortex-M0+ microcontrollers in energy-harvesting nodes. IC Role / Device Role: Zener-clamped voltage divider sets reliable POR/RESET threshold independent of supply ripple. Use Value: ±2 % VZ tolerance ensures reset assertion within 6.6–6.9 V across temperature, eliminating false resets during brown-out events. |
Use Scenario: Battery voltage supervision in NB-IoT trackers using single-cell Li-SOCl₂ primary cells. IC Role / Device Role: Precision shunt element in comparator-based undervoltage lockout (UVLO) circuit. Use Value: +1.2 mV/K SZ allows accurate end-of-life detection at 2.8 V cutoff with <0.1 V error over −40 to +85 °C operating range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX384-C6V8 | Same VZ (6.8 V), but ±5 % tolerance and higher rdiff (150 Ω); no leakage optimization | Acceptable for non-critical power rails where cost is prioritized over precision or noise | Select only when ±5 % accuracy suffices and system-level filtering compensates for higher impedance |
| MMSZ5235B | 6.8 V nominal, ±5 %, 5 mA test current, 100 Ω rdiff, SOD-123 package (larger footprint) | Requires PCB redesign; higher 5 mA IZ increases standby current 100× vs. BZX38450-C68F | Choose only if legacy SOD-123 layout exists and micro-power operation is not required |
Compared with BZX384-C6V8 and MMSZ5235B, BZX38450-C68F delivers superior accuracy, lower bias current, and noise-optimized leakage - making it the sole choice for space-constrained, battery-operated systems demanding long-term voltage stability without active regulation.
Availability
BZX38450-C68F is available at Aetrix Electronics and suitable for portable sensor biasing, ADC reference stabilization, and low-power MCU reset circuits requiring stable component supply with guaranteed long-term continuity.
Supply support for BZX38450-C68F 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 advanced packaging and automotive-qualified components.
The BZX38450 series belongs to Nexperia's precision low-current Zener portfolio, engineered specifically for micro-power analog reference and biasing in battery-constrained and noise-sensitive applications.
FAQ
What is the maximum reverse current (IR) at 6.0 V for BZX38450-C68F?
At 6.0 V reverse bias and Tj = 25 °C, the typical reverse current is 0.1 µA, with a maximum of 0.5 µA per datasheet Table 8. This ultra-low leakage ensures minimal loading on high-impedance reference dividers and preserves battery life in always-on monitoring circuits.
Can BZX38450-C68F be used in series for higher reference voltages?
Yes - its matched temperature coefficient (+1.2 mV/K) and low rdiff allow stable series stacking (e.g., two units for ~13.6 V). However, total power dissipation must remain ≤300 mW, and thermal coupling between devices should be minimized to avoid coefficient drift.
Is the SOD323 package compatible with standard reflow profiles?
Yes - Nexperia specifies compatibility with IPC/JEDEC J-STD-020D reflow profiles. The recommended peak temperature is 260 °C for ≤30 seconds, with solder land dimensions defined in Figure 10 of the datasheet for optimal wetting and void control.
How does the "intentional minor rise of leakage current" improve performance?
Per Application Note AN90031, this controlled increase in IR near VZ reduces minority-carrier lifetime effects, yielding faster turn-on/turn-off response and lower wideband noise - critical for precision references in switched-capacitor filters and sigma-delta modulators.
BZX38450-C68F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX38450
- Package/Case:
- SC-76, SOD-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 68 V
- Tolerance:
- ±5%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 240 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 47.6 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-C68F FAQ
1.How can I place an order for BZX38450-C68F through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX38450-C68F 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-C68F reliable?
The price and inventory of BZX38450-C68F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX38450-C68F is usually 5 days.
3.What payment methods are accepted for BZX38450-C68F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX38450-C68F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX38450-C68F?
BZX38450-C68F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX38450-C68F 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-C68F?
For technical support, including BZX38450-C68F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX38450-C68F requirements.
6.How does Aetrix verify that BZX38450-C68F is sourced from the original manufacturer or authorized distributors?
All BZX38450-C68F 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-C68F meets industry standards.
7.What is the process for return or replacement of BZX38450-C68F?
All BZX38450-C68F units undergo pre-shipment inspection (PSI). If there is an issue with BZX38450-C68F, 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-C68F part is unused and in its original packaging.
Return procedure for BZX38450-C68F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX38450-C68F Tags
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BZT52C5V6T-7
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MMSZ5231B-7-F
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BZX84C3V3LT1G
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MMSZ5245BS-7-F
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MMSZ4682T1G
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
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SMAJ4744A-TP
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BZT52C3V6LP-7
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SMAZ12-13-F
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