My Inquiry
My Account
Nexperia USA Inc. BZX38450-C68X
- Part No.:
- BZX38450-C68X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX38450-C68X.pdf
- Description:
- DIODE ZENER 68V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:5,923
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BZX38450-C68X 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 6.8 V regulation at 50 µA test current, with ±2 % tolerance, 300 mW total power dissipation, and 80 Ω differential resistance at 5 mA - optimized for portable battery-powered sensors and IoT node power rails.
For engineers reviewing the BZX38450-C68X datasheet, BZX38450-C68X pinout, BZX38450-C68X application, or BZX38450-C68X equivalent, key selection criteria include its low 50 µA regulation current, tight ±2 % tolerance, SOD323 footprint compatibility, and intentional leakage behavior for noise reduction per AN90031.
Technical Context
This Zener diode operates in reverse breakdown mode with a specified working voltage of 6.8 V (min 6.46 V, max 7.14 V) at IZ = 50 µA. Its differential resistance is 80 Ω at 5 mA, and temperature coefficient is +1.2 mV/K - indicating positive drift over temperature, critical for stable reference design.
The device features intentionally elevated leakage current versus standard B-series parts (per AN90031), enabling faster transient response and reduced output noise in low-current regulation loops. Thermal resistance from junction to ambient is 415 K/W on FR4 PCB, limiting continuous power handling under still-air conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Regulation Voltage (VZ) | 6.8 V nominal at 50 µA; min 6.46 V / max 7.14 V - defines precision reference point for low-bias circuits |
| Tolerance | ±2 % - enables tighter system-level voltage margin control than ±5 % variants |
| Differential Resistance (rdiff) | 80 Ω at IZ = 5 mA - determines load regulation error and output impedance in shunt configuration |
| Forward Voltage (VF) | ≤ 0.9 V at IF = 10 mA - ensures minimal drop in series bias paths during startup or fault conditions |
| Total Power Dissipation (Ptot) | 300 mW at Tamb ≤ 25 °C on FR4 PCB - sets maximum steady-state power budget for thermal design |
| Reverse Current (IR) | ≤ 0.1 µA at VR = 5.1 V - confirms low leakage below knee voltage, critical for standby current budgets |
| Junction Temperature (Tj) | −55 °C to +150 °C - supports operation in extended industrial environments without derating |
Pinout & Package
SOD323 (SC-76) surface-mount plastic package: 1.7 mm × 1.25 mm × 0.95 mm body, 1.3 mm lead pitch, cathode marked by bar on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; polarity must be observed for correct reverse-bias operation |
| 2 | Anode (A) | Connected to ground or lower-potential rail; forms return path for Zener current |
Key Features
| Feature | Design Value |
|---|---|
| Low test current operation | Specified at 50 µA - enables regulation in µA-level bias networks common in battery-backed RTCs and sensor front-ends |
| Optimized leakage profile | Intentionally elevated IR vs. B-series (AN90031) - improves switching speed and reduces broadband noise in reference paths |
| Tight voltage tolerance | ±2 % - reduces need for post-regulation trimming in precision analog signal chains |
| Small-footprint packaging | SOD323 (1.7 × 1.25 mm) - supports high-density PCB layouts in space-constrained wearables and edge nodes |
Applications
| Portable Sensor Biasing | RTC Voltage Reference |
|---|---|
|
Use Scenario: Providing stable 6.8 V reference for MEMS accelerometer bias and ADC reference in coin-cell-powered environmental monitors. IC Role / Device Role / Timing Role: Shunt voltage regulator establishing precise analog operating point for signal conditioning circuitry. Use Value: Enables <1 µA quiescent current in sleep mode while maintaining ±0.1 % reference stability across −40 °C to +85 °C. |
Use Scenario: Supplying regulated voltage to real-time clock ICs (e.g., PCF8563) in smart meters with 10-year battery life requirements. IC Role / Device Role / Timing Role: Low-leakage Zener reference ensuring accurate oscillator bias and backup supply integrity. Use Value: Delivers <0.1 µA reverse leakage at 5.1 V, preserving battery capacity over decade-long deployments. |
| IoT Node Power Rail Clamping | Low-Power Microcontroller Reset Circuit |
|
Use Scenario: Clamping 3.3 V LDO output against transient surges in NB-IoT modem modules powered by Li-SOCl₂ cells. IC Role / Device Role / Timing Role: Overvoltage protection element absorbing short-duration energy spikes without latch-up. Use Value: Withstands 40 W non-repetitive peak reverse power (100 µs pulse), preventing downstream IC damage during ESD events. |
Use Scenario: Generating clean reset threshold voltage for ARM Cortex-M0+ microcontrollers in asset trackers. IC Role / Device Role / Timing Role: Precision voltage divider component setting Brown-Out Detection (BOD) trip point. Use Value: ±2 % tolerance ensures reset assertion within 3.23–3.37 V range, eliminating false resets during battery voltage sag. |
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-B6V8 | Same 6.8 V nominal, but ±5 % tolerance and lower leakage - no intentional fast-switching optimization | Lacks AN90031 leakage tuning; higher rdiff (160 Ω) degrades load regulation | Prefer when cost sensitivity outweighs noise or transient performance needs |
| MMSZ5234B | 6.8 V ±5 %, SOD-123 package (2.7 × 1.4 mm), 500 mW Ptot, rdiff = 10 Ω at 20 mA | Higher power rating but larger footprint; optimized for higher-current regulation, not µA-level bias | Choose only if board layout allows larger package and system requires >300 mW dissipation capability |
Compared with BZX38450-C68X, the BZX384-B6V8 sacrifices tolerance and noise performance for cost, while MMSZ5234B trades size and low-current fidelity for higher power handling - making the C68X uniquely suited for miniaturized, ultra-low-power reference designs.
Availability
BZX38450-C68X is available at Aetrix Electronics and suitable for portable sensor biasing, RTC voltage reference, and IoT node power rail clamping requiring stable component supply across extended temperature ranges and long-life battery applications.
Supply support for BZX38450-C68X 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 leading global semiconductor manufacturer headquartered in Nijmegen, Netherlands, specializing in high-performance, energy-efficient logic, discrete, and MOSFET solutions.
The BZX38450 series belongs to Nexperia's precision low-current Zener portfolio, engineered specifically for battery-powered and space-constrained applications demanding tight tolerance, low test current, and optimized noise behavior.
FAQ
What is the maximum continuous reverse power dissipation for BZX38450-C68X at 70 °C ambient?
At 70 °C ambient, derating applies: Ptot = 300 mW − [(70 − 25) × (300 mW / 415 K/W)] ≈ 268 mW. This accounts for thermal resistance of 415 K/W on FR4 PCB, ensuring junction temperature stays below 150 °C under steady-state operation.
Does BZX38450-C68X meet automotive AEC-Q200 requirements?
No. BZX38450-C68X is not AEC-Q200 qualified. The datasheet explicitly states it is a non-automotive qualified product, lacking stress testing and qualification for automotive temperature ranges, reliability, and failure mechanisms.
How does the "intentional minor rise of leakage current" improve performance?
Per AN90031, the elevated leakage in C-series devices reduces minority-carrier lifetime, enabling faster turn-on/turn-off transitions and lower broadband noise - critical for stable reference generation in high-resolution ADCs and low-phase-noise oscillators.
Can BZX38450-C68X be used in series with other Zeners to achieve higher reference voltages?
Yes, but with caution: series connection increases total differential resistance and temperature coefficient. For 13.6 V, two C68X units yield ~160 Ω rdiff and additive +2.4 mV/K TC - requiring careful thermal layout and load regulation analysis.
BZX38450-C68X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- 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-C68X FAQ
1.How can I place an order for BZX38450-C68X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX38450-C68X 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-C68X reliable?
The price and inventory of BZX38450-C68X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX38450-C68X is usually 5 days.
3.What payment methods are accepted for BZX38450-C68X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX38450-C68X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX38450-C68X?
BZX38450-C68X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX38450-C68X 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-C68X?
For technical support, including BZX38450-C68X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX38450-C68X requirements.
6.How does Aetrix verify that BZX38450-C68X is sourced from the original manufacturer or authorized distributors?
All BZX38450-C68X 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-C68X meets industry standards.
7.What is the process for return or replacement of BZX38450-C68X?
All BZX38450-C68X units undergo pre-shipment inspection (PSI). If there is an issue with BZX38450-C68X, 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-C68X part is unused and in its original packaging.
Return procedure for BZX38450-C68X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX38450-C68X Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
