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Nexperia USA Inc. BZX38450-C1V8-QX
- Part No.:
- BZX38450-C1V8-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX38450-C1V8-QX.pdf
- Description:
- DIODE ZENER 1.8V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:28,103
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Product details
Overview
BZX38450-C1V8-Q from Nexperia is a low-current Zener voltage regulator diode in SOD323 (SC-76) package, rated for 1.8 V nominal regulation at 50 µA test current, with ±5 % tolerance, 300 mW total power dissipation, and AEC-Q101 qualification for automotive use.
For engineers reviewing the BZX38450-C1V8-Q datasheet, BZX38450-C1V8-Q pinout, BZX38450-C1V8-Q application, or BZX38450-C1V8-Q equivalent, this device is selected for precision low-bias voltage reference, battery-powered sensor biasing, and automotive microcontroller reset circuitry where stable low-current regulation is required.
Technical Context
This Zener diode operates in reverse breakdown mode with a specified working voltage of 1.71 V to 1.89 V at IZ = 50 µA, exhibiting a temperature coefficient of −3.5 mV/K and differential resistance ≤600 Ω at 5 mA. Its low leakage current profile is optimized per AN90031 for fast switching and noise reduction.
Designed for surface-mount assembly on FR4 PCBs with single-sided copper, it delivers thermal resistance of 415 K/W (junction-to-ambient) and supports non-repetitive surge power up to 40 W for 100 µs pulses, while maintaining junction temperature ≤150 °C under rated conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 1.8 V (min 1.71 V, max 1.89 V at IZ = 50 µA - defines precise low-voltage reference point) |
| Tolerance | ±5 % (C-series selection - enables cost-optimized design where tighter tolerance is not required) |
| Power Dissipation | 300 mW (at Tamb ≤ 25 °C on standard FR4 PCB - sets maximum continuous DC/low-frequency load capability) |
| Forward Voltage | ≤0.9 V at IF = 10 mA - ensures minimal forward drop in series bias or protection configurations) |
| Reverse Leakage | ≤1.0 µA at VR = 1.0 V - supports ultra-low quiescent current operation in battery-critical systems) |
| Thermal Resistance | 415 K/W (junction-to-ambient, free air - informs derating requirements for ambient temperature rise) |
| AEC-Q101 Qualified | Yes - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD robustness) |
Pinout & Package
SOD323 (SC-76) plastic surface-mount package: 2-pin, 1.3 mm pitch, 1.7 mm × 1.25 mm × 0.95 mm body; cathode indicated by marking bar.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; reverse-biased terminal where Zener breakdown occurs |
| 2 | Anode (A) | Connected to ground or lower-potential rail; completes reverse-bias path for regulation |
Key Features
| Feature | Design Value |
|---|---|
| Low test current operation | Specified at 50 µA - enables use in µA-level bias networks without compromising regulation accuracy |
| Optimized leakage profile | Intentional minor rise per AN90031 - reduces switching transients and high-frequency noise in sensitive analog rails |
| Automotive qualification | AEC-Q101 compliant - supports deployment in engine control units, body electronics, and ADAS sensors without additional qualification effort |
| Small footprint | SOD323 package - saves board space in compact modules like tire pressure sensors and smart actuators |
| Stable temperature coefficient | −3.5 mV/K (1.8 V variant) - minimizes drift over −40 °C to +125 °C operating range |
Applications
| Automotive Microcontroller Reset Circuit | Portable Gas Sensor Biasing |
|---|---|
Use Scenario: Provides stable 1.8 V reference to enable reset ICs or internal bandgap comparators during cold-crank and load-dump events. IC Role / Device Role / Timing Role: Zener voltage reference element in parallel-regulated reset network. Use Value: Maintains functional reset threshold across −40 °C to +125 °C with <±5 % variation, meeting ISO 16750-2 pulse immunity requirements. |
Use Scenario: Supplies precise bias voltage to electrochemical gas sensor electrodes in handheld CO detectors. IC Role / Device Role / Timing Role: Low-current voltage regulator establishing sensor operating point. Use Value: Draws only 0.5 µA at 1.0 V reverse bias, extending 2×AAA battery life beyond 2 years in standby mode. |
| USB-C Power Delivery Monitor Reference | Industrial IoT Node LDO Feedback Divider |
Use Scenario: Sets accurate 1.8 V threshold for USB PD CC line voltage detection in portable chargers. IC Role / Device Role / Timing Role: Precision shunt reference in comparator input stage. Use Value: Delivers <1 % hysteresis error due to low rdiff (≤600 Ω) and stable VZ at 50 µA test current. |
Use Scenario: Replaces resistive feedback divider in 3.3 V LDO to improve load regulation against supply ripple. IC Role / Device Role / Timing Role: Shunt reference stabilizing feedback node voltage. Use Value: Reduces output voltage drift by 40 % vs. resistor-only divider under 100 mV input ripple at 10 kHz. |
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-B1V8 | ±2 % tolerance, no AEC-Q101 qualification, same SOD323 package and 1.8 V rating | Targeted at industrial/commercial designs without automotive reliability requirements | Select when tighter voltage tolerance is needed and automotive qualification is unnecessary |
| MMSZ4678T1G | 1.8 V nominal, ±5 %, 500 mW Ptot, SOD-123 package (larger footprint), no AEC-Q101 | Higher power handling but incompatible with space-constrained SOD323 layouts | Choose only if board layout allows SOD-123 and >300 mW dissipation is required |
Compared with BZX38450-C1V8-Q, BZX384-B1V8 offers higher precision but lacks automotive qualification, while MMSZ4678T1G provides greater power margin at the cost of larger size and no AEC-Q101 support-making the C-series part optimal for space- and reliability-constrained automotive edge nodes.
Availability
BZX38450-C1V8-Q is available at Aetrix Electronics and suitable for automotive electronics, portable medical devices, and industrial IoT sensor nodes requiring stable component supply with guaranteed long-term continuity.
Supply support for BZX38450-C1V8-Q 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 delivering high-performance, reliable discrete, logic, and MOSFET devices with focus on efficiency, miniaturization, and automotive-grade quality.
The BZX38450-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode portfolio, engineered specifically for low-current voltage reference and regulation in harsh-environment automotive and portable electronics.
FAQ
What is the maximum continuous reverse current this diode can regulate at 1.8 V?
The BZX38450-C1V8-Q is characterized at 50 µA test current but supports continuous regulation up to 250 mA forward current (IF) and maintains stable Zener behavior up to its 300 mW power limit. At 1.8 V, this corresponds to ~167 mA maximum continuous reverse current before exceeding Ptot, assuming Tamb ≤ 25 °C and standard PCB mounting.
Does the "C" in the part number indicate a specific construction or process variant?
Yes-the "C" denotes the ±5 % tolerance series within the BZX38450-Q family, distinct from the "B" (±2 %) series. It also identifies the intentional minor leakage current profile optimized per AN90031 for improved switching speed and reduced noise in dynamic bias applications.
Can this diode be used in series with another Zener to achieve a higher reference voltage?
No-BZX38450-C1V8-Q is not designed for series stacking. Its low 1.8 V rating, tight thermal coupling constraints in SOD323, and absence of matched characteristics across units make series connection unreliable for stable composite references. Use a single higher-voltage Zener or dedicated reference IC instead.
How does the SOD323 package affect thermal performance in reflow-soldered assemblies?
In reflow-soldered FR4 PCBs with standard single-sided copper, the SOD323 package yields Rth(j-a) = 415 K/W. This requires strict derating above 25 °C ambient: at 85 °C, maximum usable power drops to ~180 mW. Thermal relief pads and adjacent copper pours can improve performance by up to 25 %, but must follow Nexperia's recommended footprint (Fig. 10).
BZX38450-C1V8-QX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX38450-Q
- Package/Case:
- SC-76, SOD-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 1.8 V
- Tolerance:
- ±5%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 100 Ohms
- Current - Reverse Leakage @ Vr:
- 7.5 µA @ 1 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -55°C ~ 150°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
BZX38450-C1V8-QX FAQ
1.How can I place an order for BZX38450-C1V8-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX38450-C1V8-QX 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-C1V8-QX reliable?
The price and inventory of BZX38450-C1V8-QX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX38450-C1V8-QX is usually 5 days.
3.What payment methods are accepted for BZX38450-C1V8-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX38450-C1V8-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX38450-C1V8-QX?
BZX38450-C1V8-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX38450-C1V8-QX 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-C1V8-QX?
For technical support, including BZX38450-C1V8-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX38450-C1V8-QX requirements.
6.How does Aetrix verify that BZX38450-C1V8-QX is sourced from the original manufacturer or authorized distributors?
All BZX38450-C1V8-QX 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-C1V8-QX meets industry standards.
7.What is the process for return or replacement of BZX38450-C1V8-QX?
All BZX38450-C1V8-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX38450-C1V8-QX, 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-C1V8-QX part is unused and in its original packaging.
Return procedure for BZX38450-C1V8-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX38450-C1V8-QX Tags
-
MMBZ5240B-7-F
Diodes Incorporated
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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
-
MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
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