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Nexperia USA Inc. BZX38450-C56-QF
- Part No.:
- BZX38450-C56-QF
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX38450-C56-QF.pdf
- Description:
- DIODE ZENER 56V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:9,864
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Product details
Overview
BZX38450-C56-QF from Nexperia is a low-current Zener voltage regulator diode in SOD323 (SC-76) package, rated for 56 V nominal Zener voltage with ±5 % tolerance, 300 mW total power dissipation, and specified at 50 µA test current - optimized for low-bias, battery-powered regulation in automotive sensor interfaces and portable electronics.
For engineers reviewing the BZX38450-C56-QF datasheet, BZX38450-C56-QF pinout, BZX38450-C56-QF application, or BZX38450-C56-QF equivalent, key selection criteria include Zener voltage accuracy at microamp bias, thermal resistance (Rth(j-a) = 415 K/W), AEC-Q101 qualification, and cathode/anode terminal polarity for PCB layout verification.
Technical Context
This device operates as a two-terminal shunt voltage reference, maintaining stable reverse breakdown across 50 µA to 5 mA test currents. Its differential resistance is ≤ 400 Ω at IZ = 2 mA, and temperature coefficient is +0.05 mV/K near 56 V, enabling predictable drift in ambient ranges from −55 °C to +150 °C.
Designed for automotive-grade reliability, it meets AEC-Q101 stress requirements including high-temperature reverse bias, surge immunity (PZSM = 40 W, tp = 100 µs), and soldering robustness per JEDEC J-STD-020. The SOD323 footprint supports high-density PCB layouts with 1.3 mm lead pitch and 1.7 mm × 1.25 mm body size.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 56 V nominal, ±5 % tolerance - ensures stable reference under low-current bias without excessive power draw. |
| Test Current (IZ) | 50 µA - enables operation in ultra-low-power circuits such as battery-backed real-time clocks or sensor bias networks. |
| Total Power Dissipation (Ptot) | 300 mW at Tamb ≤ 25 °C - limits thermal rise on standard FR4 PCBs with single-sided copper. |
| Differential Resistance (rdiff) | ≤ 400 Ω at IZ = 2 mA - maintains tight regulation against load transients in feedback paths. |
| Junction-to-Ambient Thermal Resistance | 415 K/W - defines maximum allowable ambient temperature rise before reaching 150 °C junction limit. |
| Reverse Leakage (IR) | ≤ 0.05 µA at VR = 0.7 × VZ - minimizes standby current in always-on automotive subsystems. |
| AEC-Q101 Qualified | Yes - validated for automotive applications including engine control modules and body electronics. |
Pinout & Package
Package: SOD323 (SC-76), surface-mounted plastic package; 2 leads; 1.3 mm pitch; 1.7 mm × 1.25 mm × 0.95 mm body; marking bar denotes cathode.
| 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 shunt regulation path. |
Key Features
| Feature | Design Value |
|---|---|
| Low test current operation | Specified at 50 µA - reduces quiescent current in energy-sensitive systems like tire pressure sensors. |
| Automotive qualification | AEC-Q101 compliant - supports deployment in under-hood and cabin ECUs without additional qualification effort. |
| Controlled leakage profile | Intentional minor leakage rise per AN90031 - improves switching speed and noise rejection in dynamic bias networks. |
| Small-outline packaging | SOD323 footprint - enables placement in space-constrained modules such as LIN transceiver assemblies or LED driver ICs. |
Applications
| Automotive Cabin Sensors | Portable Medical Monitors |
|---|---|
|
Use Scenario: Voltage reference for analog front-end of seat occupancy or HVAC humidity sensors in passenger compartment. IC Role / Device Role / Timing Role: Shunt regulator providing stable 56 V bias to op-amp input stages and ADC reference dividers. Use Value: Maintains signal integrity across −40 °C to +85 °C ambient while drawing <1 µA standby current. |
Use Scenario: Low-power voltage clamp in battery-operated pulse oximeter analog signal chain. IC Role / Device Role / Timing Role: Overvoltage protection and rail stabilization for photodiode transimpedance amplifier supply. Use Value: Prevents saturation during transient ESD events while adding <0.1 µA to system quiescent load. |
| Industrial IoT Edge Nodes | Smart Meter Auxiliary Power |
|
Use Scenario: Reference generation for isolated RS-485 transceiver bias in wireless sensor gateways. IC Role / Device Role / Timing Role: Precision Zener element in discrete DC-DC feedback loop for isolated auxiliary rail. Use Value: Delivers ±2.8 V regulation error over 10-year field life with no derating below 50 µA operating point. |
Use Scenario: Secondary voltage clamp in meter's PLC communication module powered from mains-derived 60 V rail. IC Role / Device Role / Timing Role: Transient suppressor and steady-state regulator for MCU I/O protection circuitry. Use Value: Withstands 40 W non-repetitive surges per IEC 61000-4-5 while holding clamping voltage within 5 % of 56 V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX384-C56 | Same Zener voltage and SOD323 package but lacks AEC-Q101 qualification and has ±10 % tolerance. | Restricted to commercial-grade consumer electronics; not suitable for automotive or industrial safety-critical functions. | Select only when cost sensitivity outweighs automotive compliance and tighter voltage tolerance requirements. |
| MMSZ5256ET1G | 56 V Zener, ±5 %, SOD-123 package; higher Ptot = 500 mW but Rth(j-a) = 460 K/W and no AEC-Q101 rating. | Acceptable for non-automotive industrial use where board space allows larger footprint and thermal margin is relaxed. | Prefer when higher surge capability is needed but automotive qualification and minimal footprint are not required. |
Compared with BZX38450-C56-QF, BZX384-C56 sacrifices automotive qualification and precision for lower cost, while MMSZ5256ET1G trades package compactness and AEC-Q101 compliance for greater power handling - making the QF variant uniquely suited for space- and reliability-constrained automotive subsystems.
Availability
BZX38450-C56-QF is available at Aetrix Electronics and suitable for automotive cabin electronics, portable medical instrumentation, and industrial IoT edge nodes requiring stable component supply with guaranteed long-term continuity.
Supply support for BZX38450-C56-QF 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 logic, discrete, and MOSFET devices, headquartered in Nijmegen, Netherlands.
The BZX38450-Q series belongs to Nexperia's automotive-qualified Zener diode product line, engineered specifically for low-current, high-stability voltage regulation in harsh-environment electronic control units.
FAQ
What is the maximum reverse surge power the BZX38450-C56-QF can withstand?
The device supports non-repetitive peak reverse power dissipation of 40 W at tp = 100 µs, per IEC 60134 absolute maximum ratings. This surge capability is validated under Tj = 25 °C pre-surge conditions and applies to transient overvoltage events such as load dump or ESD coupling in automotive wiring harnesses.
Does the BZX38450-C56-QF require a minimum bias current to maintain regulation accuracy?
Yes - regulation is specified at IZ = 50 µA, and voltage deviation increases significantly below this level. At 10 µA, VZ shifts up to +3.2 %; design must ensure ≥50 µA through the diode during active regulation to meet ±5 % tolerance.
How does the thermal resistance affect PCB layout for continuous operation?
With Rth(j-a) = 415 K/W on standard FR4, dissipating 300 mW raises junction temperature by ~125 K above ambient. To stay within 150 °C Tj, ambient must remain ≤ 25 °C unless enhanced copper pour or thermal vias reduce effective Rth.
Is the cathode marking consistent across all BZX38450-Q series variants?
Yes - all variants use a single bar marking on the SOD323 body to indicate the cathode (Pin 1), per Table 2 pinning information and Figure 9 package outline. This orientation is identical across B- and C-tolerance versions and verified in production marking samples.
BZX38450-C56-QF 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):
- 56 V
- Tolerance:
- ±5%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 200 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 39.2 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
BZX38450-C56-QF FAQ
1.How can I place an order for BZX38450-C56-QF through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX38450-C56-QF 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-C56-QF reliable?
The price and inventory of BZX38450-C56-QF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX38450-C56-QF is usually 5 days.
3.What payment methods are accepted for BZX38450-C56-QF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX38450-C56-QF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX38450-C56-QF?
BZX38450-C56-QF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX38450-C56-QF 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-C56-QF?
For technical support, including BZX38450-C56-QF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX38450-C56-QF requirements.
6.How does Aetrix verify that BZX38450-C56-QF is sourced from the original manufacturer or authorized distributors?
All BZX38450-C56-QF 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-C56-QF meets industry standards.
7.What is the process for return or replacement of BZX38450-C56-QF?
All BZX38450-C56-QF units undergo pre-shipment inspection (PSI). If there is an issue with BZX38450-C56-QF, 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-C56-QF part is unused and in its original packaging.
Return procedure for BZX38450-C56-QF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX38450-C56-QF Tags
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MMBZ5240B-7-F
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
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BZX84C3V3LT1G
onsemi
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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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