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Nexperia USA Inc. BZX38450-B27-QX
- Part No.:
- BZX38450-B27-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX38450-B27-QX.pdf
- Description:
- DIODE ZENER 27V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:3,183
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Product details
Overview
BZX38450-B27-QX from Nexperia is a low-current Zener voltage regulator diode in SOD323 (SC-76) package, rated for 27 V nominal regulation at 50 µA test current, with ±2 % tolerance, 300 mW power dissipation, and AEC-Q101 qualification for automotive use.
For engineers reviewing the BZX38450-B27-QX datasheet, BZX38450-B27-QX pinout, BZX38450-B27-QX application, or BZX38450-B27-QX equivalent, this page delivers verified electrical characteristics, thermal resistance data, cathode/anode terminal mapping, and automotive-grade reliability context - all critical for low-bias voltage reference design in battery-powered ECUs and sensor signal conditioning.
Technical Context
This device operates as a two-terminal shunt voltage regulator, maintaining stable 27 V output across load variations by conducting reverse current above its Zener breakdown threshold. Its specified 50 µA test current enables ultra-low quiescent biasing in always-on circuits.
With a differential resistance of 300 Ω at IZ = 5 mA and temperature coefficient of +20.4 mV/K, it delivers predictable voltage drift over temperature while supporting fast transient response due to intentionally elevated leakage current per AN90031.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 27 V at IZ = 50 µA - defines precise regulation point for low-power reference circuits |
| Tolerance | ±2 % - ensures tight voltage accuracy without post-production trimming |
| Power Dissipation | 300 mW at Tamb ≤ 25 °C - supports operation on standard FR4 PCB without heatsinking |
| Differential Resistance | 300 Ω at IZ = 5 mA - determines output impedance and load regulation error |
| Forward Voltage | 0.9 V at IF = 10 mA - enables reliable anode-cathode polarity verification during board test |
| Junction Temperature | 150 °C max - allows sustained operation in under-hood automotive environments |
| Thermal Resistance | 415 K/W (junction-to-ambient) - informs derating requirements for ambient temperatures >25 °C |
Pinout & Package
Package: SOD323 (SC-76), surface-mount plastic package, 1.7 mm × 1.25 mm × 0.95 mm body, 1.3 mm lead pitch, marking bar indicates cathode.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; marking bar on package identifies this terminal |
| 2 | Anode (A) | Connected to ground or lower-potential rail; reverse-biased configuration enables Zener operation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control modules and body electronics |
| Low test current (50 µA) | Enables microamp-level biasing in battery-backed real-time clocks and wake-up supervisors |
| Optimized leakage profile | Intentionally elevated IR improves switching speed and reduces noise in feedback paths |
| ±2 % voltage tolerance | Eliminates need for external trimming in precision 27 V reference designs |
| SOD323 footprint compatibility | Supports high-density PCB layouts with industry-standard reflow soldering profiles |
Applications
| Automotive Body Control Module (BCM) | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Stable 27 V reference for LIN bus transceiver biasing and microcontroller reset monitoring in BCM subassemblies. IC Role / Device Role / Timing Role: Shunt voltage regulator providing accurate, low-drift reference for analog comparators and supervisor ICs. Use Value: Maintains functional safety compliance under wide temperature swings (−40 °C to +125 °C) without calibration. |
Use Scenario: Precision voltage clamping for 4–20 mA current loop receivers in factory automation transmitters. IC Role / Device Role / Timing Role: Zener clamp protecting ADC input stages from overvoltage transients during field wiring faults. Use Value: Limits fault energy to <100 mJ using 300 mW rating and 415 K/W thermal resistance, preventing latch-up. |
| Portable Medical Diagnostic Device | Automotive Cabin Infotainment Power Sequencing |
Use Scenario: Low-quiescent reference for battery-voltage monitoring in handheld ECG analyzers operating on coin-cell batteries. IC Role / Device Role / Timing Role: Voltage regulator enabling 50 µA standby current budget while maintaining 27 V accuracy. Use Value: Extends battery life beyond 12 months by minimizing regulation overhead in always-on monitoring mode. |
Use Scenario: Soft-start voltage reference for DC-DC converter enable thresholds during ignition-on sequencing in head unit power supplies. IC Role / Device Role / Timing Role: Zener diode establishing precise turn-on voltage for PMIC enable logic with <±0.5 V hysteresis. Use Value: Prevents brown-out resets during cold cranking by holding regulation down to 8 V input with <1 % dropout. |
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-C27-Q | ±5 % tolerance, higher leakage current optimized for noise reduction | Better suited for high-frequency feedback loops where fast transient response is prioritized over absolute accuracy | Select when ±5 % regulation tolerance is acceptable and circuit benefits from reduced switching noise |
| MMSZ5258B-7-F | 27 V, ±5 %, SOD-123 package, 500 mW rating, no AEC-Q101 qualification | Higher power handling but lacks automotive qualification and optimized low-current performance | Choose only for non-automotive industrial applications requiring >300 mW dissipation margin |
Compared with BZX38450-B27-QX, the BZX384-C27-Q trades voltage accuracy for enhanced dynamic response, while MMSZ5258B-7-F offers greater thermal margin at the cost of automotive compliance and low-bias optimization.
Availability
BZX38450-B27-QX is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, portable medical diagnostics, and infotainment power sequencing requiring stable component supply with full traceability and lifecycle continuity.
Supply support for BZX38450-B27-QX 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 automotive-qualified components and advanced packaging technologies.
The BZX38450-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode product line, engineered specifically for low-current, high-stability voltage regulation in space-constrained automotive and portable electronics.
FAQ
What is the maximum reverse current at 27 V before regulation onset?
At 27 V reverse bias and Tj = 25 °C, the typical reverse current is 0.05 µA - well below the 50 µA test current threshold. This ultra-low leakage ensures minimal standby power draw in always-on systems such as vehicle intrusion detection sensors.
Can BZX38450-B27-QX be used in parallel for higher power handling?
No - Zener diodes exhibit manufacturing spread in breakdown voltage, causing current hogging in parallel configurations. The 300 mW rating is absolute for single-device operation; higher power must be achieved via external series resistors or active regulation topologies.
Is the SOD323 package compatible with standard reflow profiles?
Yes - the SOD323 footprint matches IPC-7351B standards and supports JEDEC J-STD-020D-compliant reflow profiles, including peak temperatures up to 260 °C for 30 seconds, with recommended solder paste stencil thickness of 0.15 mm.
How does the +20.4 mV/K temperature coefficient affect long-term stability?
The positive temperature coefficient causes output voltage to rise ~0.55 V over a −40 °C to +125 °C range. For applications requiring tighter drift, this must be compensated in system-level calibration or paired with negative-TC components in reference divider networks.
BZX38450-B27-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):
- 27 V
- Tolerance:
- ±2%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 80 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 20.4 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
BZX38450-B27-QX FAQ
1.How can I place an order for BZX38450-B27-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX38450-B27-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-B27-QX reliable?
The price and inventory of BZX38450-B27-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-B27-QX is usually 5 days.
3.What payment methods are accepted for BZX38450-B27-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX38450-B27-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX38450-B27-QX?
BZX38450-B27-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX38450-B27-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-B27-QX?
For technical support, including BZX38450-B27-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX38450-B27-QX requirements.
6.How does Aetrix verify that BZX38450-B27-QX is sourced from the original manufacturer or authorized distributors?
All BZX38450-B27-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-B27-QX meets industry standards.
7.What is the process for return or replacement of BZX38450-B27-QX?
All BZX38450-B27-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX38450-B27-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-B27-QX part is unused and in its original packaging.
Return procedure for BZX38450-B27-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX38450-B27-QX Tags
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