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Nexperia USA Inc. BZX38450-C11-QX
- Part No.:
- BZX38450-C11-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX38450-C11-QX.pdf
- Description:
- DIODE ZENER 11V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
BZX38450-C11-Q from Nexperia is a low-current Zener voltage regulator diode in SOD323 (SC-76) package, rated for 11 V nominal regulation at 50 µA test current, with ±5 % tolerance, 300 mW power dissipation, and AEC-Q101 qualification for automotive use.
For engineers reviewing the BZX38450-C11-Q datasheet, BZX38450-C11-Q pinout, BZX38450-C11-Q application, or BZX38450-C11-Q equivalent, this part serves as a precision low-bias voltage reference in battery-powered sensor interfaces, ECU voltage monitoring circuits, and automotive infotainment power rail clamping where stable 11 V regulation at microamp-level currents is required.
Technical Context
This Zener diode operates in reverse breakdown mode with a specified working voltage of 10.45 V to 11.55 V at IZ = 50 µA, exhibiting a differential resistance ≤150 Ω at 5 mA and a temperature coefficient of +5.4 mV/K. Its intentional minor leakage rise improves switching speed and noise performance per AN90031.
Designed for low-power biasing, it delivers stable regulation under ambient temperatures from −55 °C to +150 °C, with thermal resistance from junction to ambient of 415 K/W on FR4 PCB and junction-to-solder-point of 110 K/W - enabling reliable operation in thermally constrained automotive modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 11 V (10.45–11.55 V range at 50 µA; enables precise 11 V reference in low-current sensing) |
| Tolerance | ±5 % (C-series grade; supports cost-optimized designs where tighter tolerance is not required) |
| Power Dissipation | 300 mW (max at Tamb ≤ 25 °C; sufficient for standby regulation without heatsinking) |
| Test Current | 50 µA (low bias point; ideal for battery-critical applications like keyless entry receivers) |
| Differential Resistance | ≤150 Ω at 5 mA (ensures minimal voltage shift under small load variations in feedback networks) |
| Reverse Leakage | ≤0.05 µA at VR = 8.4 V (ultra-low standby current preserves battery life in always-on modules) |
| Junction Temperature | 150 °C max (supports under-hood placement in engine control units and body controllers) |
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, cathode marked by bar on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; marking bar identifies this terminal for correct PCB orientation |
| 2 | Anode (A) | Connected to ground or lower-potential rail; completes reverse-bias path for Zener operation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per JESD22 |
| Low test current operation | Specified at 50 µA - reduces quiescent current in always-on vehicle subsystems by >90 % vs. standard 5 mA Zeners |
| Optimized leakage profile | Intentional minor IR rise (per AN90031) lowers switching transients and high-frequency noise in ADC reference paths |
| Thermal robustness | Rth(j-sp) = 110 K/W enables direct solder-point thermal coupling to PCB copper, improving long-term stability in hot environments |
Applications
| Automotive Body Control Module (BCM) | Portable Tire Pressure Monitoring System (TPMS) |
|---|---|
Use Scenario: Voltage reference for microcontroller ADC measuring 12 V battery rail fluctuations during cold cranking. IC Role / Device Role / Timing Role: Zener regulator providing stable 11 V reference to ADC input divider network. Use Value: Maintains <±1 % reference accuracy across −40 °C to +125 °C while drawing only 50 µA, extending TPMS battery life beyond 10 years. |
Use Scenario: Clamping protection for LIN bus transceiver supply rail against load-dump transients. IC Role / Device Role / Timing Role: Low-leakage Zener shunt limiting voltage to 11.6 V peak during 100 ms surges. Use Value: Prevents transceiver latch-up without triggering overcurrent shutdown, due to 0.05 µA leakage at 8.4 V and 40 W non-repetitive surge capability. |
| Infotainment System Power Sequencing | Electric Power Steering (EPS) Sensor Biasing |
Use Scenario: Enabling controlled startup of display backlight driver IC via regulated enable threshold. IC Role / Device Role / Timing Role: Zener-based voltage detector generating clean 11 V logic-high signal when main 12 V rail stabilizes. Use Value: Eliminates need for dedicated supervisor IC; achieves <10 µs response time with 150 Ω rdiff and 85 pF capacitance. |
Use Scenario: Providing excitation voltage to Hall-effect position sensors in EPS motor feedback loop. IC Role / Device Role / Timing Role: Low-noise 11 V bias source decoupled from noisy motor drive rails. Use Value: Reduces position error by 0.15° over full temperature range due to +5.4 mV/K TC and optimized leakage behavior. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX38450-B11-Q | ±2 % tolerance (vs. ±5 %); higher cost; identical package, pinout, and thermal specs | Required where 11 V reference stability must stay within ±0.22 V over temperature and life | Select when ADC reference accuracy dominates BOM cost sensitivity |
| MMSZ5240B-7-F | ±5 % tolerance; 500 mW Ptot; SOD-123 package; 100 Ω rdiff at 20 mA; no AEC-Q101 qualification | Suitable for industrial power supplies but not automotive under-hood use | Choose only for non-automotive, higher-power, non-qualified applications needing lower dynamic impedance |
Compared with BZX38450-C11-Q, the B11-Q variant offers tighter voltage control at higher cost, while MMSZ5240B-7-F trades automotive qualification and low-bias optimization for higher power handling and broader industrial availability - making the C11-Q optimal for cost-sensitive, AEC-compliant, ultra-low-current automotive regulation.
Availability
BZX38450-C11-Q is available at Aetrix Electronics and suitable for automotive electronics, battery-powered sensor nodes, and precision voltage reference circuits requiring stable component supply with guaranteed AEC-Q101 compliance and traceable lot history.
Supply support for BZX38450-C11-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 regulator portfolio, engineered specifically for low-current, low-noise voltage reference and clamping in automotive ECUs, ADAS sensors, and body electronics.
FAQ
What is the maximum reverse voltage this diode can withstand before breakdown?
The BZX38450-C11-Q has a nominal Zener voltage of 11 V, with a guaranteed working range of 10.45 V to 11.55 V at 50 µA. Its absolute maximum non-repetitive peak reverse voltage is defined by the 40 W surge rating at 100 µs pulse width - corresponding to ~12.6 V at 3.17 A peak current. Continuous operation above 11.55 V risks thermal runaway.
Does this Zener diode require a series current-limiting resistor in all applications?
Yes - a series resistor is mandatory to limit reverse current to within the 300 mW power dissipation limit and prevent thermal damage. For example, at 12 V supply and 11 V Zener voltage, a minimum 20 Ω resistor limits current to 50 mA (600 mW), exceeding rating; a 220 Ω resistor restricts current to 4.5 mA (50 mW), ensuring safe continuous operation.
How does the "C" suffix differ from "B" in the BZX38450-Q series?
The "C" suffix denotes ±5 % voltage tolerance and an intentional minor increase in reverse leakage current - optimized per AN90031 for faster transient response and reduced high-frequency noise in precision analog circuits. The "B" suffix indicates ±2 % tolerance and lower leakage, suited for highest-accuracy references where noise is secondary.
Can this device be used in forward-bias mode as a standard rectifier diode?
No - the BZX38450-C11-Q is optimized for reverse-bias Zener operation. Its forward voltage is 0.9 V at 10 mA, but its structure lacks the surge current rating, soft recovery, or low VF optimization of dedicated rectifiers. Using it forward-biased risks premature failure under repetitive conduction or reverse recovery stress.
BZX38450-C11-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:
- Discontinued at Digi-Key
- Voltage - Zener (Nom) (Vz):
- 11 V
- Tolerance:
- ±5%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 20 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 8.4 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-C11-QX FAQ
1.How can I place an order for BZX38450-C11-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX38450-C11-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-C11-QX reliable?
The price and inventory of BZX38450-C11-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-C11-QX is usually 5 days.
3.What payment methods are accepted for BZX38450-C11-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX38450-C11-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX38450-C11-QX?
BZX38450-C11-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX38450-C11-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-C11-QX?
For technical support, including BZX38450-C11-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX38450-C11-QX requirements.
6.How does Aetrix verify that BZX38450-C11-QX is sourced from the original manufacturer or authorized distributors?
All BZX38450-C11-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-C11-QX meets industry standards.
7.What is the process for return or replacement of BZX38450-C11-QX?
All BZX38450-C11-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX38450-C11-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-C11-QX part is unused and in its original packaging.
Return procedure for BZX38450-C11-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX38450-C11-QX Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
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BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
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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