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Nexperia USA Inc. BZX38450-B12X
- Part No.:
- BZX38450-B12X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX38450-B12X.pdf
- Description:
- DIODE ZENER 12V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:9,472
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Product details
Overview
BZX38450-B12X 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 12 V regulation at 50 µA test current, with ±2 % tolerance, 150 Ω typical differential resistance at 5 mA, and 9.1 V reverse breakdown voltage at 5 mA. It is used in battery-powered sensor nodes requiring stable reference under microampere quiescent conditions.
For engineers reviewing the BZX38450-B12X datasheet, BZX38450-B12X pinout, BZX38450-B12X application, or BZX38450-B12X equivalent, key selection criteria include low-test-current regulation accuracy, thermal stability (SZ = +6.0 mV/K), SOD323 footprint compatibility, and leakage performance in standby mode.
Technical Context
This Zener diode operates in reverse-bias breakdown mode with a specified working voltage of 11.8–12.2 V at IZ = 50 µA, and maintains regulation down to 0.05 µA reverse current. Its differential resistance drops from 150 Ω at 50 µA to 25 Ω at 5 mA, supporting both precision reference and moderate-current shunt regulation.
The device features an intentional minor rise in leakage current per AN90031 to improve switching speed and reduce noise-critical for analog front-end biasing in portable instrumentation. Junction-to-ambient thermal resistance is 415 K/W on FR4 PCB, limiting continuous power dissipation to 300 mW at Tamb ≤ 25 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Regulation Voltage (VZ) | 11.8–12.2 V at IZ = 50 µA - enables accurate low-bias reference without load-dependent drift |
| Tolerance | ±2 % (B-series) - supports tight-voltage-margin designs in precision analog signal chains |
| Differential Resistance (rdiff) | 150 Ω max at IZ = 50 µA; 25 Ω typ at IZ = 5 mA - ensures stable output under varying load current |
| Temperature Coefficient (SZ) | +6.0 mV/K - provides predictable, positive VZ drift over temperature for compensated references |
| Forward Voltage (VF) | ≤ 0.9 V at IF = 10 mA - allows use as low-drop rectifier or clamp in dual-role circuits |
| Power Dissipation (Ptot) | 300 mW max at Tamb ≤ 25 °C on FR4 PCB - defines safe operating area for compact PCB layouts |
| Junction Temperature (Tj) | −55 to +150 °C - supports industrial and extended-temperature embedded applications |
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 (K) | Cathode | Connected to regulated output node; marking bar identifies this terminal for correct PCB orientation |
| 2 (A) | Anode | Connected to ground or lower-potential rail; completes reverse-bias path for Zener operation |
Key Features
| Feature | Design Value |
|---|---|
| Low test current operation | Specified at 50 µA - minimizes quiescent current draw in always-on battery systems |
| Optimized leakage profile | Intentional minor IR rise per AN90031 - reduces switching transients and broadband noise in sensitive analog stages |
| Stable thermal coefficient | +6.0 mV/K at 12 V - enables predictable temperature compensation in reference ladder networks |
| Small-footprint SMD package | SOD323 outline with 1.3 mm pitch - fits high-density layouts in wearables and IoT edge nodes |
| Robust surge rating | 40 W non-repetitive peak reverse power (100 µs pulse) - withstands ESD and transient events without degradation |
Applications
| Portable Sensor Biasing | Low-Power ADC Reference |
|---|---|
Use Scenario: Powering MEMS accelerometers and temperature sensors in coin-cell–powered asset trackers. IC Role / Device Role / Timing Role: Zener shunt regulator providing stable 12 V bias to sensor analog front-end and internal LDO input. Use Value: Enables <1 µA sleep-mode current while maintaining ±0.24 V regulation window across −40 to +85 °C. |
Use Scenario: Supplying reference voltage to 12-bit SAR ADCs in handheld multimeters. IC Role / Device Role / Timing Role: Precision voltage reference source replacing larger TO-92 Zeners in space-constrained meter PCBs. Use Value: Delivers 12 V ±0.24 V at 50 µA, reducing reference error contribution to <0.02 LSB over full temperature range. |
| IoT Node Voltage Clamp | Microcontroller Reset Circuit |
Use Scenario: Clamping 12 V supply rail against surges in LoRaWAN end-node gateways. IC Role / Device Role / Timing Role: Transient voltage suppressor placed between VCC and GND, leveraging fast leakage response per AN90031. Use Value: Limits overvoltage to <13.5 V during 100 µs pulses without latch-up, preserving MCU integrity. |
Use Scenario: Generating clean reset threshold for ARM Cortex-M0+ MCUs in smart lighting controllers. IC Role / Device Role / Timing Role: Regulated voltage source feeding RC network into dedicated reset supervisor IC. Use Value: Ensures reset assertion at precisely 11.8 V during brown-out, eliminating false triggers from ripple or noise. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor MMBZ5242B | 12 V, ±5 % tolerance, 100 Ω rdiff at 20 mA, SOD-123 package | Higher test current (20 mA) and looser tolerance - less suitable for µA-biased references | Select when cost sensitivity outweighs precision; verify layout compatibility with larger SOD-123 footprint |
| Vishay BZX384-C12 | 12 V, ±5 % tolerance, same SOD323 package, higher leakage (0.1 µA vs. 0.05 µA) | Lower regulation accuracy and elevated IR - acceptable for non-critical bias but not metrology-grade references | Choose only if ±5 % tolerance satisfies system margin; avoid where temperature-compensated stability is required |
Compared with MMBZ5242B and BZX384-C12, BZX38450-B12X offers tighter ±2 % tolerance, lower 50 µA test current, and optimized leakage for noise-sensitive analog use-making it the preferred choice for precision low-power voltage references rather than general-purpose clamping.
Availability
BZX38450-B12X is available at Aetrix Electronics and suitable for portable sensor biasing, low-power ADC reference design, and IoT node voltage clamping requiring stable component supply across industrial temperature ranges and long-lifecycle production programs.
Supply support for BZX38450-B12X 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 and industrial-grade components.
The BZX38450 series belongs to Nexperia's low-current Zener regulator product line, engineered specifically for ultra-low-quiescent-current voltage reference and biasing in battery-powered and space-constrained electronics.
FAQ
What is the maximum continuous reverse current the BZX38450-B12X can sustain without exceeding its 300 mW power limit?
At 12 V regulation, the absolute maximum continuous reverse current is 25 mA (300 mW ÷ 12 V), assuming ambient temperature ≤25 °C on standard FR4 PCB. Derating applies above 25 °C per Rth(j-a) = 415 K/W; at 70 °C ambient, max IZ drops to ~15 mA to maintain junction temperature below 150 °C.
How does the "intentional minor rise of leakage current" affect circuit behavior in precision applications?
This controlled leakage increase (per AN90031) reduces minority-carrier storage time, improving turn-off speed and lowering broadband noise-particularly beneficial in op-amp bias networks and ADC reference buffers. It does not degrade DC regulation accuracy at 50 µA, which remains within ±2 %.
Can BZX38450-B12X be used in forward conduction mode, and what is its typical forward voltage?
Yes-it functions as a standard silicon diode in forward bias. At IF = 10 mA, VF is ≤0.9 V (pulse-tested), making it suitable for low-drop clamping or polarity protection. Forward conduction is not its primary function, but the parameter is fully characterized and usable in dual-role designs.
Is the SOD323 package of BZX38450-B12X compatible with standard reflow soldering profiles for lead-free assembly?
Yes-Nexperia specifies compatibility with JEDEC J-STD-020D reflow profiles. The recommended footprint (Fig. 10) uses 0.5 mm × 0.6 mm solder lands with 0.6 mm solder resist opening, supporting peak temperatures up to 260 °C for ≤30 seconds. Thermal mass is low, enabling reliable joint formation without tombstoning.
BZX38450-B12X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX38450
- Package/Case:
- SC-76, SOD-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 12 V
- Tolerance:
- ±2%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 25 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 9.1 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-B12X FAQ
1.How can I place an order for BZX38450-B12X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX38450-B12X 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-B12X reliable?
The price and inventory of BZX38450-B12X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX38450-B12X is usually 5 days.
3.What payment methods are accepted for BZX38450-B12X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX38450-B12X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX38450-B12X?
BZX38450-B12X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX38450-B12X 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-B12X?
For technical support, including BZX38450-B12X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX38450-B12X requirements.
6.How does Aetrix verify that BZX38450-B12X is sourced from the original manufacturer or authorized distributors?
All BZX38450-B12X 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-B12X meets industry standards.
7.What is the process for return or replacement of BZX38450-B12X?
All BZX38450-B12X units undergo pre-shipment inspection (PSI). If there is an issue with BZX38450-B12X, 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-B12X part is unused and in its original packaging.
Return procedure for BZX38450-B12X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX38450-B12X Tags
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