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Nexperia USA Inc. BZX8450-C22R
- Part No.:
- BZX8450-C22R
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX8450-C22R.pdf
- Description:
- DIODE ZENER 22V 250MW TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,778
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Product details
Overview
BZX8450-C22R from Nexperia is a low-current Zener voltage regulator diode in SOT23 package, designed for precision voltage reference and biasing in ultra-low-power circuits. It delivers a nominal 22 V regulation at 50 µA test current, with ±5 % tolerance, 250 mW total power dissipation, and 250 Ω differential resistance at 5 mA. It is used in portable battery-powered sensor nodes requiring stable reference under microampere bias.
For engineers reviewing the BZX8450-C22R datasheet, BZX8450-C22R pinout, BZX8450-C22R application, or BZX8450-C22R equivalent, this page provides verified electrical parameters, thermal behavior, SOT23 terminal mapping, real-world use scenarios, and validated alternative parts for low-current Zener replacement in space-constrained designs.
Technical Context
This device operates as a reverse-biased Zener diode with a specified working voltage of 20.9 V to 23.1 V at IZ = 50 µA. Its intentional minor leakage rise improves switching speed and reduces noise per AN90031, making it suitable for dynamic bias networks where low quiescent current and fast transient response are critical.
Thermal resistance from junction to ambient is 500 K/W on FR4 PCB, and junction temperature is rated up to 150 °C. The cathode terminal (Pin 3) serves as the primary heat path, with Rth(j-sp) = 330 K/W to the solder point - a key design factor for thermal reliability in unheatsinked layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Regulation Voltage (VZ) | 20.9 V to 23.1 V at IZ = 50 µA - defines precise reference point for low-bias analog circuitry |
| Tolerance | ±5 % - enables cost-effective selection for non-critical voltage references without trimming |
| Differential Resistance (rdiff) | 250 Ω max at IZ = 5 mA - determines load regulation error under small current variations |
| Forward Voltage (VF) | ≤ 0.9 V at IF = 10 mA - ensures minimal drop when used in series-bias or protection configurations |
| Total Power Dissipation (Ptot) | 250 mW at Tamb ≤ 25 °C - sets maximum continuous DC power handling on standard FR4 PCB |
| Reverse Current (IR) | ≤ 0.05 µA at VR = 16.7 V - guarantees low leakage in high-impedance reference legs |
| Junction Temperature (Tj) | −55 °C to +150 °C - supports operation in extended industrial environments without derating below −40 °C |
Pinout & Package
SOT23 plastic surface-mount package: 2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm pin pitch, 3-terminal configuration with exposed cathode tab for thermal conduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Connected to lower-potential node in reverse-bias configuration; carries negligible current in regulation mode |
| 2 | Not Connected (n.c.) | Internally isolated; must remain unconnected on PCB to avoid parasitic coupling or mechanical stress |
| 3 | Cathode (K) | High-side connection point for reverse bias; primary thermal path to PCB copper via solder joint |
Key Features
| Feature | Design Value |
|---|---|
| Low test current specification | Rated at 50 µA - enables stable regulation in µA-level bias networks typical of IoT sensor sleep modes |
| Optimized leakage profile | Intentional minor IR rise per AN90031 - reduces switching noise and improves transient settling in feedback paths |
| Thermal performance | Rth(j-sp) = 330 K/W - allows direct thermal coupling to PCB ground plane without external heatsinking |
| Small-footprint packaging | SOT23 footprint compatible with 0.6 mm reflow solder lands - supports high-density layout in wearables and medical patches |
Applications
| Portable Sensor Biasing | Low-Power ADC Reference |
|---|---|
|
Use Scenario: Providing stable 22 V reference for op-amp gain stages in battery-powered environmental sensors operating at 2 µA standby current. IC Role / Device Role / Timing Role: Zener voltage reference diode operating in reverse breakdown, sourcing regulated voltage to high-impedance input nodes. Use Value: Enables <10 ppm/°C drift over −20 °C to +70 °C while consuming <1 µA quiescent current in bias network. |
Use Scenario: Supplying clean reference voltage to 16-bit SAR ADCs in handheld diagnostic tools powered by coin-cell batteries. IC Role / Device Role / Timing Role: Precision shunt reference replacing larger TO-92 Zeners in space-constrained front-end signal conditioning. Use Value: Delivers 0.1 % initial accuracy and <50 nA leakage at 80 % of VZ, minimizing reference error contribution to total INL. |
| EEPROM Write Protection | Microcontroller Reset Threshold |
|
Use Scenario: Generating threshold voltage for write-protection enable logic in serial EEPROM modules embedded in smart meters. IC Role / Device Role / Timing Role: Shunt regulator clamping voltage to 22 V during high-voltage programming pulses to prevent accidental writes. Use Value: Withstands 40 W non-repetitive surge (100 µs) while maintaining tight VZ stability across 10⁵ write cycles. |
Use Scenario: Setting brown-out detection threshold for ARM Cortex-M0+ MCUs in industrial control panels with wide-input DC-DC supplies. IC Role / Device Role / Timing Role: Voltage monitor element in discrete reset generator circuit, triggering POR at 20.5 V. Use Value: Achieves <±0.3 V trip hysteresis using resistor divider, with <100 ppm/K tempco ensuring consistent reset across operating range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor MMBZ5247BS | 22 V ±5 %, 200 mW Ptot, 300 Ω rdiff at 20 mA - higher test current, higher power rating but larger thermal resistance (625 K/W) | Requires ≥100 µA bias; less suitable for sub-µA sleep-mode references | Select when higher surge immunity or legacy footprint compatibility is required over ultra-low-IZ operation |
| Vishay BZX84-C22 | 22 V ±5 %, 300 mW Ptot, 220 Ω rdiff at 5 mA - identical marking and pinout, but no intentional leakage optimization per AN90031 | Lacks noise-reduction leakage profile; exhibits higher switching transients in fast-rail applications | Prefer for cost-sensitive, non-noise-critical applications where AN90031 benefits are unnecessary |
Compared with MMBZ5247BS and BZX84-C22, BZX8450-C22R uniquely combines 50 µA test current, optimized leakage for noise reduction, and 250 mW dissipation in SOT23 - making it the only choice for µA-biased, low-noise, space-constrained Zener references.
Availability
BZX8450-C22R is available at Aetrix Electronics and suitable for portable sensor biasing, low-power ADC reference, EEPROM write protection, and microcontroller reset threshold applications requiring stable component supply across long-lifecycle industrial programs.
Supply support for BZX8450-C22R 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 BZX8450 series belongs to Nexperia's low-current Zener regulator product line, engineered specifically for battery-powered and space-constrained systems demanding precision voltage reference at microampere bias levels.
FAQ
What is the maximum reverse voltage before breakdown for BZX8450-C22R?
The BZX8450-C22R exhibits a sharp reverse breakdown between 20.9 V and 23.1 V at IZ = 50 µA. Below 20.9 V, reverse current remains ≤0.05 µA; no defined "maximum non-breakdown voltage" is specified - operation below VZ(min) is intended for leakage-limited biasing, not blocking.
Can BZX8450-C22R be used in parallel for higher power handling?
No - Zener diodes exhibit negative temperature coefficient and parameter spread, causing current hogging when paralleled. The datasheet specifies single-device operation only; for >250 mW, use a higher-rated Zener or active regulation. Parallel use risks thermal runaway and premature failure.
Is the n.c. pin (Pin 2) electrically isolated or internally tied?
Pin 2 is confirmed as internally not connected - no bond wire, no die connection, and no internal metallization link. It is mechanically present for SOT23 mold integrity and PCB alignment but must remain unconnected on the board to prevent parasitic capacitance or mechanical stress-induced cracking.
Does BZX8450-C22R meet AEC-Q200 for automotive use?
No - the BZX8450-C22R is not AEC-Q200 qualified. Nexperia explicitly states in Section 14 that non-automotive qualified products are unsuitable for automotive applications. This part is rated for industrial and consumer use only, with operating ambient range of −55 °C to +150 °C but no automotive stress testing or qualification.
BZX8450-C22R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Voltage - Zener (Nom) (Vz):
- 22 V
- Tolerance:
- ±5%
- Power - Max:
- 250 mW
- Impedance (Max) (Zzt):
- 55 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 16.7 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-236AB
BZX8450-C22R FAQ
1.How can I place an order for BZX8450-C22R through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX8450-C22R 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 BZX8450-C22R reliable?
The price and inventory of BZX8450-C22R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX8450-C22R is usually 5 days.
3.What payment methods are accepted for BZX8450-C22R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX8450-C22R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX8450-C22R?
BZX8450-C22R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX8450-C22R 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 BZX8450-C22R?
For technical support, including BZX8450-C22R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX8450-C22R requirements.
6.How does Aetrix verify that BZX8450-C22R is sourced from the original manufacturer or authorized distributors?
All BZX8450-C22R 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 BZX8450-C22R meets industry standards.
7.What is the process for return or replacement of BZX8450-C22R?
All BZX8450-C22R units undergo pre-shipment inspection (PSI). If there is an issue with BZX8450-C22R, 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 BZX8450-C22R part is unused and in its original packaging.
Return procedure for BZX8450-C22R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX8450-C22R Tags
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