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Nexperia USA Inc. BZX8450-C1V8-QR
- Part No.:
- BZX8450-C1V8-QR
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX8450-C1V8-QR.pdf
- Description:
- DIODE ZENER 1.8V 250MW TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:1,014
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Product details
Overview
BZX8450-C1V8-Q from Nexperia is a low-current Zener voltage regulator diode in SOT23 package, providing 1.8 V nominal regulation at 50 μA test current, with ±5 % tolerance, 250 mW power dissipation, and AEC-Q101 qualification for automotive use.
For engineers reviewing the BZX8450-C1V8-Q datasheet, BZX8450-C1V8-Q pinout, BZX8450-C1V8-Q application, or BZX8450-C1V8-Q equivalent, this device serves as a precision low-bias voltage reference in battery-powered sensor nodes, ECU voltage monitoring rails, and low-power microcontroller reset circuits where leakage-sensitive operation is critical.
Technical Context
This Zener diode operates in reverse breakdown mode with a specified working voltage of 1.71 V to 1.89 V at IZ = 50 μA, exhibiting a temperature coefficient of −3.5 mV/K and differential resistance ≤600 Ω at 5 mA. Its low 50 μA test current enables stable regulation under ultra-low quiescent current conditions.
The device features intentional minor leakage current optimization per AN90031 for fast switching transients and reduced noise in signal conditioning paths, and is rated for junction temperatures up to 150 °C with thermal resistance Rth(j-a) = 500 K/W on FR4 PCB.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 1.8 V (range 1.71 V to 1.89 V at 50 μA - defines low-voltage reference point for 1.8 V logic or analog biasing) |
| Tolerance | ±5 % (C-series - tighter than standard Zeners for predictable rail margining in automotive diagnostics) |
| Power Dissipation | 250 mW (max at Tamb ≤ 25 °C on FR4 PCB - supports continuous regulation in space-constrained SMT layouts) |
| Test Current | 50 μA (enables stable regulation in sub-100 μA supply domains such as RTC backup or wake-up comparators) |
| Forward Voltage | ≤0.9 V at 10 mA (ensures minimal forward drop in series protection or clamping configurations) |
| Reverse Leakage | ≤1.0 μA at VR = 1.0 V (low leakage preserves battery life in always-on monitoring circuits) |
| Capacitance | 220 pF at VR = 0 V, f = 1 MHz (predictable parasitic loading for filtering or noise-sensitive analog inputs) |
Pinout & Package
SOT23 plastic surface-mount package (2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm pitch), thermally optimized with cathode tab solder point (Rth(j-sp) = 330 K/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Connects to lower-potential node; reverse-biased during regulation - must be held at potential ≤ (cathode − VZ) |
| 2 | Not Connected (n.c.) | Internally unconnected terminal - no PCB trace or solder required; electrically isolated |
| 3 | Cathode (K) | Reference output node; ties to regulated voltage rail - also serves as primary thermal path to PCB |
Key Features
| Feature | Design Value |
|---|---|
| Low-test-current regulation | Specified at 50 μA - enables reliable voltage reference in energy-harvesting and coin-cell applications without load-induced drift |
| AEC-Q101 qualification | Qualified for automotive under stress test standard - supports deployment in engine control modules and ADAS sensor interfaces |
| Optimized leakage profile | Intentional minor leakage per AN90031 - reduces switching noise and improves transient response in feedback loops |
| Thermal performance | Rth(j-sp) = 330 K/W - allows direct heat sinking via cathode pad, critical for sustained operation in sealed ECUs |
Applications
| Automotive ECU Power Monitoring | IoT Sensor Node Reference |
|---|---|
Use Scenario: Real-time monitoring of 1.8 V microcontroller core supply in engine control unit under cold-crank conditions. IC Role / Device Role / Timing Role: Zener shunt regulator providing stable 1.8 V reference for ADC calibration and brown-out detection circuitry. Use Value: ±5 % tolerance and −3.5 mV/K tempco ensure <±20 mV drift across −40 °C to +125 °C ambient, meeting ASIL-B diagnostic accuracy requirements. |
Use Scenario: Battery-backed environmental sensor operating from CR2032 cell with <10 μA average system current. IC Role / Device Role / Timing Role: Low-current voltage reference for op-amp-based temperature transducer biasing and ADC reference divider. Use Value: 50 μA test current and 1.0 μA max leakage at 1.0 V reverse bias extend shelf life by >30 % versus standard 5 mA Zeners. |
| Industrial PLC Input Protection | Wearable Device Reset Circuit |
Use Scenario: Overvoltage clamping and level-shifting for 1.8 V digital input channels exposed to 24 V field wiring transients. IC Role / Device Role / Timing Role: Shunt clamp diode placed between input pin and ground, absorbing surge energy while holding logic threshold. Use Value: 250 mW Ptot and 40 W non-repetitive peak power rating enable robust handling of IEC 61000-4-5 Level 3 surges without derating. |
Use Scenario: Power-on reset generation for ultra-low-power BLE SoC in fitness tracker, triggered by 1.8 V rail stabilization. IC Role / Device Role / Timing Role: Precision voltage threshold detector element in RC-based reset timing network. Use Value: Tight 1.71–1.89 V VZ window ensures reset assertion within 10 ms of 1.8 V rail rise, eliminating false triggers during battery recovery. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C1V8 | Same 1.8 V, ±5 %, SOT23 but not AEC-Q101 qualified; higher typical leakage (2.5 μA vs 1.0 μA) | Limited to commercial-grade portable electronics; unsuitable for automotive under hood or chassis locations | Select only for cost-sensitive consumer devices where qualification and leakage are non-critical |
| MMSZ4678T1G | 1.8 V, ±5 %, SOD-123 package; 500 mW rating but 10× higher capacitance (2.2 nF) and no automotive qualification | Higher thermal mass but incompatible with high-frequency signal paths due to excessive junction capacitance | Prefer for high-power, low-speed clamping; avoid in RF-adjacent or fast-sampling analog circuits |
Compared with BZX8450-C1V8-Q, BZX84-C1V8 lacks automotive qualification and has higher leakage, while MMSZ4678T1G trades packaging robustness for excessive capacitance - making the BZX8450-C1V8-Q uniquely suited for AEC-Q101-compliant, low-noise, low-leakage 1.8 V regulation.
Availability
BZX8450-C1V8-Q is available at Aetrix Electronics and suitable for automotive ECU design, IoT sensor node development, and industrial PLC input protection requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for BZX8450-C1V8-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 focused on high-volume, high-reliability discrete and logic devices, with leadership in automotive-qualified components and advanced packaging.
The BZX8450-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode product line, engineered specifically for low-current, low-noise voltage regulation in automotive and industrial edge-sensing applications.
FAQ
What is the maximum reverse voltage before breakdown for BZX8450-C1V8-Q?
The device exhibits a sharp reverse breakdown at its nominal Zener voltage of 1.8 V, with guaranteed regulation starting at 1.71 V (min) and ending at 1.89 V (max) when tested at 50 μA. It is not rated for stable operation above 1.89 V in regulation mode, and exceeding 2.0 V risks thermal runaway under sustained bias.
Can BZX8450-C1V8-Q be used in forward conduction mode?
Yes - it functions as a standard silicon diode in forward bias, with VF ≤ 0.9 V at 10 mA. However, its primary design intent is reverse-bias Zener regulation; forward use is limited to low-current clamping or indicator applications where its 250 mW dissipation limit and SOT23 thermal constraints apply.
How does the "C" suffix differ from "B" in the BZX8450-Q series?
The "C" suffix denotes ±5 % tolerance and an intentional minor leakage current profile optimized for fast switching and noise reduction per AN90031, whereas "B" indicates ±2 % tolerance and standard leakage. For BZX8450-C1V8-Q, this means 1.71–1.89 V range and ≤1.0 μA IR at 1.0 V, versus B1V8's 1.76–1.84 V and higher leakage.
Is pin 2 truly unconnected, or does it serve a mechanical function?
Pin 2 is electrically unconnected (n.c.) - no internal bond wire or die connection exists. Its sole purpose is mechanical: it provides structural symmetry and solder joint reliability in the SOT23 footprint, improving board-level mechanical integrity without affecting electrical performance.
BZX8450-C1V8-QR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX8450-Q
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 1.8 V
- Tolerance:
- ±5%
- Power - Max:
- 250 mW
- Impedance (Max) (Zzt):
- 100 Ohms
- Current - Reverse Leakage @ Vr:
- 7.5 µA @ 1 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:
- TO-236AB
BZX8450-C1V8-QR FAQ
1.How can I place an order for BZX8450-C1V8-QR through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX8450-C1V8-QR 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-C1V8-QR reliable?
The price and inventory of BZX8450-C1V8-QR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX8450-C1V8-QR is usually 5 days.
3.What payment methods are accepted for BZX8450-C1V8-QR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX8450-C1V8-QR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX8450-C1V8-QR?
BZX8450-C1V8-QR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX8450-C1V8-QR 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-C1V8-QR?
For technical support, including BZX8450-C1V8-QR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX8450-C1V8-QR requirements.
6.How does Aetrix verify that BZX8450-C1V8-QR is sourced from the original manufacturer or authorized distributors?
All BZX8450-C1V8-QR 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-C1V8-QR meets industry standards.
7.What is the process for return or replacement of BZX8450-C1V8-QR?
All BZX8450-C1V8-QR units undergo pre-shipment inspection (PSI). If there is an issue with BZX8450-C1V8-QR, 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-C1V8-QR part is unused and in its original packaging.
Return procedure for BZX8450-C1V8-QR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX8450-C1V8-QR Tags
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MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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BZT52C15-7-F
Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
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BZT52C15S-7-F
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MM5Z5V1ST1G
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SMAJ4744A-TP
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Diodes Incorporated
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SMAZ12-13-F
Diodes Incorporated
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