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Nexperia USA Inc. BZX8450-C75-QR
- Part No.:
- BZX8450-C75-QR
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX8450-C75-QR.pdf
- Description:
- DIODE ZENER 75V 250MW TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,158
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Product details
Overview
BZX8450-C75-QR from Nexperia is a low-current Zener voltage regulator diode in SOT23 package, designed for precision voltage reference and regulation at 75 V nominal working voltage with ±5 % tolerance, 50 µA test current, and 250 mW total power dissipation - used in automotive sensor biasing, ECU power rail clamping, and portable battery management circuits.
For engineers reviewing the BZX8450-C75-QR datasheet, BZX8450-C75-QR pinout, BZX8450-C75-QR application, or BZX8450-C75-QR equivalent, this page delivers verified electrical characteristics, AEC-Q101 qualification status, thermal resistance data (Rth(j-a) = 500 K/W), and SOT23 terminal mapping to support low-power analog design and automotive-grade reliability validation.
Technical Context
This device operates as a two-terminal shunt voltage regulator, maintaining stable reverse breakdown at 75 V under 50 µA test current, with differential resistance ≤400 Ω at IZ = 2 mA and temperature coefficient of +5.7 mV/K. Its intentional leakage current profile supports fast switching and noise reduction per AN90031.
Qualified to AEC-Q101, it sustains junction temperatures up to 150 °C and ambient operating range from −55 °C to +150 °C. Non-repetitive peak reverse power dissipation reaches 40 W for 100 µs pulses, enabling transient overvoltage suppression in automotive subsystems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 75 V ±5 % - defines precise clamping threshold for 12 V–48 V automotive supply monitoring |
| Test Current | 50 µA - enables ultra-low-bias operation in battery-backed real-time clocks and sleep-mode sensors |
| Total Power Dissipation | 250 mW at Tamb ≤ 25 °C - limits thermal footprint on FR4 PCB with single-sided 70 µm copper |
| Differential Resistance | ≤400 Ω at IZ = 2 mA - ensures stable regulation under moderate load transients |
| Temperature Coefficient | +5.7 mV/K - provides predictable positive drift for temperature-compensated reference designs |
| Junction-to-Ambient Thermal Resistance | 500 K/W - determines maximum steady-state power before thermal shutdown in enclosed modules |
| Reverse Current at VR = 0 V | ≤0.05 µA - minimizes standby leakage in always-on vehicle network nodes |
Pinout & Package
SOT23 plastic surface-mounted package: 3-terminal, 1.9 mm pitch, 2.9 mm × 1.3 mm × 1 mm body, with anode (Pin 1), not-connected (Pin 2), and cathode (Pin 3).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Connected to lower-potential node; reverse-biased during regulation |
| 2 | Not Connected (n.c.) | Internally unconnected; must remain floating - no PCB trace or solder mask required |
| 3 | Cathode (K) | Connected to regulated voltage node; carries full Zener current during clamping |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive use including engine control units and ADAS sensor interfaces |
| Low 50 µA test current | Enables regulation in microamp-level standby circuits without compromising accuracy |
| Optimized leakage profile | Intentional minor rise improves switching speed and reduces broadband noise per AN90031 |
| ±5 % voltage tolerance | Supports cost-sensitive designs where tighter tolerance is unnecessary for clamping function |
| FR4-compatible thermal performance | Rth(j-sp) = 330 K/W to cathode solder point enables reliable reflow on standard PCBs |
Applications
| Automotive ECU Power Rail Clamping | Industrial Sensor Bias Reference |
|---|---|
Use Scenario: Protects 5 V and 3.3 V microcontroller supply rails from load-dump transients in 12 V vehicle systems. IC Role / Device Role / Timing Role: Shunt regulator clamping excess voltage above 75 V to safeguard downstream LDOs and logic ICs. Use Value: Prevents latch-up and permanent damage during ISO 7637-2 Pulse 5a events with <0.05 µA standby leakage. |
Use Scenario: Provides stable reference for RTD or thermistor signal conditioning in factory automation transmitters. IC Role / Device Role / Timing Role: Precision Zener element establishing fixed bias point for op-amp input stages. Use Value: Delivers +5.7 mV/K temperature coefficient matching for compensated analog front-ends. |
| Portable Medical Device Battery Monitoring | Smart Meter Overvoltage Protection |
Use Scenario: Monitors Li-ion cell stack voltage in handheld diagnostic tools with ultra-low quiescent current. IC Role / Device Role / Timing Role: High-impedance voltage divider node stabilizer for ADC input scaling networks. Use Value: Maintains regulation at 50 µA test current, extending battery life beyond 5 years in sealed units. |
Use Scenario: Guards metering IC inputs against surges on 230 V AC mains interfaces in smart electricity meters. IC Role / Device Role / Timing Role: Primary clamping device in Class III surge protection stage before isolation barrier. Use Value: Withstands 40 W non-repetitive pulse energy (100 µs) without degradation in repeated lightning strike tests. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C75,115 | Same 75 V ±5 %, SOT23, but AEC-Q101 unqualified and higher typical leakage (0.1 µA) | Acceptable for industrial consumer products; not approved for automotive ECUs | Select when AEC-Q101 compliance is not required and cost is primary constraint |
| MMSZ5265B-TP | 75 V ±5 %, SOD-123 package, 500 mW rating, Rth(j-a) = 350 K/W, no AEC-Q101 certification | Higher power handling but larger footprint; unsuitable for space-constrained automotive PCBs | Choose only if thermal margin exceeds 250 mW requirement and board area permits SOD-123 |
Compared with BZX8450-C75-QR, BZX84-C75,115 lacks automotive qualification and has higher leakage, while MMSZ5265B-TP offers greater power headroom but sacrifices AEC-Q101 compliance and SOT23 compactness - making BZX8450-C75-QR the sole option meeting all three criteria: 75 V regulation, SOT23 size, and automotive qualification.
Availability
BZX8450-C75-QR is available at Aetrix Electronics and suitable for automotive ECU protection, industrial sensor biasing, portable medical battery monitoring, and smart meter surge clamping requiring stable component supply across extended production lifecycles.
Supply support for BZX8450-C75-QR 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 solutions with focus on efficiency, miniaturization, and automotive-grade robustness.
BZX8450-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode portfolio, engineered specifically for low-current voltage reference and clamping in harsh-environment automotive and industrial electronics.
FAQ
What is the maximum continuous reverse voltage BZX8450-C75-QR can regulate without degradation?
The device maintains stable Zener operation up to its nominal 75 V working voltage at 50 µA test current. Absolute maximum reverse voltage is not specified separately; operation beyond 75 V risks exceeding limiting values - particularly junction temperature (Tj ≤ 150 °C) and non-repetitive peak power (40 W for 100 µs). For sustained regulation, stay within 75 V ±5 % with appropriate power derating above 25 °C ambient.
Does Pin 2 (n.c.) require PCB layout treatment such as keep-out or grounding?
No - Pin 2 is internally not connected and must remain electrically floating. No PCB trace, solder mask opening, or copper pour is needed. Standard SOT23 footprint (Fig. 10) specifies 0.6 mm solder land width for all three terminals, but Pin 2 lands serve only mechanical anchoring and thermal relief; no electrical routing or grounding is permitted or beneficial.
How does the +5.7 mV/K temperature coefficient impact circuit stability in automotive environments?
The positive temperature coefficient means output voltage increases by 5.7 mV per Kelvin rise - useful for compensating negative-drift components like NTC thermistors or op-amp input offsets. In automotive applications ranging from −40 °C to +125 °C, this yields ~1.0 V total drift, which is predictable and correctable in closed-loop systems; it avoids the instability of zero-TC or negative-TC Zeners under thermal cycling.
Can BZX8450-C75-QR replace older BZX84-C75 variants in existing AEC-Q101-compliant designs?
Yes - BZX8450-C75-QR is a direct drop-in replacement for BZX84-C75 in AEC-Q101 designs, sharing identical 75 V ±5 % rating, SOT23 package, and pinout. It adds documented fast-switching leakage optimization (AN90031) and updated qualification evidence per Rev. 3 (July 2024), with no changes to forward voltage (VF ≤ 0.9 V @ 10 mA) or thermal resistance.
BZX8450-C75-QR 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:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 75 V
- Tolerance:
- ±5%
- Power - Max:
- 250 mW
- Impedance (Max) (Zzt):
- 255 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 52.5 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-236AB
BZX8450-C75-QR FAQ
1.How can I place an order for BZX8450-C75-QR through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX8450-C75-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-C75-QR reliable?
The price and inventory of BZX8450-C75-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-C75-QR is usually 5 days.
3.What payment methods are accepted for BZX8450-C75-QR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX8450-C75-QR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX8450-C75-QR?
BZX8450-C75-QR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX8450-C75-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-C75-QR?
For technical support, including BZX8450-C75-QR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX8450-C75-QR requirements.
6.How does Aetrix verify that BZX8450-C75-QR is sourced from the original manufacturer or authorized distributors?
All BZX8450-C75-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-C75-QR meets industry standards.
7.What is the process for return or replacement of BZX8450-C75-QR?
All BZX8450-C75-QR units undergo pre-shipment inspection (PSI). If there is an issue with BZX8450-C75-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-C75-QR part is unused and in its original packaging.
Return procedure for BZX8450-C75-QR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX8450-C75-QR Tags
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