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Nexperia USA Inc. BZX8450-C36-QR
- Part No.:
- BZX8450-C36-QR
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX8450-C36-QR.pdf
- Description:
- DIODE ZENER 36V 250MW TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,814
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Product details
Overview
BZX8450-C36-QR from Nexperia is a low-current Zener voltage regulator diode in SOT23 package, rated for 36 V nominal working voltage (±5 % tolerance), 250 mW total power dissipation, and specified at 50 μA test current - optimized for low-bias, battery-powered regulation in automotive sensor interfaces and microcontroller reference rails.
For engineers reviewing the BZX8450-C36-QR datasheet, BZX8450-C36-QR pinout, BZX8450-C36-QR application, or BZX8450-C36-QR equivalent, key selection criteria include its AEC-Q101 qualification, 350 Ω differential resistance at 5 mA, −0.05 μA reverse current at 27.3 V, and intentional leakage tuning for noise reduction in precision analog monitoring circuits.
Technical Context
This device operates as a two-terminal shunt regulator with cathode-anode polarity, leveraging silicon PN-junction Zener breakdown at 36 V nominal. Its design targets stable DC voltage reference under light-load conditions where bias current is constrained to ≤50 μA.
The C-tolerance variant exhibits ±5 % voltage tolerance and incorporates controlled leakage rise per AN90031 to suppress switching transients and improve noise immunity - distinct from standard B-series parts with ±2 % tolerance and lower leakage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 36 V ±5 % - defines regulated output voltage under 50 μA test current; actual operating range 34.2 V to 37.8 V. |
| Differential Resistance | 350 Ω max at IZ = 5 mA - limits voltage deviation under load variation; critical for maintaining regulation accuracy in dynamic bias networks. |
| Reverse Current | 0.05 μA max at VR = 27.3 V - ensures ultra-low standby power draw in always-on automotive modules. |
| Forward Voltage | 0.9 V max at IF = 10 mA - enables predictable forward conduction during transient overvoltage clamping or dual-role protection schemes. |
| Total Power Dissipation | 250 mW at Tamb ≤ 25 °C on FR4 PCB - sets thermal boundary for continuous operation without heatsinking in space-constrained SMT layouts. |
| Junction Temperature | −55 °C to +150 °C - supports engine bay and ADAS ECU deployment per AEC-Q101 stress qualification. |
| Package | SOT23 - 3-terminal surface-mount plastic package (2.9 mm × 1.3 mm × 1.0 mm) enabling high-density PCB placement and automated assembly. |
Pinout & Package
SOT23 plastic surface-mount package with 1.9 mm pin pitch, 2.9 mm length, 1.3 mm width, and 1.0 mm height; designed for reflow and wave soldering per IPC-7095 guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Positive terminal during forward conduction; connected to lower-potential node in shunt regulation configuration. |
| 2 | Not Connected (n.c.) | Internally unconnected; must remain floating - no PCB trace or thermal pad connection permitted. |
| 3 | Cathode (K) | Regulated output node; tied to system reference rail and provides stable 36 V Zener voltage when reverse-biased. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - suitable for under-hood ECUs and ADAS sensors. |
| Low test current specification | Characterized at 50 μA - enables use in micropower systems where supply current budget is <100 μA, such as tire pressure monitors and smart battery gauges. |
| Optimized leakage profile | Intentional minor leakage rise per AN90031 - reduces high-frequency noise coupling in ADC reference paths and improves transient response in feedback loops. |
| Two tolerance options | ±2 % (B-series) and ±5 % (C-series) - allows cost/performance trade-off: C36-QR prioritizes production yield and noise performance over tight voltage binning. |
Applications
| Automotive Sensor Reference | Portable Medical Monitor Bias |
|---|---|
Use Scenario: Providing stable 36 V reference for MEMS pressure sensor signal conditioning in brake-by-wire control units. IC Role / Device Role / Timing Role: Shunt voltage regulator establishing precise bias point for op-amp input stages and ADC reference dividers. Use Value: Maintains <±1 % reference drift across −40 °C to +125 °C ambient due to AEC-Q101 thermal validation and low-tempco Zener structure. |
Use Scenario: Generating low-noise 36 V rail for photodiode transimpedance amplifier in handheld pulse oximeters. IC Role / Device Role / Timing Role: Low-leakage Zener source supplying regulated bias while minimizing dark-current error in analog front-end. Use Value: 0.05 μA reverse current at 75 % of VZ prevents baseline shift in sub-μA photocurrent measurements. |
| Industrial PLC Input Protection | Smart Energy Meter Reference |
Use Scenario: Clamping and regulating 36 V auxiliary supply for isolated digital input modules in factory automation controllers. IC Role / Device Role / Timing Role: Dual-function component acting as both overvoltage protector and precision reference generator. Use Value: 250 mW power rating sustains continuous regulation during 24 VDC field bus surges up to 30 V without thermal runaway. |
Use Scenario: Stabilizing 36 V reference for metrology-grade voltage measurement circuitry in DIN-rail energy meters. IC Role / Device Role / Timing Role: Primary shunt regulator defining accuracy-critical scaling factor for 16-bit sigma-delta ADC inputs. Use Value: 350 Ω differential resistance ensures <0.5 % full-scale error contribution even with ±10 % load current variation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C36 | Non-AEC-Q101, ±5 % tolerance, same 36 V nominal and SOT23 package but lacks automotive qualification and optimized leakage tuning. | Restricted to commercial-grade consumer or industrial equipment without automotive lifecycle or reliability requirements. | Select only if AEC-Q101 compliance and noise-sensitive operation are not required; lower cost but higher risk in automotive deployments. |
| MMSZ5245B | 36 V Zener, ±5 %, 500 mW Ptot, DO-213AA package - higher power rating but larger footprint and no AEC-Q101 qualification. | Used in higher-power analog supplies where thermal margin exceeds 250 mW, but incompatible with high-density SMT layouts requiring SOT23. | Choose when board space permits larger package and >250 mW dissipation is needed; avoid where automotive qualification or miniaturization is mandatory. |
Compared with BZX84-C36 and MMSZ5245B, the BZX8450-C36-QR uniquely combines AEC-Q101 qualification, SOT23 miniaturization, and application-specific leakage tuning - making it the sole option for noise-critical, space-constrained automotive voltage references requiring long-term reliability.
Availability
BZX8450-C36-QR is available at Aetrix Electronics and suitable for automotive sensor interfaces, portable medical monitors, industrial PLC input stages, and smart energy meter reference circuits requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for BZX8450-C36-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 focused on essential efficiency technologies, delivering high-performance, reliable discrete and logic devices for automotive, industrial, and mobile markets.
The BZX8450-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode portfolio, engineered specifically for low-current, low-noise voltage regulation in automotive electronics and battery-constrained embedded systems.
FAQ
What is the maximum reverse voltage this diode can withstand before breakdown?
The BZX8450-C36-QR has a nominal Zener voltage of 36 V with a guaranteed range of 34.2 V to 37.8 V at 50 μA test current. Its absolute maximum non-repetitive peak reverse voltage is not specified separately - breakdown occurs within this band, and operation above 37.8 V risks exceeding limiting values defined in Table 5, including junction temperature and power dissipation limits.
Can this part replace a standard 1N4733A in a 5 V regulator circuit?
No - the BZX8450-C36-QR is a 36 V Zener, not a 5 V device. The 1N4733A is rated for 5.1 V. Substituting BZX8450-C36-QR would result in catastrophic overvoltage at the regulated node. For 5 V replacement, consider BZX8450-C5V1-Q (5.1 V ±5 %) or equivalent, which shares the same SOT23 package and AEC-Q101 qualification.
Is Pin 2 truly unused, or does it serve a thermal function?
Pin 2 is explicitly marked "n.c." (not connected) in the official Nexperia pinning diagram and internal die layout. It is electrically isolated and serves no electrical or thermal function. PCB land pattern must leave Pin 2 unconnected - no trace, thermal relief, or solder mask opening is permitted, as contact could induce mechanical stress or contamination-related failure.
How does the "optimized fast switching" feature affect regulation stability?
The intentional minor leakage rise (per AN90031) reduces minority-carrier storage time and suppresses high-frequency ringing during voltage transients - improving regulation stability in feedback-controlled systems like ADC reference buffers. It does not alter DC regulation accuracy but enhances dynamic response in noisy environments such as motor drive subsystems.
BZX8450-C36-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:
- Discontinued at Digi-Key
- Voltage - Zener (Nom) (Vz):
- 36 V
- Tolerance:
- ±5%
- Power - Max:
- 250 mW
- Impedance (Max) (Zzt):
- 90 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 27.3 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-C36-QR FAQ
1.How can I place an order for BZX8450-C36-QR through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX8450-C36-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-C36-QR reliable?
The price and inventory of BZX8450-C36-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-C36-QR is usually 5 days.
3.What payment methods are accepted for BZX8450-C36-QR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX8450-C36-QR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX8450-C36-QR?
BZX8450-C36-QR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX8450-C36-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-C36-QR?
For technical support, including BZX8450-C36-QR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX8450-C36-QR requirements.
6.How does Aetrix verify that BZX8450-C36-QR is sourced from the original manufacturer or authorized distributors?
All BZX8450-C36-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-C36-QR meets industry standards.
7.What is the process for return or replacement of BZX8450-C36-QR?
All BZX8450-C36-QR units undergo pre-shipment inspection (PSI). If there is an issue with BZX8450-C36-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-C36-QR part is unused and in its original packaging.
Return procedure for BZX8450-C36-QR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX8450-C36-QR Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
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