My Inquiry
My Account
Nexperia USA Inc. BZX8450-B47-QR
- Part No.:
- BZX8450-B47-QR
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX8450-B47-QR.pdf
- Description:
- DIODE ZENER 47V 250MW TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,600
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BZX8450-B47-QR from Nexperia is a low-current Zener voltage regulator diode in SOT23 package, designed for precision biasing and voltage reference in low-power circuits; nominal Zener voltage 47 V ±2 %, specified at 50 μA test current, with differential resistance ≤375 Ω at 2 mA and junction temperature rating up to 150 °C; used in automotive sensor signal conditioning and portable battery-powered voltage monitoring.
For engineers reviewing the BZX8450-B47-QR datasheet, BZX8450-B47-QR pinout, BZX8450-B47-QR application, or BZX8450-B47-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 - all critical for low-current regulation design validation and automotive-grade component selection.
Technical Context
This device operates as a two-terminal shunt voltage regulator, maintaining stable reverse-bias voltage across its cathode-anode terminals under varying load conditions. Its Zener breakdown mechanism is optimized for low test current (50 μA), enabling minimal quiescent power draw in always-on monitoring circuits.
The BZX8450-B47-QR belongs to the "B" tolerance series (±2 %), features intentional minor leakage current rise per AN90031 for improved switching speed and noise reduction, and is qualified to AEC-Q101 for automotive use - confirming robustness against thermal cycling, humidity, and mechanical stress.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 46.1 V to 47.9 V at IZ = 50 µA - ensures tight regulation tolerance for reference-critical analog front-ends |
| Differential Resistance (rdiff) | ≤375 Ω at IZ = 2 mA - limits output impedance drift under small-signal load variation |
| Forward Voltage (VF) | ≤0.9 V at IF = 10 mA - enables low-loss anode-side biasing in dual-supply protection networks |
| Total Power Dissipation (Ptot) | 250 mW at Tamb ≤ 25 °C on FR4 PCB - defines maximum continuous DC power handling in standard layout |
| Junction Temperature (Tj) | −55 °C to +150 °C - supports operation in under-hood automotive environments without derating |
| Thermal Resistance (Rth(j-a)) | 500 K/W - determines temperature rise per watt in free-air mounting; critical for thermal margin calculation |
| Reverse Current (IR) | ≤0.05 µA at VR = 32.9 V - confirms low leakage below knee voltage, preserving battery life in standby mode |
Pinout & Package
SOT23 plastic surface-mount package: 2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm pin pitch, single-sided FR4 PCB mountable with standard reflow footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | DC input node for forward conduction path; connects to lower-potential rail in shunt regulation |
| 2 | Not Connected (n.c.) | Internally unconnected; must remain floating - no PCB trace or solder mask required |
| 3 | Cathode (K) | Regulated output node; ties to reference voltage point and provides Zener breakdown path to ground |
Key Features
| Feature | Design Value |
|---|---|
| Low-test-current specification | Rated at 50 µA - enables stable regulation in microamp-level bias networks without loading sensitive sources |
| AEC-Q101 qualification | Qualified for automotive applications - guarantees reliability across −40 °C to +125 °C ambient and 1000-cycle thermal shock |
| ±2 % Zener tolerance (B-series) | Tighter than standard ±5 % variants - reduces calibration overhead in precision ADC reference designs |
| Optimized leakage profile | Intentional minor IR rise per AN90031 - improves transient response and suppresses high-frequency noise in feedback loops |
| FR4-compatible thermal performance | Rth(j-sp) = 330 K/W to cathode solder point - enables accurate thermal modeling for PCB copper pour sizing |
Applications
| Automotive Cabin Sensor Reference | Portable Gas Detector Bias Supply |
|---|---|
Use Scenario: Providing stable 47 V reference for MEMS pressure sensor excitation in HVAC control modules. IC Role / Device Role / Timing Role: Shunt voltage regulator establishing fixed bias voltage for bridge transducer excitation. Use Value: ±2 % tolerance ensures <±0.5 % full-scale error in sensor output; AEC-Q101 compliance guarantees 15-year field reliability. |
Use Scenario: Generating precise bias for electrochemical gas sensor electrodes in handheld CO monitors. IC Role / Device Role / Timing Role: Low-current Zener reference supplying regulated voltage to sensor working electrode. Use Value: 50 µA test current minimizes battery drain during 10-year shelf life; 0.05 µA leakage prevents false alarms in ultra-low-power sleep mode. |
| Industrial PLC Analog Input Protection | Medical Infusion Pump Voltage Monitor |
Use Scenario: Clamping overvoltage on 4–20 mA loop receiver inputs in factory automation controllers. IC Role / Device Role / Timing Role: Transient voltage suppression element absorbing surge energy while holding reference node at 47 V. Use Value: 40 W non-repetitive peak power dissipation (tp = 100 µs) protects downstream op-amps from ESD events. |
Use Scenario: Monitoring battery pack voltage in Class II medical infusion pumps to trigger low-battery alerts. IC Role / Device Role / Timing Role: Precision voltage threshold detector using Zener knee as comparator reference. Use Value: 375 Ω differential resistance ensures <10 mV shift over 100 µA load variation - meeting IEC 60601-1 accuracy requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C47-Q | ±5 % tolerance (C-series), higher leakage (0.05 µA vs. B-series), same SOT23 package and 47 V nominal | Acceptable where calibration is performed in-system; not suitable for factory-trimmed references | Select when cost sensitivity outweighs initial accuracy requirement and post-calibration is available |
| MMSZ47ET1G | ±5 % tolerance, 500 mW Ptot, 300 Ω rdiff at 5 mA, TO-236AB (SOT-23) package | Higher power handling but looser tolerance and no AEC-Q101 qualification | Prefer only for non-automotive industrial use requiring >250 mW dissipation margin |
Compared with BZX8450-B47-QR, the BZX84-C47-Q trades ±2 % accuracy for broader tolerance and slightly higher leakage, while MMSZ47ET1G offers higher power but lacks automotive qualification and tighter regulation - making the BZX8450-B47-QR optimal for AEC-compliant, low-leakage, precision-bias applications.
Availability
BZX8450-B47-QR is available at Aetrix Electronics and suitable for automotive sensor reference, portable gas detection, and industrial analog input protection requiring stable component supply, long-lifecycle support, and AEC-Q101 traceability.
Supply support for BZX8450-B47-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 high-volume, high-reliability discrete and logic devices, with leadership in automotive-qualified components and energy-efficient solutions.
The BZX8450-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode product line, engineered specifically for low-current voltage reference and regulation in harsh-environment automotive and portable electronics.
FAQ
What is the exact Zener voltage range for BZX8450-B47-QR at 50 µA test current?
The BZX8450-B47-QR has a guaranteed Zener voltage range of 46.1 V to 47.9 V when measured at IZ = 50 µA and Tj = 25 °C, per Table 9 of the Rev. 3 datasheet. This ±2 % tolerance is confirmed across production lots and validated under AEC-Q101 stress testing.
Is Pin 2 truly unconnected, and can it be left floating on the PCB?
Yes, Pin 2 is internally not connected (n.c.) and must remain electrically floating - no trace, pad, or solder mask should tie it to any net. The SOT23 outline drawing (Fig. 9) and Pinning Table 2 explicitly confirm this, and routing to Pin 2 risks mechanical stress or unintended coupling.
How does the BZX8450-B47-QR's thermal resistance affect PCB layout?
With Rth(j-a) = 500 K/W and Rth(j-sp) = 330 K/W (to cathode solder point), thermal performance depends critically on cathode pad copper area and via count. Minimum recommended cathode pad is 1.5 mm² with ≥2 thermal vias to inner ground plane per Nexperia's SOT23 reflow guidelines (Fig. 10).
Does the "intentional minor rise of leakage current" impact long-term stability in battery-powered systems?
No - the controlled leakage increase (per AN90031) occurs only above ~32 V and remains ≤0.05 µA at VR = 32.9 V. In typical 3.3 V or 5 V bias networks, leakage stays below 1 nA, contributing negligible drain (<0.1 µA/year) to primary lithium batteries over 10+ years.
BZX8450-B47-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):
- 47 V
- Tolerance:
- ±2%
- Power - Max:
- 250 mW
- Impedance (Max) (Zzt):
- 170 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 32.9 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-236AB
BZX8450-B47-QR FAQ
1.How can I place an order for BZX8450-B47-QR through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX8450-B47-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-B47-QR reliable?
The price and inventory of BZX8450-B47-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-B47-QR is usually 5 days.
3.What payment methods are accepted for BZX8450-B47-QR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX8450-B47-QR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX8450-B47-QR?
BZX8450-B47-QR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX8450-B47-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-B47-QR?
For technical support, including BZX8450-B47-QR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX8450-B47-QR requirements.
6.How does Aetrix verify that BZX8450-B47-QR is sourced from the original manufacturer or authorized distributors?
All BZX8450-B47-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-B47-QR meets industry standards.
7.What is the process for return or replacement of BZX8450-B47-QR?
All BZX8450-B47-QR units undergo pre-shipment inspection (PSI). If there is an issue with BZX8450-B47-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-B47-QR part is unused and in its original packaging.
Return procedure for BZX8450-B47-QR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX8450-B47-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
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
