My Inquiry
My Account
Nexperia USA Inc. BZX8450-B4V3R
- Part No.:
- BZX8450-B4V3R
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX8450-B4V3R.pdf
- Description:
- DIODE ZENER 4.3V 250MW TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,941
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BZX8450-B4V3R from Nexperia is a low-current Zener voltage regulator diode in SOT23 package, designed for precision biasing and voltage reference in portable electronics. It delivers a nominal 4.3 V regulation at 50 μA test current, with ±2 % tolerance, 250 mW total power dissipation, and 95 Ω differential resistance at 5 mA - enabling stable low-power rail stabilization in battery-powered sensor nodes and microcontroller reset circuits.
For engineers reviewing the BZX8450-B4V3R datasheet, BZX8450-B4V3R pinout, BZX8450-B4V3R application, or BZX8450-B4V3R equivalent, key selection criteria include its low 50 μA test current specification, intentional leakage optimization for noise reduction (per AN90031), SOT23 footprint compatibility, and thermal resistance of 330 K/W to solder point - all critical for space-constrained, thermally sensitive designs.
Technical Context
This device operates as a two-terminal shunt voltage regulator, maintaining a stable reverse-biased breakdown voltage across its cathode-anode terminals. Its specified 4.3 V nominal Zener voltage is guaranteed at IZ = 50 μA, with temperature coefficient of −2.7 mV/K and differential resistance ≤95 Ω at 5 mA, supporting predictable voltage reference behavior over ambient temperatures from −55 °C to +150 °C.
The BZX8450-B4V3R belongs to the "B" tolerance series (±2 %), features a not-connected terminal (Pin 2), and exhibits optimized leakage current for fast switching transients and reduced noise coupling - a design feature explicitly implemented per application note AN90031 to improve performance in signal conditioning paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 4.3 V at IZ = 50 μA - enables precise low-bias voltage reference for MCU brown-out detection |
| Tolerance | ±2 % - ensures tight regulation without post-production trimming in production-grade analog monitoring |
| Differential Resistance | ≤95 Ω at IZ = 5 mA - minimizes output voltage shift under small load variations in feedback networks |
| Forward Voltage | ≤0.9 V at IF = 10 mA - supports reliable anode-cathode conduction during power-up sequencing |
| Total Power Dissipation | 250 mW at Tamb ≤ 25 °C on FR4 PCB - defines maximum continuous DC power handling in standard layout |
| Thermal Resistance (j–sp) | 330 K/W - quantifies junction-to-solder-point thermal path, critical for thermal design in compact PCBs |
| Reverse Leakage Current | ≤4.0 μA at VR = 2.0 V - confirms low standby current draw essential for multi-year battery life |
Pinout & Package
Package: SOT23 plastic surface-mount package (2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm pin pitch), rated for reflow and wave soldering per Figures 10–11.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Positive terminal for forward conduction; connects to lower-potential node in shunt regulation |
| 2 | Not Connected (n.c.) | Internally unconnected; must remain floating - no PCB trace or thermal pad connection |
| 3 | Cathode (K) | Regulated output node; connects to supply rail being stabilized and reference input of downstream circuitry |
Key Features
| Feature | Design Value |
|---|---|
| Low test current operation | Specified at 50 μA - reduces quiescent current in always-on monitoring circuits by >95 % vs. 5 mA Zeners |
| Optimized leakage profile | Intentional minor rise per AN90031 - improves transient response and suppresses high-frequency noise in reference paths |
| ±2 % voltage tolerance | Tight initial accuracy eliminates need for external calibration in cost-sensitive consumer sensor modules |
| SOT23 footprint compatibility | Standard 3-pin, 1.9 mm pitch layout - enables drop-in replacement in existing designs using BZX84-C or MMBZ52xx footprints |
| High-temperature operation | Junction rating up to 150 °C - supports use in enclosed industrial enclosures without derating below 125 °C ambient |
Applications
| Microcontroller Reset Circuit | Portable Sensor Biasing |
|---|---|
|
Use Scenario: Providing clean, low-current voltage threshold for microcontroller reset ICs in wearable health monitors. IC Role / Device Role / Timing Role: Shunt Zener reference generating stable 4.3 V trigger point for reset assertion logic. Use Value: 50 μA test current ensures <1 µA system standby drain; ±2 % tolerance guarantees deterministic reset timing across temperature. |
Use Scenario: Supplying regulated bias voltage to MEMS accelerometer analog front-end in Bluetooth LE beacons. IC Role / Device Role / Timing Role: Low-noise voltage reference stabilizing op-amp supply rails and ADC reference inputs. Use Value: Optimized leakage per AN90031 reduces switching noise coupling into 16-bit ADC measurements by >12 dB. |
| USB-C Power Negotiation Reference | Industrial PLC Input Protection |
|
Use Scenario: Generating accurate 4.3 V reference for USB PD CC line voltage sensing in compact dongles. IC Role / Device Role / Timing Role: Precision shunt regulator defining analog comparator threshold for CC pin state detection. Use Value: 95 Ω differential resistance maintains <10 mV error under 100 µA load variation from CC pull-up current. |
Use Scenario: Clamping and regulating 24 V DC input signals in modular I/O modules exposed to EMI-rich factory floors. IC Role / Device Role / Timing Role: Low-power Zener clamp limiting transient overvoltage while providing stable reference for optocoupler drivers. Use Value: 250 mW power rating allows sustained clamping during 100 ms surges without thermal runaway on standard FR4. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5229BS-7-F | 4.3 V, ±5 % tolerance, 200 mW, SOT23 - higher tolerance, lower power rating | Acceptable where ±5 % regulation suffices and peak power <200 mW | Select when cost sensitivity outweighs precision; avoid in reset circuits requiring tight voltage thresholds |
| BZX84-C4V3 | 4.3 V, ±5 % tolerance, same SOT23 package - lacks intentional leakage optimization and AN90031 compliance | General-purpose regulation only; unsuitable for noise-sensitive analog references | Choose only for non-critical biasing; BZX8450-B4V3R preferred where low-noise or fast transient response is required |
Compared with MMBZ5229BS-7-F and BZX84-C4V3, the BZX8450-B4V3R provides tighter ±2 % tolerance, higher 250 mW power margin, and documented leakage optimization for noise reduction - making it uniquely suited for precision reset, low-drift reference, and EMI-sensitive signal chain applications.
Availability
BZX8450-B4V3R is available at Aetrix Electronics and suitable for portable sensor biasing, microcontroller reset circuits, USB-C power negotiation reference, and industrial PLC input protection requiring stable component supply across high-mix, low-volume production runs.
Supply support for BZX8450-B4V3R 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 ultra-low-power voltage reference and biasing in battery-operated and thermally constrained systems.
FAQ
What is the maximum reverse voltage this diode can withstand before breakdown?
The BZX8450-B4V3R has a nominal Zener voltage of 4.3 V, with minimum and maximum values of 4.21 V and 4.39 V respectively at IZ = 50 μA. Its absolute maximum reverse voltage is defined by the breakdown characteristic - it begins regulating at ~4.2 V and maintains stable regulation up to its power limit. The device is not rated for blocking above its Zener voltage; operation beyond 4.39 V at rated current remains within specification but increases power dissipation linearly.
Can Pin 2 be used as a thermal pad or grounded for improved heat dissipation?
No - Pin 2 is explicitly designated "not connected" (n.c.) in the official Nexperia datasheet and internal die construction. It is electrically isolated and must remain unconnected on the PCB. Using it as a thermal pad or ground will not improve thermal performance and risks mechanical stress or solder bridging. Thermal management relies solely on the cathode (Pin 3) solder point, with Rth(j–sp) = 330 K/W specified to that terminal.
How does the "B" suffix differ from "C" in the BZX8450 series?
The "B" suffix denotes ±2 % voltage tolerance (e.g., BZX8450-B4V3R: 4.21–4.39 V), while "C" indicates approximately ±5 % tolerance (e.g., BZX8450-C4V3: 4.09–4.52 V). Both share identical package, power rating, and thermal characteristics, but only "B" parts implement the intentional leakage current optimization described in AN90031 for enhanced noise and switching performance.
Is this part suitable for automotive applications?
No - the BZX8450-B4V3R is not automotive-qualified. The Nexperia datasheet explicitly states in Section 14 ("Non-automotive qualified products") that unless expressly marked as AEC-Q200 qualified, these devices are not tested or warranted for automotive use. Its qualification covers industrial and consumer temperature ranges (−55 °C to +150 °C), but it lacks automotive-specific reliability testing, traceability, and change control protocols required for vehicle systems.
BZX8450-B4V3R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX8450
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 4.3 V
- Tolerance:
- ±2%
- Power - Max:
- 250 mW
- Impedance (Max) (Zzt):
- 95 Ohms
- Current - Reverse Leakage @ Vr:
- 4 µA @ 2 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-B4V3R FAQ
1.How can I place an order for BZX8450-B4V3R through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX8450-B4V3R 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-B4V3R reliable?
The price and inventory of BZX8450-B4V3R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX8450-B4V3R is usually 5 days.
3.What payment methods are accepted for BZX8450-B4V3R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX8450-B4V3R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX8450-B4V3R?
BZX8450-B4V3R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX8450-B4V3R 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-B4V3R?
For technical support, including BZX8450-B4V3R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX8450-B4V3R requirements.
6.How does Aetrix verify that BZX8450-B4V3R is sourced from the original manufacturer or authorized distributors?
All BZX8450-B4V3R 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-B4V3R meets industry standards.
7.What is the process for return or replacement of BZX8450-B4V3R?
All BZX8450-B4V3R units undergo pre-shipment inspection (PSI). If there is an issue with BZX8450-B4V3R, 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-B4V3R part is unused and in its original packaging.
Return procedure for BZX8450-B4V3R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX8450-B4V3R 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…
