My Inquiry
My Account
Nexperia USA Inc. BZX84W-B15-QX
- Part No.:
- BZX84W-B15-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84W-B15-QX.pdf
- Description:
- DIODE ZENER 15V 275MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:7,788
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BZX84W-B15-QX from Nexperia is a ±2% tolerance Zener voltage regulator diode in SOT323 (SC-70) package, rated for 15 V nominal regulation at 5 mA, with 200 mA maximum forward current and 275 mW total power dissipation on FR4 PCB. It delivers stable reference voltage in automotive power rail monitoring and ECU biasing circuits.
For engineers reviewing the BZX84W-B15-QX datasheet, BZX84W-B15-QX pinout, BZX84W-B15-QX application, or BZX84W-B15-QX equivalent, key selection criteria include Zener voltage tolerance (±2%), junction temperature limit (150 °C), differential resistance (200 Ω max at 5 mA), reverse leakage (50 nA at 10.5 V), and AEC-Q101 qualification for under-hood use.
Technical Context
This Zener diode operates in reverse breakdown to maintain a precise 15 V reference across its cathode-anode terminals when biased above its knee voltage. Its ±2% tolerance and low 200 Ω dynamic impedance ensure tight regulation under varying load currents from 1 mA to 20 mA.
Designed for automotive-grade reliability, it meets AEC-Q101 stress test requirements and features a thermal resistance of 455 K/W (junction-to-ambient, FR4 PCB), enabling operation from −55 °C to +150 °C ambient with full specification compliance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 14.7 V to 15.3 V at IZ = 5 mA - ensures ±2% regulation accuracy for precision reference applications |
| Differential Resistance (rdif) | ≤ 200 Ω at IZ = 5 mA - minimizes output voltage shift under load transients |
| Reverse Leakage (IR) | ≤ 50 nA at VR = 10.5 V - guarantees low standby current in battery-sensitive systems |
| Power Dissipation (Ptot) | 275 mW on FR4 PCB - defines maximum continuous DC power handling without derating |
| Junction Temperature (Tj) | 150 °C maximum - enables reliable operation in high-temperature engine compartment environments |
| Forward Voltage (VF) | ≤ 0.9 V at IF = 10 mA - supports low-loss anode-side clamping or series bias functions |
| Capacitance (Cd) | 2.0 pF at f = 1 MHz, VR = 0 V - preserves signal integrity in high-frequency feedback paths |
Pinout & Package
SOT323 (SC-70) leadless surface-mount plastic package with 3 terminals, footprint dimensions per Figure 9 (reflow): 2.65 mm × 2.35 mm × 0.9 mm height, 0.65 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Anode) | Anode connection | Forward-biased terminal; connects to lower-potential node in reverse-bias regulation configuration |
| 2 (n.c.) | Not connected | Internal die pad with no electrical bond; must remain unconnected in PCB layout |
| 3 (Cathode) | Cathode connection | Reverse-biased terminal; ties to regulated voltage rail or feedback node in shunt regulator topology |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive under-hood use including temperature cycling, humidity, and mechanical shock |
| ±2% Zener voltage tolerance | Enables tighter system-level voltage margin control versus ±5% variants in safety-critical sensing |
| Low 2.0 pF junction capacitance | Minimizes phase shift in high-speed feedback loops and RF bypass applications |
| 150 °C maximum junction temperature | Supports uninterrupted operation in engine control units exposed to sustained 125 °C ambient |
| 275 mW power rating on standard FR4 | Eliminates need for thermal vias or copper pour in space-constrained automotive PCB layouts |
Applications
| Engine Control Unit (ECU) Reference | Automotive Infotainment Power Sequencing |
|---|---|
|
Use Scenario: Providing stable 15 V reference for analog sensor signal conditioning in engine management systems. IC Role / Device Role / Timing Role: Shunt voltage reference for ADC reference buffers and op-amp bias networks. Use Value: ±2% tolerance and 200 Ω dynamic impedance maintain <±10 mV drift over 1–20 mA load variation, ensuring sub-12-bit ADC accuracy. |
Use Scenario: Enabling controlled power-up sequencing of SoC core and I/O rails in head unit designs. IC Role / Device Role / Timing Role: Zener clamp in RC-delayed enable circuit for LDO startup timing. Use Value: Low 50 nA leakage at 10.5 V prevents premature activation, while 275 mW rating sustains surge during hot-swap events. |
| Body Control Module (BCM) Overvoltage Protection | ADAS Camera Module Bias Supply |
|
Use Scenario: Clamping transient spikes on 12 V supply lines feeding microcontrollers and CAN transceivers. IC Role / Device Role / Timing Role: Transient voltage suppressor in parallel with load, triggered above 15.3 V. Use Value: 40 W non-repetitive peak power rating (100 µs pulse) absorbs ISO 7637-2 Pulse 1/2a surges without failure. |
Use Scenario: Generating clean 15 V bias for image sensor analog front-end and lens actuator drivers. IC Role / Device Role / Timing Role: Low-noise shunt regulator upstream of LDO for analog supply domain. Use Value: 2.0 pF capacitance avoids resonance with decoupling caps, preserving PSRR >60 dB up to 100 MHz. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84W-C15-Q | ±5% tolerance (14.25–15.75 V), higher 500 nA leakage at 10.5 V | Acceptable for non-critical biasing where cost sensitivity outweighs precision | Select when system voltage margins exceed ±3% and leakage budget allows ≥500 nA |
| MMSZ5245B-TP | ±5% tolerance, SOD-123 package, 500 mW rating, 350 Ω rdif | Larger footprint and higher dynamic impedance reduce suitability for compact, high-precision layouts | Choose only if board space permits SOD-123 and thermal design accommodates higher Ptot |
Compared with BZX84W-C15-Q and MMSZ5245B-TP, BZX84W-B15-QX offers superior regulation stability (±2% vs ±5%), lower leakage (50 nA vs 500 nA/1 µA), and smaller SOT323 footprint-critical for dense automotive PCBs requiring AEC-Q101 compliance and tight voltage control.
Availability
BZX84W-B15-QX is available at Aetrix Electronics and suitable for automotive ECU reference design, ADAS camera bias supply, and body control module overvoltage protection requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for BZX84W-B15-QX 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, logic, and MOSFET solutions for automotive, industrial, and consumer markets.
BZX84W-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode portfolio, engineered specifically for automotive power rail stabilization, sensor reference, and transient suppression in harsh-environment electronic control units.
FAQ
What is the maximum reverse voltage this Zener can regulate before breakdown?
The BZX84W-B15-QX has a nominal Zener voltage of 15 V with ±2% tolerance, meaning it begins regulating between 14.7 V and 15.3 V at 5 mA test current. Its absolute maximum reverse voltage is not defined separately-the device is designed to operate continuously within its specified VZ range under recommended conditions, with breakdown occurring sharply at the rated VZ point.
Can this diode be used in series with another Zener for higher voltage reference?
No-BZX84W-B15-QX is not intended for series stacking. Its 200 Ω differential resistance and ±2% tolerance are specified for single-device operation. Cascading introduces cumulative tolerance error (up to ±4%), mismatched temperature coefficients, and uneven current sharing that degrades regulation accuracy and thermal stability.
Is the "n.c." pin electrically isolated or thermally coupled to the die?
Pin 2 is a mechanical tie-bar with no internal bond wire or silicon connection. It is electrically isolated but provides minor thermal conduction from the die paddle to the PCB. Per Nexperia's package outline, it must remain unconnected in layout-no solder mask opening or trace routing is permitted.
How does its 275 mW rating translate to real-world PCB thermal performance?
The 275 mW rating assumes mounting on standard FR4 with single-sided 1 oz copper, tin-plated, and Nexperia's recommended footprint. Under those conditions, junction temperature rise is ~125 °C (Rth(j-a) = 455 K/W). At 25 °C ambient, this yields a max Tj of 150 °C-matching its absolute maximum rating. Derating is required above 25 °C ambient.
BZX84W-B15-QX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX84W-Q
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 15 V
- Tolerance:
- ±2%
- Power - Max:
- 275 mW
- Impedance (Max) (Zzt):
- 30 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 10.5 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:
- SOT-323
BZX84W-B15-QX FAQ
1.How can I place an order for BZX84W-B15-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84W-B15-QX 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 BZX84W-B15-QX reliable?
The price and inventory of BZX84W-B15-QX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84W-B15-QX is usually 5 days.
3.What payment methods are accepted for BZX84W-B15-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-B15-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84W-B15-QX?
BZX84W-B15-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84W-B15-QX 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 BZX84W-B15-QX?
For technical support, including BZX84W-B15-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-B15-QX requirements.
6.How does Aetrix verify that BZX84W-B15-QX is sourced from the original manufacturer or authorized distributors?
All BZX84W-B15-QX 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 BZX84W-B15-QX meets industry standards.
7.What is the process for return or replacement of BZX84W-B15-QX?
All BZX84W-B15-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-B15-QX, 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 BZX84W-B15-QX part is unused and in its original packaging.
Return procedure for BZX84W-B15-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84W-B15-QX 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…
