My Inquiry
My Account
Nexperia USA Inc. BZX84W-C47X
- Part No.:
- BZX84W-C47X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84W-C47X.pdf
- Description:
- DIODE ZENER 47V 275MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:9,755
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BZX84W-C47X from Nexperia is a ±5 % tolerance Zener voltage regulator diode in SOT323 (SC-70) package, rated for 47 V nominal Zener voltage at 2 mA test current, 275 mW total power dissipation on FR4 PCB, and 150 °C maximum junction temperature. It serves as a precision reference or overvoltage clamp in low-power analog signal conditioning and power rail stabilization circuits.
For engineers reviewing the BZX84W-C47X datasheet, BZX84W-C47X pinout, BZX84W-C47X application, or BZX84W-C47X equivalent, key selection criteria include Zener voltage tolerance (±5 %), differential resistance (375 Ω at IZ = 2 mA), temperature coefficient (+46.1 mV/K), reverse leakage (50 nA at 0.7 × VZnom), and SOT323 thermal resistance (455 K/W).
Technical Context
This Zener diode operates in reverse breakdown to maintain stable voltage across its cathode-anode terminals under varying load or supply conditions. Its 47 V nominal regulation point targets mid-range voltage reference needs where tighter tolerance than standard ±5 % is not required but thermal stability and high-frequency response are critical.
The device exhibits a positive temperature coefficient of +46.1 mV/K at IZ = 2 mA, indicating voltage increases with junction temperature - a key consideration in thermally unmanaged designs. Its 375 Ω differential resistance at 2 mA defines dynamic impedance during regulation, directly impacting output ripple rejection in shunt-regulated supplies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 44.0 V to 50.0 V at IZ = 2 mA; defines stable regulation range for 47 V nominal reference |
| Differential Resistance rdif | 375 Ω at IZ = 2 mA; determines AC impedance and ripple attenuation in shunt regulation |
| Temperature Coefficient SZ | +46.1 mV/K at IZ = 2 mA; quantifies voltage drift per degree Celsius rise in junction temperature |
| Reverse Leakage IR | 50 nA at VR = 0.7 × VZnom (32.9 V); sets minimum bias current requirement for reliable conduction onset |
| Total Power Dissipation Ptot | 275 mW on FR4 PCB with single-sided copper; limits continuous DC power handling in surface-mount layout |
| Forward Voltage VF | 0.9 V at IF = 10 mA; defines anode-cathode drop when used in forward-biased protection or clamping |
| Junction-to-Ambient Rth(j-a) | 455 K/W in free air on standard FR4 footprint; governs thermal rise under steady-state power dissipation |
Pinout & Package
SOT323 (SC-70) leadless surface-mount plastic package with 3 terminals; compact 2.2 mm × 1.35 mm footprint optimized for high-density PCB layouts and reflow/wave soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Forward-biased terminal; connects to lower-potential node in Zener operation (reverse-biased configuration) |
| 2 | Not Connected (n.c.) | Electrically isolated internal pad; no circuit function - must remain unconnected in layout |
| 3 | Cathode (K) | Reverse-biased terminal; connects to higher-potential node to enable Zener breakdown and voltage regulation |
Key Features
| Feature | Design Value |
|---|---|
| ±5 % Zener voltage tolerance | Enables cost-effective voltage referencing where tight regulation (±2 %) is unnecessary |
| 47 V nominal working voltage | Targets intermediate bus monitoring and overvoltage protection in 48 V systems and industrial power rails |
| 375 Ω differential resistance at 2 mA | Provides predictable dynamic impedance for filtering noise and stabilizing feedback loops |
| +46.1 mV/K temperature coefficient | Supports predictable thermal drift modeling in ambient-temperature-varying applications |
| 275 mW power rating on FR4 | Allows direct integration into low-power analog boards without heatsinking or derating |
Applications
| Power Rail Clamping | Reference Voltage Generation |
|---|---|
Use Scenario: Protecting 48 V DC input stage of industrial sensor interface against transient surges exceeding 55 V. IC Role / Device Role / Timing Role: Shunt-connected Zener diode clamping excess voltage to 47 V ±5 %, diverting surge current away from downstream LDOs and ADC front-ends. Use Value: Limits peak voltage to within safe operating range of 50 V-rated components using only passive, non-latching protection with <50 nA leakage at standby. |
Use Scenario: Providing stable 47 V reference for high-side current sense amplifier calibration in motor drive control board. IC Role / Device Role / Timing Role: Zener diode biased at 2 mA to deliver precise, low-drift reference voltage to op-amp input network. Use Value: Delivers ±5 % initial accuracy and +46.1 mV/K thermal coefficient enabling predictable offset compensation across −40 °C to +125 °C ambient range. |
| Signal Level Translation | Overvoltage Detection Threshold |
Use Scenario: Translating 0–5 V microcontroller GPIO output to 0–47 V logic-compatible level for driving external relay driver IC. IC Role / Device Role / Timing Role: Anode grounded, cathode pulled to 47 V via resistor; acts as voltage translator by switching conduction at Zener threshold. Use Value: Enables simple, low-component-count level shift with defined 47 V turn-on point and sub-1 µA standby current below regulation voltage. |
Use Scenario: Triggering fault shutdown in telecom power module when output exceeds 47 V due to feedback loop failure. IC Role / Device Role / Timing Role: Cathode connected to monitored rail, anode to comparator input; reverse leakage current rises sharply above VZ, signaling overvoltage condition. Use Value: Provides passive, self-contained detection with 50 nA leakage at 32.9 V and measurable current jump >10× at 47 V, eliminating need for active supervisor IC. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84W-B47 | ±2 % tolerance (46.1–47.9 V), lower differential resistance (375 Ω → 375 Ω same, but tighter VZ spread), identical package and thermal specs | Preferred where tighter initial accuracy is required for calibration-critical references | Select BZX84W-B47 if system-level calibration tolerances demand <±2 % VZ variation; otherwise BZX84W-C47X offers cost advantage with same thermal and dynamic performance. |
| MMBZ5268BS | 47 V ±5 %, SOT323 package, but higher Ptot = 300 mW and lower rdif = 300 Ω at 20 mA (not 2 mA); different test current basis | Better suited for higher-current shunt regulation (>5 mA), less optimal for low-IZ reference use | Choose MMBZ5268BS only if operating at ≥5 mA bias current and requiring lower dynamic impedance; BZX84W-C47X is superior for 2 mA–5 mA precision reference roles. |
Compared with BZX84W-B47, the C47X trades ±2 % initial accuracy for broader tolerance at equal cost-efficiency, while versus MMBZ5268BS it prioritizes low-current stability over high-current dynamic performance - making it optimal for 2 mA–5 mA reference and clamping in space-constrained industrial PCBs.
Availability
BZX84W-C47X is available at Aetrix Electronics and suitable for industrial sensor interfaces, telecom power supervision, and embedded analog reference circuits requiring stable component supply, consistent parametric performance, and long-term SMT manufacturability.
Supply support for BZX84W-C47X 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 consumer markets.
The BZX84W series belongs to Nexperia's general-purpose Zener diode product line, engineered for cost-sensitive, high-volume applications demanding stable voltage regulation in ultra-small SOT323 packages across 2.4 V to 75 V range.
FAQ
What is the maximum continuous reverse current the BZX84W-C47X can handle without damage?
The device has no specified maximum continuous reverse current; instead, its safe operation is governed by power dissipation limits. At 25 °C ambient on FR4 PCB, it supports up to 275 mW total power - corresponding to ~5.85 mA at 47 V. Exceeding this causes junction temperature to rise beyond 150 °C, risking permanent degradation. Derating is required above 25 °C per the 455 K/W thermal resistance.
Can BZX84W-C47X be used in forward-bias mode like a standard diode?
Yes - it exhibits 0.9 V forward voltage at 10 mA, matching typical silicon diode behavior. However, its forward characteristics are not characterized beyond that single point, and it lacks guaranteed fast recovery or low leakage in forward conduction. Use is limited to basic clamping or polarity protection where forward VF tolerance and speed are non-critical.
How does the "n.c." pin (Pin 2) affect PCB layout and thermal performance?
Pin 2 is internally unconnected and electrically isolated; it must not be soldered to any net. Leaving it floating maintains thermal isolation between the active die and adjacent copper. The SOT323 footprint design assumes Pin 2 is unused - soldering it risks mechanical stress, thermal mismatch, or unintended parasitic coupling, potentially degrading Zener voltage stability or reliability.
Is BZX84W-C47X qualified for automotive applications?
No - per Nexperia's revision history (Rev. 2, Jan 2023), the BZX84W series is explicitly non-automotive qualified. It lacks AEC-Q200 stress testing and automotive-grade process controls. For automotive use, Nexperia offers separate -Q qualified variants (e.g., BZX84W-C47-Q); BZX84W-C47X is intended solely for industrial, consumer, and commercial equipment.
BZX84W-C47X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX84W
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 47 V
- Tolerance:
- ±5%
- Power - Max:
- 275 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-323
BZX84W-C47X FAQ
1.How can I place an order for BZX84W-C47X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84W-C47X 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-C47X reliable?
The price and inventory of BZX84W-C47X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84W-C47X is usually 5 days.
3.What payment methods are accepted for BZX84W-C47X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-C47X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84W-C47X?
BZX84W-C47X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84W-C47X 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-C47X?
For technical support, including BZX84W-C47X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-C47X requirements.
6.How does Aetrix verify that BZX84W-C47X is sourced from the original manufacturer or authorized distributors?
All BZX84W-C47X 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-C47X meets industry standards.
7.What is the process for return or replacement of BZX84W-C47X?
All BZX84W-C47X units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-C47X, 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-C47X part is unused and in its original packaging.
Return procedure for BZX84W-C47X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84W-C47X 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…
