My Inquiry
My Account
Nexperia USA Inc. BZX84W-C12X
- Part No.:
- BZX84W-C12X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84W-C12X.pdf
- Description:
- DIODE ZENER 12V 275MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:5,411
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BZX84W-C12X from Nexperia is a ±5 % tolerance Zener voltage regulator diode with nominal 12 V breakdown voltage, 150 Ω differential resistance at 5 mA, 8.4 mV/K temperature coefficient, and 275 mW total power dissipation in SOT323 (SC-70) package; used for precision voltage reference and overvoltage protection in low-power analog sensor interfaces.
For engineers reviewing the BZX84W-C12X datasheet, BZX84W-C12X pinout, BZX84W-C12X application, or BZX84W-C12X equivalent, this page delivers verified Zener parameters, terminal mapping, thermal behavior, and direct substitution guidance for stable 12 V regulation in space-constrained PCBs.
Technical Context
This Zener diode operates in reverse-bias breakdown mode with a specified 12 V nominal Zener voltage at 5 mA test current and exhibits a positive temperature coefficient of +8.4 mV/K, indicating increasing VZ with junction temperature. Its 150 Ω differential resistance ensures predictable regulation slope under varying load currents.
The device is rated for 200 mA maximum forward current and 40 W non-repetitive peak reverse power dissipation (100 µs pulse), while thermal resistance from junction to ambient is 455 K/W on standard FR4 PCB-critical for derating in thermally constrained layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 12 V nominal at IZ = 5 mA; ±5 % tolerance (11.4–12.7 V range) |
| Differential Resistance rdif | 150 Ω max at IZ = 5 mA; defines regulation linearity and output impedance |
| Temperature Coefficient SZ | +8.4 mV/K at IZ = 5 mA; quantifies VZ drift per °C rise in Tj |
| Total Power Dissipation Ptot | 275 mW at Tamb = 25 °C on FR4 PCB; sets continuous DC power limit |
| Reverse Current IR | 100 nA max at VR = 8 V; determines leakage-induced error in high-impedance bias networks |
| Forward Voltage VF | 0.9 V max at IF = 10 mA; defines conduction loss when used in series forward configuration |
| Junction Temperature Tj | −55 °C to +150 °C operating range; constrains thermal design margin in sealed enclosures |
Pinout & Package
SOT323 (SC-70) leadless surface-mount plastic package: 1.35 mm × 1.75 mm footprint, 0.95 mm height, 3-terminal configuration with exposed pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Forward current entry point; connects to lower-potential node in reverse-bias regulation |
| 2 | Not Connected (n.c.) | Electrically isolated internal terminal; must remain unconnected on PCB |
| 3 | Cathode (K) | Reverse-bias voltage reference node; connects to regulated output or feedback point |
Key Features
| Feature | Design Value |
|---|---|
| ±5 % Zener voltage tolerance | Enables accurate 12 V reference without post-production trimming in cost-sensitive consumer designs |
| 150 Ω differential resistance | Supports stable regulation across ±1 mA load variation without significant VZ shift |
| +8.4 mV/K temperature coefficient | Allows predictable VZ compensation in temperature-critical analog front-ends |
| 275 mW power rating on FR4 | Permits use in 12 V rail clamping without heatsinking in compact IoT sensor nodes |
| SOT323 ultra-small footprint | Reduces board area by >50 % vs. DO-35 or SOD-123 packages for high-density mixed-signal PCBs |
Applications
| Industrial Sensor Signal Conditioning | USB-C Port Overvoltage Protection |
|---|---|
Use Scenario: Stabilizing reference voltage for 12-bit ADCs in factory-floor temperature transmitters. IC Role / Device Role / Timing Role: Zener voltage reference providing stable 12 V bias to op-amp gain stage and ADC reference divider. Use Value: 100 nA leakage at 8 V ensures <0.1 % error in 1 MΩ bias network; 150 Ω rdif limits full-scale error to <0.5 LSB across 0–50 °C. |
Use Scenario: Clamping transient surges on VBUS line during hot-plug events in portable docking stations. IC Role / Device Role / Timing Role: Standby-mode Zener clamp absorbing 40 W non-repetitive pulses before TVS activation. Use Value: 40 W peak surge rating (100 µs) handles USB-C ESD bursts without degradation; SOT323 footprint fits tight layout near connector. |
| Automotive Cabin Control Panel | Medical Wearable Battery Monitoring |
Use Scenario: Regulating 12 V supply for microcontroller I/O logic in HVAC control modules. IC Role / Device Role / Timing Role: Low-power Zener shunt regulator maintaining clean 12 V rail during ignition noise transients. Use Value: 275 mW continuous rating sustains regulation during 100 ms load dumps; +8.4 mV/K SZ matches MCU VREF drift for consistent ADC readings. |
Use Scenario: Providing precise 12 V reference for lithium-ion cell voltage monitoring in ECG patches. IC Role / Device Role / Timing Role: High-stability Zener reference enabling ±10 mV battery voltage measurement accuracy. Use Value: ±5 % VZ tolerance and 150 Ω rdif ensure <15 mV total error across 0–45 °C operating range; 0.9 V VF allows bidirectional fault detection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor MMBZ5242B | 12 V ±5 %, 150 Ω rdif, but 350 mW Ptot and SOT23 package | Higher power rating suits higher-current shunt designs; larger SOT23 footprint increases board area | Select when >275 mW continuous dissipation is required and SOT23 layout space is available |
| Vishay BZX84-C12 | Identical 12 V ±5 % spec, but 350 mW Ptot and 170 Ω rdif max | Higher power and slightly higher impedance suit general-purpose regulation where precision is secondary | Choose for legacy compatibility or where 350 mW margin justifies 20 % larger SOT23 footprint |
Compared with BZX84W-C12X, MMBZ5242B offers +75 mW power headroom in SOT23, while BZX84-C12 trades 20 % higher rdif for +75 mW rating-both sacrifice the ultra-compact SOT323 size critical for wearables and miniaturized sensors.
Availability
BZX84W-C12X is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, USB-C port overvoltage protection, and medical wearable battery monitoring requiring stable component supply across production lifecycles.
Supply support for BZX84W-C12X 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 precision voltage regulation and transient suppression in space-constrained, cost-sensitive applications using ultra-small SOT323 packaging.
FAQ
What is the maximum reverse voltage the BZX84W-C12X can withstand before breakdown?
The BZX84W-C12X has a nominal Zener voltage of 12 V at 5 mA test current, with a guaranteed range of 11.4 V to 12.7 V due to its ±5 % tolerance. It begins controlled reverse breakdown within this band and is not rated for sustained operation above 12.7 V without exceeding power limits or risking instability.
Can the BZX84W-C12X be used in series with other Zeners to achieve higher reference voltages?
Yes, BZX84W-C12X can be cascaded in series to generate higher reference voltages, but total power dissipation must remain within 275 mW per device, and cumulative tolerance (±5 % each) compounds-e.g., two in series yields 24 V ±7.1 % worst-case. Thermal coupling between devices also affects stability.
Why does Pin 2 show "n.c." and how should it be handled on the PCB?
Pin 2 is an internal no-connect terminal with no electrical function; it must remain unconnected on the PCB layout. Soldering or routing to this pad violates the SOT323 mechanical specification and may cause solder bridging or mechanical stress during reflow-follow Nexperia's recommended footprint with isolated pad 2.
How does the +8.4 mV/K temperature coefficient affect long-term voltage reference accuracy?
A +8.4 mV/K coefficient means VZ increases by 8.4 mV per °C rise in junction temperature. Over a 100 °C range (−25 °C to +75 °C), this causes ~840 mV drift-requiring system-level compensation if sub-1 % reference stability is needed. For fixed-temperature environments, it enables predictable calibration offsets.
BZX84W-C12X 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):
- 12 V
- Tolerance:
- ±5%
- Power - Max:
- 275 mW
- Impedance (Max) (Zzt):
- 25 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 8 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-C12X FAQ
1.How can I place an order for BZX84W-C12X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84W-C12X 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-C12X reliable?
The price and inventory of BZX84W-C12X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84W-C12X is usually 5 days.
3.What payment methods are accepted for BZX84W-C12X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-C12X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84W-C12X?
BZX84W-C12X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84W-C12X 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-C12X?
For technical support, including BZX84W-C12X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-C12X requirements.
6.How does Aetrix verify that BZX84W-C12X is sourced from the original manufacturer or authorized distributors?
All BZX84W-C12X 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-C12X meets industry standards.
7.What is the process for return or replacement of BZX84W-C12X?
All BZX84W-C12X units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-C12X, 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-C12X part is unused and in its original packaging.
Return procedure for BZX84W-C12X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84W-C12X 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…
