My Inquiry
My Account
Nexperia USA Inc. BZX84W-B12F
- Part No.:
- BZX84W-B12F
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84W-B12F.pdf
- Description:
- DIODE ZENER 12V 275MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:6,826
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BZX84W-B12F from Nexperia is a ±2 % tolerance Zener voltage regulator diode in SOT323 (SC-70) package, rated for 12 V nominal Zener voltage at 5 mA, 275 mW total power dissipation, and 150 °C maximum junction temperature. It provides precision voltage reference and overvoltage clamping in low-power analog signal conditioning and power rail stabilization circuits.
For engineers reviewing the BZX84W-B12F datasheet, BZX84W-B12F pinout, BZX84W-B12F application, or BZX84W-B12F equivalent, this page delivers verified Zener voltage, differential resistance, temperature coefficient, thermal resistance, and reverse leakage specifications - all confirmed from Nexperia's Rev. 2 (Jan 2023) product data sheet.
Technical Context
This Zener diode operates in reverse breakdown to maintain stable voltage across its cathode-anode terminals under controlled current conditions. Its 12 V nominal Zener voltage is specified at IZ = 5 mA with ±2 % tolerance, and exhibits a positive temperature coefficient of +8.4 mV/K at that bias point.
The device features low differential resistance (max 150 Ω at IZ = 5 mA), minimal junction capacitance (2.5 pF at f = 1 MHz, VR = 0 V), and is optimized for high-frequency regulation due to fast response and small SOT323 footprint.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 11.8 V to 12.2 V at IZ = 5 mA - defines precise regulation window for 12 V reference designs |
| Differential Resistance (rdif) | ≤150 Ω at IZ = 5 mA - ensures minimal output voltage shift under load current variation |
| Temperature Coefficient (SZ) | +8.4 mV/K at IZ = 5 mA - quantifies voltage drift per degree Celsius rise in junction temperature |
| Total Power Dissipation (Ptot) | 275 mW on FR4 PCB, single-sided copper - sets maximum continuous DC or average pulsed power handling |
| Reverse Leakage Current (IR) | ≤100 nA at VR = 8 V - guarantees low standby current in high-impedance bias networks |
| Forward Voltage (VF) | ≤0.9 V at IF = 10 mA - enables predictable forward conduction for dual-direction protection schemes |
| Junction-to-Ambient Thermal Resistance (Rth(j-a)) | 455 K/W - determines steady-state temperature rise above ambient at rated power |
Pinout & Package
SOT323 (SC-70) plastic surface-mounted package with three terminals: anode (Pin 1), not connected (Pin 2), and cathode (Pin 3). The NC terminal isolates internal die structure and must remain unconnected in PCB layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Forward current entry / reverse breakdown current exit during Zener operation |
| 2 | Not Connected | Internally isolated; no electrical function - must be left floating on PCB |
| 3 | Cathode | Forward current exit / reverse breakdown current entry - connected to regulated node |
Key Features
| Feature | Design Value |
|---|---|
| ±2 % Zener voltage tolerance | Enables tight regulation without post-production trimming in 12 V reference circuits |
| Low 2.5 pF junction capacitance | Minimizes signal distortion and phase shift in RF biasing and high-frequency clamp applications |
| 150 °C maximum junction temperature | Supports reliable operation in thermally constrained industrial and automotive-adjacent environments |
| 455 K/W thermal resistance (FR4) | Allows accurate thermal modeling for derating in compact PCB layouts with limited copper area |
| Non-repetitive peak reverse power: 40 W (100 µs) | Provides transient overvoltage immunity against ESD and switching spikes without external TVS |
Applications
| Power Rail Stabilization | Reference Voltage Generation |
|---|---|
|
Use Scenario: Maintaining stable 12 V supply for op-amp biasing and sensor excitation in battery-powered IoT nodes. IC Role / Device Role: Shunt regulator that sinks excess current to hold voltage constant at cathode node. Use Value: Delivers ±2 % regulation accuracy with <150 Ω dynamic impedance, reducing need for active LDO in space-constrained designs. |
Use Scenario: Providing precision 12 V reference for ADC voltage dividers and DAC feedback loops in industrial DAQ modules. IC Role / Device Role: Passive voltage reference source with known temperature coefficient (+8.4 mV/K) for drift compensation. Use Value: Enables calibration-aware designs using published SZ data, avoiding costly external temperature sensors. |
| Overvoltage Clamping | High-Frequency Signal Conditioning |
|
Use Scenario: Protecting microcontroller GPIO pins from 15 V transients induced by relay coil flyback in PLC I/O modules. IC Role / Device Role: Fast-acting shunt clamp that conducts above 12.2 V to limit voltage excursion. Use Value: With 40 W non-repetitive surge rating (100 µs), absorbs energy without degradation - eliminates need for series resistor in many cases. |
Use Scenario: Biasing RF amplifier stages in 2.4 GHz ISM-band transceivers where low parasitic capacitance is critical. IC Role / Device Role: DC bias point stabilizer with only 2.5 pF junction capacitance at 0 V reverse bias. Use Value: Prevents detuning of matching networks and maintains gain flatness up to UHF frequencies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C12 | ±5 % tolerance (11.4–12.7 V), higher max rdif (150 Ω vs. 150 Ω typ), identical package and Ptot | Acceptable where 12 V ±5 % meets system margin; less suitable for precision references | Select when cost sensitivity outweighs regulation accuracy requirements |
| MMSZ4687T1G | ±5 % tolerance, 12 V nominal, SOD-123 package, 500 mW Ptot, 300 Ω rdif max | Higher power handling but larger footprint and higher dynamic impedance - trades size for robustness | Choose for higher-current clamping (>20 mA) where board space allows SOD-123 |
Compared with BZX84W-B12F, BZX84-C12 offers lower cost but looser voltage control, while MMSZ4687T1G provides greater power margin at the expense of regulation precision and PCB area - making BZX84W-B12F optimal for miniaturized, accuracy-critical 12 V reference and clamp functions.
Availability
BZX84W-B12F is available at Aetrix Electronics and suitable for power rail stabilization, reference voltage generation, overvoltage clamping, and high-frequency signal conditioning requiring stable component supply and consistent parametric performance across production lots.
Supply support for BZX84W-B12F 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 delivering high-performance, reliable discrete, logic, and MOSFET devices with focus on efficiency and miniaturization.
The BZX84W series belongs to Nexperia's general-purpose Zener diode product line, engineered for precision voltage regulation and transient suppression in space-constrained, high-reliability consumer, industrial, and communications equipment.
FAQ
What is the Zener test current for BZX84W-B12F?
The nominal Zener voltage of 11.8–12.2 V is specified at a test current of 5 mA, as defined in Table 8 of the Nexperia datasheet Rev. 2. This current establishes the operating point for voltage regulation, differential resistance, and temperature coefficient measurements.
Can BZX84W-B12F replace a 12 V Zener in an existing SOT23 design?
No - BZX84W-B12F uses SOT323 (SC-70), which has different pad dimensions, lead pitch (0.65 mm), and terminal count (3 pins, one NC) versus SOT23's 3-pin functional layout. PCB footprint and solder stencil must be redesigned to match the SOT323 outline in Figure 8 of the datasheet.
Is BZX84W-B12F suitable for automotive applications?
No - per Section 13 and Legal Information in the datasheet, this part is non-automotive qualified. Nexperia explicitly states it is not tested or warranted for automotive use; automotive-grade alternatives (e.g., BZX84W-Q series) must be selected for AEC-Q101-compliant designs.
What is the maximum reverse voltage before breakdown begins?
Breakdown onset occurs gradually; the datasheet specifies reverse current ≤100 nA at VR = 8 V (Table 7), confirming sub-100 nA leakage well below nominal Zener voltage. Significant conduction begins near 11.8 V, with full regulation established at 5 mA across 11.8–12.2 V.
BZX84W-B12F 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:
- ±2%
- 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-B12F FAQ
1.How can I place an order for BZX84W-B12F through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84W-B12F 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-B12F reliable?
The price and inventory of BZX84W-B12F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84W-B12F is usually 5 days.
3.What payment methods are accepted for BZX84W-B12F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-B12F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84W-B12F?
BZX84W-B12F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84W-B12F 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-B12F?
For technical support, including BZX84W-B12F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-B12F requirements.
6.How does Aetrix verify that BZX84W-B12F is sourced from the original manufacturer or authorized distributors?
All BZX84W-B12F 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-B12F meets industry standards.
7.What is the process for return or replacement of BZX84W-B12F?
All BZX84W-B12F units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-B12F, 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-B12F part is unused and in its original packaging.
Return procedure for BZX84W-B12F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84W-B12F 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…
