My Inquiry
My Account
Nexperia USA Inc. BZX84W-B20F
- Part No.:
- BZX84W-B20F
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84W-B20F.pdf
- Description:
- DIODE ZENER 20V 275MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:9,033
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BZX84W-B20F from Nexperia is a ±2 % tolerance Zener voltage regulator diode with nominal 20 V breakdown voltage, 225 Ω differential resistance at 5 mA, and 16.4 mV/K temperature coefficient, housed in a SOT323 (SC-70) package for space-constrained power rail stabilization in portable electronics.
For engineers reviewing the BZX84W-B20F datasheet, BZX84W-B20F pinout, BZX84W-B20F application, or BZX84W-B20F equivalent, this device serves as a precision shunt reference in low-power voltage regulation, overvoltage protection, and biasing circuits where tight voltage tolerance and thermal stability are required.
Technical Context
This Zener diode operates in reverse breakdown to maintain a stable 20 V reference across its cathode–anode terminals under controlled current conditions. Its ±2 % tolerance ensures initial accuracy within ±0.4 V at 25 °C, and its positive 16.4 mV/K temperature coefficient enables predictable drift compensation in temperature-varying environments.
The device delivers 275 mW total power dissipation on FR4 PCB with single-sided copper, supports up to 200 mA forward current, and exhibits 60 nA reverse leakage at 14 V (0.7 × VZnom). Its 1.5 pF junction capacitance at 1 MHz and 0 V bias suits high-frequency decoupling and noise-sensitive analog references.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 19.6 V to 20.4 V at IZ = 5 mA - defines regulated output voltage range for precision shunt reference design |
| Tolerance | ±2 % - guarantees initial voltage accuracy without post-manufacturing trimming |
| Differential Resistance (rdif) | 225 Ω max at IZ = 5 mA - determines load regulation sensitivity and output impedance in feedback paths |
| Temperature Coefficient (SZ) | +16.4 mV/K - enables predictable voltage drift vs. ambient temperature for thermal compensation planning |
| Reverse Leakage Current (IR) | 60 nA max at VR = 14 V - ensures minimal quiescent current draw in standby or battery-powered circuits |
| Junction Capacitance (Cd) | 1.5 pF at f = 1 MHz, VR = 0 V - supports high-frequency filtering and minimizes signal coupling in RF-adjacent layouts |
| Total Power Dissipation (Ptot) | 275 mW at Tamb = 25 °C on FR4 - sets maximum continuous power handling for thermal layout sizing |
Pinout & Package
Package: SOT323 (SC-70), leadless surface-mount plastic package with 3 terminals, footprint dimensions per Figure 9 (reflow) and Figure 10 (wave soldering); thermal resistance Rth(j-a) = 455 K/W in free air.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Forward-biased terminal; connects to lower-potential node in shunt regulation configuration |
| 2 | Not Connected (n.c.) | Internally unconnected; must remain floating-no PCB trace or thermal pad connection permitted |
| 3 | Cathode (K) | Reverse-biased terminal; connects to regulated voltage node and current-limiting resistor |
Key Features
| Feature | Design Value |
|---|---|
| ±2 % Zener voltage tolerance | Enables direct use in 20 V reference designs without calibration or external trimming circuitry |
| 1.5 pF junction capacitance | Minimizes high-frequency loading on sensitive nodes such as oscillator bias rails or ADC reference inputs |
| 225 Ω differential resistance | Provides predictable output impedance for stable loop gain in feedback-based regulation circuits |
| 455 K/W junction-to-ambient thermal resistance | Guides minimum copper area requirements for thermal relief on FR4 PCBs in continuous operation |
| Non-repetitive peak reverse power of 40 W | Supports transient overvoltage clamping during ESD or surge events when used with appropriate series impedance |
Applications
| Power Supply Reference | Overvoltage Protection |
|---|---|
|
Use Scenario: Stabilizing 20 V rail in low-power microcontroller subsystems with variable load current. IC Role / Device Role / Timing Role: Shunt voltage reference providing precise 20 V setpoint for LDO feedback or comparator threshold. Use Value: Maintains ±0.4 V regulation over 1–10 mA load range due to 225 Ω rdif, reducing need for active regulation. |
Use Scenario: Clamping transient spikes on 24 V industrial sensor interface lines exposed to inductive switching noise. IC Role / Device Role / Timing Role: Passive overvoltage clamp limiting voltage excursions to ≤20.4 V during fast transients. Use Value: Absorbs 40 W non-repetitive surges (tp ≤ 100 µs) without degradation, protecting downstream analog front-end ICs. |
| Battery Monitoring | Signal Level Shifting |
|
Use Scenario: Scaling 24 V battery voltage to 3.3 V ADC input using resistive divider with Zener-stabilized reference. IC Role / Device Role / Timing Role: Precision voltage reference for ratio-metric divider calibration in battery state-of-charge estimation. Use Value: ±2 % tolerance and +16.4 mV/K TC allow accurate SoC calculation across −40 °C to +85 °C operating range. |
Use Scenario: Biasing logic-level translators between 3.3 V and 20 V domains in programmable logic controllers. IC Role / Device Role / Timing Role: DC level translator establishing stable 20 V reference for high-side gate drive or analog comparators. Use Value: Low 60 nA leakage at 14 V ensures minimal current injection into translator input nodes, preserving signal integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84W-C20 | ±5 % tolerance (19 V–21 V range), higher 250 Ω rdif, same package and thermal specs | Acceptable where ±1 V regulation window suffices and cost sensitivity outweighs precision needs | Select for cost-driven consumer-grade power monitoring where tighter tolerance is unnecessary |
| MMSZ5248B | ±5 % tolerance, 20 V nominal, SOD-123 package, 500 mW Ptot, 23 Ω rdif | Higher power handling but larger footprint; lower rdif improves load regulation at higher currents | Choose when >275 mW continuous dissipation or <100 Ω rdif is required, accepting 2.7 mm × 1.6 mm footprint penalty |
Compared with BZX84W-B20F, BZX84W-C20 trades 2× voltage uncertainty for lower unit cost, while MMSZ5248B offers superior regulation performance and power margin at the expense of board area and thermal path efficiency.
Availability
BZX84W-B20F is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor interfaces, and battery management systems requiring stable component supply with guaranteed long-term continuity.
Supply support for BZX84W-B20F 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, miniaturization, and automotive-grade robustness.
The BZX84W series belongs to Nexperia's general-purpose Zener diode product line, engineered for compact, high-accuracy voltage regulation in space-constrained consumer, industrial, and computing applications.
FAQ
What is the maximum continuous reverse current the BZX84W-B20F can handle without exceeding its power rating?
At 25 °C ambient on a standard FR4 PCB, the BZX84W-B20F sustains up to 13.75 mA continuously (275 mW ÷ 20 V) before reaching its 275 mW total power dissipation limit. Derating applies above 25 °C per its 455 K/W thermal resistance-e.g., at 70 °C ambient, max continuous current drops to ~9.2 mA.
Can the not-connected (n.c.) pin be used for thermal relief or grounding?
No-the Pin 2 (n.c.) terminal is internally unconnected and must remain electrically floating. Connecting it to ground, thermal pad, or any trace violates the SOT323 mechanical and electrical design, risks internal shorting, and invalidates thermal performance data. The datasheet explicitly prohibits any connection to this pin.
How does the +16.4 mV/K temperature coefficient affect regulation accuracy over temperature?
From 25 °C to 85 °C (ΔT = 60 K), the Zener voltage increases by 0.984 V (16.4 mV/K × 60 K), shifting the nominal 20 V regulation point to ~20.98 V. This predictable positive drift allows system designers to compensate via resistor network tuning or select complementary components with negative TC for net-zero drift.
Is BZX84W-B20F suitable for use in automotive applications?
No-this part is explicitly marked non-automotive qualified per Revision History Table 10. It lacks AEC-Q200 qualification, automotive-grade testing, and extended temperature validation. For automotive use, Nexperia offers the -Q qualified BZX84W-Q series; BZX84W-B20F must not be deployed in safety-critical or vehicle-mounted systems.
BZX84W-B20F 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):
- 20 V
- Tolerance:
- ±2%
- Power - Max:
- 275 mW
- Impedance (Max) (Zzt):
- 55 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 14 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-B20F FAQ
1.How can I place an order for BZX84W-B20F through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84W-B20F 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-B20F reliable?
The price and inventory of BZX84W-B20F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84W-B20F is usually 5 days.
3.What payment methods are accepted for BZX84W-B20F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-B20F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84W-B20F?
BZX84W-B20F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84W-B20F 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-B20F?
For technical support, including BZX84W-B20F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-B20F requirements.
6.How does Aetrix verify that BZX84W-B20F is sourced from the original manufacturer or authorized distributors?
All BZX84W-B20F 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-B20F meets industry standards.
7.What is the process for return or replacement of BZX84W-B20F?
All BZX84W-B20F units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-B20F, 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-B20F part is unused and in its original packaging.
Return procedure for BZX84W-B20F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84W-B20F 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…
