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Nexperia USA Inc. BZX84-A18,215
- Part No.:
- BZX84-A18,215
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX84-A18,215.pdf
- Description:
- DIODE ZENER 18V 250MW TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:1,306
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Product details
Overview
BZX84-A18,215 from Nexperia is a ±1 % tolerance Zener voltage regulator diode in SOT23 (TO-236AB) package, designed for precision low-power voltage reference and clamping in space-constrained PCBs. It delivers 17.82 V to 18.18 V nominal breakdown at 5 mA, with 225 Ω max differential resistance, 45 μA max reverse current at 14.4 V, and 12.6 mV/K temperature coefficient - used in power supply feedback loops and overvoltage protection circuits.
For engineers reviewing the BZX84-A18,215 datasheet, BZX84-A18,215 pinout, BZX84-A18,215 application, or BZX84-A18,215 equivalent, this page provides verified Zener voltage, thermal resistance, peak surge capability, tolerance grade, and SOT23 terminal mapping - critical for analog reference stability, ESD clamp design, and low-current regulation validation.
Technical Context
This device operates as a two-terminal silicon Zener diode with controlled avalanche breakdown at 18 V, optimized for stable DC voltage reference under low-current conditions (IZ = 5 mA). Its ±1 % tolerance (BZX84-A series), 250 mW total power dissipation, and 40 W non-repetitive peak reverse power handling enable reliable operation in transient-suppressed bias networks.
The SOT23 package features an anode (Pin 1), unconnected terminal (Pin 2), and cathode (Pin 3), supporting surface-mount reflow assembly. Thermal resistance from junction to ambient is 500 K/W on FR4 PCB, and junction-to-solder-point is 330 K/W - key for thermal derating in compact regulators and clamps.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 17.82 V to 18.18 V at IZ = 5 mA - defines precise regulation point for feedback or clamp threshold |
| Tolerance | ±1 % - enables tight voltage margin control in precision reference designs |
| Differential Resistance (rdif) | ≤225 Ω - determines output impedance and load regulation sensitivity |
| Reverse Current (IR) | ≤45 μA at VR = 14.4 V - ensures low leakage in standby or high-impedance bias networks |
| Temperature Coefficient (SZ) | +12.6 mV/K at IZ = 5 mA - quantifies voltage drift per °C for thermal stability analysis |
| Total Power Dissipation (Ptot) | 250 mW at Tamb ≤ 25 °C - sets maximum continuous DC power limit on standard FR4 PCB |
| Non-repetitive Peak Power (PZSM) | 40 W for tp = 100 μs - supports transient overvoltage suppression without failure |
Pinout & Package
Package: SOT23 (TO-236AB), 3-lead surface-mount plastic package with standard footprint per Figure 12 (reflow) and Figure 13 (wave soldering); dimensions per Figure 11.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Positive terminal for forward conduction; connected to lower-potential node in Zener bias configuration |
| 2 | Not Connected (n.c.) | Internal die pad with no electrical connection - must remain unconnected on PCB layout |
| 3 | Cathode (K) | Negative terminal; reverse-biased to achieve Zener breakdown - tied to regulated output or clamp node |
Key Features
| Feature | Design Value |
|---|---|
| ±1 % Zener voltage tolerance | Enables <180 mV absolute error at 18 V - suitable for closed-loop feedback where reference accuracy directly impacts output regulation |
| 250 mW total power rating | Supports up to 13.9 mA continuous Zener current at 18 V - sufficient for IC biasing and low-power sensor references |
| 40 W non-repetitive peak power | Withstands 2.2 A surge for 100 μs - protects downstream circuitry from ESD or inductive kick events |
| Low 45 μA reverse leakage @ 14.4 V | Minimizes quiescent current draw in battery-powered or high-impedance sensing nodes |
| SOT23 footprint compatibility | Matches industry-standard 3-pin SMT land pattern - enables drop-in replacement and automated assembly |
Applications
| Power Supply Feedback Reference | Overvoltage Clamp Protection |
|---|---|
Use Scenario: Stabilizing output voltage in adjustable linear regulators (e.g., LM317) via resistive divider feedback. IC Role / Device Role / Timing Role: Provides fixed 18 V reference point for error amplifier comparison. Use Value: ±1 % tolerance ensures output voltage deviation remains within ±0.18 V across production units. |
Use Scenario: Limiting voltage spikes on microcontroller I/O lines exposed to inductive loads. IC Role / Device Role / Timing Role: Shunts excess energy to ground when line voltage exceeds 18.2 V. Use Value: 40 W surge rating absorbs 100 μs transients without degradation, preserving signal integrity. |
| Low-Power Sensor Biasing | ADC Reference Stabilization |
Use Scenario: Generating stable excitation voltage for resistive temperature detectors (RTDs) in portable instrumentation. IC Role / Device Role / Timing Role: Supplies regulated 18 V bias to bridge circuit, minimizing self-heating error. Use Value: 225 Ω differential resistance limits current-induced voltage shift to <2.5 mV per 10 μA load variation. |
Use Scenario: Providing clean reference voltage to 12-bit SAR ADCs in data acquisition modules. IC Role / Device Role / Timing Role: Acts as secondary reference source when internal bandgap lacks required stability. Use Value: +12.6 mV/K tempco allows predictable calibration offset correction across –40 °C to +85 °C operating range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor MMBZ5245BS-7-F | 18 V nominal, ±5 % tolerance, 200 mW Ptot, SOT23 package | Higher voltage uncertainty (±0.9 V vs. ±0.18 V) and lower power rating reduce suitability for precision feedback | Select when cost sensitivity outweighs regulation accuracy and thermal margin requirements |
| Vishay BZX84-C18-TP | 18 V nominal, ±5 % tolerance, 300 mW Ptot, same SOT23 footprint | Looser tolerance increases output variation; higher power rating enables greater surge margin but adds thermal mass | Prefer for non-critical clamping where 18 V ±0.9 V is acceptable and 300 mW headroom improves reliability under sustained load |
Compared with BZX84-A18,215, MMBZ5245BS-7-F trades precision for cost, while BZX84-C18-TP sacrifices voltage accuracy for higher power handling - making the A-grade part optimal for applications demanding tight regulation and known thermal behavior.
Availability
BZX84-A18,215 is available at Aetrix Electronics and suitable for power supply feedback references, overvoltage clamp protection, and low-power sensor biasing requiring stable component supply across industrial, test equipment, and consumer electronics programs.
Supply support for BZX84-A18,215 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 high-volume, high-reliability logic, discrete, and MOSFET solutions, headquartered in Nijmegen, Netherlands.
The BZX84 series belongs to Nexperia's precision Zener diode product line, engineered specifically for low-power voltage regulation and clamping in space-constrained, cost-sensitive applications - emphasizing tight tolerance, repeatable breakdown, and robust SMT manufacturability.
FAQ
What is the maximum continuous Zener current for BZX84-A18,215 at 25 °C ambient?
At 25 °C ambient on a standard FR4 PCB, the maximum continuous Zener current is 13.9 mA, calculated from its 250 mW total power dissipation rating and nominal 18 V breakdown voltage (IZ = Ptot/VZ). Derating is required above 25 °C per the 500 K/W junction-to-ambient thermal resistance.
Is Pin 2 electrically functional in the BZX84-A18,215 SOT23 package?
No, Pin 2 is explicitly marked "n.c." (not connected) in the official Nexperia datasheet. It is an internal lead frame extension with no bond wire or die connection - it must remain unconnected on the PCB to avoid unintended parasitic paths or mechanical stress.
How does the +12.6 mV/K temperature coefficient affect regulation accuracy over temperature?
At IZ = 5 mA, the coefficient causes a +12.6 mV increase in VZ per 1 °C rise in junction temperature. Over a 100 °C range (–40 °C to +60 °C), this results in ~1.26 V total drift - requiring thermal design or calibration if sub-100 mV stability is needed across that span.
Can BZX84-A18,215 be used in place of a 1N4746A in existing designs?
No - the 1N4746A is a 18 V, 1 W through-hole Zener with TO-204AA (DO-41) package and ±5 % tolerance. BZX84-A18,215 has tighter ±1 % tolerance but only 250 mW rating and SOT23 footprint; direct substitution requires verifying power dissipation, thermal layout, and PCB pad compatibility.
BZX84-A18,215 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX84
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 18 V
- Tolerance:
- ±1%
- Power - Max:
- 250 mW
- Impedance (Max) (Zzt):
- 45 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 700 mV
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -65°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-236AB
BZX84-A18,215 FAQ
1.How can I place an order for BZX84-A18,215 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84-A18,215 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 BZX84-A18,215 reliable?
The price and inventory of BZX84-A18,215 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84-A18,215 is usually 5 days.
3.What payment methods are accepted for BZX84-A18,215?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84-A18,215 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84-A18,215?
BZX84-A18,215 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84-A18,215 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 BZX84-A18,215?
For technical support, including BZX84-A18,215 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84-A18,215 requirements.
6.How does Aetrix verify that BZX84-A18,215 is sourced from the original manufacturer or authorized distributors?
All BZX84-A18,215 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 BZX84-A18,215 meets industry standards.
7.What is the process for return or replacement of BZX84-A18,215?
All BZX84-A18,215 units undergo pre-shipment inspection (PSI). If there is an issue with BZX84-A18,215, 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 BZX84-A18,215 part is unused and in its original packaging.
Return procedure for BZX84-A18,215:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84-A18,215 Tags
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MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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BZT52C15-7-F
Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
Micro Commercial Co
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BZT52C3V6LP-7
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SMAZ12-13-F
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