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Nexperia USA Inc. BZX84-C20,235
- Part No.:
- BZX84-C20,235
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX84-C20,235.pdf
- Description:
- DIODE ZENER 20V 250MW TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,600
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Product details
Overview
BZX84-C20,235 from Nexperia is a ±5 % tolerance Zener voltage regulator diode in SOT23 (TO-236AB) package, rated for 20 V nominal breakdown voltage at 5 mA, 250 mW total power dissipation, and 150 °C maximum junction temperature - used for precision low-power voltage reference and overvoltage protection in DC power rails and sensor biasing circuits.
For engineers reviewing the BZX84-C20,235 datasheet, BZX84-C20,235 pinout, BZX84-C20,235 application, or BZX84-C20,235 equivalent, key selection criteria include Zener voltage tolerance (±5 %), differential resistance (225 Ω max at IZ = 5 mA), reverse current (≤55 μA at VR = 18.8 V), thermal resistance (500 K/W junction-to-ambient), and non-repetitive surge capability (60 W peak for 100 μs).
Technical Context
This device operates as a two-terminal shunt voltage regulator, maintaining stable output voltage across a load by conducting reverse current when input exceeds its 20 V Zener threshold. Its 225 Ω maximum dynamic impedance ensures predictable regulation under varying load conditions.
Designed for surface-mount use on FR4 PCBs with single-sided 70 µm copper, it delivers 250 mW steady-state dissipation at Tamb ≤ 25 °C and withstands 40 W non-repetitive reverse surges (tp = 100 μs, Tj = 25 °C), supporting transient suppression in compact power management stages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 18.8 V min / 21.2 V max at IZ = 5 mA - defines regulated output range under nominal bias |
| Differential Resistance (rdif) | ≤225 Ω at IZ = 5 mA - determines voltage deviation under load current changes |
| Reverse Current (IR) | ≤55 μA at VR = 18.8 V - sets leakage-induced error in high-impedance reference nodes |
| Total Power Dissipation (Ptot) | 250 mW at Tamb ≤ 25 °C - limits continuous DC power handling on standard PCB layout |
| Junction Temperature (Tj) | −65 °C to +150 °C - enables operation in industrial ambient environments without derating |
| Non-repetitive Peak Power (PZSM) | 40 W for tp = 100 μs - supports ESD/inductive spike clamping in signal conditioning paths |
| Thermal Resistance (Rth(j-a)) | 500 K/W in free air - informs required PCB copper area for thermal management |
Pinout & Package
SOT23 (TO-236AB) plastic surface-mounted package with 3 leads; 1.9 mm × 1.3 mm footprint, 1.1 mm height, and gull-wing lead form for reflow soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Forward-biased terminal; connects to lower-potential side of regulated node |
| 2 | Not Connected (n.c.) | Internal die pad with no electrical connection; must remain unconnected in PCB layout |
| 3 | Cathode (K) | Zener-biased terminal; connects to higher-potential side and regulates voltage relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| ±5 % Zener voltage tolerance | Enables cost-effective voltage referencing where tight regulation is not critical, e.g., supply rail monitoring |
| 250 mW power rating | Supports low-current biasing of op-amps, comparators, and ADC references without external heat sinking |
| 40 W non-repetitive surge rating | Provides transient overvoltage clamping for I/O protection in microcontroller peripheral circuits |
| 150 °C max junction temperature | Allows reliable operation in enclosed industrial enclosures with limited airflow |
| SOT23 package compatibility | Enables automated placement and reflow assembly alongside other SMT components on dense PCBs |
Applications
| Power Supply Rail Monitoring | Sensor Bias Reference |
|---|---|
|
Use Scenario: Monitoring 24 V DC supply stability in PLC I/O modules using a resistive divider into an ADC input. IC Role / Device Role / Timing Role: Zener diode provides fixed 20 V reference point to scale down input voltage while rejecting ripple and noise. Use Value: Enables accurate 12-bit ADC measurement within ±1 % full-scale error despite ±5 % VZ tolerance, due to ratiometric scaling and low IR leakage. |
Use Scenario: Generating stable 20 V bias for a piezoresistive pressure sensor bridge in automotive cabin sensors. IC Role / Device Role / Timing Role: Shunt regulator maintains constant excitation voltage across sensor elements independent of supply variation. Use Value: Limits bridge output drift to <0.05 %/°C via matched temperature coefficient (SZ = +0.05 mV/K) and low rdif-induced loading error. |
| Overvoltage Clamp for MCU GPIO | Low-Power Voltage Reference |
|
Use Scenario: Protecting 3.3 V microcontroller GPIO pins from accidental 24 V field wiring faults in industrial HMI panels. IC Role / Device Role / Timing Role: Fast-acting shunt clamp diverts fault current away from sensitive input structures during transients. Use Value: Absorbs 40 W surge energy (100 μs) without failure, preventing latch-up or gate oxide damage in CMOS inputs. |
Use Scenario: Providing 20 V reference for a low-power 16-bit DAC in battery-operated test equipment. IC Role / Device Role / Timing Role: Passive voltage source delivering stable potential with minimal quiescent current draw. Use Value: Draws only 55 μA reverse leakage at 18.8 V, extending battery life while maintaining <0.1 % reference accuracy over 0–70 °C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor MMBZ5243BLT1G | 20 V nominal, ±5 %, 350 mW Ptot, 100 Ω rdif max at IZ = 20 mA | Higher power rating suits higher-current reference loads; tighter rdif improves regulation linearity | Select when >250 mW continuous dissipation or <100 Ω impedance is required |
| Vishay BZX84-C20-TP | 20 V nominal, ±5 %, 250 mW Ptot, 225 Ω rdif max at IZ = 5 mA, identical SOT23 package | No functional difference; same electrical specs and mechanical form factor | Drop-in replacement with identical performance and board-level compatibility |
Compared with BZX84-C20,235, MMBZ5243BLT1G offers higher power and lower impedance but requires higher test current (20 mA vs. 5 mA); Vishay BZX84-C20-TP matches all key parameters and mounting requirements, making it a direct second-source option.
Availability
BZX84-C20,235 is available at Aetrix Electronics and suitable for industrial control systems, sensor interface modules, and embedded power management circuits requiring stable component supply and long-term production continuity.
Supply support for BZX84-C20,235 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 devices, serving automotive, industrial, and consumer markets with scalable manufacturing and rigorous quality standards.
The BZX84 series belongs to Nexperia's voltage regulator diode product line, engineered specifically for cost-sensitive, space-constrained applications needing dependable low-power voltage stabilization and transient suppression.
FAQ
What is the maximum continuous forward current for BZX84-C20,235?
The device is not intended for continuous forward conduction; its absolute maximum forward current is 200 mA per limiting values table, but typical operation occurs in reverse-bias Zener mode. Forward voltage is specified at 10 mA (VF ≤ 0.9 V), and sustained forward bias risks thermal runaway due to lack of current-limiting structure.
Can BZX84-C20,235 be used in place of a 20 V Zener with tighter tolerance?
No - BZX84-C20,235 has ±5 % tolerance (18.8 V to 21.2 V), whereas tighter alternatives like BZX84-B20 (±2 %, 19.6 V to 20.4 V) or BZX84-A20 (±1 %, 19.8 V to 20.2 V) exist in the same series. Substituting this part in precision reference designs introduces up to ±1.2 V error at nominal conditions.
How does the n.c. pin (Pin 2) affect PCB layout?
Pin 2 is internally unconnected and must remain electrically isolated on the PCB - no trace, pad, or copper pour should contact it. Its presence accommodates standardized SOT23 tooling but contributes no function; bridging it to adjacent nets causes no electrical effect but violates recommended layout practice.
Is BZX84-C20,235 qualified for automotive applications?
No - per Nexperia's revision history (Rev. 7, Jan 2023), the BZX84 series is explicitly designated non-automotive qualified. Automotive-grade equivalents (e.g., BZX84-Q series) undergo additional AEC-Q101 stress testing and have separate part numbering; using this variant in safety-critical vehicle systems voids warranty and violates compliance requirements.
BZX84-C20,235 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):
- 20 V
- Tolerance:
- ±5%
- Power - Max:
- 250 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:
- -65°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-236AB
BZX84-C20,235 FAQ
1.How can I place an order for BZX84-C20,235 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84-C20,235 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-C20,235 reliable?
The price and inventory of BZX84-C20,235 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84-C20,235 is usually 5 days.
3.What payment methods are accepted for BZX84-C20,235?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84-C20,235 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84-C20,235?
BZX84-C20,235 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84-C20,235 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-C20,235?
For technical support, including BZX84-C20,235 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84-C20,235 requirements.
6.How does Aetrix verify that BZX84-C20,235 is sourced from the original manufacturer or authorized distributors?
All BZX84-C20,235 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-C20,235 meets industry standards.
7.What is the process for return or replacement of BZX84-C20,235?
All BZX84-C20,235 units undergo pre-shipment inspection (PSI). If there is an issue with BZX84-C20,235, 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-C20,235 part is unused and in its original packaging.
Return procedure for BZX84-C20,235:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84-C20,235 Tags
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