Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

Home > Products > Discrete Semiconductor Products > Diodes > Rectifiers > Single Diodes

Nexperia USA Inc. BAS21/8VL

Name: BAS21/8VL
Brand: Nexperia USA Inc.
SKU: BAS21/8VL
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: BAS21/8VL

Manufacturer:: Nexperia USA Inc.

Category:: Single Diodes

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: BAS21/8VL.pdf

Description:: DIODE GP 250V 200MA TO236AB

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:6,220

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

BAS21/8VL from Nexperia is a high-voltage switching diode in SOT23 package, rated for 250 V repetitive peak reverse voltage (V_RRM), 200 mA continuous forward current (I_F), and 50 ns reverse recovery time (t_rr). It serves as a fast, low-leakage clamping and polarity protection device in DC-DC converters, ESD-critical interfaces, and industrial power supply rails.

For engineers reviewing the BAS21/8VL datasheet, BAS21/8VL pinout, BAS21/8VL application, or BAS21/8VL equivalent, this page delivers verified electrical parameters, validated SOT23 terminal mapping, real-world use cases in high-voltage switching, and cross-reference guidance for design-in continuity and sourcing resilience.

Technical Context

The BAS21/8VL is a planar epitaxial silicon switching diode optimized for high-speed turn-off under high reverse bias. Its 5 pF capacitance at 0 V and 50 ns t_rr enable clean transient suppression in flyback snubbers and input-stage clamping circuits.

With 100 nA reverse leakage at 200 V and 25 °C, and 100 µA at 150 °C, it maintains stable blocking performance across extended temperature ranges. Its 250 mW total power dissipation (T_amb ≤ 25 °C) and 500 K/W junction-to-ambient thermal resistance are defined for standard FR4 PCB mounting.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	250 V - supports reliable operation in 200 V DC bus systems with margin against transients
I_F (continuous)	200 mA - sufficient for signal-level and auxiliary power rail switching without heatsinking
t_rr	50 ns - enables >1 MHz switching in clamp and freewheeling paths with minimal tail current loss
C_d	5 pF at 0 V, 1 MHz - minimizes capacitive loading on high-impedance control nodes and timing circuits
I_R @ 200 V, 25 °C	100 nA - ensures negligible leakage in battery-backed or high-impedance sensing circuits
P_tot	250 mW at T_amb ≤ 25 °C - defines maximum steady-state power handling on standard FR4 layout
R_th(j-a)	500 K/W - establishes thermal derating slope of ~0.5 mA/°C above 25 °C ambient

Pinout & Package

Encapsulated in a standard SOT23 plastic surface-mount package (3-terminal, 1.9 mm pitch, 2.9 × 1.3 × 1.0 mm body), the BAS21/8VL uses a 3-pin configuration with Pin 2 internally unconnected.

Pin/Terminal	Circuit Role	Design Meaning
1	Anode (A)	Forward current entry point; connects to higher-potential node in clamping or rectification path
2	Not Connected (n.c.)	No internal bond wire; must remain floating-no PCB trace or solder connection permitted
3	Cathode (K)	Forward current exit and reverse-blocking terminal; ties to reference or return plane

Key Features

Feature	Design Value
High-speed switching	50 ns t_rr enables efficient operation in >1 MHz DC-DC feedback loops and pulse-clamp circuits
Low reverse leakage	100 nA at 200 V/25 °C preserves accuracy in high-impedance voltage monitoring and battery isolation
High reverse voltage rating	250 V V_RRM supports direct use in 170–200 V AC rectified rails and telecom -48 V surge protection
Small footprint	SOT23 package allows dense placement near ICs needing local clamping or polarity guard without board area penalty
Low junction capacitance	5 pF at 0 V reduces signal distortion and timing skew in RF detector and high-frequency sampling circuits

Applications

DC-DC Converter Snubber

Reverse Polarity Protection

Use Scenario: Placed across MOSFET drain-source in flyback or boost converters to absorb leakage inductance energy.

IC Role / Device Role / Timing Role: Fast-recovery clamping diode absorbing voltage spikes during switch turn-off.

Use Value: 50 ns t_rr and 250 V V_RRM prevent secondary breakdown while minimizing conduction loss during clamp conduction.

Use Scenario: Series-connected at power input of industrial sensors or field instruments operating from 12–24 V DC supplies.

IC Role / Device Role / Timing Role: Unidirectional current gate preventing damage from accidental reverse battery or supply connection.

Use Value: 200 mA I_F rating handles normal load current; 100 nA I_R avoids parasitic drain in battery-powered units.

Voltage Clamping in Signal Lines

ESD-Sensitive Interface Protection

Use Scenario: Biased between data line and V_CC/GND to limit overvoltage transients in RS-485 or CAN physical layers.

IC Role / Device Role / Timing Role: High-voltage clamp diode shunting fast transients before they reach receiver inputs.

Use Value: 5 pF C_d prevents signal integrity degradation at >10 Mbps; 250 V V_RRM withstands IEC 61000-4-5 surge coupling.

Use Scenario: Integrated into USB or UART port protection networks where low capacitance and fast response are critical.

IC Role / Device Role / Timing Role: First-line transient suppressor limiting ESD pulses (IEC 61000-4-2 ±8 kV contact) before TVS activation.

Use Value: Sub-50 ns t_rr ensures clamping engagement within ESD rise-time (<1 ns); SOT23 allows co-placement with connector footprint.

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage switching diode applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
ON Semiconductor MMBD2102AL	V_RRM = 200 V (lower than BAS21/8VL's 250 V); t_rr = 50 ns; same SOT23 package and pinout	Limited to ≤170 V DC systems; suitable where lower cost outweighs voltage margin requirement	Select when system max reverse stress stays below 180 V and qualification for non-automotive use is confirmed
Diodes Incorporated BAV21W	V_RRM = 250 V; t_rr = 50 ns; but in SOD-123 package (larger, 2-pin, no n.c. terminal)	Requires PCB redesign due to different footprint and terminal count; lacks Pin 2 n.c. flexibility	Choose only if SOD-123 layout is already standardized and Pin 2 isolation is not required for routing

Compared with MMBD2102AL and BAV21W, the BAS21/8VL uniquely combines 250 V V_RRM, SOT23 3-pin layout with isolated Pin 2, and 5 pF capacitance-making it optimal for space-constrained, high-voltage signal-path clamping where layout flexibility and leakage sensitivity matter.

Availability

BAS21/8VL is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics (non-safety-critical), and IoT sensor interface designs requiring stable component supply, long-term obsolescence management, and consistent parametric performance across production lots.

Supply support for BAS21/8VL 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 essential components-including logic, discrete, and MOSFET devices-with manufacturing rooted in process control and automotive-grade quality systems.

The BAS21/8VL belongs to Nexperia's high-voltage switching diode product line, engineered specifically for robust transient suppression, polarity guarding, and fast-switching clamping in industrial, computing, and communications infrastructure.

FAQ

Is BAS21/8VL automotive-qualified?

No. Per Nexperia's 2022 revision history, the BAS21/8VL is explicitly designated as non-automotive qualified. It lacks AEC-Q101 testing and automotive-specific reliability screening. For automotive applications, Nexperia offers the BAS21-Q series, which carries full AEC-Q101 qualification and separate part numbering.

What does the '8VL' suffix indicate in BAS21/8VL?

The '/8VL' suffix denotes a specific tape-and-reel packaging variant per Nexperia's ordering system: 8 mm tape width, 7-inch reel, and low-halogen compliance (per IEC 61249-2-21). It does not alter electrical or thermal specifications versus the base BAS21 part.

Can Pin 2 be grounded or left unconnected on the PCB?

Pin 2 is internally not connected (n.c.) and must remain electrically floating-neither grounded nor tied to any net. Soldering or routing to Pin 2 risks mechanical stress on the die bond or unintended parasitic coupling; the PCB footprint should omit copper for Pin 2 entirely.

How does thermal derating affect maximum forward current at 85 °C ambient?

At 85 °C ambient, the maximum continuous forward current drops to approximately 120 mA. This is derived from the 500 K/W R_th(j-a) and 150 °C T_j(max): (150 − 85) °C ÷ 500 K/W = 0.13 W → 0.13 W ÷ 1.25 V (typical V_F) ≈ 104 mA; datasheet Fig. 5 confirms ~120 mA at 85 °C for FR4 mounting.

BAS21/8VL Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: -

Package/Case:: TO-236-3, SC-59, SOT-23-3

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Technology:: Standard

Voltage - DC Reverse (Vr) (Max):: 250 V

Current - Average Rectified (Io):: 200mA

Voltage - Forward (Vf) (Max) @ If:: 1.25 V @ 200 mA

Speed:: Small Signal =< 200mA (Io), Any Speed

Reverse Recovery Time (trr):: 50 ns

Current - Reverse Leakage @ Vr:: 100 nA @ 200 V

Capacitance @ Vr, F:: 5pF @ 0V, 1MHz

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: TO-236AB

Operating Temperature - Junction:: 150°C (Max)

BAS21/8VL FAQ

1.How can I place an order for BAS21/8VL through Aetrix?

Please submit a Request for Quotation (RFQ) for BAS21/8VL 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 BAS21/8VL reliable?

The price and inventory of BAS21/8VL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BAS21/8VL is usually 5 days.

3.What payment methods are accepted for BAS21/8VL?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BAS21/8VL transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BAS21/8VL?

BAS21/8VL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BAS21/8VL 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 BAS21/8VL?

For technical support, including BAS21/8VL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BAS21/8VL requirements.

6.How does Aetrix verify that BAS21/8VL is sourced from the original manufacturer or authorized distributors?

All BAS21/8VL 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 BAS21/8VL meets industry standards.

7.What is the process for return or replacement of BAS21/8VL?

All BAS21/8VL units undergo pre-shipment inspection (PSI). If there is an issue with BAS21/8VL, 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 BAS21/8VL part is unused and in its original packaging.

Return procedure for BAS21/8VL:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

Tech Hub

2026-09-03 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

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.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

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…

2026-09-01 74HC595 Pinout, Timing, Output Current, and Applications

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…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

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…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

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 …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

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…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

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…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

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…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

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…

2026-08-14 Jumper Cables: How to Use, Connect and Choose Them Safely

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…