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

Diodes Incorporated BAS21Q-7-F

Name: BAS21Q-7-F
Brand: Diodes Incorporated
SKU: BAS21Q-7-F
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BAS21Q-7-F

Manufacturer:: Diodes Incorporated

Category:: Single Diodes

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

Datasheet:: BAS21Q-7-F.pdf

Description:: DIODE GP 200V 200MA SOT23-3

Quantity:: RFQ Add To RFQ list

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Inventory:6,459

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Product details

Overview

BAS21Q-7-F from Diodes Incorporated is an AEC-Q101 qualified surface-mount fast switching diode in SOT23 package, rated for 250 V repetitive peak reverse voltage, 400 mA forward continuous current, and 50 ns reverse recovery time. It delivers high conductance and low leakage (15 µA at +100°C), supporting automotive signal routing, ESD protection clamping, and high-speed logic interface isolation.

For engineers reviewing the BAS21Q-7-F datasheet, BAS21Q-7-F pinout, BAS21Q-7-F application, or BAS21Q-7-F equivalent, key selection criteria include its 250 V V_RRM, 50 ns t_rr, AEC-Q101 qualification, SOT23 thermal resistance (500 °C/W), and automotive PPAP capability - critical for under-hood sensor interfaces and power management subsystems.

Technical Context

The BAS21Q-7-F is a silicon planar epitaxial fast-switching diode optimized for high-speed transient response and stable reverse blocking. Its 50 ns reverse recovery time and 5.0 pF junction capacitance at 0 V enable clean signal edge preservation in digital timing paths and clamp circuits.

Designed for automotive-grade reliability, it operates across –55 °C to +150 °C with full IATF 16949 manufacturing control, AEC-Q101 stress testing, and halogen/antimony-free "Green" construction meeting RoHS 3 (2015/863/EU).

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	250 V - supports 200 V DC blocking in automotive 12 V/24 V systems with margin for load dump transients
t_rr	50 ns - enables reliable operation in >1 MHz switching applications such as PWM signal conditioning
I_F	400 mA continuous - sufficient for logic-level signal steering and low-power rail clamping
I_R @ +100°C	15 µA - ensures minimal leakage-induced offset in precision sensor front-ends
C_T @ 0 V	5.0 pF - maintains signal integrity in high-frequency data lines (e.g., CAN FD stubs, LIN bus)
P_D	250 mW - defines maximum dissipation on standard FR-4 with 2 oz copper pad; derates linearly above +25°C
R_θJA	500 °C/W - establishes thermal limit for ambient-referenced power handling in confined PCB layouts

Pinout & Package

Package: SOT23 - surface-mount plastic package (UL 94V-0), 0.008 g mass, moisture sensitivity level 1, lead-free matte tin plating over Alloy 42 leadframe.

Pin/Terminal	Circuit Role	Design Meaning
Anode (Pin 1)	Forward current entry point	Connected to higher-potential node during conduction; polarity-marked on top surface per internal schematic
Cathode (Pin 2)	Forward current exit / reverse blocking terminal	Internally tied to package tab; serves as primary reference for clamping and ESD return path
No-Connect (Pin 3)	Non-functional lead	Structural support only; electrically isolated and must not be bonded or routed

Key Features

Feature	Design Value
AEC-Q101 qualification	Validated for automotive use with temperature cycling, HTRB, and ESD testing per JESD47
Fast 50 ns recovery	Minimizes switching loss and cross-conduction risk in bidirectional signal paths
Low 15 µA IR at +100°C	Preserves accuracy in thermally stressed analog monitoring circuits (e.g., battery voltage sensing)
SOT23 footprint compatibility	Enables drop-in replacement of BAS19/BAS20 series without PCB redesign
Halogen- and antimony-free	Meets automotive OEM green material requirements (<900 ppm Br, <900 ppm Cl, <1000 ppm Sb)

Applications

Automotive Sensor Signal Conditioning

Industrial Digital I/O Protection

Use Scenario: Protecting analog outputs of engine coolant temperature sensors from load dump spikes and reverse battery connection.

IC Role / Device Role / Timing Role: Fast clamping diode placed between sensor output and microcontroller ADC input.

Use Value: 250 V V_RRM withstands ISO 7637-2 Pulse 5a transients; 50 ns t_rr prevents signal distortion during rapid voltage excursions.

Use Scenario: Isolating PLC digital input channels from field-side surge and ESD events.

IC Role / Device Role / Timing Role: Bidirectional transient voltage suppressor in series with optocoupler input LED.

Use Value: Low 5.0 pF capacitance avoids signal rise-time degradation on 100 kHz–1 MHz industrial comms lines.

Automotive Body Control Module (BCM) Logic Interface

Consumer Appliance Power Sequencing

Use Scenario: Level-shifting and reverse-polarity protection for LIN bus transceiver enable signals.

IC Role / Device Role / Timing Role: Unidirectional switch enabling/disabling 5 V logic rails based on 12 V ignition status.

Use Value: 400 mA I_F supports drive strength for multiple downstream buffers; AEC-Q101 ensures lifetime reliability in cabin environment.

Use Scenario: Controlling power-up sequence of MCU and display driver ICs in smart home hubs.

IC Role / Device Role / Timing Role: Delay element via RC network where diode sets asymmetric charge/discharge thresholds.

Use Value: Stable 1.25 V V_F at 200 mA enables predictable timing window generation across –40°C to +85°C ambient.

Equivalent & Alternatives

The following parts are listed as comparable options for similar fast switching diode applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BAS21-7-F	Same electrical specs but not AEC-Q101 qualified; no PPAP or IATF 16949 traceability	Restricted to commercial/industrial use; unsuitable for automotive production	Select when automotive qualification is unnecessary and cost is prioritized
MMBD2102-7-F	Higher V_RRM (350 V), slower t_rr (100 ns), same SOT23 package and RoHS/Green compliance	Better for 48 V systems with lower speed requirements; less suitable for high-frequency signal paths	Choose for enhanced voltage margin where recovery speed is secondary

Compared with BAS21-7-F, the BAS21Q-7-F adds automotive qualification without sacrificing speed or leakage; versus MMBD2102-7-F, it trades 100 V headroom for 2× faster recovery - making it optimal for 12/24 V automotive signal integrity where timing fidelity matters.

Availability

BAS21Q-7-F is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial I/O protection, body control modules, and consumer appliance power sequencing requiring stable component supply and long-term lifecycle assurance.

Supply support for BAS21Q-7-F 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.

The BAS-series fast switching diodes are part of Diodes' automotive-qualified discrete portfolio, engineered specifically for robust signal routing and transient suppression in harsh-environment electronic control units.

FAQ

Is BAS21Q-7-F pin-compatible with BAS20Q-7-F and BAS19Q-7-F?

Yes - all three share identical SOT23 pinout (Anode–Cathode–NC) and mechanical dimensions. Electrical differences lie solely in voltage ratings: BAS19Q-7-F (120 V V_RRM), BAS20Q-7-F (200 V), and BAS21Q-7-F (250 V). No PCB layout change is needed for voltage-tier upgrades.

What is the maximum operating temperature for sustained 400 mA forward current?

At 400 mA, junction temperature must remain ≤ +150 °C. With R_θJA = 500 °C/W and P_D = I_F × V_F ≈ 0.4 A × 1.25 V = 500 mW, ambient must be ≤ +25°C for safe operation. Derating is required above that - e.g., max I_F drops to ~200 mA at +85°C ambient.

Does BAS21Q-7-F require special handling for moisture sensitivity?

No - it is rated Moisture Sensitivity Level 1 per J-STD-020, meaning it may be stored indefinitely at ≤ 30°C/60% RH without baking prior to reflow. Standard SMT assembly processes apply without preconditioning.

Can BAS21Q-7-F be used in place of a Zener diode for voltage clamping?

No - it is a standard PN junction switching diode, not a Zener. Its reverse breakdown is non-regulated (250 V min, uncontrolled slope), making it unsuitable for precision voltage reference or shunt regulation. Use only for transient suppression or polarity protection where controlled clamping is not required.

BAS21Q-7-F Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

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

Packaging:: Tape & Reel (TR)

Product Status:: Active

Technology:: Standard

Voltage - DC Reverse (Vr) (Max):: 200 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:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

Operating Temperature - Junction:: -65°C ~ 150°C

BAS21Q-7-F FAQ

1.How can I place an order for BAS21Q-7-F through Aetrix?

Please submit a Request for Quotation (RFQ) for BAS21Q-7-F 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 BAS21Q-7-F reliable?

The price and inventory of BAS21Q-7-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BAS21Q-7-F is usually 5 days.

3.What payment methods are accepted for BAS21Q-7-F?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BAS21Q-7-F transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BAS21Q-7-F?

BAS21Q-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BAS21Q-7-F 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 BAS21Q-7-F?

For technical support, including BAS21Q-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BAS21Q-7-F requirements.

6.How does Aetrix verify that BAS21Q-7-F is sourced from the original manufacturer or authorized distributors?

All BAS21Q-7-F 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 BAS21Q-7-F meets industry standards.

7.What is the process for return or replacement of BAS21Q-7-F?

All BAS21Q-7-F units undergo pre-shipment inspection (PSI). If there is an issue with BAS21Q-7-F, 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 BAS21Q-7-F part is unused and in its original packaging.

Return procedure for BAS21Q-7-F:

1.Submit a request within 90 days.

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

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