Diodes Incorporated BAS40-04T-7-F

Overview

BAS40-04T-7-F from Diodes Incorporated is a surface-mount Schottky barrier diode with 40 V peak repetitive reverse voltage, 200 mA forward current rating, and ultra-fast 5.0 ns reverse recovery time. It features low forward voltage drop (≤380 mV at 1 mA), 5.0 pF junction capacitance at 0 V, and is housed in the ultra-small SOT523 package for space-constrained high-frequency switching applications such as RF detector circuits and portable DC-DC converter flyback clamping.

For engineers reviewing the BAS40-04T-7-F datasheet, BAS40-04T-7-F pinout, BAS40-04T-7-F application, or BAS40-04T-7-F equivalent, key selection criteria include its 40 V V_RRM, sub-1 V V_F performance across 1–40 mA, nanosecond-level trr, ESD-protected PN guard ring, and SOT523 thermal resistance of 833 °C/W under standard FR-4 mounting.

Technical Context

This Schottky diode uses a platinum-silicide (PtSi) or similar low-barrier metal-semiconductor junction to achieve fast switching and low forward conduction loss. Its design integrates a PN junction guard ring to suppress transient-induced avalanche and improve ESD robustness without compromising speed.

The device operates over –55 °C to +125 °C and maintains stable leakage (<200 nA at 30 V) and capacitance (5.0 pF at 0 V, 1 MHz) across temperature and bias-critical for RF envelope detection and high-efficiency synchronous rectification in battery-powered systems.

Key Specifications

Pinout & Package

Package: SOT523 - ultra-compact 3-pin surface-mount plastic package (1.60 × 1.60 × 0.75 mm), rated UL 94V-0, moisture sensitivity level 1, matte tin-plated leads.

Key Features

Applications

Equivalent & Alternatives

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

Compared with NSR0230HT1G and RB520S-40T2R, BAS40-04T-7-F delivers balanced 40 V blocking, 380 mV V_F at 1 mA, and proven guard-ring ESD robustness-making it optimal for general-purpose RF and power-clamp use where voltage margin and transient immunity are critical.

Availability

BAS40-04T-7-F is available at Aetrix Electronics and suitable for RF detection, high-speed logic clamping, DC-DC snubbing, and portable battery protection requiring stable component supply and consistent SOT523 form factor across production lots.

Supply support for BAS40-04T-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 the Americas.

The BAS40 series belongs to Diodes' high-speed Schottky diode product line, engineered specifically for RF, portable power, and signal integrity applications demanding low V_F, fast t_rr, and miniature packaging.

FAQ

What is the maximum junction temperature for BAS40-04T-7-F?

The device has an operating junction temperature range of –55 °C to +125 °C. This is specified in the Absolute Maximum Ratings table and validated per JEDEC JESD22-A104. Derating begins above 25 °C ambient, with full 150 mW power dissipation only permissible at T_A ≤ 25 °C due to its 833 °C/W R_θJA.

Is BAS40-04T-7-F qualified for automotive applications?

No-BAS40-04T-7-F is not AEC-Q101 qualified. The datasheet explicitly states that automotive-grade variants require specific change control, PPAP capability, and IATF 16949 manufacturing; this part is intended for commercial and industrial use. For automotive designs, Diodes offers the AEC-Q101-qualified BAS40-04WQ-7-F variant.

How does the PN guard ring affect ESD performance?

The integrated PN junction guard ring provides transient suppression by diverting ESD current away from the active Schottky junction. Per Diodes' internal testing, this structure enables >4 kV contact discharge (IEC 61000-4-2 Level 2) without parameter shift or failure-critical for handheld and interface-coupled applications.

Can BAS40-04T-7-F replace BAS40T-7-F in a design?

Yes-BAS40-04T-7-F and BAS40T-7-F share identical electrical specifications, package (SOT523), and pinout. The "-04" suffix denotes a specific date-code and marking variant (44 = BAS40-04T), not a functional difference. Both meet the same DS30265 Rev. 14 specification and are interchangeable in all circuit implementations.