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

STMicroelectronics BAT48

Name: BAT48
Brand: STMicroelectronics
SKU: BAT48
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BAT48

Manufacturer:: STMicroelectronics

Category:: Single Diodes

Package:: DO-204AH, DO-35, Axial

Datasheet:: BAT48.pdf

Description:: DIODE SCHOTTKY 40V 350MA DO35

Quantity:: RFQ Add To RFQ list

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Inventory:8,984

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Product details

Overview

BAT48 from STMicroelectronics is a 40 V, 350 mA surface-mount Schottky barrier diode in SOD-123, SOD-323, or DO-35 packages, featuring low forward voltage (0.4 V at 10 mA), ultrafast switching, and low junction capacitance (18 pF at 1 V). It serves as a general-purpose rectifier or freewheeling diode in compact DC/DC converters, USB power switches, and low-voltage signal clamping circuits.

For engineers reviewing the BAT48 datasheet, BAT48 pinout, BAT48 application, or BAT48 equivalent, key selection criteria include its 0.25 V forward drop at 0.1 mA (enabling ultra-low-current biasing), 25 µA reverse leakage at 40 V, 150 °C max junction temperature, and compatibility with reflow soldering up to 260 °C for SOD-123/SOD-323 variants.

Technical Context

The BAT48 implements a planar Schottky barrier structure optimized for low forward conduction loss and minimal charge storage. Its negligible reverse recovery time (<1 ns) and absence of minority-carrier storage eliminate switching tail current, making it suitable for high-frequency (>1 MHz) flyback snubbing and synchronous rectification assist paths.

Thermal performance is defined by package-dependent junction-to-ambient resistance: 500 °C/W (SOD-123), 550 °C/W (SOD-323), and 300 °C/W (DO-35 on infinite heatsink). The device operates across –40 °C to +150 °C (SOD variants) or +125 °C (DO-35), with UL94 V0 epoxy encapsulation and lead-free compliance per ECOPACK® standards.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	40 V - Maximum repetitive reverse blocking voltage; sets upper limit for clamp or flyback applications
I_F	350 mA continuous - Sustained forward current rating under standard PCB thermal conditions
V_F @ 10 mA	0.4 V typical - Enables efficient low-voltage rectification with <0.04 W conduction loss at 100 mW load
C_j @ 1 V	18 pF - Low capacitance preserves signal integrity in RF detector or high-speed logic clamping
I_R @ 40 V	25 µA at 25 °C - Minimal leakage supports battery-backed circuits and precision reference protection
T_j(max)	+150 °C - Allows operation in thermally constrained automotive cabin modules or industrial motor drives
R_th(j-a)	500 °C/W (SOD-123) - Defines thermal rise per watt on standard FR4 with recommended pad layout

Pinout & Package

Available in three discrete through-hole and surface-mount packages: SOD-123 (2-pin, cathode-banded), SOD-323 (2-pin, cathode-banded), and DO-35 (axial lead, cathode-banded). All configurations use a single anode–cathode terminal pair with polarity indicated by a band on the cathode end.

Pin/Terminal	Circuit Role	Design Meaning
Anode (A)	Forward current entry point	Connected to higher-potential node in rectifier or clamp configuration; must withstand surge current up to 2 A (SOD-123/323)
Cathode (K)	Forward current exit / reverse blocking terminal	Marked by band; ties to ground or lower-potential rail; reverse voltage applied here during blocking state

Key Features

Feature	Design Value
Ultra-low forward voltage	0.25 V at 0.1 mA - Enables biasing of analog sensors or micro-power comparators without loading
Negligible switching losses	No minority-carrier storage - Eliminates reverse recovery energy loss in >500 kHz SMPS designs
Low leakage current	1 µA at 1.5 V reverse - Preserves battery life in always-on IoT endpoint circuits
Surface-mount compatibility	SOD-123/SOD-323 footprints support automated placement and IR reflow (260 °C peak)
High-temperature operation	Rated to +150 °C junction - Suitable for under-hood automotive power management modules

Applications

USB Power Switch Protection

DC/DC Converter Freewheeling

Use Scenario: Preventing backfeed from downstream USB ports during hot-swap events in portable docking stations.

IC Role / Device Role / Timing Role: Unidirectional isolation diode placed between VBUS lines to enforce power flow direction.

Use Value: 0.4 V forward drop minimizes voltage loss across 5 V rail; 18 pF capacitance avoids signal integrity degradation on USB D+/D− lines.

Use Scenario: Freewheeling path in 1 MHz buck converter supplying FPGA core voltage.

IC Role / Device Role / Timing Role: Synchronous rectifier assist or catch diode in non-synchronous topology.

Use Value: Sub-nanosecond reverse recovery prevents shoot-through risk; 350 mA rating supports 2 A peak inductor current with 5:1 duty cycle margin.

Low-Voltage Signal Clamping

Automotive Cabin Sensor Interface

Use Scenario: Protecting ADC inputs of microcontrollers from ESD transients in industrial control panels.

IC Role / Device Role / Timing Role: Bidirectional transient suppressor configured as low-capacitance clamp to V_DD/GND rails.

Use Value: 18 pF capacitance ensures <1% signal attenuation at 10 MHz sensor output; 40 V V_RRM accommodates 24 V system surges.

Use Scenario: Reverse-polarity protection for LIN bus transceivers in vehicle seat control modules.

IC Role / Device Role / Timing Role: Series input protection diode blocking negative supply connection errors.

Use Value: 150 °C max junction temperature supports operation near HVAC ducts; 25 µA leakage at 40 V prevents false wake-up in sleep mode.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
1N5817	DO-41 package; 1 A I_F; 0.45 V V_F @ 1 A; 120 pF C_j	Higher current, larger footprint, slower switching due to higher capacitance	Select when board space allows DO-41 and >500 mA average current is required
SS14	SMA package; 1 A I_F; 0.5 V V_F @ 1 A; 110 pF C_j	Higher power dissipation capability but 6× higher capacitance limits HF use	Prefer for 12 V automotive auxiliary rails where speed is secondary to surge robustness

Compared with BAT48, 1N5817 offers higher current handling but sacrifices high-frequency performance and board-area efficiency; SS14 provides greater thermal margin in TO-277 form but introduces significant capacitive loading unsuitable for signal-path clamping.

Availability

BAT48 is available at Aetrix Electronics and suitable for USB power management, DC/DC converter freewheeling, and low-voltage signal clamping requiring stable component supply across industrial, automotive, and consumer electronics programs.

Supply support for BAT48 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing silicon solutions for smart driving, power management, and embedded processing.

The BAT48 belongs to ST's general-purpose Schottky diode product line, engineered for cost-sensitive, space-constrained applications demanding fast switching, low forward loss, and reliable thermal performance in consumer and industrial power systems.

FAQ

Is BAT48 suitable for reverse polarity protection in 24 V automotive systems?

Yes - BAT48 supports reverse blocking up to 40 V and operates reliably from –40 °C to +150 °C, meeting under-hood thermal requirements. Its 25 µA leakage at 40 V prevents excessive quiescent drain, and SOD-123/SOD-323 variants enable compact PCB layouts compatible with automotive ECU space constraints.

What is the maximum surge current BAT48 can handle?

BAT48 handles 2 A non-repetitive forward surge current (I_FSM) for 10 ms sinusoidal pulses in SOD-123 and SOD-323 packages. This rating applies under T_j = 25 °C initial condition and supports brief inrush events in DC/DC startup or capacitor charging paths without permanent degradation.

Does BAT48 require derating at elevated ambient temperatures?

Yes - continuous forward current must be reduced above 25 °C ambient. For example, at 85 °C ambient on standard FR4 with recommended pads, the SOD-123 variant supports ~180 mA (derated from 350 mA) based on its 500 °C/W R_th(j-a) and 150 °C T_j(max), ensuring safe junction temperature margin.

Can BAT48 replace BAT54 in high-frequency detector circuits?

Yes - BAT48 offers lower capacitance (18 pF vs. BAT54's 30–40 pF) and comparable forward voltage, improving sensitivity and bandwidth in RF envelope detectors or crystal radio applications. Its tighter leakage spec (1 µA at 1.5 V vs. BAT54's 2 µA) also enhances weak-signal accuracy.

BAT48 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: DO-204AH, DO-35, Axial

Packaging:: Tape & Reel (TR)

Product Status:: Active

Technology:: Schottky

Voltage - DC Reverse (Vr) (Max):: 40 V

Current - Average Rectified (Io):: 350mA

Voltage - Forward (Vf) (Max) @ If:: 750 mV @ 200 mA

Speed:: Fast Recovery =< 500ns, > 200mA (Io)

Reverse Recovery Time (trr):: -

Current - Reverse Leakage @ Vr:: 25 µA @ 40 V

Capacitance @ Vr, F:: 20pF @ 0V, 1MHz

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: DO-35

Operating Temperature - Junction:: -65°C ~ 125°C

BAT48 FAQ

1.How can I place an order for BAT48 through Aetrix?

Please submit a Request for Quotation (RFQ) for BAT48 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 BAT48 reliable?

The price and inventory of BAT48 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BAT48 is usually 5 days.

3.What payment methods are accepted for BAT48?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BAT48 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BAT48?

BAT48 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BAT48 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 BAT48?

For technical support, including BAT48 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BAT48 requirements.

6.How does Aetrix verify that BAT48 is sourced from the original manufacturer or authorized distributors?

All BAT48 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 BAT48 meets industry standards.

7.What is the process for return or replacement of BAT48?

All BAT48 units undergo pre-shipment inspection (PSI). If there is an issue with BAT48, 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 BAT48 part is unused and in its original packaging.

Return procedure for BAT48:

1.Submit a request within 90 days.

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

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