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

STMicroelectronics BAT48ZFILM

Name: BAT48ZFILM
Brand: STMicroelectronics
SKU: BAT48ZFILM
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BAT48ZFILM

Manufacturer:: STMicroelectronics

Category:: Single Diodes

Package:: SOD-123

Datasheet:: BAT48ZFILM.pdf

Description:: DIODE SCHOTTKY 40V 350MA SOD123

Quantity:: RFQ Add To RFQ list

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Inventory:35,112

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Product details

Overview

BAT48ZFILM from STMicroelectronics is a 40 V, 350 mA surface-mount Schottky barrier diode in SOD-123 package, featuring low forward voltage (0.4 V at 10 mA), ultra-low reverse leakage (1 µA at 1.5 V), and fast switching with 18 pF capacitance at 1 V - optimized for high-frequency rectification in power management and signal clamping circuits.

For engineers reviewing the BAT48ZFILM datasheet, BAT48ZFILM pinout, BAT48ZFILM application, or BAT48ZFILM equivalent, key selection criteria include forward voltage drop at low currents, junction temperature derating behavior, reverse recovery performance, and thermal resistance under PCB pad layout constraints.

Technical Context

The BAT48ZFILM implements a planar Schottky barrier structure with metal–semiconductor junction, enabling negligible minority-carrier storage and sub-nanosecond reverse recovery. Its low V_F (0.25 V at 0.1 mA) supports efficient operation in low-voltage bias networks and RF detector circuits.

Thermal design relies on its R_th(j-a) of 500 °C/W on epoxy FR4 with recommended pad layout, and maximum junction temperature of +150 °C - validated for continuous operation in ambient temperatures up to +125 °C with appropriate current derating.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	40 V - supports reverse blocking in 24 V and 36 V DC systems without breakdown risk
I_F	350 mA continuous - suitable for low-power supply rail clamping and signal path protection
V_F @ 10 mA	0.4 V typical - minimizes conduction loss in battery-powered sensor nodes
I_R @ 1.5 V	1 µA max at 25 °C - ensures minimal leakage in high-impedance bias networks
C_j @ 1 V	18 pF - enables use in UHF detector and RF sampling applications up to ~500 MHz
T_j(max)	+150 °C - allows operation in automotive under-hood environments with proper PCB copper area
R_th(j-a)	500 °C/W - requires ≥2.25 mm² copper per lead on FR4 for full-rated current handling

Pinout & Package

SOD-123 package: surface-mount, single-diode configuration with cathode band marking; 2.70 mm × 1.60 mm footprint, 1.2 mm height, JEDEC-compliant lead-free termination.

Pin/Terminal	Circuit Role	Design Meaning
Anode (A)	Forward current entry point	Connected to higher-potential node in clamping or rectification paths
Cathode (K)	Forward current exit / reverse-blocking terminal	Marked by band; ties to reference or ground-side node for unidirectional conduction

Key Features

Feature	Design Value
Low forward voltage at microamp bias	0.25 V at 0.1 mA - enables precision voltage reference clamping in analog front-ends
Negligible switching losses	No minority-carrier storage - eliminates tail current in PWM-driven flyback snubbers
Extremely fast switching	Sub-ns reverse recovery - preserves signal integrity in 100+ MHz RF envelope detectors
Low capacitance	18 pF at 1 V reverse bias - maintains bandwidth in high-speed logic-level translation
High-temperature operation	Rated to +150 °C junction - supports deployment in sealed industrial enclosures without forced cooling

Applications

Power Rail Clamp

RF Signal Detector

Use Scenario: Protecting 3.3 V I/O pins against ESD-induced overvoltage transients in portable instrumentation.

IC Role / Device Role: Low-capacitance clamping diode shunting transient energy to ground.

Use Value: 18 pF capacitance avoids signal distortion; 0.4 V forward drop ensures clamping threshold stays below 3.6 V.

Use Scenario: Demodulating AM signals in 433 MHz ISM-band wireless receivers.

IC Role / Device Role: Zero-bias Schottky detector diode converting RF envelope to baseband voltage.

Use Value: 0.25 V turn-on enables detection of sub-10 mV RF inputs; low leakage preserves DC output accuracy.

Low-Voltage Rectifier

Logic-Level Translator

Use Scenario: Generating bias voltage from 5 V USB supply for low-noise op-amp rails in audio preamps.

IC Role / Device Role: Half-wave rectifier feeding RC filter to produce clean 4.6 V DC.

Use Value: 0.4 V forward drop maximizes output voltage; 350 mA rating supports 200 mA load with margin.

Use Scenario: Level-shifting 1.8 V GPIO signals to 3.3 V domain in mixed-voltage MCU interfaces.

IC Role / Device Role: Passive bidirectional translator using Schottky forward conduction.

Use Value: 0.25 V offset enables reliable 1.8 V → 3.3 V translation without active circuitry.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SBAT54LT1G	30 V V_RRM, 200 mA I_F, 10 pF C_j at 1 V	Lower voltage rating limits use in 24 V systems; lower capacitance benefits >1 GHz RF apps	Select when operating below 30 V and requiring tighter RF bandwidth control
1N5711	70 V V_RRM, 150 mA I_F, DO-35 through-hole, 4 pF C_j	Higher voltage tolerance but larger package and lower current rating; not SMT-compatible	Choose for prototyping or legacy through-hole designs needing higher reverse margin

Compared with SBAT54LT1G and 1N5711, BAT48ZFILM offers the optimal balance of 40 V blocking, 350 mA current capability, and 18 pF capacitance in a compact SOD-123 package - making it preferred for production-grade SMT power and RF signal conditioning where space and thermal performance are constrained.

Availability

BAT48ZFILM is available at Aetrix Electronics and suitable for power rail clamp, RF signal detector, low-voltage rectifier, and logic-level translator applications requiring stable component supply across industrial, medical, and consumer electronics programs.

Supply support for BAT48ZFILM 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, designing and manufacturing analog, digital, and mixed-signal ICs for automotive, industrial, and consumer markets.

The BAT48 series belongs to ST's general-purpose discrete portfolio, engineered specifically for high-efficiency, high-speed switching in space-constrained SMT power management and RF interface circuits.

FAQ

What is the maximum reverse voltage the BAT48ZFILM can withstand continuously?

The BAT48ZFILM has a repetitive peak reverse voltage (V_RRM) rating of 40 V. This is the maximum DC or sinusoidal AC reverse voltage that may be continuously applied without risking junction breakdown, verified per ST's absolute ratings table at T_j = 25 °C. Derating applies above 25 °C ambient per Figure 2.

Does BAT48ZFILM have a specified reverse recovery time (t_rr)?

ST does not specify t_rr as a discrete parameter for BAT48ZFILM because its Schottky construction yields negligible minority-carrier storage. Instead, the datasheet emphasizes "extremely fast switching" and "negligible switching losses", confirmed by sub-nanosecond effective recovery in dynamic test conditions (pulse width < 380 µs).

Can BAT48ZFILM be used in zero-bias RF detector applications?

Yes - its 0.25 V forward voltage at 0.1 mA and 18 pF junction capacitance at 1 V make it suitable for zero-bias AM demodulation in UHF bands. Performance is validated in typical curves (Figure 6) showing usable conduction down to microamp currents, with leakage remaining below 10 µA up to 60 °C junction temperature.

What is the recommended PCB pad layout for thermal performance?

ST specifies an epoxy FR4 board with recommended pad layout achieving R_th(j-a) = 500 °C/W. The layout requires 2.25 mm² copper area per lead (per Figure 8), minimum 35 µm copper thickness, and no thermal relief - critical to sustain 350 mA continuous current at ambient temperatures up to +125 °C.

BAT48ZFILM Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: SOD-123

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:: 30pF @ 0V, 1MHz

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOD-123

Operating Temperature - Junction:: -40°C ~ 150°C

BAT48ZFILM FAQ

1.How can I place an order for BAT48ZFILM through Aetrix?

Please submit a Request for Quotation (RFQ) for BAT48ZFILM 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 BAT48ZFILM reliable?

The price and inventory of BAT48ZFILM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BAT48ZFILM is usually 5 days.

3.What payment methods are accepted for BAT48ZFILM?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BAT48ZFILM transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BAT48ZFILM?

BAT48ZFILM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BAT48ZFILM 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 BAT48ZFILM?

For technical support, including BAT48ZFILM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BAT48ZFILM requirements.

6.How does Aetrix verify that BAT48ZFILM is sourced from the original manufacturer or authorized distributors?

All BAT48ZFILM 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 BAT48ZFILM meets industry standards.

7.What is the process for return or replacement of BAT48ZFILM?

All BAT48ZFILM units undergo pre-shipment inspection (PSI). If there is an issue with BAT48ZFILM, 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 BAT48ZFILM part is unused and in its original packaging.

Return procedure for BAT48ZFILM:

1.Submit a request within 90 days.

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

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