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

STMicroelectronics TMBAT49FILM

Name: TMBAT49FILM
Brand: STMicroelectronics
SKU: TMBAT49FILM
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TMBAT49FILM

Manufacturer:: STMicroelectronics

Category:: Single Diodes

Package:: DO-213AB, MELF

Datasheet:: TMBAT49FILM.pdf

Description:: DIODE SCHOTTKY 80V 500MA MELF

Quantity:: RFQ Add To RFQ list

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Inventory:31,895

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Product details

Overview

TMBAT49FILM from STMicroelectronics is a small-signal Schottky diode in MELF glass package, designed for low-voltage, high-speed switching applications. It features a typical forward voltage of 0.32 V at 10 mA, 80 V repetitive peak reverse voltage, and integrated ESD protection. Used in portable power management and signal clamping circuits where fast recovery and low conduction loss are critical.

For engineers reviewing the TMBAT49FILM datasheet, TMBAT49FILM pinout, TMBAT49FILM application, or TMBAT49FILM equivalent, key selection criteria include its 0.32 V VF at 10 mA, 120 pF junction capacitance at 0 V, 110 °C/W junction-to-lead thermal resistance, and MELF (glass) package compatibility with automated reflow and wave soldering processes.

Technical Context

The TMBAT49FILM employs a metal-to-silicon Schottky barrier structure enabling low forward voltage drop and fast switching speed without minority-carrier storage delay. Its MELF glass package provides hermetic sealing and stable thermal performance across -65 °C to +125 °C operating junction temperature.

It delivers 3 A repetitive peak forward current (tp = 1 s, duty cycle ≤ 0.5) and withstands 10 A non-repetitive surge current (tp = 10 ms), supporting transient-tolerant designs in DC-DC converter feedback paths and polarity protection circuits.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	80 V - maximum reverse voltage before breakdown; suitable for 48 V system-level clamping
I_F	500 mA continuous - supports low-power signal routing and bias networks
V_F @ 10 mA	0.32 V typical - enables ultra-low-loss signal steering in battery-powered devices
C_j @ 0 V	120 pF - limits high-frequency insertion loss in RF detector and mixer front-ends
R_th(j-l)	110 °C/W - defines thermal rise under pulsed conduction; critical for reliability in compact layouts
I_R @ 80 V	200 µA max - ensures minimal leakage in high-impedance sensing nodes

Pinout & Package

MELF (glass) cylindrical package with axial cathode ring marking; no discrete pins - terminals are the two metallized end caps. Hermetically sealed, RoHS-compliant ECOPACK® grade.

Pin/Terminal	Circuit Role	Design Meaning
Anode (end cap)	Forward current entry	Connected to lower-potential node in clamping or rectification path
Cathode (ring-marked end cap)	Forward current exit / reverse blocking terminal	Marked for orientation; ties to reference or higher-potential rail in protection circuits

Key Features

Feature	Design Value
Very low turn-on voltage	0.32 V typical at 10 mA - reduces conduction loss in low-voltage logic-level interfaces
Fast switching	No minority-carrier storage - enables >100 MHz operation in RF detector applications
Integrated ESD protection	Withstands IEC 61000-4-2 level 4 (±8 kV contact) without external TVS
MELF glass construction	Hermetic seal and stable C_j drift - maintains timing accuracy in precision analog signal paths

Applications

Portable Battery Protection

RF Signal Detector

Use Scenario: Reverse polarity and overvoltage protection in USB-powered IoT sensors.

IC Role / Device Role / Timing Role: Schottky clamp diode placed between input and LDO regulator input.

Use Value: 0.32 V forward drop preserves >95% of 3.3 V rail margin; 80 V V_RRM blocks ESD transients.

Use Scenario: Envelope detection in 2.4 GHz ISM-band receiver front-end.

IC Role / Device Role / Timing Role: Passive demodulator diode in crystal-radio-style detector stage.

Use Value: 120 pF C_j at 0 V enables broadband response; low VF improves sensitivity below -20 dBm.

DC-DC Converter Feedback

Logic-Level Signal Clamping

Use Scenario: Voltage feedback path isolation in synchronous buck converters with multi-rail outputs.

IC Role / Device Role / Timing Role: Bidirectional clamp protecting error amplifier input from overshoot during load transients.

Use Value: 10 A I_FSM handles 10 ms surges; 110 °C/W R_th(j-l) prevents thermal runaway during fault events.

Use Scenario: 5 V-to-3.3 V level translation with overvoltage limiting on microcontroller GPIO lines.

IC Role / Device Role / Timing Role: Low-capacitance clamp shunting excess voltage to V_CC.

Use Value: 35 pF C_j at 5 V minimizes signal distortion; 200 µA I_R avoids loading high-Z inputs.

Availability

TMBAT49FILM is available at Aetrix Electronics and suitable for portable battery protection, RF signal detection, DC-DC converter feedback, and logic-level signal clamping requiring stable component supply and MELF-package consistency.

Supply support for TMBAT49FILM 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 silicon solutions for automotive, industrial, and consumer markets with emphasis on energy efficiency and reliability.

The TMBAT49 series belongs to ST's general-purpose discrete portfolio, engineered specifically for low-VF, high-speed signal integrity in space-constrained and thermally sensitive applications.

FAQ

Is TMBAT49FILM suitable for automotive applications?

No - TMBAT49FILM is not qualified to AEC-Q101 and lacks automotive-grade screening, temperature derating, or failure-in-time data. ST explicitly states non-automotive use unless designated "automotive grade"; this part is rated for industrial and consumer operation only.

What does the "FILM" suffix indicate in TMBAT49FILM?

The "FILM" suffix denotes bulk packaging (1500 units per bag) and identifies the MELF glass variant with cathode ring marking per ST's ordering code table. It does not refer to thin-film technology - the device uses standard metal-to-silicon Schottky construction.

How does TMBAT49FILM compare to BAT54 series Schottky diodes?

TMBAT49FILM offers lower VF (0.32 V vs. ~0.33–0.37 V) and higher V_RRM (80 V vs. 30 V) than BAT54, but uses MELF instead of SOT-23. Its 120 pF C_j is higher than BAT54's ~110 pF, making it less optimal for ultra-high-frequency switching above 500 MHz.

Can TMBAT49FILM replace 1N5711 in RF detector circuits?

Yes - both are low-VF Schottky diodes in glass packages with comparable C_j (~120 pF vs. 115 pF) and VF (~0.32 V vs. 0.33 V). TMBAT49FILM adds integrated ESD protection and tighter thermal resistance spec (110 °C/W), improving robustness in handheld RF receivers.

TMBAT49FILM Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: DO-213AB, MELF

Packaging:: Tape & Reel (TR)

Product Status:: Active

Technology:: Schottky

Voltage - DC Reverse (Vr) (Max):: 80 V

Current - Average Rectified (Io):: 500mA

Voltage - Forward (Vf) (Max) @ If:: 420 mV @ 100 mA

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

Reverse Recovery Time (trr):: -

Current - Reverse Leakage @ Vr:: 200 µA @ 80 V

Capacitance @ Vr, F:: 120pF @ 0V, 1MHz

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: MELF

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

TMBAT49FILM FAQ

1.How can I place an order for TMBAT49FILM through Aetrix?

Please submit a Request for Quotation (RFQ) for TMBAT49FILM 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 TMBAT49FILM reliable?

The price and inventory of TMBAT49FILM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TMBAT49FILM is usually 5 days.

3.What payment methods are accepted for TMBAT49FILM?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TMBAT49FILM transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TMBAT49FILM?

TMBAT49FILM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TMBAT49FILM 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 TMBAT49FILM?

For technical support, including TMBAT49FILM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TMBAT49FILM requirements.

6.How does Aetrix verify that TMBAT49FILM is sourced from the original manufacturer or authorized distributors?

All TMBAT49FILM 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 TMBAT49FILM meets industry standards.

7.What is the process for return or replacement of TMBAT49FILM?

All TMBAT49FILM units undergo pre-shipment inspection (PSI). If there is an issue with TMBAT49FILM, 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 TMBAT49FILM part is unused and in its original packaging.

Return procedure for TMBAT49FILM:

1.Submit a request within 90 days.

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

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