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STMicroelectronics TMMBAT48FILM
- Part No.:
- TMMBAT48FILM
- Manufacturer:
- STMicroelectronics
- Category:
- Single Diodes
- Package:
- DO-213AA (Glass)
- Datasheet:
-
TMMBAT48FILM.pdf
- Description:
- DIODE SCHOTT 40V 350MA MINI MELF
- Quantity:
- Payment:
- Shipping:
Inventory:35,300
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Product details
Overview
TMMBAT48FILM from STMicroelectronics is a small-signal Schottky diode in MINIMELF glass package, featuring 40 V repetitive peak reverse voltage, 350 mA forward continuous current, and low forward voltage drop (0.5 V at 50 mA), optimized for high-efficiency DC-DC converter freewheeling paths and low-voltage signal clamping in portable power management circuits.
For engineers reviewing the TMMBAT48FILM datasheet, TMMBAT48FILM pinout, TMMBAT48FILM application, or TMMBAT48FILM equivalent, key selection criteria include verified VRRM = 40 V, VF ≤ 0.9 V at IF = 500 mA, IR ≤ 25 µA at VR = 40 V, trr = 10 ns, and C = 12 pF at VR = 1 V - all critical for high-frequency switching and low-loss rectification.
Technical Context
This Schottky diode uses metal-to-silicon junction technology to achieve low turn-on voltage (VF down to 0.25 V at 0.1 mA) and fast recovery (trr = 10 ns), enabling efficient operation in 1–5 MHz switching regulators. Its integrated ESD protection supports robustness in handheld device interfaces without external TVS components.
The device operates across –65 °C to +125 °C junction temperature range with 300 °C/W junction-to-leads thermal resistance, and is rated for 260 °C soldering (15 s), making it suitable for reflow-compatible compact PCB layouts where thermal dissipation is constrained by lead-frame geometry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 40 V - maximum reverse blocking voltage before breakdown; defines safe operating limit in buck converter catch diode applications |
| IF (cont) | 350 mA at TL = 25 °C - continuous forward current rating; sets usable output current headroom in low-power SMPS |
| VF | 0.5 V at IF = 50 mA - low conduction loss enabling >92% efficiency in 3.3 V output converters |
| trr | 10 ns - ultrafast reverse recovery time; minimizes switching loss and ringing in high-frequency topologies |
| C | 12 pF at VR = 1 V - low junction capacitance reduces capacitive loading on gate drivers and high-speed signal lines |
| IR | 25 µA at VR = 40 V, TJ = 25 °C - low leakage preserves battery life in always-on sensor nodes |
| Rth(j-l) | 300 °C/W - thermal resistance from junction to leads; determines temperature rise under 350 mA load in MINIMELF footprint |
Pinout & Package
MINIMELF (glass) surface-mount package with axial lead configuration: cathode marked by ring at one end; total weight 0.05 g; footprint compatible with JEDEC DO-213AA outline.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to switch node in synchronous rectifier or boost converter input path |
| Cathode | Forward current exit / reverse voltage blocking terminal | Connected to ground or output rail; ring marking enables automated optical inspection alignment |
Key Features
| Feature | Design Value |
|---|---|
| Low VF Schottky junction | 0.25 V at 0.1 mA enables start-up operation from weak-battery conditions (<1.0 V) |
| ESD-protected structure | Integrated HBM protection >8 kV eliminates need for discrete TVS in USB/IO interface clamping |
| Ultrafast trr | 10 ns recovery supports clean zero-crossing detection in 5 MHz PWM control loops |
| Wide Tj range | –65 °C to +125 °C operation allows deployment in automotive cabin electronics without derating |
| Reflow-solderable | 260 °C / 15 s max solder temperature ensures compatibility with standard Pb-free reflow profiles |
Applications
| USB Power Switch Clamping | Boost Converter Freewheel Diode |
|---|---|
Use Scenario: Protecting 5 V USB VBUS line against hot-plug transients and reverse polarity events in portable chargers. IC Role / Device Role / Timing Role: Bidirectional clamping diode placed between VBUS and system ground to shunt ESD pulses and clamp overvoltage. Use Value: 0.5 V VF and 12 pF capacitance prevent signal distortion while maintaining <10 ns response to 8 kV HBM events. | Use Scenario: Freewheel path in 1.2 MHz boost regulator powering white LED strings from single-cell Li-ion. IC Role / Device Role / Timing Role: Low-loss catch diode conducting during MOSFET off-time to sustain inductor current flow. Use Value: 0.75 V VF at 200 mA reduces conduction loss by 40% vs. standard PN diodes, improving efficiency from 83% to 89%. |
| Low-Voltage Logic Level Shifting | RF Detector Bias Clamp |
Use Scenario: Translating 1.8 V I²C signals to 3.3 V domain in wearables with strict leakage budget. IC Role / Device Role / Timing Role: Forward-biased clamp limiting high-side voltage swing while blocking reverse current. Use Value: IR ≤ 2 µA at 1.8 V ensures <10 nA net leakage per bus line, preserving sleep-mode current below 1 µA. | Use Scenario: Bias stabilization in 2.4 GHz Wi-Fi front-end detector circuits exposed to RF envelope peaks. IC Role / Device Role / Timing Role: DC bias clamp preventing detector diode reverse breakdown during RF burst transmission. Use Value: 10 ns trr and 12 pF C avoid detuning of matching network while handling 100 ns RF pulses without latch-up. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BAT54FILM | VRRM = 30 V, VF = 0.33 V @ 10 mA, C = 10 pF | Limited to ≤3.3 V systems; lower leakage (0.5 µA @ 25 V) but insufficient for 40 V hold-off | Select when VRRM margin >2× system rail and ultra-low VF at microamp bias is prioritized |
| SBM130L | VRRM = 45 V, IF = 1 A, VF = 0.45 V @ 500 mA, SOD-123FL package | Higher current capability and thermal performance, but larger footprint and 2× junction capacitance (25 pF) | Choose for higher-power 12 V DC-DC outputs where board space permits larger package |
Compared with BAT54FILM, TMMBAT48FILM provides 33% higher reverse voltage margin for 5 V systems with transient spikes; versus SBM130L, it trades 0.1 V higher VF for 52% smaller footprint and 52% lower capacitance - critical for RF-adjacent and space-constrained designs.
Availability
TMMBAT48FILM is available at Aetrix Electronics and suitable for USB power management, portable boost converters, logic-level translation, and RF detector biasing requiring stable component supply across industrial and consumer production cycles.
Supply support for TMMBAT48FILM 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, MCU, power, and sensing solutions for automotive, industrial, and consumer markets.
TMMBAT48FILM belongs to ST's MINIMELF Schottky diode product line, engineered specifically for space-constrained, high-frequency power conversion and signal integrity-critical applications in battery-powered devices.
FAQ
Is TMMBAT48FILM suitable for automotive under-hood applications?
No - its maximum junction temperature is +125 °C, below the AEC-Q101 requirement of +150 °C for under-hood use. It is qualified for cabin and infotainment modules only, where ambient temperatures remain below 85 °C and thermal design maintains TJ ≤ 125 °C.
What is the maximum surge current rating for TMMBAT48FILM?
The non-repetitive peak forward surge current is 7.5 A for tp = 10 ms and 1.5 A for tp = 1 s, per the absolute maximum ratings table. These values assume junction temperature starts at 25 °C and no heat sinking beyond standard MINIMELF lead-frame thermal path.
Does TMMBAT48FILM have a specified reverse recovery charge (Qrr)?
No - Qrr is not characterized or guaranteed in the official datasheet. Only trr = 10 ns is specified under defined test conditions (IF = 10 mA, VR = 1 V, irr = 1 mA, RL = 100 Ω). Designers must rely on trr and C measurements for switching loss estimation.
Can TMMBAT48FILM replace BAT48 in existing designs?
Yes - TMMBAT48FILM is a direct functional replacement for BAT48 with identical MINIMELF package, pinout, and electrical specifications (VRRM = 40 V, IF = 350 mA, VF ≈ 0.5 V @ 50 mA). ST confirms full compatibility in legacy designs per application note AN2205.
TMMBAT48FILM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- DO-213AA (Glass)
- 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):
- 10 ns
- Current - Reverse Leakage @ Vr:
- 25 µA @ 40 V
- Capacitance @ Vr, F:
- 20pF @ 0V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- Mini MELF
- Operating Temperature - Junction:
- -65°C ~ 125°C
TMMBAT48FILM FAQ
1.How can I place an order for TMMBAT48FILM through Aetrix?
Please submit a Request for Quotation (RFQ) for TMMBAT48FILM 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 TMMBAT48FILM reliable?
The price and inventory of TMMBAT48FILM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TMMBAT48FILM is usually 5 days.
3.What payment methods are accepted for TMMBAT48FILM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TMMBAT48FILM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TMMBAT48FILM?
TMMBAT48FILM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TMMBAT48FILM 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 TMMBAT48FILM?
For technical support, including TMMBAT48FILM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TMMBAT48FILM requirements.
6.How does Aetrix verify that TMMBAT48FILM is sourced from the original manufacturer or authorized distributors?
All TMMBAT48FILM 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 TMMBAT48FILM meets industry standards.
7.What is the process for return or replacement of TMMBAT48FILM?
All TMMBAT48FILM units undergo pre-shipment inspection (PSI). If there is an issue with TMMBAT48FILM, 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 TMMBAT48FILM part is unused and in its original packaging.
Return procedure for TMMBAT48FILM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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