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Diodes Incorporated DSS2540M-7B
- Part No.:
- DSS2540M-7B
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- 3-UFDFN
- Datasheet:
-
DSS2540M-7B.pdf
- Description:
- TRANS NPN 40V 0.5A X1-DFN1006-3
- Quantity:
- Payment:
- Shipping:
Inventory:177,114
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Product details
Overview
DSS2540M-7B from Diodes Incorporated is a 40V NPN low-saturation transistor in X1-DFN1006-3 package, designed for high-efficiency switching in space-constrained DC-DC converters and load switches. It delivers 500mA continuous collector current, 1A peak pulse current, and ultra-low VCE(sat) of 250mV at IC = 500mA/IB = 50mA, enabling reduced conduction loss in battery-powered IoT sensors and LED drivers.
For engineers reviewing the DSS2540M-7B datasheet, DSS2540M-7B pinout, DSS2540M-7B application, or DSS2540M-7B equivalent, key selection criteria include its 0.60mm² footprint (13× smaller than SOT-23), 0.5mm height, JEDEC-qualified reliability, and complementary pairing with DSS3540M for push-pull topologies.
Technical Context
This NPN transistor operates with VCEO = 40V and VEBO = 6V, supporting robust operation in 24V industrial control rails and automotive body electronics. Its hFE ranges from 200 (IC = 10mA) to 50 (IC = 500mA), enabling stable gain across wide load conditions.
The device features a thermally optimized X1-DFN1006-3 package with exposed collector pad, achieving RθJA = 120°C/W when mounted on 25mm × 25mm 2oz copper-critical for sustained 400mW–1000mW power dissipation in compact PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 40V - Supports 24V nominal systems with 66% headroom against transients |
| IC (continuous) | 500mA - Enables direct drive of medium-power solenoids or logic-level MOSFET gates |
| VCE(sat) @ 500mA | 250mV - Reduces conduction loss to ≤125mW, minimizing thermal rise in sealed enclosures |
| fT | 250MHz - Sufficient for PWM switching up to ~50MHz in Class-D audio or fast-load transient response |
| RθJA (2oz Cu) | 120°C/W - Allows 1W dissipation with ≤120°C junction rise above ambient on standard FR4 |
| ESD HBM | 4000V - Meets IEC 61000-4-2 Level 3 for handling in non-ESD-controlled assembly lines |
Pinout & Package
Package: X1-DFN1006-3 - 1.0mm × 0.6mm, 0.5mm height, exposed collector pad for thermal relief; NiPdAu-plated terminals, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Collector (exposed pad) | Main current path output | Thermally coupled to PCB copper pour; must be soldered to ≥25mm² 2oz Cu for rated 1000mW dissipation |
| Emitter | Current return node | Connected to ground or low-side reference; forms low-impedance path with VCE(sat) < 250mV |
| Base | Control input | Requires 50mA drive for full saturation at 500mA; VBE(sat) = 1.2V ensures TTL/CMOS compatibility with series resistor |
Key Features
| Feature | Design Value |
|---|---|
| 0.60mm² footprint | Reduces board area by 92% vs. SOT-23, enabling dense integration in wearable and sensor modules |
| Low VCE(sat) at high IC | 250mV @ 500mA enables >98% efficiency in 3.3V/5V load-switch applications |
| JEDEC-qualified reliability | Qualified to AEC-Q101 stress standards, supporting industrial temperature range (−55°C to +150°C) |
| Complementary pair availability | DSS3540M (PNP) shares identical package and saturation specs for balanced push-pull designs |
Applications
| Smart Sensor Node Power Switching | Automotive Interior Lighting Control |
|---|---|
Use Scenario: Enabling/disabling MEMS sensor bias rails in ultra-low-power IoT nodes during sleep/wake cycles. IC Role / Device Role / Timing Role: Low-side switch controlling 3.3V analog supply to accelerometer/gyro ICs. Use Value: 250mV VCE(sat) limits dropout to <0.1% of rail voltage, preserving ADC reference accuracy and extending battery life. |
Use Scenario: Driving white LED strings (12V, 200mA) in door courtesy lighting with PWM dimming. IC Role / Device Role / Timing Role: Constant-current switch modulated at 1kHz to avoid audible noise. Use Value: 500mA IC rating and 250mV saturation ensure <50mW conduction loss per channel, eliminating heatsinking. |
| Industrial PLC Digital Output Module | USB-C Port Power Path Management |
Use Scenario: Isolated 24V DC output stage driving solenoid valves in factory automation controllers. IC Role / Device Role / Timing Role: High-side switch (with external level shift) delivering 500mA pulses to 24V/2W loads. Use Value: 40V VCEO withstands 40V flyback spikes from inductive loads without snubber circuitry. |
Use Scenario: Load switch for VBUS path control in USB-C PD sink applications requiring 5V/3A capability. IC Role / Device Role / Timing Role: Secondary switch enabling/disabling downstream 5V rail after CC logic negotiation. Use Value: 0.5mm profile allows placement under USB-C connector, and 120°C/W RθJA supports 1W dissipation in thermally constrained layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN low-saturation transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DSS2540M-7 | Same die, 3,000-unit reel vs. 10,000-unit reel; identical electrical specs and thermal performance | No functional difference; selected for lower-volume prototyping or qualification builds | Choose -7 for evaluation or small-batch production where tape-and-reel quantity flexibility is needed |
| DMT3006LPSQ-7 | 60V VCEO, 3A IC, SO-8 package; higher voltage/current but 3× larger footprint and 1.1mm height | Suitable for 48V industrial systems requiring higher surge margin; not drop-in due to package and pinout mismatch | Select only when 40V rating is insufficient and board space permits SO-8 layout |
Compared with DSS2540M-7B, the -7 variant offers identical performance in smaller reels for design validation, while DMT3006LPSQ-7 trades miniaturization for higher voltage headroom and current capacity-making it appropriate only when the X1-DFN1006-3 footprint constraint is relaxed.
Availability
DSS2540M-7B is available at Aetrix Electronics and suitable for smart sensor nodes, automotive interior lighting, and industrial PLC digital output modules requiring stable component supply with guaranteed long-term continuity.
Supply support for DSS2540M-7B 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 distribution operations across Asia, Europe, and the Americas.
The DSS2540M belongs to Diodes' low-saturation bipolar transistor product line, engineered specifically for high-efficiency, space-constrained switching in battery-powered and thermally limited applications.
FAQ
What is the maximum allowable junction temperature for DSS2540M-7B?
The device is rated for TJ from −55°C to +150°C. At maximum ambient temperature (+85°C) and 500mA continuous current, thermal design using the 120°C/W RθJA (2oz Cu) yields a junction rise of 60°C, resulting in TJ = 145°C-within specification and leaving 5°C safety margin.
Can DSS2540M-7B replace a standard SOT-23 NPN transistor in an existing design?
Yes, but only with PCB layout revision: the X1-DFN1006-3 footprint (1.0mm × 0.6mm) is incompatible with SOT-23 pads. The exposed collector pad requires dedicated thermal copper pour, and pinout (C-E-B) differs from SOT-23's E-B-C. Electrical substitution is valid if VCEO, IC, and VCE(sat) meet requirements.
Is DSS2540M-7B qualified for automotive applications?
The base part is AEC-Q101 qualified per Diodes' documentation, but DSS2540M-7B itself is not an automotive-grade (Q-suffix) part. For PPAP-capable, IATF 16949-manufactured automotive use, select DSS2540QM-7B (Q-suffix variant) listed in Diodes' automotive product portal.
What is the recommended PCB pad layout for optimal thermal performance?
Per Diodes' package outline DS31820 Rev. 5-2, the exposed collector pad must connect to ≥25mm² of 2oz copper for 1000mW operation. Minimum recommended pad dimensions are 1.0mm × 0.6mm with 0.35mm pitch; thermal vias (≥4× 0.3mm diameter) beneath the pad are strongly advised to enhance vertical heat transfer to inner layers.
DSS2540M-7B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 3-UFDFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Transistor Type:
- NPN
- Current - Collector (Ic) (Max):
- 500 mA
- Voltage - Collector Emitter Breakdown (Max):
- 40 V
- Vce Saturation (Max) @ Ib, Ic:
- 250mV @ 50mA, 500mA
- Current - Collector Cutoff (Max):
- 100nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 150 @ 100mA, 2V
- Power - Max:
- 250 mW
- Frequency - Transition:
- 300MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- X1-DFN1006-3
DSS2540M-7B FAQ
1.How can I place an order for DSS2540M-7B through Aetrix?
Please submit a Request for Quotation (RFQ) for DSS2540M-7B 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 DSS2540M-7B reliable?
The price and inventory of DSS2540M-7B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DSS2540M-7B is usually 5 days.
3.What payment methods are accepted for DSS2540M-7B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DSS2540M-7B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DSS2540M-7B?
DSS2540M-7B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DSS2540M-7B 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 DSS2540M-7B?
For technical support, including DSS2540M-7B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DSS2540M-7B requirements.
6.How does Aetrix verify that DSS2540M-7B is sourced from the original manufacturer or authorized distributors?
All DSS2540M-7B 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 DSS2540M-7B meets industry standards.
7.What is the process for return or replacement of DSS2540M-7B?
All DSS2540M-7B units undergo pre-shipment inspection (PSI). If there is an issue with DSS2540M-7B, 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 DSS2540M-7B part is unused and in its original packaging.
Return procedure for DSS2540M-7B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
DSS2540M-7B Tags
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Diodes Incorporated
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Diodes Incorporated
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