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Diodes Incorporated DSS3540M-7B
- Part No.:
- DSS3540M-7B
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- 3-UFDFN
- Datasheet:
-
DSS3540M-7B.pdf
- Description:
- TRANS PNP 40V 0.5A X1-DFN1006-3
- Quantity:
- Payment:
- Shipping:
Inventory:29,390
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Product details
Overview
DSS3540M-7B from Diodes Incorporated is a 40V PNP 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, -40V VCEO, and ultra-low VCE(sat) of -130mV at -100mA/-5mA, enabling minimal conduction loss in automotive body control modules and industrial sensor interfaces.
For engineers reviewing the DSS3540M-7B datasheet, DSS3540M-7B pinout, DSS3540M-7B application, or DSS3540M-7B equivalent, this page provides verified electrical parameters, thermal performance data, JEDEC-qualified reliability status, and direct comparison with complementary NPN DSS2540M and automotive-grade DSS3540MQ.
Technical Context
This PNP bipolar junction transistor operates with fixed-base drive logic in low-side switch configurations, supporting pulsed IC up to -1A and maintaining stable hFE ≥ 150 at -100mA. Its RθJA of 120°C/W (with 25mm² copper pad) enables operation up to +150°C junction temperature under sustained 400mW dissipation.
The device features NiPdAu-plated terminals compatible with lead-free reflow, JEDEC Class 3A HBM ESD rating (4kV), and halogen/antimony-free "Green" molding compound compliant with RoHS 3. The exposed collector pad serves as both thermal path and primary current terminal.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | -40V - supports 36V automotive battery rail with 10% margin against transients |
| IC (continuous) | -500mA - drives medium-power solenoids, LED strings, or fan motors without heatsinking |
| VCE(sat) | -130mV @ -100mA/-5mA - reduces power loss to ≤13mW in always-on bias circuits |
| fT | 100MHz - sufficient for PWM switching up to 10MHz in Class-D audio or SMPS feedback paths |
| RθJA | 120°C/W (with 25mm² Cu) - allows 400mW continuous dissipation at +85°C ambient |
| ESD HBM | 4,000V - meets IEC 61000-4-2 Level 4 for board-level surge immunity |
| Package footprint | 0.6mm × 1.0mm - occupies 0.6mm² area, 13× smaller than SOT-23 for ultra-dense layouts |
Pinout & Package
Package: X1-DFN1006-3, 0.5mm height, molded plastic with exposed collector pad (Pin 1). Dimensions: 1.00mm × 0.60mm × 0.50mm (L × W × H), weight 0.0009g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Exposed Pad) | Collector | Primary current path and thermal interface; must be soldered to ≥25mm² copper for rated RθJA |
| Pin 2 | Base | Current-controlled input; requires -5mA drive for full saturation at -500mA load |
| Pin 3 | Emitter | Reference node for load connection; tied to system ground or higher potential in high-side config |
Key Features
| Feature | Design Value |
|---|---|
| Low VCE(sat) | -130mV at -100mA ensures <1% voltage drop across switch in 12V systems |
| JEDEC-qualified reliability | Qualified per AEC-Q standards for automotive-grade robustness without derating |
| Ultra-small footprint | 0.6mm² area enables placement beneath connectors or near BGA packages |
| Lead-free & Green | RoHS 3 compliant with <900ppm Br/Cl and <1000ppm Sb; UL 94V-0 flammability rating |
| High fT | 100MHz gain-bandwidth supports fast turn-off in PWM dimming and motor commutation |
Applications
| Automotive Body Control | Industrial Sensor Interface |
|---|---|
|
Use Scenario: Driving door lock actuators and interior lighting loads in 12V vehicle architectures. IC Role / Device Role / Timing Role: Low-side PNP switch controlled by microcontroller GPIO with active-low logic. Use Value: -40V VCEO withstands load-dump transients; -130mV VCE(sat) limits self-heating during 500ms pulse activation. |
Use Scenario: Isolating analog sensor outputs (e.g., pressure transducers) from shared supply rails. IC Role / Device Role / Timing Role: High-impedance emitter-follower buffer with rail-to-rail output swing. Use Value: hFE ≥ 150 at -100mA ensures stable biasing; 4kV HBM protects against ESD during field wiring. |
| DC-DC Converter Bias | Smartphone Power Management |
|
Use Scenario: Enabling synchronous rectifier gate drivers in buck converter auxiliary supplies. IC Role / Device Role / Timing Role: Fast-turnoff PNP switch controlling NMOS gate pull-down path. Use Value: 100MHz fT supports <100ns switching; 0.5mm height avoids interference with inductor height clearance. |
Use Scenario: Controlling backlight LED current in OLED display power trees. IC Role / Device Role / Timing Role: Constant-current sink with programmable base drive for brightness scaling. Use Value: RCE(sat) ≤ 700mΩ at -500mA enables precise current regulation with ±2% tolerance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DSS3540MQ | Automotive-qualified version with AEC-Q101 certification and extended -40°C to +150°C operating range | Required for under-hood ECUs; identical electrical specs but stricter PPAP documentation | Select for automotive production; not needed for industrial prototypes or consumer designs |
| DSS2540M | Complementary NPN device with +40V VCEO, +500mA IC, and +130mV VCE(sat) | Used in push-pull or H-bridge topologies where bidirectional current control is required | Choose when designing dual-polarity driver stages or level-shifting interfaces |
Compared with DSS3540MQ, the DSS3540M-7B offers identical switching performance at lower cost and qualification overhead; compared with DSS2540M, it provides inverted logic polarity and negative rail compatibility essential for high-side sensing and battery disconnect functions.
Availability
DSS3540M-7B is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor interfaces, DC-DC converter bias circuits, and smartphone power management requiring stable component supply with guaranteed long-term sourcing.
Supply support for DSS3540M-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, specializing in high-reliability power management, signal integrity, and protection solutions for automotive, industrial, and consumer markets.
The DSS3540M belongs to Diodes' low-saturation bipolar transistor product line, engineered for space-constrained switching applications demanding minimal conduction loss, JEDEC-qualified reliability, and ultra-small footprint in portable and automotive electronics.
FAQ
What is the maximum allowable junction temperature for DSS3540M-7B?
The absolute maximum junction temperature is +150°C, validated per JEDEC JESD22-A104. At 100% duty cycle and 400mW dissipation on a 25mm² 2oz copper pad, junction temperature rise is limited to 48°C above ambient, ensuring safe operation up to +102°C ambient.
Can DSS3540M-7B replace SOT-23 PNP transistors in existing designs?
Yes, with PCB layout revision: the X1-DFN1006-3 package requires updated land pattern per Diodes' recommended pad layout (0.40mm X, 0.70mm Y1, 0.25mm Y). Thermal performance improves significantly due to lower RθJA, but base drive current must be verified for -500mA saturation.
Is DSS3540M-7B suitable for linear regulator pass elements?
No - its VCE(sat) is optimized for switching, not linear operation. At IC = -500mA and VCE = -2V, power dissipation exceeds 1W, exceeding the 400mW continuous rating. Use only in saturated-switch or pulse applications.
Does DSS3540M-7B require external base resistors for microcontroller GPIO drive?
Yes - typical GPIO sources 20mA max. To achieve -50mA base current for -500mA collector saturation, a 100Ω series resistor is required when driving from 3.3V logic (VBE(sat) ≈ -1.2V), limiting base current to ~21mA; parallel GPIO pins or dedicated driver may be needed for full-rated current.
DSS3540M-7B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 3-UFDFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Transistor Type:
- PNP
- Current - Collector (Ic) (Max):
- 500 mA
- Voltage - Collector Emitter Breakdown (Max):
- 40 V
- Vce Saturation (Max) @ Ib, Ic:
- 350mV @ 50mA, 500mA
- Current - Collector Cutoff (Max):
- 100nA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 150 @ 100mA, 2V
- Power - Max:
- 250 mW
- Frequency - Transition:
- 100MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- X1-DFN1006-3
DSS3540M-7B FAQ
1.How can I place an order for DSS3540M-7B through Aetrix?
Please submit a Request for Quotation (RFQ) for DSS3540M-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 DSS3540M-7B reliable?
The price and inventory of DSS3540M-7B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DSS3540M-7B is usually 5 days.
3.What payment methods are accepted for DSS3540M-7B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DSS3540M-7B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DSS3540M-7B?
DSS3540M-7B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DSS3540M-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 DSS3540M-7B?
For technical support, including DSS3540M-7B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DSS3540M-7B requirements.
6.How does Aetrix verify that DSS3540M-7B is sourced from the original manufacturer or authorized distributors?
All DSS3540M-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 DSS3540M-7B meets industry standards.
7.What is the process for return or replacement of DSS3540M-7B?
All DSS3540M-7B units undergo pre-shipment inspection (PSI). If there is an issue with DSS3540M-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 DSS3540M-7B part is unused and in its original packaging.
Return procedure for DSS3540M-7B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
DSS3540M-7B Tags
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Diodes Incorporated
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Diodes Incorporated
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