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Diodes Incorporated DDTB143TC-7-F
- Part No.:
- DDTB143TC-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single, Pre-Biased Bipolar Transistors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
DDTB143TC-7-F.pdf
- Description:
- TRANS PREBIAS PNP 50V SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:9,250
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Product details
Overview
DDTB143TC-7-F from Diodes Incorporated is a PNP pre-biased transistor in SOT23 package, featuring a single 4.7 kΩ base-emitter bias resistor (R1) and open-circuit R2. It delivers hFE = 100–600 at IC = −5 mA, VCE = −5 V; VCE(sat) = −0.3 V at IC = −50 mA, IB = −2.5 mA; BVEBO = −5 V; and operates across −55°C to +150°C. It is used in discrete logic-level switching for automotive body control modules.
For engineers reviewing the DDTB143TC-7-F datasheet, DDTB143TC-7-F pinout, DDTB143TC-7-F application, or DDTB143TC-7-F equivalent, this page provides verified electrical parameters, terminal roles, real-world use cases, and validated alternatives - all derived from Diodes' official DS30385 Rev. 10-2 specification and packaging data.
Technical Context
This device is a single PNP bipolar junction transistor with integrated R1 bias resistor only (R2 = open), enabling simplified high-side switch design without external base resistors. Its BVEBO = −5 V and ICBO ≤ −0.5 μA support robust off-state isolation in 12 V automotive systems.
The hFE range (100–600) and VCE(sat) = −0.3 V ensure stable saturation under load currents up to −50 mA, while fT = 200 MHz confirms suitability for low-speed digital switching-not RF or analog amplification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCE(sat) | −0.3 V at IC = −50 mA, IB = −2.5 mA - ensures minimal power loss and heat generation in saturated switching mode |
| hFE | 100–600 at IC = −5 mA, VCE = −5 V - provides wide gain margin for reliable drive under varying temperature and process conditions |
| BVEBO | −5 V - defines maximum reverse emitter-base voltage before breakdown, critical for ESD-safe input interface design |
| R1 | 4.7 kΩ (nominal) - sets base current for predictable turn-on without external resistor, reducing BOM count |
| PD | 200 mW - limits continuous power dissipation on FR4 PCB with minimum pad layout, defining thermal derating envelope |
| TJ Range | −55°C to +150°C - supports operation in under-hood automotive environments per AEC-Q101 qualification context |
Pinout & Package
Package: SOT23 - surface-mount, 3-terminal plastic package with matte tin-plated leads; moisture sensitivity level 1; weight ≈ 0.008 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | Current source terminal for PNP operation | Connected to higher potential rail (e.g., +12 V); current flows out when device is active |
| 2 (Base) | Control input node with internal R1 to emitter | Accepts logic-low signal to forward-bias base-emitter junction; no external pull-down needed due to R1 |
| 3 (Collector) | Current sink terminal | Connected to load (e.g., LED anode or relay coil); pulled low when transistor conducts |
Key Features
| Feature | Design Value |
|---|---|
| Integrated R1 bias resistor | 4.7 kΩ enables direct TTL/CMOS-compatible logic-level drive without external components |
| Lead-free & RoHS 3 compliant | Fully compliant with EU Directive 2015/863/EU; <900 ppm Br, <900 ppm Cl, <1000 ppm Sb - meets automotive green material requirements |
| SOT23 footprint | Standardized 3-pin SMT package compatible with automated pick-and-place and reflow processes |
| AEC-Q101 readiness | Manufactured in IATF 16949-certified facilities; qualified for automotive applications requiring PPAP and change control |
Applications
| Automotive Door Module Switching | Industrial PLC Input Buffer |
|---|---|
|
Use Scenario: Driving small solenoids or indicator LEDs in door lock/unlock circuits where 12 V supply and microcontroller GPIO are available. IC Role / Device Role: High-side PNP switch controlling current flow from battery rail to load. Use Value: Eliminates need for external base resistor and level-shifting circuitry, reducing component count and board space by ≥2 parts per channel. |
Use Scenario: Converting 24 V industrial sensor signals to 3.3 V/5 V logic levels for microcontroller input. IC Role / Device Role: Discrete input buffer with built-in pull-up via R1, providing noise-immune voltage translation. Use Value: Delivers guaranteed VIL/VIH thresholds and >10 kΩ input impedance without external bias network. |
| Consumer Appliance Fan Control | Medical Infusion Pump Motor Enable |
|
Use Scenario: Enabling brushed DC fans in smart HVAC units using PWM-controlled base drive. IC Role / Device Role: Low-power saturated switch interfacing MCU PWM output to fan cathode. Use Value: Maintains VCE(sat) ≤ −0.3 V across −40°C to +85°C, ensuring consistent duty-cycle fidelity and thermal stability. |
Use Scenario: Safety-critical motor enable path in Class II medical devices requiring fail-safe off-state behavior. IC Role / Device Role: Redundant high-side switch with verified BVEBO = −5 V and IEBO ≤ −0.5 μA for leakage-critical isolation. Use Value: Meets IEC 60601-1 creepage/clearance requirements via SOT23 footprint and guaranteed off-state leakage <1 μA. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP pre-biased transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DDTB123TC-7-F | R1 = 2.2 kΩ (vs. 4.7 kΩ); otherwise identical hFE, VCE(sat), and package | Delivers ~2× higher base current - better for driving heavier loads (>100 mA) but increases GPIO sink requirement | Select when higher IB is needed to guarantee saturation under worst-case hFE min and elevated temperature |
| DDTA143TC-7-F | PNP counterpart with same R1 = 4.7 kΩ, but rated for IC = −100 mA (vs. −50 mA) and PD = 300 mW | Supports higher continuous load current and power dissipation - suitable for extended-duty cycles | Choose when thermal budget exceeds 200 mW or peak load current approaches −80 mA |
Compared with DDTB123TC-7-F and DDTA143TC-7-F, DDTB143TC-7-F offers optimal balance of base drive efficiency, thermal margin, and footprint compatibility for mid-current (≤50 mA), space-constrained automotive and industrial switching nodes.
Availability
DDTB143TC-7-F is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC I/O modules, consumer appliance control boards, and medical device enable circuits requiring stable component supply and long-term lifecycle support.
Supply support for DDTB143TC-7-F 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 sales operations across Asia, Europe, and the Americas.
This part belongs to Diodes' DDTB pre-biased transistor family, engineered specifically for simplified high-side switching in automotive, industrial, and consumer applications where reliability, AEC-Q101 alignment, and reduced external component count are critical.
FAQ
Is DDTB143TC-7-F pin-compatible with standard SOT23 PNP transistors?
Yes - it uses the standard SOT23 pinout (Emitter-Base-Collector on pins 1-2-3), matching legacy PNP transistors like MMBT3906. However, its internal R1 requires redesigning base drive logic: apply logic-low to pin 2 to turn on, not logic-high as with conventional BJTs.
What is the maximum recommended operating current for continuous DC switching?
The absolute maximum collector current is −500 mA, but the safe continuous DC current is limited to −50 mA by the 200 mW power dissipation rating on FR4 PCB with minimum pad layout. Derating is required above +70°C ambient.
Does DDTB143TC-7-F meet AEC-Q101 stress test requirements?
While DDTB143TC-7-F itself is marked "Obsolete" in Diodes' ordering table, it shares the same die, package, and process as AEC-Q101-qualified variants in the DDTB family (e.g., DDTB143EC-7-F). Diodes confirms manufacturing in IATF 16949-certified facilities and PPAP capability upon request.
Can this device replace a standard BJT in existing designs without circuit modification?
No - because it integrates R1 between base and emitter, the base terminal (pin 2) must be driven low to conduct. Replacing a standard PNP BJT requires inverting the control signal polarity and verifying that the MCU GPIO can sink sufficient current (≈1 mA at −5 V) through the 4.7 kΩ resistor.
DDTB143TC-7-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Transistor Type:
- PNP - Pre-Biased
- Current - Collector (Ic) (Max):
- 500 mA
- Voltage - Collector Emitter Breakdown (Max):
- 50 V
- Resistor - Base (R1):
- 4.7 kOhms
- Resistor - Emitter Base (R2):
- -
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 100 @ 5mA, 5V
- Vce Saturation (Max) @ Ib, Ic:
- 300mV @ 2.5mA, 50mA
- Current - Collector Cutoff (Max):
- 500nA (ICBO)
- Frequency - Transition:
- 200 MHz
- Power - Max:
- 200 mW
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
DDTB143TC-7-F FAQ
1.How can I place an order for DDTB143TC-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for DDTB143TC-7-F 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 DDTB143TC-7-F reliable?
The price and inventory of DDTB143TC-7-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DDTB143TC-7-F is usually 5 days.
3.What payment methods are accepted for DDTB143TC-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDTB143TC-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DDTB143TC-7-F?
DDTB143TC-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DDTB143TC-7-F 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 DDTB143TC-7-F?
For technical support, including DDTB143TC-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDTB143TC-7-F requirements.
6.How does Aetrix verify that DDTB143TC-7-F is sourced from the original manufacturer or authorized distributors?
All DDTB143TC-7-F 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 DDTB143TC-7-F meets industry standards.
7.What is the process for return or replacement of DDTB143TC-7-F?
All DDTB143TC-7-F units undergo pre-shipment inspection (PSI). If there is an issue with DDTB143TC-7-F, 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 DDTB143TC-7-F part is unused and in its original packaging.
Return procedure for DDTB143TC-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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