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Diodes Incorporated MMBTA14-7
- Part No.:
- MMBTA14-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBTA14-7.pdf
- Description:
- TRANS NPN DARL 30V 0.3A SOT-23-3
- Quantity:
- Payment:
- Shipping:
Inventory:7,826
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Product details
Overview
MMBTA14-7 from Diodes Incorporated is a 30V NPN Darlington transistor in SOT23 package, designed for medium-power amplification and switching with minimum DC current gain of 10,000 at IC = 10mA/VCE = 5V and 20,000 at IC = 100mA/VCE = 5V, VCE(sat) ≤ 1.5V at IC = 100mA/IB = 100µA, and fT = 125MHz - used in relay drivers, LED matrix controllers, and low-frequency signal amplification stages.
For engineers reviewing the MMBTA14-7 datasheet, MMBTA14-7 pinout, MMBTA14-7 application, or MMBTA14-7 equivalent, key selection criteria include guaranteed high hFE across operating current range, SOT23 thermal derating compliance (300 mW @ 25°C, 417°C/W RθJA), ESD robustness (4 kV HBM), and complementary PNP pairing with MMBTA64.
Technical Context
This Darlington pair integrates two NPN transistors in cascade to deliver ultra-high current gain while maintaining single-base control. It operates with VCEO = 30V and VEBO = 10V, enabling use in low-voltage logic-driven loads where base drive current must be minimized.
Its small-signal behavior is characterized by Cobo = 8.0 pF and Cibo = 15 pF at specified bias conditions, supporting stable operation up to 125 MHz fT - sufficient for audio-frequency amplification and PWM-controlled switching below 100 kHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 30 V - Maximum collector-emitter voltage before breakdown; sets safe operating limit for load-side voltage swing. |
| hFE (min) | 10,000 @ IC = 10mA - Ensures <10 µA base current suffices to switch 100 mA collector load at 5 V CE. |
| VCE(sat) | ≤1.5 V @ IC = 100mA/IB = 100µA - Limits power loss to ≤150 mW in saturated switching mode. |
| fT | 125 MHz - Supports stable small-signal amplification up to audio band without phase inversion risk. |
| RθJA | 417 °C/W - Requires minimal PCB copper area (1 oz, single-sided FR-4) to maintain junction temperature within -55°C to +150°C range. |
| ESD HBM | 4,000 V - Enables handling without special static precautions in standard assembly environments. |
Pinout & Package
Package: SOT23 - surface-mount plastic package with matte tin terminals, moisture sensitivity level 1, UL 94V-0 rated molding compound, weight ≈ 0.008 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | E | Current sink node; connected to ground or low-side return path in switching configurations. |
| 2 (Base) | B | Control input; accepts low-current logic-level drive to enable high-gain amplification or saturation. |
| 3 (Collector) | C | High-current output node; interfaces with load (e.g., relay coil, LED string, solenoid). |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-high DC current gain | hFE ≥ 10,000 at 10 mA enables microcontroller GPIO direct drive without external base resistors. |
| Darlington architecture | Two cascaded NPN stages reduce required base current by factor of ~10⁴ vs. single transistor. |
| SOT23 footprint compatibility | Standard 3-pin SOT23 layout allows drop-in replacement in space-constrained PCBs. |
| Green RoHS compliance | Halogen- and antimony-free (<900 ppm Br/Cl, <1000 ppm Sb) meets automotive and industrial environmental mandates. |
Applications
| Relay Driver Circuits | LED Matrix Row Drivers |
|---|---|
Use Scenario: Driving 12 V/50 mA electromagnetic relays from 3.3 V MCU outputs. IC Role / Device Role: High-gain current amplifier translating logic-level signals into sufficient coil current. Use Value: Eliminates need for discrete base-resistor networks or additional driver ICs, reducing BOM count and board area. | Use Scenario: Scanning 8×8 monochrome LED displays with row-select current sinking. IC Role / Device Role: Low-side current sink for multiplexed row lines requiring >20 mA per segment. Use Value: Maintains consistent brightness across rows via stable hFE and low VCE(sat), minimizing thermal drift. |
| Low-Frequency Signal Amplifiers | Industrial Sensor Interface Stages |
Use Scenario: Boosting weak analog signals from thermistors or potentiometers prior to ADC sampling. IC Role / Device Role: Class-A common-emitter amplifier with fixed bias network. Use Value: Delivers predictable voltage gain with minimal distortion below 20 kHz due to stable fT and low Cobo. | Use Scenario: Conditioning 4–20 mA loop sensor outputs in PLC I/O modules. IC Role / Device Role: Current-to-voltage converter stage with high input impedance and rail-to-rail compliance. Use Value: Enables precise scaling using feedback resistors while rejecting noise via high hFE and low IEBO (<100 nA). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Darlington transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBTA14-7-F | Same die, identical electrical specs; differs only in tape/reel packaging (3,000 pcs vs. 10,000 pcs). | No functional difference; selected based on production volume and assembly line feed requirements. | Preferred for high-volume SMT lines requiring standard 7-inch reels. |
| ULN2003A | 7-channel Darlington array in SO-16; per-channel hFE ~1000, higher VCE(sat) (~1.3 V), integrated clamp diodes. | Used when multiple parallel loads require coordinated control; not suitable for single-device replacement. | Choose when driving >1 relay or LED string simultaneously; avoid for single-channel optimization. |
Compared with MMBTA14-7, MMBTA14-7-F offers identical performance in alternate reel size, while ULN2003A trades single-device efficiency for multi-channel integration and built-in protection - making it appropriate only for systems requiring consolidated drive capability rather than minimal footprint or maximum gain per channel.
Availability
MMBTA14-7 is available at Aetrix Electronics and suitable for relay driver circuits, LED matrix row drivers, low-frequency signal amplifiers, and industrial sensor interface stages requiring stable component supply and long-term manufacturability.
Supply support for MMBTA14-7 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 North America.
The MMBTA14-7 belongs to Diodes' general-purpose bipolar transistor product line, engineered for cost-sensitive, medium-power linear and switching applications in consumer, industrial, and automotive electronics where high current gain and compact packaging are critical.
FAQ
What is the maximum continuous collector current for MMBTA14-7?
The absolute maximum collector current is 300 mA per Absolute Maximum Ratings table. However, sustained operation above 100 mA requires thermal derating per Figure 1: at 70°C ambient, maximum allowable PD drops to ~150 mW, limiting practical IC to ~100 mA with adequate PCB copper area.
Does MMBTA14-7 have integrated base-emitter resistors?
No. The MMBTA14-7 is a bare Darlington transistor without internal base resistors. External base resistors must be used to set operating point and prevent thermal runaway - typical values range from 10 kΩ to 100 kΩ depending on drive voltage and required collector current.
Can MMBTA14-7 replace MMBTA13-7 in existing designs?
Yes, with verification of gain requirements. MMBTA14-7 has higher minimum hFE (10,000 vs. 5,000 at 10 mA), lower VCE(sat), and same pinout/package. It may improve switching speed and reduce base drive burden, but designers should confirm stability under worst-case hFE variation and thermal conditions.
Is MMBTA14-7 qualified for automotive applications?
MMBTA14-7 itself is not AEC-Q101 qualified. Diodes offers automotive-grade variants (e.g., MMBTA14Q-7-F) with PPAP documentation, IATF 16949 manufacturing, and extended temperature validation. Standard MMBTA14-7 is intended for commercial/industrial use unless explicitly requalified.
MMBTA14-7 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:
- Discontinued at Digi-Key
- Transistor Type:
- NPN - Darlington
- Current - Collector (Ic) (Max):
- 300 mA
- Voltage - Collector Emitter Breakdown (Max):
- 30 V
- Vce Saturation (Max) @ Ib, Ic:
- 1.5V @ 100µA, 100mA
- Current - Collector Cutoff (Max):
- 100nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 20000 @ 100mA, 5V
- Power - Max:
- 300 mW
- Frequency - Transition:
- 125MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
MMBTA14-7 FAQ
1.How can I place an order for MMBTA14-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBTA14-7 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 MMBTA14-7 reliable?
The price and inventory of MMBTA14-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBTA14-7 is usually 5 days.
3.What payment methods are accepted for MMBTA14-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBTA14-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBTA14-7?
MMBTA14-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBTA14-7 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 MMBTA14-7?
For technical support, including MMBTA14-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBTA14-7 requirements.
6.How does Aetrix verify that MMBTA14-7 is sourced from the original manufacturer or authorized distributors?
All MMBTA14-7 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 MMBTA14-7 meets industry standards.
7.What is the process for return or replacement of MMBTA14-7?
All MMBTA14-7 units undergo pre-shipment inspection (PSI). If there is an issue with MMBTA14-7, 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 MMBTA14-7 part is unused and in its original packaging.
Return procedure for MMBTA14-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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