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Diodes Incorporated MMBTA56-7
- Part No.:
- MMBTA56-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBTA56-7.pdf
- Description:
- TRANS PNP 80V 0.5A SOT-23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,580
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Product details
Overview
MMBTA56-7 from Diodes Incorporated is a 80V PNP medium-power bipolar junction transistor in SOT23 package, rated for -500mA continuous collector current and 350mW power dissipation at 25°C ambient. It delivers hFE ≥100 at -10mA/-1.0V, VCE(sat) ≤ -0.25V at -100mA/-10mA drive, and fT ≥50MHz, enabling use in low-voltage switching and linear amplification stages of industrial control interfaces.
For engineers reviewing the MMBTA56-7 datasheet, MMBTA56-7 pinout, MMBTA56-7 application, or MMBTA56-7 equivalent, key selection criteria include its -80V VCEO rating, SOT23 thermal resistance (RθJA = 357°C/W on 15mm×15mm copper), ESD HBM rating of 4kV, complementary pairing with MMBTA06, and automotive-grade variant (MMBTA56Q) availability.
Technical Context
The MMBTA56-7 operates as a general-purpose PNP BJT optimized for medium-speed switching and analog amplification in space-constrained designs. Its epitaxial planar die construction ensures stable gain and breakdown characteristics across temperature, while the SOT23 package enables high-density PCB layouts with verified solderability per MIL-STD-202.
It functions in active, saturation, and cutoff regions with defined DC parameters: VBE(sat) ≤ -1.2V at -100mA, BVEBO ≥ -4.0V, and ICEX ≤ -100nA at -80V VCE. Thermal derating follows a linear curve to zero power at +150°C ambient, supporting operation in extended industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | -80 V: Maximum allowable collector-emitter voltage before avalanche conduction in common-emitter configuration. |
| IC (cont.) | -500 mA: Continuous collector current limit defining maximum load-handling capability in switching or amplification. |
| PD | 350 mW: Power dissipation limit when mounted on 15mm×15mm 1oz copper PCB under still air conditions. |
| hFE | ≥100: Minimum DC current gain at -10mA IC, -1.0V VCE, ensuring reliable base drive efficiency. |
| fT | ≥50 MHz: Transition frequency indicating usable bandwidth for small-signal amplification up to mid-VHF range. |
| RθJA | 357 °C/W: Junction-to-ambient thermal resistance on specified PCB layout, critical for thermal margin calculation. |
| ESD HBM | 4,000 V: Human Body Model withstand level, supporting robust handling during manual assembly and board-level testing. |
Pinout & Package
Package: SOT23 - surface-mount plastic package with matte tin-plated leads, UL 94V-0 flammability rating, moisture sensitivity level 1, and approximate weight of 0.008 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Emitter (E) | Current source terminal in PNP configuration | Connected to higher potential rail; defines reference for base bias and collector current sourcing. |
| Base (B) | Control input for minority-carrier injection | Receives negative-going drive signal to turn on transistor; requires current-limiting resistor in series. |
| Collector (C) | Current sink terminal in PNP configuration | Connected to load; carries full emitter current minus base current; voltage swing limited by VCEO. |
Key Features
| Feature | Design Value |
|---|---|
| Epitaxial planar die construction | Ensures consistent VBR and hFE across production lots and temperature, reducing calibration overhead in production test. |
| Complementary NPN pairing (MMBTA06) | Enables direct substitution in push-pull or differential pair topologies without redesigning bias networks. |
| Lead-free & halogen-free "Green" compliance | Meets RoHS 3 (2015/863/EU) and automotive ELV directives, eliminating bromine (<900ppm), chlorine (<900ppm), and antimony (<1000ppm). |
| SOT23 thermal performance (RθJL = 350°C/W) | Supports localized heat extraction via soldered leads, improving reliability in thermally dense mixed-signal PCBs. |
Applications
| Industrial Sensor Interface | LED Driver Stage |
|---|---|
Use Scenario: Amplifying low-level output from RTD or thermistor bridges into ADC input range. IC Role / Device Role / Timing Role: PNP emitter-follower buffer providing high-input impedance and low-output impedance signal conditioning. Use Value: Maintains linearity over -40°C to +85°C with hFE stability and <100nA leakage preserving bridge balance accuracy. | Use Scenario: Driving 20–100mA indicator LEDs in programmable logic controllers. IC Role / Device Role / Timing Role: Low-side switch controlling LED anode connection to regulated 5V/3.3V rail. Use Value: VCE(sat) ≤ -0.25V minimizes power loss and self-heating, enabling 30+ LEDs per 10cm² PCB area. |
| Power Supply Enable Control | Level-Shifting Logic Interface |
Use Scenario: Enabling/disabling auxiliary 12V rails in multi-rail embedded power systems. IC Role / Device Role / Timing Role: High-side switch controlled by 3.3V microcontroller GPIO. Use Value: -80V VCEO provides 3× safety margin over 12V rail, preventing latch-up during transient overvoltage events. | Use Scenario: Translating 1.8V logic outputs to 5V-compatible inputs in mixed-voltage MCU peripherals. IC Role / Device Role / Timing Role: Active-low level shifter using common-emitter configuration with pull-up resistor. Use Value: 50MHz fT supports clean edge transitions up to 5MHz clock rates without added propagation delay. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP medium-power transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBTA56-7-F | Same die, identical electrical specs, differentiated only by RoHS-compliant marking and tape/reel packaging. | No functional difference; used interchangeably in automated SMT lines requiring 3,000-unit reels. | Select when full traceability and green compliance documentation are required for OEM audits. |
| PN2907A | Higher VCEO (-60V vs. -80V), lower hFE (min 100 vs. min 100 at same test condition), TO-92 package (larger footprint, higher RθJA). | Not suitable for high-density SMT layouts; thermal performance limits power handling in compact enclosures. | Choose only for through-hole prototyping or legacy board rework where SOT23 placement is unavailable. |
Compared with MMBTA56-7, MMBTA56-7-F offers identical performance with certified green packaging, while PN2907A trades SMT compatibility and thermal efficiency for through-hole serviceability-making the original optimal for volume SMT production with strict thermal and environmental requirements.
Availability
MMBTA56-7 is available at Aetrix Electronics and suitable for industrial sensor interfaces, LED driver stages, power supply enable control, and level-shifting logic interfaces requiring stable component supply and long-term manufacturability.
Supply support for MMBTA56-7 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, specializing in high-reliability components for industrial, computing, and consumer applications.
The MMBTA55/MMBTA56 series belongs to Diodes' general-purpose bipolar transistor product line, designed specifically for cost-sensitive, space-constrained switching and amplification tasks in non-automotive industrial equipment.
FAQ
What is the maximum operating temperature for MMBTA56-7?
The MMBTA56-7 has an operating junction temperature range of -55°C to +150°C. Its maximum ambient temperature depends on power dissipation and PCB layout: at 350mW, ambient must not exceed +85°C on a 15mm×15mm 1oz copper pad per the derating curve in DS30054 Rev. 14-2, Figure 1.
Is MMBTA56-7 pin-compatible with MMBTA55-7?
Yes-both share identical SOT23 pinout (Emitter-Base-Collector), but differ electrically: MMBTA55-7 has -60V VCEO/VCBO, while MMBTA56-7 is rated for -80V. Substitution is safe only if the circuit's maximum collector-emitter voltage remains below -60V when using MMBTA55-7.
Does MMBTA56-7 require a heatsink in typical applications?
No heatsink is required for MMBTA56-7 in standard applications dissipating ≤150mW. Its RθJA of 357°C/W allows junction temperatures to stay within limits at +70°C ambient even at full 350mW-if mounted per recommended pad layout (15mm×15mm 1oz copper). Forced airflow or copper pour improves margin.
Can MMBTA56-7 be used in automotive applications?
The standard MMBTA56-7 is not AEC-Q101 qualified. For automotive use, Diodes offers the MMBTA56Q variant-identical electrical specs with enhanced process controls, PPAP documentation, and guaranteed operation over -40°C to +125°C junction temperature.
MMBTA56-7 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:
- PNP
- Current - Collector (Ic) (Max):
- 500 mA
- Voltage - Collector Emitter Breakdown (Max):
- 80 V
- Vce Saturation (Max) @ Ib, Ic:
- 250mV @ 10mA, 100mA
- Current - Collector Cutoff (Max):
- 100nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 100 @ 100mA, 1V
- Power - Max:
- 300 mW
- Frequency - Transition:
- 50MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
MMBTA56-7 FAQ
1.How can I place an order for MMBTA56-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBTA56-7 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 MMBTA56-7 reliable?
The price and inventory of MMBTA56-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBTA56-7 is usually 5 days.
3.What payment methods are accepted for MMBTA56-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBTA56-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBTA56-7?
MMBTA56-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBTA56-7 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 MMBTA56-7?
For technical support, including MMBTA56-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBTA56-7 requirements.
6.How does Aetrix verify that MMBTA56-7 is sourced from the original manufacturer or authorized distributors?
All MMBTA56-7 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 MMBTA56-7 meets industry standards.
7.What is the process for return or replacement of MMBTA56-7?
All MMBTA56-7 units undergo pre-shipment inspection (PSI). If there is an issue with MMBTA56-7, 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 MMBTA56-7 part is unused and in its original packaging.
Return procedure for MMBTA56-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMBTA56-7 Tags
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Diodes Incorporated
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