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Diodes Incorporated MMSTA64-7
- Part No.:
- MMSTA64-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MMSTA64-7.pdf
- Description:
- TRANS PNP DARL 30V 0.5A SOT-323
- Quantity:
- Payment:
- Shipping:
Inventory:5,709
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Product details
Overview
MMSTA64-7 from Diodes Incorporated is a PNP epitaxial planar Darlington transistor in SOT-323 package, rated for -30 V VCEO, -500 mA IC, and 200 mW power dissipation, with DC current gain hFE up to 20,000 at -100 mA, used in medium-power switching and amplification circuits in space-constrained consumer and industrial control modules.
For engineers reviewing the MMSTA64-7 datasheet, MMSTA64-7 pinout, MMSTA64-7 application, or MMSTA64-7 equivalent, key selection criteria include verified Darlington saturation performance (VCE(SAT) ≤ -1.5 V @ -100 mA), thermal resistance (RθJA = 625 °C/W), RoHS-compliant green molding compound, and SOT-323 footprint compatibility with high-density PCB layouts.
Technical Context
This device implements a two-stage monolithic PNP Darlington configuration delivering high current gain without external bias network complexity. Its VBE(SAT) of -2.0 V at -100 mA reflects base-emitter junction stacking, while fT = 125 MHz enables stable operation beyond audio frequencies.
The SOT-323 package supports surface-mount reflow with J-STD-020C Level 1 moisture sensitivity and UL 94V-0 flammability rating. Thermal derating follows a linear 0.32 mW/°C reduction above 25°C ambient, validated per AP02001 pad layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | -30 V - Maximum safe collector-emitter voltage before breakdown in common-emitter configuration |
| IC | -500 mA - Continuous collector current handling capacity under specified thermal conditions |
| PD | 200 mW - Power dissipation limit on FR-4 PCB with AP02001 layout at 25°C ambient |
| hFE | 10,000–20,000 - Confirmed DC current gain range at -10 mA and -100 mA, enabling low-base-drive switching |
| VCE(SAT) | ≤ -1.5 V @ -100 mA / -100 μA - Verified saturation voltage ensuring <1.5 V drop across switch in fully on state |
| fT | 125 MHz - Gain-bandwidth product confirming usable frequency response up to mid-VHF range |
Pinout & Package
Package: SOT-323 - ultra-small plastic surface-mount case (2.00–2.20 mm length × 1.15–1.35 mm width × 0.25–0.40 mm height), UL 94V-0 rated, lead-free matte tin plating over Alloy 42 leadframe.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Emitter (E) | Current sink terminal for PNP Darlington pair | Connected to higher potential rail; carries full load current in switching applications |
| Base (B) | Control input for internal Darlington base drive | Requires minimal current (e.g., -100 μA) to saturate -100 mA collector output |
| Collector (C) | Output current source terminal | Connected to load; voltage swing limited to -30 V maximum relative to emitter |
Key Features
| Feature | Design Value |
|---|---|
| Monolithic Darlington structure | Integrated two-transistor cascade eliminates external base-resistor networks and improves gain stability |
| High hFE at high IC | 10,000–20,000 gain maintained at -100 mA enables microcontroller GPIO direct drive without buffer stages |
| SOT-323 footprint | 0.006 g mass and 2.2 mm × 1.35 mm outline supports high-density routing in wearables and IoT sensor nodes |
| Green molding compound | Halogen-free, Sb2O3-free encapsulation compliant with Diodes Inc.'s environmental policy since Date Code 0627 |
Applications
| LED Driver Circuit | Low-Voltage Relay Control |
|---|---|
Use Scenario: Driving 20–50 mA indicator LEDs from 3.3 V MCU outputs in portable instrumentation. IC Role / Device Role / Timing Role: PNP Darlington switch providing current amplification and logic inversion. Use Value: Eliminates need for discrete base resistor and second transistor; VCE(SAT) ≤ -1.5 V ensures >1.8 V forward bias margin for red/green LEDs. |
Use Scenario: Activating 5 V/12 V electromagnetic relays in HVAC control panels with 3.3 V logic signals. IC Role / Device Role / Timing Role: Medium-power interface switch translating low-current logic to relay coil current. Use Value: hFE ≥ 10,000 at -100 mA allows reliable turn-on with <100 μA base drive, reducing MCU pin loading. |
| DC Motor Speed Control | Industrial Sensor Signal Conditioning |
Use Scenario: PWM-driven 24 V brushed DC motor (≤500 mA stall) in automated valve actuators. IC Role / Device Role / Timing Role: High-gain switching element in low-side or high-side driver stage. Use Value: Confirmed -500 mA IC rating and -30 V VCEO support direct connection to 24 V supply rails with safety margin. |
Use Scenario: Amplifying low-level analog signals from thermistors or RTDs in programmable logic controllers. IC Role / Device Role / Timing Role: Medium-gain linear amplifier stage with predictable hFE vs. IC curve (Fig. 3). Use Value: Stable hFE >5,000 down to -10 mA enables precision current-source biasing for bridge sensors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP Darlington switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMSTA63-7-F | Lower hFE (5,000–10,000), identical VCEO/IC/package | Suitable where gain margin >5,000 suffices and cost optimization is prioritized | Select when design tolerates reduced current gain at high IC and requires same footprint |
| DMT3005LFG-7 | PNP MOSFET (not bipolar); RDS(on) = 1.2 Ω, VGS(th) = -1.5 V, no gate current required | Better efficiency in high-duty-cycle switching; no base drive loss or thermal runaway risk | Prefer for battery-powered systems needing <100 nA off-state leakage and lower conduction loss |
Compared with MMSTA63-7-F, MMSTA64-7 offers doubled hFE headroom at high current; versus DMT3005LFG-7, it provides superior linearity and lower gate-drive complexity but higher saturation voltage and base current dependency.
Availability
MMSTA64-7 is available at Aetrix Electronics and suitable for LED driver circuits, relay interface modules, DC motor control subsystems, and industrial sensor signal conditioning requiring stable component supply and long-term manufacturability.
Supply support for MMSTA64-7 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, industry-standard components for power management, signal integrity, and protection.
MMSTA64-7 belongs to Diodes' ultra-small-signal transistor family designed specifically for space-constrained, medium-power switching and amplification in consumer, industrial, and automotive-qualified applications.
FAQ
What is the maximum safe operating temperature for MMSTA64-7?
The MMSTA64-7 has an operating junction temperature range of -55°C to +150°C. Derating begins at 25°C ambient, with maximum power dissipation dropping linearly to zero at +150°C, based on RθJA = 625 °C/W and AP02001 PCB layout.
Can MMSTA64-7 replace a standard PNP BJT like BC807 in existing designs?
No-MMSTA64-7 is a Darlington device with ~2× VBE(SAT) (-2.0 V) and much higher hFE. Direct substitution would cause excessive base drive voltage drop and possible logic-level incompatibility unless circuit biasing is revised for Darlington characteristics.
Is MMSTA64-7 suitable for linear amplification applications?
Yes-its hFE remains stable from -1 mA to -100 mA (Fig. 3), and VCE(SAT) and fT = 125 MHz support low-distortion small-signal amplification in audio and sensor front-ends where gain stability outweighs speed requirements.
Does MMSTA64-7 require a heatsink in typical SOT-323 applications?
No-its 200 mW PD rating and 625 °C/W RθJA are specified for standard FR-4 PCB mounting per AP02001. Heatsinking is unnecessary below ~150 mW dissipation at 25°C ambient; thermal performance relies on copper area, not external heatsinks.
MMSTA64-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Transistor Type:
- PNP - Darlington
- Current - Collector (Ic) (Max):
- 500 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:
- 200 mW
- Frequency - Transition:
- 125MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-323
MMSTA64-7 FAQ
1.How can I place an order for MMSTA64-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSTA64-7 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 MMSTA64-7 reliable?
The price and inventory of MMSTA64-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSTA64-7 is usually 5 days.
3.What payment methods are accepted for MMSTA64-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSTA64-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSTA64-7?
MMSTA64-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSTA64-7 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 MMSTA64-7?
For technical support, including MMSTA64-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSTA64-7 requirements.
6.How does Aetrix verify that MMSTA64-7 is sourced from the original manufacturer or authorized distributors?
All MMSTA64-7 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 MMSTA64-7 meets industry standards.
7.What is the process for return or replacement of MMSTA64-7?
All MMSTA64-7 units undergo pre-shipment inspection (PSI). If there is an issue with MMSTA64-7, 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 MMSTA64-7 part is unused and in its original packaging.
Return procedure for MMSTA64-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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