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Diodes Incorporated MMSTA55-7
- Part No.:
- MMSTA55-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- -
- Datasheet:
-
MMSTA55-7.pdf
- Description:
- TRANS PNP 60V 0.5A SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:498
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Product details
Overview
MMSTA55-7 from Diodes Incorporated is a PNP small-signal surface-mount transistor in SOT-323 package, rated for -60 V VCEO, -500 mA IC, and 200 mW PD, optimized for low-power amplification and switching in space-constrained portable electronics.
For engineers reviewing the MMSTA55-7 datasheet, MMSTA55-7 pinout, MMSTA55-7 application, or MMSTA55-7 equivalent, key selection criteria include its -60 V breakdown rating, hFE ≥100 at -10 mA, VCE(SAT) ≤ -0.25 V at -100 mA/-10 mA, RoHS-compliant green molding compound, and SOT-323 thermal resistance of 625 °C/W.
Technical Context
This PNP bipolar junction transistor uses epitaxial planar die construction for stable DC gain and high-frequency response up to 50 MHz fT. It operates across -55 °C to +150 °C and supports switching and linear amplification with defined saturation characteristics under pulsed test conditions.
Voltage ratings are specified with strict derating above 25 °C ambient per Fig. 1, and hFE exhibits temperature-dependent variation (Fig. 3), requiring design margining for operation at extremes. The device is lead-free, UL 94V-0 rated, and moisture sensitivity Level 1 compliant.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | -60 V - Maximum collector-emitter voltage before avalanche; defines safe operating range in switching circuits. |
| IC (cont.) | -500 mA - Continuous collector current limit; sets maximum load drive capability in active region. |
| PD | 200 mW - Power dissipation on FR-4 PCB per AP02001 layout; determines thermal headroom at 25 °C ambient. |
| hFE | ≥100 - DC current gain at -10 mA IC, -1.0 V VCE; enables predictable base drive sizing. |
| VCE(SAT) | ≤ -0.25 V - Saturation voltage at -100 mA IC/-10 mA IB; minimizes conduction loss in switch mode. |
| fT | 50 MHz - Current gain-bandwidth product at -100 mA IC; supports RF and high-speed digital switching. |
Pinout & Package
Package: SOT-323 - ultra-small surface-mount plastic case (2.0–2.2 mm × 1.15–1.35 mm × 0.25–0.40 mm), UL 94V-0 rated, moisture sensitivity Level 1, lead-free matte tin plating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Emitter (E) | Current source terminal for PNP operation | Connected to higher potential rail; carries full load current in common-emitter switch configuration. |
| Base (B) | Control input for minority carrier injection | Requires negative bias relative to emitter to turn on; typical drive current -10 mA for full saturation. |
| Collector (C) | Current sink terminal | Connected to load and ground reference; voltage swing limited to -60 V maximum relative to emitter. |
Key Features
| Feature | Design Value |
|---|---|
| Epitaxial planar die construction | Ensures consistent hFE and low leakage (ICBO ≤ -100 nA) across production lots and temperature. |
| SOT-323 ultra-small footprint | Enables high-density PCB layouts in wearables, hearing aids, and compact sensor modules where board area < 3 mm² is critical. |
| RoHS-compliant & "Green" molding compound | Meets global environmental regulations without halogenated flame retardants (post-2006 date codes); eliminates Sb2O3. |
| 625 °C/W RθJA | Defines thermal derating slope: power must be reduced by ~0.32 mW/°C above 25 °C ambient per Fig. 1. |
Applications
| Portable Audio Amplifiers | LED Driver Circuits |
|---|---|
Use Scenario: Low-voltage headphone amplifier stage in Bluetooth earbuds with 3.3 V supply and < 100 mW output requirement. IC Role / Device Role / Timing Role: PNP small-signal amplifier providing Class-A bias and current gain for audio signal buffering. Use Value: hFE ≥100 ensures stable gain at -10 mA bias; VCE(SAT) ≤ -0.25 V minimizes quiescent voltage drop and thermal rise in sealed enclosure. | Use Scenario: Constant-current LED dimming control in smart lighting modules using PWM-driven base bias. IC Role / Device Role / Timing Role: Low-side PNP switch regulating LED current via emitter-follower configuration. Use Value: -60 V VCEO accommodates transient spikes in 24 V industrial LED strings; SOT-323 allows placement adjacent to LEDs on thermally constrained boards. |
| Power Management Enable Switches | Signal-Level Voltage Translation |
Use Scenario: Enable/disable path for 5 V auxiliary rail in battery-powered IoT sensor node with sleep-mode current < 1 µA. IC Role / Device Role / Timing Role: High-side PNP switch controlling VCC delivery to peripheral ICs. Use Value: ICBO ≤ -100 nA ensures negligible leakage during deep sleep; -4.0 V VEBO rating supports logic-level enable signals referenced to 3.3 V microcontroller. | Use Scenario: Level-shifting interface between 1.8 V FPGA I/O and 3.3 V sensor bus in medical diagnostic equipment. IC Role / Device Role / Timing Role: Inverting PNP translator converting low-voltage logic high to 3.3 V-compatible open-collector output. Use Value: 50 MHz fT supports >10 Mbps data rates; tight VBE(SAT) = -1.2 V enables predictable threshold setting with resistor bias network. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP small-signal switching and amplification applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BC807-25,215 | VCEO = -45 V, hFE = 160–400, SOT-23 package (larger footprint) | Higher gain but lower voltage rating; less suitable for 48 V transient environments | Select when higher hFE stability at low IC is prioritized over voltage margin and size. |
| DXT5551-7 | VCEO = -160 V, SOT-563 (dual PNP), 300 mW PD | Higher voltage rating and dual configuration; not pin-compatible; requires layout revision | Choose for designs needing > -80 V robustness or dual-transistor integration in same footprint. |
Compared with BC807-25,215 and DXT5551-7, MMSTA55-7 uniquely balances -60 V rating, SOT-323 miniaturization, and 200 mW thermal performance-making it optimal for space-limited, medium-voltage portable systems where leakage and RoHS compliance are critical.
Availability
MMSTA55-7 is available at Aetrix Electronics and suitable for portable audio amplifiers, LED driver circuits, power management enable switches, and signal-level voltage translation requiring stable component supply and RoHS-compliant sourcing.
Supply support for MMSTA55-7 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, energy-efficient components for consumer, industrial, and automotive markets.
The MMSTA55-7 belongs to Diodes' small-signal transistor product line, designed specifically for miniaturized, low-power analog and switching functions in battery-operated and thermally constrained applications.
FAQ
What is the maximum junction temperature for MMSTA55-7?
The absolute maximum junction temperature is +150 °C, aligned with its storage temperature rating. Operation at this limit requires derating power dissipation per Fig. 1 and ensuring thermal resistance from junction to ambient remains ≤625 °C/W under actual PCB layout and airflow conditions.
Is MMSTA55-7 pin-compatible with NPN counterparts like MMSTA05-7?
No-MMSTA55-7 (PNP) and MMSTA05-7 (NPN) share the SOT-323 package and pinout order (E-B-C), but polarity reversal means direct substitution requires circuit topology changes, including reversed biasing and signal inversion logic.
Does MMSTA55-7 require special handling for moisture sensitivity?
Yes-it is rated Moisture Sensitivity Level 1 per J-STD-020C, meaning it may be stored indefinitely at ≤30 °C/60% RH without baking. However, reflow profiles must still comply with lead-free soldering requirements (peak 260 °C, < 30 sec above 217 °C).
Can MMSTA55-7 be used in linear amplifier configurations?
Yes-its hFE ≥100 at -10 mA and low VCE(SAT) support Class-A and Class-AB biasing. For linear use, ensure VCE stays within safe operating area (SOA) limits shown in datasheet Fig. 1 and avoid simultaneous high VCE/high IC combinations that exceed 200 mW.
MMSTA55-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Cut Tape (CT)
- Product Status:
- Active
- Transistor Type:
- -
- Current - Collector (Ic) (Max):
- -
- Voltage - Collector Emitter Breakdown (Max):
- -
- Vce Saturation (Max) @ Ib, Ic:
- -
- Current - Collector Cutoff (Max):
- -
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- -
- Power - Max:
- -
- Frequency - Transition:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MMSTA55-7 FAQ
1.How can I place an order for MMSTA55-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSTA55-7 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 MMSTA55-7 reliable?
The price and inventory of MMSTA55-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSTA55-7 is usually 5 days.
3.What payment methods are accepted for MMSTA55-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSTA55-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSTA55-7?
MMSTA55-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSTA55-7 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 MMSTA55-7?
For technical support, including MMSTA55-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSTA55-7 requirements.
6.How does Aetrix verify that MMSTA55-7 is sourced from the original manufacturer or authorized distributors?
All MMSTA55-7 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 MMSTA55-7 meets industry standards.
7.What is the process for return or replacement of MMSTA55-7?
All MMSTA55-7 units undergo pre-shipment inspection (PSI). If there is an issue with MMSTA55-7, 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 MMSTA55-7 part is unused and in its original packaging.
Return procedure for MMSTA55-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMSTA55-7 Tags
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