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Diodes Incorporated FMMT591QTA
- Part No.:
- FMMT591QTA
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
FMMT591QTA.pdf
- Description:
- TRANS PNP 60V 1A SOT-23-3
- Quantity:
- Payment:
- Shipping:
Inventory:9,652
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Product details
Overview
FMMT591QTA from Diodes Incorporated is a 60V PNP medium-power bipolar junction transistor in SOT23 package, rated for -1A continuous collector current and -60V VCEO, with low saturation resistance (295 mΩ) and AEC-Q101 qualification for automotive power switching applications such as load control in body electronics modules.
For engineers reviewing the FMMT591QTA datasheet, FMMT591QTA pinout, FMMT591QTA application, or FMMT591QTA equivalent, key selection criteria include verified VCEO = -60 V, IC = -1 A, RSAT = 295 mΩ, hFE ≥ 100 at -1 mA, and SOT23 thermal derating behavior under pulsed and DC conditions.
Technical Context
This PNP BJT operates in linear and saturated switching modes with characterized hFE up to -2 A and VCE(SAT) as low as -155 mV at IC = -500 mA / IB = -50 mA. Its safe operating area (SOA) is defined for pulse widths from 100 µs to DC on 15 mm × 15 mm 1 oz copper FR-4 PCB.
Thermal design relies on RθJA = 250 °C/W (still air) and RθJL = 197 °C/W, with transient thermal impedance data provided for single-pulse power dissipation up to 500 mW. ESD robustness meets 4 kV HBM (JEDEC Class 3A) and 400 V MM.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | -60 V - maximum blocking voltage before breakdown in common-emitter configuration |
| IC (cont.) | -1 A - continuous collector current rating defining steady-state power handling capability |
| RSAT | 295 mΩ - equivalent on-resistance at IC = -1 A / IB = -100 mA, enabling low-loss switching |
| hFE | 100–300 - DC current gain range across IC = -1 mA to -2 A, supporting stable bias design |
| fT | 150 MHz - transition frequency indicating usable bandwidth for moderate-speed switching |
| PD | 500 mW - maximum steady-state power dissipation on standard PCB layout |
| ESD HBM | 4,000 V - human-body-model electrostatic discharge tolerance per JEDEC JESD22-A114 |
Pinout & Package
SOT23 plastic surface-mount 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 |
|---|---|---|
| 1 (Emitter) | E | Current sink terminal; connects to higher potential in PNP switching configurations |
| 2 (Base) | B | Control input; requires ~100 mA drive for full saturation at 1 A load |
| 3 (Collector) | C | Main current path output; tied to load return or ground-side switching node |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated reliability for automotive underhood and cabin applications per stress test requirements |
| Low VCE(SAT) | -155 mV at IC = -500 mA enables <150 mW conduction loss in typical load switch designs |
| High ICM | -2 A peak pulse rating supports surge-tolerant operation in motor driver and solenoid control |
| Green compliance | Halogen- and antimony-free, RoHS-compliant construction with <900 ppm Br/Cl and <1000 ppm Sb |
Applications
| Automotive Body Control Module | Industrial Relay Driver |
|---|---|
Use Scenario: Switching 12 V loads such as door locks, interior lighting, and HVAC actuators in vehicle BCMs. IC Role / Device Role / Timing Role: PNP high-side switch controlling ground-referenced loads via base-driven saturation. Use Value: -60 V VCEO withstands load-dump transients; AEC-Q101 ensures field reliability over 15-year automotive lifecycle. | Use Scenario: Driving electromechanical relays in programmable logic controllers and industrial I/O modules. IC Role / Device Role / Timing Role: Medium-power interface transistor translating microcontroller GPIO to relay coil current. Use Value: -1 A IC and -2 A ICM support 500–800 mA relay coils with margin for inrush; SOT23 footprint saves board space. |
| LED Lighting Power Stage | Power Supply Enable Switch |
Use Scenario: Constant-current LED string switching in automotive exterior lighting and signage. IC Role / Device Role / Timing Role: Low-saturation PNP switch regulating current path in high-side LED driver topology. Use Value: 295 mΩ RSAT limits conduction loss to <300 mW at 1 A, reducing thermal burden in sealed enclosures. | Use Scenario: Enabling/disabling secondary rails (e.g., 3.3 V, 5 V) in multi-output DC-DC converters. IC Role / Device Role / Timing Role: Precision-controlled enable switch with fast turn-on/turn-off timing (td = 29.1 ns, tf = 18.9 ns). Use Value: 150 MHz fT and sub-100 ns switching times ensure clean rail sequencing without overshoot or delay jitter. |
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 |
|---|---|---|---|
| ZXTN25050DFHTA | VCEO = -50 V, IC = -0.5 A, SOT23-3, hFE = 200 min @ -500 mA | Lower voltage/current rating; suited for lower-power logic-level interfacing | Select when VCEO > -50 V and IC > -0.5 A are not required |
| MMBT5087LT1G | VCEO = -50 V, IC = -0.1 A, SOT23-3, hFE = 150 min @ -10 mA | General-purpose signal transistor; insufficient for >100 mA continuous loads | Use only for biasing, sensing, or low-current switching-not for power switching |
Compared with ZXTN25050DFHTA and MMBT5087LT1G, FMMT591QTA delivers higher voltage blocking (-60 V), greater current capacity (-1 A), and lower saturation resistance-making it uniquely suitable for automotive-grade medium-power switching where robustness and thermal margin are critical.
Availability
FMMT591QTA is available at Aetrix Electronics and suitable for automotive body control modules, industrial relay drivers, LED lighting power stages, and power supply enable switches requiring stable component supply and AEC-Q101 compliance.
Supply support for FMMT591QTA 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 automotive, industrial, and computing markets.
FMMT591QTA belongs to Diodes' AEC-Q101-qualified medium-power transistor product line, engineered specifically for robust high-side switching in automotive body electronics and industrial control systems.
FAQ
What is the maximum allowable collector-emitter voltage for FMMT591QTA?
The absolute maximum VCEO is -60 V at TA = +25°C. This rating applies under open-base conditions and defines the upper limit for safe reverse-biased operation in common-emitter configuration. Exceeding this value risks avalanche breakdown and permanent device failure.
Can FMMT591QTA be used in high-frequency switching applications?
FMMT591QTA has a transition frequency fT of 150 MHz and measured switching times (td = 29.1 ns, tf = 18.9 ns), making it suitable for PWM frequencies up to ~500 kHz in well-designed layouts. It is not intended for RF amplification or GHz-range operation.
Is FMMT591QTA pin-compatible with its complementary NPN type?
Yes - FMMT591QTA (PNP) and FMMT491Q (NPN) share identical SOT23-3 pinout (Emitter-Base-Collector), enabling direct layout reuse in push-pull or H-bridge driver designs where matched thermal and electrical characteristics are required.
Does FMMT591QTA require heatsinking in standard PCB applications?
No external heatsink is required for ≤500 mW power dissipation on a 15 mm × 15 mm 1 oz copper pad. At full -1 A DC load with VCE(SAT) ≈ -295 mV, junction temperature rise is ~74°C above ambient - acceptable within the -55°C to +150°C operating range if ambient stays below +76°C.
FMMT591QTA 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:
- Active
- Transistor Type:
- PNP
- Current - Collector (Ic) (Max):
- 1 A
- Voltage - Collector Emitter Breakdown (Max):
- 60 V
- Vce Saturation (Max) @ Ib, Ic:
- 350mV @ 100mA, 1A
- Current - Collector Cutoff (Max):
- 100nA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 100 @ 500mA, 5V
- Power - Max:
- 500 mW
- Frequency - Transition:
- 150MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
FMMT591QTA FAQ
1.How can I place an order for FMMT591QTA through Aetrix?
Please submit a Request for Quotation (RFQ) for FMMT591QTA 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 FMMT591QTA reliable?
The price and inventory of FMMT591QTA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FMMT591QTA is usually 5 days.
3.What payment methods are accepted for FMMT591QTA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FMMT591QTA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FMMT591QTA?
FMMT591QTA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FMMT591QTA 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 FMMT591QTA?
For technical support, including FMMT591QTA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FMMT591QTA requirements.
6.How does Aetrix verify that FMMT591QTA is sourced from the original manufacturer or authorized distributors?
All FMMT591QTA 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 FMMT591QTA meets industry standards.
7.What is the process for return or replacement of FMMT591QTA?
All FMMT591QTA units undergo pre-shipment inspection (PSI). If there is an issue with FMMT591QTA, 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 FMMT591QTA part is unused and in its original packaging.
Return procedure for FMMT591QTA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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