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onsemi MMBTA14_D87Z
- Part No.:
- MMBTA14_D87Z
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBTA14_D87Z.pdf
- Description:
- TRANS NPN DARL 30V 1.2A SOT-23-3
- Quantity:
- Payment:
- Shipping:
Inventory:5,941
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Product details
Overview
MMBTA14_D87Z from ON Semiconductor is an NPN silicon Darlington amplifier transistor in SOT-23 package, rated for 30 VCE, 300 mAC, and DC current gain up to 20,000 at 100 mA. It delivers low saturation voltage (VCE(sat) ≤ 1.5 V) and high noise immunity, commonly used in low-power relay drivers and signal amplification stages.
For engineers reviewing the MMBTA14_D87Z datasheet, pinout, applications, or equivalent options, key selection criteria include verified Darlington gain structure, thermal derating on FR-5 board, SOT-23 footprint compatibility, and noise performance at 10–100 µA bias currents.
Technical Context
This device implements a monolithic two-stage NPN Darlington configuration with integrated base-emitter resistor network absent - requiring external base drive control. Its high hFE (10,000–20,000) enables microampere-level input current to switch 100+ mA loads, while fT = 125 MHz supports stable operation beyond audio frequencies.
Thermal design relies on validated RθJA = 556 °C/W on FR-5 and 417 °C/W on alumina substrate, with junction temperature range –55°C to +150°C. The SOT-23 package uses standardized Style 6 pinout (Pin 1: Base, Pin 2: Emitter, Pin 3: Collector), confirmed per CASE 318–08 mechanical drawing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 30 V - Maximum safe collector-emitter voltage before breakdown under open-base condition |
| IC Continuous | 300 mA - Absolute maximum DC collector current without thermal runaway on standard PCB |
| hFE @ 100 mA | 10,000–20,000 - Confirmed Darlington DC gain enabling single-stage current amplification from µA to 100+ mA |
| VCE(sat) | ≤1.5 V - Verified saturation voltage ensures <150 mW power loss at 100 mA load, critical for low-drop switching |
| fT | 125 MHz - Measured transition frequency confirms usable bandwidth for fast-switching and RF-coupled preamp stages |
| RθJA | 556 °C/W - Thermal resistance value tied to JEDEC-standard FR-5 board layout; dictates 225 mW max dissipation at 25°C ambient |
Pinout & Package
SOT-23 (TO-236AB) surface-mount package per CASE 318–08, Style 6; dimensions: 2.0 × 0.95 × 0.9 mm (L × W × H); 3-pin configuration with gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Base | Control input node; requires current-limited drive due to Darlington base-emitter cascade |
| Pin 2 | Emitter | Common emitter reference; connects to ground or low-side return path in switching applications |
| Pin 3 | Collector | High-current output node; sinks up to 300 mA with VCE ≤ 1.5 V when fully saturated |
Key Features
| Feature | Design Value |
|---|---|
| Darlington architecture | Monolithic NPN pair delivering >10 k hFE without external components, reducing BOM count in driver circuits |
| Low VCE(sat) | ≤1.5 V at IC/IB = 1000 ensures minimal conduction loss in battery-powered relay interfaces |
| High fT | 125 MHz enables use in wideband preamplifiers and pulse-shaping networks up to 10 MHz |
| Wide TJ range | –55°C to +150°C operation supports deployment in automotive cabin modules and industrial sensor nodes |
Applications
| Relay Driver Circuit | Low-Noise Preamp Stage |
|---|---|
Use Scenario: Driving 5 V/100 mA electromagnetic relays from MCU GPIO pins with 1 mA available drive current. IC Role / Device Role / Timing Role: High-gain current amplifier converting logic-level signals into sufficient coil current without external transistors. Use Value: Eliminates need for dual-transistor discrete Darlington stage, saving PCB area and improving reliability over discrete alternatives. | Use Scenario: Amplifying weak thermocouple or photodiode signals in portable instrumentation with <100 nV/√Hz noise floor requirement. IC Role / Device Role / Timing Role: Low-noise, high-input-impedance active stage preceding ADC input, operating at 10–100 µA collector bias. Use Value: Delivers measured en ≈ 1–2 nV/√Hz at 1 kHz (per Fig. 2), outperforming standard small-signal BJTs in ultra-low-level analog front-ends. |
| LED Current Regulator | Industrial Sensor Interface |
Use Scenario: Constant-current LED driver for status indicators in PLC I/O modules where supply varies between 12–24 V. IC Role / Device Role / Timing Role: Linear current sink controlled by precision shunt resistor and op-amp feedback loop. Use Value: Maintains ±2% current regulation across temperature due to predictable VBE tracking and low thermal resistance (RθJA = 556 °C/W). | Use Scenario: Signal conditioning for 4–20 mA current-loop sensors in factory automation panels exposed to 85°C ambient. IC Role / Device Role / Timing Role: Temperature-stable active load and level-shifting element interfacing field transmitters to isolated ADCs. Use Value: Guaranteed operation up to +150°C junction temperature allows direct mounting near heat-generating power electronics without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Darlington amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBTA13LT1 | Lower hFE (5,000–10,000), identical VCEO/IC/package | Suitable where gain margin >5k suffices; lower noise at high-frequency bias points | Select MMBTA13LT1 when circuit tolerates reduced current gain and benefits from slightly better fT stability above 50 MHz |
| ZTX1048A | Higher VCEO (60 V), TO-92 package, hFE = 10k–25k, RθJA ≈ 200 °C/W | Enables higher-voltage relay driving but requires through-hole assembly and larger board area | Choose ZTX1048A only when 60 V rating is mandatory and SMT constraints are relaxed |
Compared with MMBTA14_D87Z, MMBTA13LT1 offers lower gain but tighter high-frequency response, while ZTX1048A trades SMT compatibility for higher voltage headroom and thermal performance - neither is pin-compatible, requiring layout revision for substitution.
Availability
MMBTA14_D87Z is available at Aetrix Electronics and suitable for relay driver circuits, low-noise preamplifiers, and industrial sensor interfaces requiring stable component supply across automotive, industrial control, and test equipment programs.
Supply support for MMBTA14_D87Z 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
ON Semiconductor is a global semiconductor supplier specializing in power management, analog, sensors, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.
The MMBTA14_D87Z belongs to ON Semiconductor's general-purpose bipolar transistor product line, designed specifically for space-constrained, high-gain linear and switching applications in cost-sensitive industrial and consumer systems.
FAQ
What is the maximum continuous collector current for MMBTA14_D87Z?
The MMBTA14_D87Z supports a maximum continuous collector current of 300 mA at TA = 25°C on FR-5 board. Derating applies above 25°C at 1.8 mW/°C, limiting usable current in high-ambient environments unless heatsinking or substrate upgrades (e.g., alumina) are implemented. This rating is validated per the manufacturer's thermal test conditions in the datasheet.
Does MMBTA14_D87Z have built-in base resistors?
No, the MMBTA14_D87Z is a bare Darlington transistor without integrated base resistors. External base current limiting is required to prevent damage during turn-on; typical designs use a series resistor sized to deliver ~100 µA–1 mA depending on load current and desired saturation level. This differs from digital transistors like the NSBC114, which integrate bias resistors.
What is the guaranteed minimum DC current gain (hFE) for MMBTA14_D87Z at 100 mA collector current?
The guaranteed minimum hFE for MMBTA14_D87Z is 10,000 at IC = 100 mA and VCE = 5.0 V, per the Electrical Characteristics table. This value is tested and binned - actual units often exceed 15,000, but design margins must be based on the 10k minimum to ensure robustness across process variation and temperature.
Can MMBTA14_D87Z be used in linear amplifier configurations?
Yes, MMBTA14_D87Z is characterized for linear operation with documented noise voltage (en), noise current (in), and fT = 125 MHz. Its low 1/f noise corner and stable hFE vs. IC (Fig. 8) support Class-A preamplifier use, though thermal limits require careful biasing to stay within 225 mW dissipation on standard PCBs.
What is the correct pinout orientation for MMBTA14_D87Z in SOT-23 package?
The MMBTA14_D87Z uses Style 6 pinout per CASE 318–08: Pin 1 = Base, Pin 2 = Emitter, Pin 3 = Collector. This matches the marking "1N" on the top surface and is consistent across ON Semiconductor's MMBTA13/14 family. Misorientation causes immediate functional failure in switching applications due to reversed emitter-collector polarity.
MMBTA14_D87Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Transistor Type:
- NPN - Darlington
- Current - Collector (Ic) (Max):
- 1.2 A
- 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:
- 350 mW
- Frequency - Transition:
- 125MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
MMBTA14_D87Z FAQ
1.How can I place an order for MMBTA14_D87Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBTA14_D87Z 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_D87Z reliable?
The price and inventory of MMBTA14_D87Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBTA14_D87Z is usually 5 days.
3.What payment methods are accepted for MMBTA14_D87Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBTA14_D87Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBTA14_D87Z?
MMBTA14_D87Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBTA14_D87Z 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_D87Z?
For technical support, including MMBTA14_D87Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBTA14_D87Z requirements.
6.How does Aetrix verify that MMBTA14_D87Z is sourced from the original manufacturer or authorized distributors?
All MMBTA14_D87Z 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_D87Z meets industry standards.
7.What is the process for return or replacement of MMBTA14_D87Z?
All MMBTA14_D87Z units undergo pre-shipment inspection (PSI). If there is an issue with MMBTA14_D87Z, 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_D87Z part is unused and in its original packaging.
Return procedure for MMBTA14_D87Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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