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onsemi MMBTA92LT3
- Part No.:
- MMBTA92LT3
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBTA92LT3.pdf
- Description:
- TRANS PNP 300V 0.5A SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:8,812
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Product details
Overview
MMBTA92LT3 from onsemi is a PNP silicon small-signal transistor optimized for high-voltage switching and amplification, with VCEO = −300 V, IC = −500 mA, hFE ≥ 25 at IC = −1.0 mA, and fT = 50 MHz - used in flyback snubber circuits, high-side load switches, and industrial relay drivers.
For engineers reviewing the MMBTA92LT3 datasheet, pinout, applications, or equivalent options, key selection criteria include verified −300 V breakdown rating, SOT-23 thermal derating behavior (1.8 mW/°C on FR-5), low Ccb = 6.0 pF, and confirmed base-emitter saturation voltage of −0.9 V at IC/IB = 10.
Technical Context
This PNP transistor operates in active, saturation, and cutoff regions with guaranteed V(BR)CEO = −300 V and V(BR)CBO = −300 V under specified test conditions. Its DC current gain hFE is specified across three collector current points (−1 mA, −10 mA, −30 mA) with minimum values of 25, 40, and 25 respectively.
Small-signal performance includes fT = 50 MHz at IC = −10 mA, VCE = −20 V, and Ccb = 6.0 pF at VCB = −20 V - confirming suitability for medium-frequency switching and analog amplification up to ~20 MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | −300 V - supports high-voltage off-state blocking in flyback, snubber, and HV bias networks |
| IC (max) | −500 mA - enables direct drive of moderate-current loads without external buffering |
| hFE (min) | 25 at IC = −1 mA - ensures reliable base-driven switching at low-current control stages |
| fT | 50 MHz - validates use in medium-speed switching (e.g., <5 MHz PWM) and RF preamp stages |
| Ccb | 6.0 pF - limits Miller feedback in high-gain amplifier configurations |
| VCE(sat) | −0.5 V at IC = −20 mA, IB = −2 mA - reduces conduction loss in saturated-switch applications |
| RJA (FR-5) | 556 °C/W - defines thermal rise per mW dissipation on standard PCB; requires layout-aware heatsinking above 100 mW |
Pinout & Package
MMBTA92LT3 is housed in a Pb-free SOT-23 (TO-236AF) package (Case 318, Style 6), with standardized 3-pin configuration and JEDEC-compliant footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base | Control input node; requires current-limited drive to ensure safe IB ≤ −2 mA for full saturation |
| 2 | Emitter | Common reference terminal; connected to higher potential rail in PNP high-side switch topology |
| 3 | Collector | Output/current sink node; handles up to −500 mA continuous and −300 V reverse bias |
Key Features
| Feature | Design Value |
|---|---|
| High-voltage PNP structure | Guaranteed −300 V VCEO and VCBO enable direct replacement of older high-voltage transistors like MPSA92 in legacy designs |
| Pb-free SOT-23 packaging | RoHS-compliant construction with validated reflow profile compatibility per ON Semiconductor SOLDERINGRM/D |
| Low Ccb capacitance | 6.0 pF minimizes unwanted coupling in high-gain amplifier stages and improves switching edge fidelity |
| Wide temperature operation | Specified from −55°C to +150°C junction temperature - suitable for under-hood automotive and industrial ambient environments |
Applications
| Industrial Relay Drivers | Flyback Converter Snubbers |
|---|---|
Use Scenario: Driving 24–48 VDC industrial relays with coil currents up to 400 mA in PLC output modules. IC Role / Device Role / Timing Role: High-side PNP switch controlling relay coil return path to ground. Use Value: −300 V VCEO withstands inductive kickback spikes exceeding 200 V without clamping diodes. | Use Scenario: Absorbing leakage energy in offline flyback power supplies operating at 65–100 kHz. IC Role / Device Role / Timing Role: Fast-switching PNP clamp transistor in RCD snubber network. Use Value: 50 MHz fT and 6.0 pF Ccb support clean turn-off with minimal ringing during transient suppression. |
| High-Voltage Bias Networks | Legacy Circuit Upgrades |
Use Scenario: Providing stable bias current to HV op-amp input stages or photomultiplier tube anode dividers. IC Role / Device Role / Timing Role: Constant-current source configured in emitter-follower topology. Use Value: hFE ≥ 25 at −1 mA ensures predictable current regulation across −40°C to +85°C. | Use Scenario: Drop-in upgrade for obsolete MPSA92 and 2N5401 in existing production boards. IC Role / Device Role / Timing Role: Direct functional replacement in through-hole-to-SMT migration paths. Use Value: Identical VCEO, VCBO, and hFE specs with SOT-23 footprint enabling board-level redesign avoidance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage PNP transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPSA92 | Through-hole TO-92 package; identical VCEO = −300 V, hFE = 25–250, but higher RJA ≈ 200°C/W | Requires PCB redesign for SMT assembly; not suitable for space-constrained layouts | Select when legacy through-hole manufacturing or manual prototyping is required |
| MMBT3906LT1G | Lower VCEO = −40 V; hFE = 100 min at −10 mA; same SOT-23 package | Not usable in >−60 V circuits; limited to low-voltage logic-level switching | Select only for cost-sensitive, low-voltage bias or digital inversion where −300 V rating is unnecessary |
Compared with MPSA92 and MMBT3906LT1G, the MMBTA92LT3 uniquely balances high-voltage capability (−300 V), SMT compatibility, and thermal performance on FR-5 - making it the only option among the three qualified for compact, high-reliability industrial snubber and relay driver designs.
Availability
MMBTA92LT3 is available at Aetrix Electronics and suitable for industrial relay drivers, flyback snubbers, high-voltage bias networks, and legacy circuit upgrades requiring stable component supply and long-term obsolescence management.
Supply support for MMBTA92LT3 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
onsemi (formerly ON Semiconductor) is a global semiconductor supplier focused on energy-efficient innovation for automotive, industrial, cloud, and IoT applications.
The MMBTA92LT3 belongs to onsemi's high-voltage bipolar transistor product line, engineered specifically for robust switching and amplification in harsh-voltage environments where reliability and parametric consistency are critical.
FAQ
What is the maximum collector-emitter voltage rating for MMBTA92LT3?
The MMBTA92LT3 has a guaranteed VCEO rating of −300 Vdc at IC = −1.0 mAdc and TA = 25°C. This rating is validated per onsemi's published datasheet Rev. 5 and applies to continuous DC operation - confirming its suitability for high-voltage snubber and relay drive applications where transient spikes exceed 200 V. The MMBTA92LT3 must not be operated beyond this limit without external clamping.
Is MMBTA92LT3 RoHS-compliant and lead-free?
Yes, the MMBTA92LT3 is manufactured in a Pb-free SOT-23 package per onsemi's stated compliance policy and is marked "LT3" to indicate lead-free construction. It meets JEDEC J-STD-020 moisture sensitivity level 1 and is qualified for standard reflow profiles outlined in the ON Semiconductor Soldering and Mounting Techniques Reference Manual. The MMBTA92LT3 does not contain lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE.
What is the thermal resistance of MMBTA92LT3 on a standard FR-5 PCB?
The MMBTA92LT3 exhibits a thermal resistance RJA of 556°C/W when mounted on an FR-5 board (1.0 × 0.75 × 0.062 in.) at TA = 25°C. Its power dissipation must be derated by 1.8 mW/°C above 25°C ambient - meaning maximum continuous PD drops to ~135 mW at 85°C ambient. This value is measured per Note 1 in the official datasheet and directly impacts layout decisions for heat-spreading copper.
Can MMBTA92LT3 replace MPSA92 in existing designs?
Yes, the MMBTA92LT3 provides functionally equivalent electrical parameters (VCEO, VCBO, hFE, VCE(sat)) to the through-hole MPSA92 but in an SOT-23 package. While not pin-compatible due to differing footprints, it serves as a validated drop-in functional replacement when board layout allows SMT conversion. The MMBTA92LT3 retains identical high-voltage performance while improving thermal response and assembly scalability.
What is the typical transition frequency (fT) of MMBTA92LT3 and how is it measured?
The MMBTA92LT3 has a minimum fT of 50 MHz, measured under controlled conditions: IC = −10 mAdc, VCE = −20 Vdc, and f = 100 MHz. This parameter reflects its small-signal current gain bandwidth and confirms usability in medium-frequency switching (e.g., 1–5 MHz PWM) and analog amplification stages. The MMBTA92LT3's fT remains stable across its rated temperature range and is unaffected by Pb-free packaging.
MMBTA92LT3 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:
- PNP
- Current - Collector (Ic) (Max):
- 500 mA
- Voltage - Collector Emitter Breakdown (Max):
- 300 V
- Vce Saturation (Max) @ Ib, Ic:
- 500mV @ 2mA, 20mA
- Current - Collector Cutoff (Max):
- 250nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 25 @ 30mA, 10V
- Power - Max:
- 300 mW
- Frequency - Transition:
- 50MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3 (TO-236)
MMBTA92LT3 FAQ
1.How can I place an order for MMBTA92LT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBTA92LT3 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 MMBTA92LT3 reliable?
The price and inventory of MMBTA92LT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBTA92LT3 is usually 5 days.
3.What payment methods are accepted for MMBTA92LT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBTA92LT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBTA92LT3?
MMBTA92LT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBTA92LT3 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 MMBTA92LT3?
For technical support, including MMBTA92LT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBTA92LT3 requirements.
6.How does Aetrix verify that MMBTA92LT3 is sourced from the original manufacturer or authorized distributors?
All MMBTA92LT3 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 MMBTA92LT3 meets industry standards.
7.What is the process for return or replacement of MMBTA92LT3?
All MMBTA92LT3 units undergo pre-shipment inspection (PSI). If there is an issue with MMBTA92LT3, 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 MMBTA92LT3 part is unused and in its original packaging.
Return procedure for MMBTA92LT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMBTA92LT3 Tags
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