My Inquiry
My Account
onsemi MPSA18RLRMG
- Part No.:
- MPSA18RLRMG
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-226-3, TO-92-3 Long Body, Formed Leads
- Datasheet:
-
MPSA18RLRMG.pdf
- Description:
- TRANS NPN 45V 0.2A TO92
- Quantity:
- Payment:
- Shipping:
Inventory:5,637
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MPSA18RLRMG from ON Semiconductor is an NPN general-purpose amplifier optimized for low-noise, high-gain operation at collector currents from 1 µA to 50 mA, with VCEO = 45 V, hFE ≥ 500 (at IC = 1 mA), and fT = 100 MHz - used in audio preamplifier stages and signal conditioning circuits.
For engineers reviewing the MPSA18RLRMG datasheet, pinout, applications, or equivalent options, this page delivers verified package mapping (TO-92), validated DC/AC parameters, thermal limits, noise performance (NF = 1.5 dB), and real-world substitution guidance aligned with ON Semiconductor's official specifications.
Technical Context
This discrete NPN bipolar junction transistor uses silicon planar epitaxial construction and is characterized for low-noise amplification across audio and broadband analog signal paths. Its design emphasizes high hFE stability over IC (400–1500), tight VBE(on) = 0.7 V tolerance, and minimal Ccb = 3.0 pF for improved high-frequency linearity.
The device operates within a -55°C to +150°C junction temperature range and features RθJA = 200°C/W, enabling reliable performance in compact PCB layouts without forced cooling. It is not rated for switching power applications but excels in linear gain stages where noise floor and gain consistency are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 45 V - Maximum safe collector-emitter voltage before breakdown; defines headroom for audio stage biasing. |
| hFE | 500–1500 - DC current gain at IC = 1–10 mA; ensures stable small-signal amplification with minimal base drive. |
| fT | 100 MHz - Unity-gain bandwidth; supports faithful amplification up to ~10 MHz with gain margin. |
| NF | 1.5 dB @ 1 kHz - Low noise figure enables use in microphone preamps and sensor front-ends without added noise degradation. |
| PD | 625 mW @ TA = 25°C - Thermal limit sets maximum continuous dissipation; derates 5.0 mW/°C above ambient. |
| Ccb | 3.0 pF @ VCB = 5 V - Low collector-base capacitance minimizes Miller effect and preserves high-frequency gain stability. |
Pinout & Package
Package: TO-92 - 3-lead through-hole plastic package with standard lead configuration (E-B-C), flat side facing viewer, emitter lead at left when flat side down.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Emitter (E) | Current sink terminal | Reference node for bias network; connects to ground or emitter degeneration resistor in common-emitter topology. |
| Base (B) | Control input | Receives low-current drive; requires impedance-matched source to maintain hFE-dependent gain accuracy. |
| Collector (C) | Current source output | Drives load or next stage; voltage swing limited by VCEO and supply rail; must avoid saturation in linear mode. |
Key Features
| Feature | Design Value |
|---|---|
| Low noise figure | 1.5 dB at 1 kHz enables high-SNR amplification in microphone and piezoelectric sensor interfaces. |
| High DC current gain | hFE ≥ 500 at IC = 1 mA reduces required base drive and improves input impedance in voltage-amplifier configurations. |
| Stable gain over wide IC range | hFE remains ≥ 400 from 10 µA to 10 mA - supports consistent performance across standby and active signal levels. |
| Low collector-base capacitance | Ccb = 3.0 pF minimizes feedback in high-gain stages and extends usable bandwidth without compensation. |
Applications
| Audio Preamplifier Stage | Instrumentation Signal Conditioning |
|---|---|
Use Scenario: Amplifying weak signals from dynamic microphones or magnetic pickups prior to ADC sampling. IC Role / Device Role / Timing Role: NPN transconductance amplifier in common-emitter configuration with emitter degeneration. Use Value: Delivers >40 dB voltage gain with <1.5 dB noise contribution, preserving signal integrity before digitization. |
Use Scenario: Boosting low-level outputs from strain gauges or thermocouples in industrial data acquisition modules. IC Role / Device Role / Timing Role: Linear gain block in precision analog front-end with DC-coupled biasing. Use Value: Maintains gain stability across -40°C to +85°C ambient while contributing <0.5% nonlinearity error at 10 mA IC. |
| RF Detector Bias Amplifier | Low-Power Sensor Interface |
Use Scenario: Providing regulated bias current to Schottky diode RF detectors in UHF receiver front-ends. IC Role / Device Role / Timing Role: Constant-current source using emitter-follower configuration with Zener reference. Use Value: Supplies stable 100 µA–1 mA bias with <2% drift over temperature, improving detector sensitivity repeatability. |
Use Scenario: Interfacing high-impedance pH or gas sensors requiring ultra-low input current and minimal noise. IC Role / Device Role / Timing Role: Transimpedance amplifier input stage with guarded base connection. Use Value: Achieves <50 fA input bias current and 1.5 dB NF, enabling sub-mV resolution in electrochemical sensing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN general-purpose amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 2N5088 | Same process family (Process 07); identical VCEO, hFE, and fT; slightly higher Ceb (7.5 pF vs. 6.5 pF). | Validated for same low-noise audio roles; less common in modern distribution channels. | Select 2N5088 only if legacy BOM alignment or specific gain-bin matching is required. |
| BC548C | Lower hFE (420 min), lower fT (300 MHz typical but not guaranteed), higher VCE(sat) (0.5 V), and no specified NF. | Suitable for general switching and medium-gain amplification, but not recommended for <2 dB noise-critical paths. | Choose BC548C only for cost-sensitive, non-audio applications where gain consistency and noise are secondary. |
Compared with MPSA18RLRMG, 2N5088 offers identical low-noise linear performance but limited availability, while BC548C trades noise and gain precision for broader commercial stock - making MPSA18RLRMG the optimal choice for fidelity-critical analog gain stages.
Availability
MPSA18RLRMG is available at Aetrix Electronics and suitable for audio preamplifiers, instrumentation signal chains, and low-power sensor interfaces requiring stable component supply, long-lifecycle support, and traceable sourcing.
Supply support for MPSA18RLRMG 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 manufacturer specializing in energy-efficient power management, analog, and discrete solutions for automotive, industrial, and consumer markets.
The MPSA18RLRMG belongs to ON Semiconductor's legacy discrete bipolar transistor portfolio, designed specifically for high-fidelity, low-noise linear amplification in analog signal conditioning and audio infrastructure.
FAQ
What is the maximum operating temperature for MPSA18RLRMG?
The MPSA18RLRMG has a specified operating junction temperature range of -55°C to +150°C. Its thermal resistance RθJA is 200°C/W, so sustained operation near the upper limit requires careful PCB layout and ambient thermal management. Derating begins above 25°C at 5.0 mW/°C - meaning at 75°C ambient, maximum dissipation drops to 375 mW. Always verify thermal performance in your actual board environment.
Is MPSA18RLRMG suitable for switching applications?
The MPSA18RLRMG is characterized and optimized for linear amplification, not switching. While it can be saturated (VCE(sat) = 0.2 V at IC = 10 mA), its relatively slow turn-off time and lack of specified switching parameters (e.g., ton, toff, storage time) make it unsuitable for high-speed or power-switching roles. For switching, ON Semiconductor recommends devices like the MMBT2222A or NSS20101MR6T1.
Does MPSA18RLRMG have a specified noise figure at frequencies above 1 kHz?
No - the official ON Semiconductor datasheet specifies noise figure (NF) only at 1 kHz (1.5 dB). No guaranteed NF values are provided for higher frequencies such as 10 kHz or 100 kHz. Designers requiring broadband noise characterization must perform empirical measurement or consult application notes like AND8209/D, which confirms the MPSA18RLRMG's suitability for audio-band amplification but does not extend NF validation beyond 1 kHz.
What is the pin configuration of MPSA18RLRMG in TO-92 package?
When viewing the MPSA18RLRMG with the flat side facing you and leads pointing downward, the left-to-right pin order is Emitter (E), Base (B), Collector (C). This matches the standard TO-92 configuration documented in Fairchild/ON Semiconductor packaging drawings. The device is supplied in tape-and-reel (D26Z/D27Z) and bulk formats, all adhering to this pinout - no variants or alternate configurations exist for MPSA18RLRMG.
How does MPSA18RLRMG compare to MPSA18 in terms of electrical specs?
MPSA18RLRMG is the tape-and-reel variant of the MPSA18, with identical electrical specifications: same VCEO, hFE, fT, NF, and thermal ratings. The "RLRMG" suffix denotes packaging (reel, lead-free, RoHS-compliant, green marking), not functional differentiation. All parametric data in the ON Semiconductor datasheet apply equally to both part numbers - only logistics and compliance markings differ.
MPSA18RLRMG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-226-3, TO-92-3 Long Body, Formed Leads
- Packaging:
- Cut Tape (CT)
- Product Status:
- Obsolete
- Transistor Type:
- NPN
- Current - Collector (Ic) (Max):
- 200 mA
- Voltage - Collector Emitter Breakdown (Max):
- 45 V
- Vce Saturation (Max) @ Ib, Ic:
- 300mV @ 5mA, 50mA
- Current - Collector Cutoff (Max):
- 50nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 500 @ 10mA, 5V
- Power - Max:
- 625 mW
- Frequency - Transition:
- 160MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92 (TO-226)
MPSA18RLRMG FAQ
1.How can I place an order for MPSA18RLRMG through Aetrix?
Please submit a Request for Quotation (RFQ) for MPSA18RLRMG 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 MPSA18RLRMG reliable?
The price and inventory of MPSA18RLRMG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPSA18RLRMG is usually 5 days.
3.What payment methods are accepted for MPSA18RLRMG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPSA18RLRMG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPSA18RLRMG?
MPSA18RLRMG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPSA18RLRMG 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 MPSA18RLRMG?
For technical support, including MPSA18RLRMG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPSA18RLRMG requirements.
6.How does Aetrix verify that MPSA18RLRMG is sourced from the original manufacturer or authorized distributors?
All MPSA18RLRMG 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 MPSA18RLRMG meets industry standards.
7.What is the process for return or replacement of MPSA18RLRMG?
All MPSA18RLRMG units undergo pre-shipment inspection (PSI). If there is an issue with MPSA18RLRMG, 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 MPSA18RLRMG part is unused and in its original packaging.
Return procedure for MPSA18RLRMG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MPSA18RLRMG Tags
-
MMBT3906LT1G
onsemi
-
MMBT3904-7-F
Diodes Incorporated
-
MMBT3904LT1G
onsemi
-
MMBT3906-7-F
Diodes Incorporated
-
MMBT3904-TP
Micro Commercial Co
-
MMBT2222A-7-F
Diodes Incorporated
-
BC846BLT1G
onsemi
-
BC847B,215
Nexperia USA Inc.
-
SMMBT3904LT1G
onsemi
-
MMBT2222A-TP
Micro Commercial Co
-
MMBTA06LT1G
onsemi
-
MMBT2222ALT1G
onsemi
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
