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onsemi BSR17A_D87Z
- Part No.:
- BSR17A_D87Z
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BSR17A_D87Z.pdf
- Description:
- TRANS NPN 40V 0.2A SOT-23-3
- Quantity:
- Payment:
- Shipping:
Inventory:6,996
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Product details
Overview
BSR17A_D87Z from ON Semiconductor is an NPN general-purpose bipolar junction transistor (BJT) designed for amplification and switching in low-power analog and digital circuits. It delivers DC current gain (hFE) of 40–300 across 0.1–100 mA collector current, supports 40 V VCEO and 60 V VCBO, and operates up to 300 MHz transition frequency (fT), making it suitable for signal conditioning in consumer audio preamps and logic-level interface circuits.
For engineers reviewing the BSR17A_D87Z datasheet, pinout, applications, or equivalent options, key selection criteria include its SOT-23 package footprint, guaranteed hFE range at multiple bias points, VCE(sat) ≤ 0.3 V at IC = 50 mA/IB = 5 mA, and thermal resistance of 357 °C/W on FR-4 PCB - all critical for space-constrained, thermally sensitive designs.
Technical Context
This device belongs to Fairchild's legacy Process 23 silicon platform, optimized for high-frequency small-signal performance and fast switching. Its fT of 300 MHz at IC = 20 mA/VCE = 20 V and low capacitances (Ccb = 4.0 pF, Ceb = 8.0 pF) support stable operation in RF amplifier stages and pulse-shaping circuits up to ~100 MHz.
The BSR17A_D87Z exhibits well-characterized saturation behavior with VCE(sat) = 0.2 V (IC = 10 mA/IB = 1 mA) and VBE(sat) = 0.65–0.95 V across operating current, enabling predictable drive requirements in discrete logic buffers and LED driver switches.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 40 V - Maximum safe collector-emitter voltage before breakdown; defines headroom for 3.3 V/5 V rail applications. |
| hFE | 40–300 - DC current gain range across IC = 0.1–100 mA; enables consistent biasing in amplifier and switch configurations. |
| fT | 300 MHz - Transition frequency at IC = 20 mA/VCE = 20 V; confirms suitability for VHF small-signal amplification. |
| VCE(sat) | 0.2–0.3 V - Low saturation voltage ensures minimal power loss and heat generation when used as a saturated switch. |
| RθJA | 357 °C/W - Junction-to-ambient thermal resistance on standard FR-4 PCB; informs derating for continuous 200 mA operation. |
| Ccb | 4.0 pF - Collector-base capacitance at VCB = 0.5 V; contributes to Miller effect limits in high-gain amplifier stages. |
Pinout & Package
BSR17A_D87Z is housed in a surface-mount SOT-23 package (JEDEC TO-236AB), with standardized three-terminal configuration and thermal pad omitted. The package measures 2.9 mm × 1.3 mm × 1.0 mm and supports reflow soldering per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | Current sink terminal | Reference node for base drive; connects to ground or low-impedance return path in common-emitter configurations. |
| 2 (Base) | Control input | Accepts current-limited bias to set operating point; requires series resistor to limit IB and prevent thermal runaway. |
| 3 (Collector) | Current source terminal | Drives load toward supply rail; voltage swing limited by VCEO rating and saturation characteristics. |
Key Features
| Feature | Design Value |
|---|---|
| High fT bandwidth | 300 MHz transition frequency enables use in VHF amplifiers and fast-switching digital interfaces without external compensation. |
| Guaranteed hFE spread | Specified min/max hFE across five collector current levels ensures predictable gain stability in production-batched amplifier designs. |
| Low VCE(sat) | 0.2 V typical at IC = 10 mA/IB = 1 mA reduces conduction loss and self-heating in battery-powered switch applications. |
| SOT-23 footprint compatibility | Standardized 3-pin SOT-23 outline allows drop-in replacement with other general-purpose BJTs like MMBT3904 or PN2222A variants. |
Applications
| Audio Pre-amplifier Stage | Logic-Level Translator |
|---|---|
Use Scenario: Amplifying weak microphone or sensor signals in portable audio devices before ADC sampling. IC Role / Device Role / Timing Role: NPN small-signal amplifier in common-emitter configuration with emitter degeneration. Use Value: 300 MHz fT and 100–400 hfe ensure wideband gain flatness and low distortion at audio frequencies with minimal external components. |
Use Scenario: Converting 1.8 V CMOS logic outputs to 3.3 V or 5 V TTL-compatible levels in mixed-voltage microcontroller systems. IC Role / Device Role / Timing Role: Discrete level-shifting switch with fixed base bias and collector pull-up. Use Value: Low VCE(sat) ≤ 0.3 V and fast switching (td = 35 ns, tf = 50 ns) maintain signal integrity and timing margins across voltage domains. |
| LED Driver Switch | Current Mirror Reference |
Use Scenario: Driving indicator LEDs or low-current status lights from GPIO pins in industrial HMI panels. IC Role / Device Role / Timing Role: Saturated NPN switch controlling LED anode/cathode current path. Use Value: 200 mA IC rating and 0.2 V VCE(sat) allow direct GPIO drive of up to 20 mA LEDs with <10 mW dissipation per switch. |
Use Scenario: Providing matched reference current in analog sensor signal conditioning circuits requiring temperature-stable bias. IC Role / Device Role / Timing Role: Active component in two-transistor current mirror topology with emitter resistors. Use Value: Tight hFE consistency across batches and low ICBO (5.0 µA at 150°C) minimize mirror ratio error and thermal drift over operating temperature. |
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 |
|---|---|---|---|
| MMBT3904LT1G | Higher hFE min (100 vs. 40), lower fT (300 MHz same), tighter VCE(sat) spec (0.2 V max at IC = 10 mA). | Better suited for low-noise preamp stages where gain consistency matters more than absolute max current. | Select when higher minimum hFE and tighter parametric control are required; same SOT-23 footprint. |
| PN2222A | TO-92 through-hole package, higher PD (625 mW), lower fT (300 MHz nominal but not characterized at same conditions). | Preferred for prototyping, manual assembly, or higher-power linear regulation where thermal mass aids dissipation. | Choose for breadboard evaluation or legacy through-hole designs; not a drop-in replacement due to package mismatch. |
Compared with MMBT3904LT1G and PN2222A, the BSR17A_D87Z offers balanced fT/hFE trade-off and verified SOT-23 thermal performance on FR-4, making it optimal for volume-manufactured compact PCBs needing reliable switching and mid-band amplification without redesign.
Availability
BSR17A_D87Z is available at Aetrix Electronics and suitable for consumer audio preamplifiers, industrial logic-level translators, and LED driver circuits requiring stable component supply and long-term manufacturability.
Supply support for BSR17A_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 manufacturer specializing in energy-efficient power management, analog, sensing, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.
The BSR17A_D87Z originates from Fairchild's general-purpose transistor product line, designed for cost-sensitive, high-volume applications demanding proven reliability, consistent parametric distribution, and broad design flexibility across analog and digital functions.
FAQ
What is the maximum continuous collector current for BSR17A_D87Z?
The BSR17A_D87Z has a rated DC collector current (IC) of 200 mA under steady-state conditions at Ta = 25°C. Derating applies above 25°C per the 2.8 mW/°C thermal coefficient, and actual usable current depends on PCB layout, ambient temperature, and duty cycle. For sustained 200 mA operation, thermal design must maintain junction temperature below 150°C. The BSR17A_D87Z datasheet specifies this limit in its Absolute Maximum Ratings table.
Does BSR17A_D87Z support high-frequency amplifier applications?
Yes - the BSR17A_D87Z achieves a transition frequency (fT) of 300 MHz at IC = 20 mA and VCE = 20 V, confirming usability in VHF small-signal amplifiers up to ~100 MHz. Its low capacitances (Ccb = 4.0 pF, Ceb = 8.0 pF) and stable hfe (100–400 at 1 kHz) support broadband gain with minimal peaking. The BSR17A_D87Z is commonly deployed in RF front-end buffering and IF amplification where discrete gain blocks are preferred.
What is the pin configuration of BSR17A_D87Z in SOT-23?
The BSR17A_D87Z uses standard SOT-23 pinout: Pin 1 = Emitter, Pin 2 = Base, Pin 3 = Collector - viewed from top with marking dot at top-left corner. This matches JEDEC TO-236AB orientation and is identical to MMBT3904 and PN2222A SOT-23 variants. The BSR17A_D87Z marking "U92" appears adjacent to Pin 1. No alternate pinouts or package variants exist for this part number.
How does BSR17A_D87Z compare to MMBT3904 in switching performance?
The BSR17A_D87Z and MMBT3904 share similar VCE(sat) (≤0.3 V) and switching times (td ≈ 35 ns, tf ≈ 50 ns), but the BSR17A_D87Z specifies hFE down to IC = 0.1 mA - giving better low-current gain predictability in partial-turn-on states. The BSR17A_D87Z also features tighter Ccb/Ceb matching across lots, improving consistency in high-speed digital buffer designs. Both are valid for BSR17A_D87Z-class switching roles.
Is BSR17A_D87Z suitable for automotive applications?
The BSR17A_D87Z is not AEC-Q101 qualified and lacks automotive-grade screening or extended temperature validation beyond its specified -55°C to +150°C storage/junction range. While its absolute ratings meet some under-hood thermal requirements, ON Semiconductor does not endorse or guarantee BSR17A_D87Z for automotive safety-critical or mission-critical systems. For such use, qualified alternatives like NSS40201MR6T1G should be selected instead of BSR17A_D87Z.
BSR17A_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
- Current - Collector (Ic) (Max):
- 200 mA
- Voltage - Collector Emitter Breakdown (Max):
- 40 V
- Vce Saturation (Max) @ Ib, Ic:
- 300mV @ 5mA, 50mA
- Current - Collector Cutoff (Max):
- 5µA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 100 @ 10mA, 1V
- Power - Max:
- 350 mW
- Frequency - Transition:
- 300MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
BSR17A_D87Z FAQ
1.How can I place an order for BSR17A_D87Z through Aetrix?
Please submit a Request for Quotation (RFQ) for BSR17A_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 BSR17A_D87Z reliable?
The price and inventory of BSR17A_D87Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BSR17A_D87Z is usually 5 days.
3.What payment methods are accepted for BSR17A_D87Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BSR17A_D87Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BSR17A_D87Z?
BSR17A_D87Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BSR17A_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 BSR17A_D87Z?
For technical support, including BSR17A_D87Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BSR17A_D87Z requirements.
6.How does Aetrix verify that BSR17A_D87Z is sourced from the original manufacturer or authorized distributors?
All BSR17A_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 BSR17A_D87Z meets industry standards.
7.What is the process for return or replacement of BSR17A_D87Z?
All BSR17A_D87Z units undergo pre-shipment inspection (PSI). If there is an issue with BSR17A_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 BSR17A_D87Z part is unused and in its original packaging.
Return procedure for BSR17A_D87Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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