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Home > Products > Discrete Semiconductor Products > Transistors > Bipolar (BJT) > Single Bipolar Transistors

Renesas 2SA1122CDTL-E

Name: 2SA1122CDTL-E
Brand: Renesas
SKU: 2SA1122CDTL-E
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 2SA1122CDTL-E

Manufacturer:: Renesas

Category:: Single Bipolar Transistors

Package:: SC-70, SOT-323

Datasheet:: 2SA1122CDTL-E.pdf

Description:: TRANS PNP 55V 0.1A 3-CMPAK

Quantity:: RFQ Add To RFQ list

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Product details

Overview

2SA1122CDTL-E from Renesas Electronics is a silicon PNP epitaxial transistor in MPAK (SC-59A) package, rated for –55 V V_CEO, –100 mA I_C, and 150 mW P_C, with h_FE of 250–500 (Grade D), used in low-frequency amplifier stages of consumer audio and signal conditioning circuits.

For engineers reviewing the 2SA1122CDTL-E datasheet, 2SA1122CDTL-E pinout, 2SA1122CDTL-E application, or 2SA1122CDTL-E equivalent, key selection criteria include guaranteed h_FE range, V_CEO/V_CBO breakdown ratings, thermal derating curve compliance, and SC-59A footprint compatibility in discrete bias networks.

Technical Context

This PNP bipolar junction transistor operates in linear amplification mode with fixed-base biasing or emitter-follower configurations. Its V_CE(sat) ≤ –0.5 V at I_C = –10 mA / I_B = –1 mA ensures low-loss switching in driver stages, while V_BE ≤ –0.75 V at I_C = –2 mA supports predictable base drive requirements.

The device exhibits Cob ≤ 50 pF at V_CB = –10 V (f = 1 MHz), limiting high-frequency gain roll-off, and maintains h_FE ≥ 250 up to I_C = –10 mA, enabling stable small-signal gain in preamplifier topologies where DC bias stability is critical.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	–55 V - supports rail-to-rail operation in ±30 V analog supply systems without breakdown
I_C	–100 mA - sufficient for driving low-power speaker outputs or relay coils in discrete logic interfaces
P_C	150 mW - requires heatsinking above ~60 mW dissipation in ambient >50°C per derating curve
h_FE	250–500 (Grade D) - enables consistent current gain across production lots in amplifier feedback loops
V_CE(sat)	≤ –0.5 V - minimizes voltage drop and power loss in saturated switch applications
T_j	150°C - allows operation in enclosed industrial enclosures with limited airflow

Pinout & Package

Package: MPAK (SC-59A), 3-pin surface-mount plastic package with gull-wing leads, JEITA code PLSP0003ZB-A, mass 0.011 g, footprint compatible with standard SC-59 pick-and-place tooling.

Pin/Terminal	Circuit Role	Design Meaning
1	Emitter	Current sink node; connects to most negative potential in PNP amplifier stage
2	Base	Control input; requires current-limited drive to avoid exceeding I_B = –1 mA max
3	Collector	Output node; ties to load or next-stage input; reverse-biased under normal operation

Key Features

Feature	Design Value
Guaranteed h_FE grade	250–500 (D-grade marking "CD") - eliminates binning during assembly for consistent gain matching
Low V_CE(sat)	≤ –0.5 V at rated I_C/I_B - reduces conduction loss in Class-A amplifier output stages
High V_CEO rating	–55 V - enables use in higher-voltage analog rails without cascading transistors
Thermal robustness	T_j = 150°C with defined derating curve - supports operation in sealed consumer enclosures
JEDEC-compliant footprint	SC-59A (MPAK) - ensures compatibility with automated SMT placement and reflow profiles

Applications

Audio Preamp Stage	Signal Level Shifter
Use Scenario: Amplifying microphone-level signals (–10 dBV to +4 dBu) before ADC input in portable audio recorders. IC Role / Device Role / Timing Role: Discrete PNP common-emitter amplifier providing 20–30 dB voltage gain with DC-coupled bias network. Use Value: Grade D h_FE ensures minimal unit-to-unit gain variation across production batches, reducing post-assembly calibration.	Use Scenario: Translating TTL logic levels (0/5 V) to –5 V/0 V for interfacing with legacy analog comparators. IC Role / Device Role / Timing Role: Inverting level translator operating in saturation/cutoff, driven by microcontroller GPIO. Use Value: V_CE(sat) ≤ –0.5 V guarantees reliable low-state voltage margin for downstream comparator hysteresis thresholds.
DC Bias Generator	Low-Power Relay Driver
Use Scenario: Providing stable bias current to op-amp input stages in battery-powered sensor front-ends. IC Role / Device Role / Timing Role: Emitter-follower configured as precision current source with resistive base bias. Use Value: Tight h_FE spread (250–500) enables accurate current mirroring without trimming resistors.	Use Scenario: Driving 50 mA coil current in miniature SPST relays used in HVAC control panels. IC Role / Device Role / Timing Role: Switch-mode PNP driver with base resistor network controlling saturation depth. Use Value: 150 mW P_C rating and –55 V V_CEO allow direct connection to 24 V DC control rails with safety margin.

Audio Preamp Stage

Signal Level Shifter

Use Scenario: Amplifying microphone-level signals (–10 dBV to +4 dBu) before ADC input in portable audio recorders.

IC Role / Device Role / Timing Role: Discrete PNP common-emitter amplifier providing 20–30 dB voltage gain with DC-coupled bias network.

Use Value: Grade D h_FE ensures minimal unit-to-unit gain variation across production batches, reducing post-assembly calibration.

Use Scenario: Translating TTL logic levels (0/5 V) to –5 V/0 V for interfacing with legacy analog comparators.

IC Role / Device Role / Timing Role: Inverting level translator operating in saturation/cutoff, driven by microcontroller GPIO.

Use Value: V_CE(sat) ≤ –0.5 V guarantees reliable low-state voltage margin for downstream comparator hysteresis thresholds.

DC Bias Generator

Low-Power Relay Driver

Use Scenario: Providing stable bias current to op-amp input stages in battery-powered sensor front-ends.

IC Role / Device Role / Timing Role: Emitter-follower configured as precision current source with resistive base bias.

Use Value: Tight h_FE spread (250–500) enables accurate current mirroring without trimming resistors.

Use Scenario: Driving 50 mA coil current in miniature SPST relays used in HVAC control panels.

IC Role / Device Role / Timing Role: Switch-mode PNP driver with base resistor network controlling saturation depth.

Use Value: 150 mW P_C rating and –55 V V_CEO allow direct connection to 24 V DC control rails with safety margin.

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP low-frequency amplifier applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
2SA1037AK-TE12L	h_FE = 120–270 (lower gain range), V_CEO = –50 V, same SC-59A package	Suitable for cost-sensitive designs where gain tolerance >±20% is acceptable	Select when lower gain and reduced voltage margin are acceptable trade-offs for extended availability
BC807-40/DG	h_FE = 250–630 (wider spread), V_CEO = –45 V, SOT-23 package (smaller footprint)	Requires PCB redesign due to different pad layout; better suited for space-constrained layouts	Choose only if board real estate is constrained and SOT-23 reflow profile is already qualified

Compared with 2SA1122CDTL-E, the 2SA1037AK-TE12L offers lower cost but reduced voltage headroom and gain consistency, while the BC807-40/DG provides higher maximum h_FE at the expense of tighter layout constraints and lower breakdown rating.

Availability

2SA1122CDTL-E is available at Aetrix Electronics and suitable for low-frequency amplifier, signal level shifting, and DC bias generation applications requiring stable component supply and consistent h_FE grading.

Supply support for 2SA1122CDTL-E 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

Renesas Electronics Corporation is a Japanese semiconductor manufacturer specializing in microcontrollers, analog, and discrete power devices, with global design and manufacturing infrastructure.

The 2SA1122CDTL-E belongs to Renesas' legacy silicon bipolar transistor product line, designed specifically for cost-effective, reliable low-frequency analog signal conditioning in consumer and industrial equipment.

FAQ

What is the h_FE range guaranteed for the 2SA1122CDTL-E?

The 2SA1122CDTL-E is Grade D, marked "CD", with a guaranteed DC current transfer ratio h_FE of 250 to 500 at V_CE = –12 V and I_C = –2 mA. This range is binned and verified per Renesas' datasheet Rev.2.00, ensuring predictable gain behavior in amplifier feedback networks without post-assembly adjustment.

Is the 2SA1122CDTL-E RoHS compliant?

Yes, the 2SA1122CDTL-E complies with the EU RoHS Directive, as confirmed by Renesas Electronics' environmental compliance documentation. The device contains no lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls (PBB), or polybrominated diphenyl ethers (PBDE), and is suitable for use in environmentally regulated consumer electronics.

What is the maximum allowable collector power dissipation for the 2SA1122CDTL-E at 75°C ambient?

Per the Maximum Collector Dissipation Curve on page 4 of the 2SA1122 datasheet, the 2SA1122CDTL-E must be derated linearly above 25°C. At T_a = 75°C, allowable P_C drops to approximately 100 mW - calculated as 150 mW × (1 – (75 – 25)/125) - requiring careful thermal layout or reduced bias current in sustained operation.

Can the 2SA1122CDTL-E replace the 2SA1122CCTL-E in the same PCB layout?

Yes, the 2SA1122CDTL-E and 2SA1122CCTL-E share identical MPAK (SC-59A) package dimensions, pinout, and soldering footprint. The only difference is h_FE grading: "CC" denotes 160–320, while "CD" specifies 250–500. No PCB changes are required for substitution, provided the circuit functions within the higher gain range.

What is the typical Cob (collector output capacitance) of the 2SA1122CDTL-E at V_CB = –10 V?

The typical collector output capacitance Cob of the 2SA1122CDTL-E is 15 pF at V_CB = –10 V and f = 1 MHz, as shown in the "Collector Output Capacitance vs. Collector to Base Voltage" graph on page 3 of the datasheet. This value directly impacts high-frequency roll-off in amplifier stages and should be included in AC small-signal modeling.

2SA1122CDTL-E Specifications

Product attributes: Attribute value

Manufacturer:: Renesas

Series:: -

Package/Case:: SC-70, SOT-323

Packaging:: Bulk

Product Status:: Active

Transistor Type:: PNP

Current - Collector (Ic) (Max):: 100 mA

Voltage - Collector Emitter Breakdown (Max):: 55 V

Vce Saturation (Max) @ Ib, Ic:: 500mV @ 1mA, 10mA

Current - Collector Cutoff (Max):: 500nA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 160 @ 2mA, 12V

Power - Max:: 150 mW

Frequency - Transition:: -

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 3-CMPAK

2SA1122CDTL-E FAQ

1.How can I place an order for 2SA1122CDTL-E through Aetrix?

Please submit a Request for Quotation (RFQ) for 2SA1122CDTL-E 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 2SA1122CDTL-E reliable?

The price and inventory of 2SA1122CDTL-E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2SA1122CDTL-E is usually 5 days.

3.What payment methods are accepted for 2SA1122CDTL-E?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2SA1122CDTL-E transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 2SA1122CDTL-E?

2SA1122CDTL-E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 2SA1122CDTL-E 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 2SA1122CDTL-E?

For technical support, including 2SA1122CDTL-E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2SA1122CDTL-E requirements.

6.How does Aetrix verify that 2SA1122CDTL-E is sourced from the original manufacturer or authorized distributors?

All 2SA1122CDTL-E 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 2SA1122CDTL-E meets industry standards.

7.What is the process for return or replacement of 2SA1122CDTL-E?

All 2SA1122CDTL-E units undergo pre-shipment inspection (PSI). If there is an issue with 2SA1122CDTL-E, 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 2SA1122CDTL-E part is unused and in its original packaging.

Return procedure for 2SA1122CDTL-E:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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