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Toshiba Semiconductor and Storage RN2421(TE85L,F)
- Part No.:
- RN2421(TE85L,F)
- Manufacturer:
- Toshiba Semiconductor and Storage
- Category:
- Single, Pre-Biased Bipolar Transistors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
RN2421(TE85L,F).pdf
- Description:
- TRANS PREBIAS PNP 50V 0.8A SMINI
- Quantity:
- Payment:
- Shipping:
Inventory:9,215
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Product details
Overview
RN2421(TE85L,F) from Toshiba Electronic Devices & Storage Corporation is a silicon PNP epitaxial bipolar transistor with integrated bias resistors (R1 = 1 kΩ, R2 = 1 kΩ), designed for switching and interfacing applications in compact DC-DC converters and logic-level driver circuits. It delivers IC(max) = −800 mA, VCEO = −50 V, VCE(sat) = −0.365 V (typ.) at IC = −100 mA, and hFE = 60–200 (IC = −50 mA), enabling low-loss, space-efficient active switching.
For engineers reviewing the RN2421(TE85L,F) datasheet, RN2421(TE85L,F) pinout, RN2421(TE85L,F) application, or RN2421(TE85L,F) equivalent, key selection criteria include verified built-in resistor values (R1/R2 = 1.0), guaranteed VCE(sat) ≤ −0.703 V at rated current, S-Mini package compatibility with high-density PCB layouts, and complementary pairing with RN1421 series for push-pull designs.
Technical Context
The RN2421(TE85L,F) implements a monolithic PCT-process PNP transistor with two laser-trimmed on-die resistors-R1 connected between base and emitter, R2 between base and collector-enabling single-pin control without external bias networks. Its −50 V VCEO rating supports operation in 24 V and 48 V industrial bus interfaces.
Electrical behavior is characterized by low saturation voltage (−0.365 V typ. at IC = −100 mA), high DC gain (hFE ≥ 60 at IC = −50 mA), and tight VI(ON) threshold (−1.0 V min at IC = −50 mA), making it suitable for direct microcontroller GPIO-driven switching where base current sourcing is constrained.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | −50 V: Supports switching in 24 V/48 V supply rails with margin against transients. |
| IC(max) | −800 mA: Enables driving medium-power loads such as relays, LEDs, or small solenoids directly. |
| VCE(sat) | −0.365 V (typ.) at IC = −100 mA: Minimizes conduction loss and self-heating in continuous-duty switching. |
| hFE | 60–200 at IC = −50 mA: Ensures reliable turn-on with limited base drive current (e.g., 1–2 mA from MCU). |
| R1 / R2 | 1.0 kΩ / 1.0 kΩ: Provides fixed, stable bias ratio for predictable ON/OFF thresholds and noise immunity. |
| fT | 13 MHz: Sufficient for PWM frequencies up to ~1–2 MHz in digital power and motor control. |
| Pc | 200 mW: Allows operation at full current with minimal heatsinking in S-Mini footprint. |
Pinout & Package
Package: S-Mini (JEDEC TO-236AB), 3-pin surface-mount plastic package, 12 mg typical weight, footprint compatible with automated placement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base | Input node for control signal; internally connected to R1 (to Emitter) and R2 (to Collector). |
| 2 | Emitter | Common reference terminal; tied to system ground or negative rail in PNP switching configuration. |
| 3 | Collector | Switched output node; connects to load (e.g., relay coil anode or LED cathode) in high-side switch topology. |
Key Features
| Feature | Design Value |
|---|---|
| Built-in bias resistors | Eliminates need for two external resistors, reducing BOM count and PCB area in GPIO-driven switches. |
| Low VCE(sat) | −0.365 V typical enables <100 mW conduction loss at 100 mA, improving thermal performance in sealed enclosures. |
| Complementary pairing | Matched to RN1421 series (NPN) for balanced push-pull output stages without discrete resistor matching. |
| High hFE range | 60–200 ensures robust turn-on across process variation and temperature (−55°C to +150°C junction). |
| S-Mini package | 0.95 mm × 1.9 mm footprint supports high-density routing in space-constrained IoT sensor nodes and wearables. |
Applications
| Industrial Relay Drivers | Microcontroller GPIO Interface |
|---|---|
Use Scenario: Driving 24 V DC electromagnetic relays in PLC I/O modules with 3.3 V/5 V microcontrollers. IC Role / Device Role / Timing Role: High-side PNP switch controlling relay coil current path to ground. Use Value: Eliminates external base resistors and reduces component count per channel, lowering assembly cost and failure points. |
Use Scenario: Level-shifting and inverting logic signals between mixed-voltage domains (e.g., 1.8 V MCU to 5 V peripheral). IC Role / Device Role / Timing Role: Digital inverter with defined VI(ON)/VI(OFF) thresholds for clean signal translation. Use Value: Guaranteed −1.0 V VI(ON) min ensures reliable turn-on even with weak GPIO pull-downs or leakage. |
| LED Current Switching | DC-DC Converter Bias Circuit |
Use Scenario: Switching high-brightness white LEDs in automotive interior lighting with constant-current drivers. IC Role / Device Role / Timing Role: Low-saturation switch in the LED anode path for precise current regulation. Use Value: −0.365 V VCE(sat) limits voltage headroom loss, preserving >95% of supply voltage for current-setting resistor. |
Use Scenario: Providing stable bias current to error amplifiers or reference circuits in isolated flyback controllers. IC Role / Device Role / Timing Role: Precision current source enabled by matched R1/R2 and stable hFE. Use Value: Fixed 1 kΩ/1 kΩ resistor ratio ensures consistent base current across temperature and unit variance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP digital transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NSV2421T1G | R1/R2 = 1.0 kΩ/1.0 kΩ, same SOT-23 package, but hFE min = 50 (vs. 60), VCE(sat) max = −0.75 V (vs. −0.703 V). | Suitable for lower-gain tolerance designs; slightly higher saturation loss may affect thermal margin at 800 mA. | Prefer RN2421(TE85L,F) when guaranteed hFE ≥ 60 and tighter VCE(sat) are required for reliability-critical drivers. |
| DXT3904P-7-F | PNP digital transistor in SOT-23, R1/R2 = 10 kΩ/10 kΩ - higher bias resistance increases VI(ON) threshold to −2.0 V min. | Better suited for 5 V logic systems; less compatible with 3.3 V or 1.8 V GPIO due to higher turn-on voltage. | Select RN2421(TE85L,F) for direct 3.3 V MCU interface; choose DXT3904P-7-F only if higher VI(ON) improves noise immunity in noisy environments. |
Compared with NSV2421T1G and DXT3904P-7-F, the RN2421(TE85L,F) offers the lowest guaranteed VCE(sat) and highest minimum hFE in its class, making it optimal for thermally constrained, high-reliability switching where base drive current is limited and saturation loss must be minimized.
Availability
RN2421(TE85L,F) is available at Aetrix Electronics and suitable for industrial relay drivers, microcontroller GPIO interfaces, LED current switching, and DC-DC converter bias circuits requiring stable component supply and long-term obsolescence management.
Supply support for RN2421(TE85L,F) 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
Toshiba Electronic Devices & Storage Corporation is a Japanese semiconductor manufacturer specializing in power devices, analog ICs, and discrete components for industrial, automotive, and consumer applications.
The RN2421(TE85L,F) belongs to Toshiba's RN24xx family of bias-resistor-equipped transistors, engineered to simplify digital switching designs by integrating precision-matched resistors and delivering consistent gain and saturation performance across temperature.
FAQ
What is the maximum collector current rating for RN2421(TE85L,F)?
The absolute maximum collector current for RN2421(TE85L,F) is −800 mA, specified under pulsed conditions with appropriate derating for ambient temperature and PCB copper area. Continuous operation at this level requires thermal design verification using the 200 mW power dissipation limit and junction-to-ambient thermal resistance of the S-Mini package.
Does RN2421(TE85L,F) have a complementary NPN part?
Yes, RN2421(TE85L,F) is explicitly designed as complementary to the RN1421 series of NPN digital transistors. Toshiba documents this pairing in the "Features" section, confirming matched bias resistor ratios and compatible electrical characteristics for push-pull and H-bridge configurations.
What are the exact built-in resistor values for RN2421(TE85L,F)?
RN2421(TE85L,F) has R1 = 1.0 kΩ (base-to-emitter) and R2 = 1.0 kΩ (base-to-collector), with a resistor ratio R1/R2 = 1.0. These values are confirmed in the "Bias Resistor Values" table of the official Toshiba datasheet revision 1.0 dated 2025-07-30.
Is RN2421(TE85L,F) RoHS compliant?
Yes, RN2421(TE85L,F) complies with the EU RoHS Directive. Toshiba confirms RoHS compliance for the RN2421 to RN2427 family in its environmental documentation, and the device carries standard lead-free plating and halogen-free molding compound per industry requirements.
What is the storage temperature range for RN2421(TE85L,F)?
The specified storage temperature range for RN2421(TE85L,F) is −55°C to +150°C, matching its junction temperature rating. This wide range supports long-term warehouse storage and operation in harsh industrial or automotive under-hood environments without preconditioning.
RN2421(TE85L,F) Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Toshiba Semiconductor and Storage
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- Transistor Type:
- PNP - Pre-Biased
- Current - Collector (Ic) (Max):
- 800 mA
- Voltage - Collector Emitter Breakdown (Max):
- 50 V
- Resistor - Base (R1):
- 1 kOhms
- Resistor - Emitter Base (R2):
- 1 kOhms
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 60 @ 100mA, 1V
- Vce Saturation (Max) @ Ib, Ic:
- 250mV @ 2mA, 50mA
- Current - Collector Cutoff (Max):
- 500nA
- Frequency - Transition:
- 200 MHz
- Power - Max:
- 200 mW
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- S-Mini
RN2421(TE85L,F) FAQ
1.How can I place an order for RN2421(TE85L,F) through Aetrix?
Please submit a Request for Quotation (RFQ) for RN2421(TE85L,F) 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 RN2421(TE85L,F) reliable?
The price and inventory of RN2421(TE85L,F) are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RN2421(TE85L,F) is usually 5 days.
3.What payment methods are accepted for RN2421(TE85L,F)?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RN2421(TE85L,F) transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RN2421(TE85L,F)?
RN2421(TE85L,F) orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RN2421(TE85L,F) 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 RN2421(TE85L,F)?
For technical support, including RN2421(TE85L,F) datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RN2421(TE85L,F) requirements.
6.How does Aetrix verify that RN2421(TE85L,F) is sourced from the original manufacturer or authorized distributors?
All RN2421(TE85L,F) 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 RN2421(TE85L,F) meets industry standards.
7.What is the process for return or replacement of RN2421(TE85L,F)?
All RN2421(TE85L,F) units undergo pre-shipment inspection (PSI). If there is an issue with RN2421(TE85L,F), 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 RN2421(TE85L,F) part is unused and in its original packaging.
Return procedure for RN2421(TE85L,F):
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
RN2421(TE85L,F) Tags
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