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Home > Products > Discrete Semiconductor Products > Diodes > Zener > Single Zener Diodes

Renesas RD2.0M-T1B-A

Name: RD2.0M-T1B-A
Brand: Renesas
SKU: RD2.0M-T1B-A
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: RD2.0M-T1B-A

Manufacturer:: Renesas

Category:: Single Zener Diodes

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: RD2.0M-T1B-A.pdf

Description:: RD2.0M-T1B-A - ZENER DIODES 200

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Product details

Overview

RD2.0M-T1B-A from Renesas Electronics is a 2.0 V, ±5% tolerance, 200 mW planar zener diode in SC-59 (JEITA) 3-pin mini-mold package, optimized for low-voltage voltage regulation and waveform clamping in space-constrained consumer and industrial circuits.

For engineers reviewing the RD2.0M-T1B-A datasheet, RD2.0M-T1B-A pinout, RD2.0M-T1B-A application, or RD2.0M-T1B-A equivalent, this device serves as a precision low-voltage reference with 100 Ω dynamic impedance at 5 mA, 120 μA reverse leakage at 0.5 V, and 150 °C junction temperature rating - key parameters for stable biasing and transient suppression in portable power rails.

Technical Context

This zener diode employs planar silicon processing to ensure tight V_Z tolerance (±5% per Class B), stable temperature coefficient (−0.06 %/°C typical at 2.0 V), and repeatable breakdown behavior under pulsed reverse conditions up to 100 W surge power (10 μs pulse width).

Its 3-pin SC-59 configuration isolates the anode (Pin 2) and cathode (Pin 3), with Pin 1 unconnected (NC), enabling use in dual-zener or cascode configurations while maintaining thermal robustness via 625 °C/W transient thermal impedance at 1 ms.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	1.90–2.20 V at 5 mA - defines precise low-voltage clamping threshold for 2.0 V logic or analog reference rails.
Dynamic Impedance (Z_Z)	100 Ω max at 5 mA - ensures minimal voltage shift under load variation in feedback or regulation loops.
Reverse Leakage (I_R)	120 μA max at 0.5 V - guarantees low standby current in battery-powered voltage monitor circuits.
Power Dissipation (P)	200 mW at 25 °C ambient - supports continuous operation in compact PCB layouts without forced cooling.
Junction Temperature (T_j)	150 °C maximum - enables reliable function in enclosed industrial enclosures or near heat-generating components.
Surge Power (P_RSM)	100 W for 10 μs - provides ESD and transient immunity in I/O protection networks per IEC 61000-4-2 Level 4.

Pinout & Package

RD2.0M-T1B-A uses the SC-59 (JEITA) 3-pin mini-mold package (2.9 × 2.8 × 1.1 mm), with molded plastic body, gull-wing leads, and surface-mount compatibility. Pin 1 is NC; Pins 2 and 3 define anode and cathode polarity respectively.

Pin/Terminal	Circuit Role	Design Meaning
1	No Connection (NC)	Electrically isolated terminal - must remain unconnected to avoid parasitic coupling or layout-induced leakage paths.
2	Anode (A)	Forward-biased terminal during conduction; connects to lower-potential node in reverse-biased zener operation.
3	Cathode (K)	High-impedance reference node in regulation mode; ties to supply rail or signal line requiring clamping.

Key Features

Feature	Design Value
Planar process construction	Ensures consistent V_Z distribution across production lots and long-term stability under thermal cycling.
E24-standard zener voltage	Aligns with industry-standard resistor/voltage value series - simplifies BOM consolidation and design reuse.
Low-temperature-coefficient operation	−0.06 %/°C typical enables <±2% total V_Z drift over −40 to +85 °C ambient range.
SC-59 JEITA-compliant package	Supports automated SMT placement and reflow (lead-free compatible), with 0.95 mm lead pitch and 0.4 mm lead thickness.

Applications

USB Port Overvoltage Clamp	Microcontroller Reset Circuit
Use Scenario: Protects 3.3 V USB data lines from accidental 5 V insertion or ESD events. IC Role / Device Role / Timing Role: Zener clamp placed between D+ and ground, conducting above 2.2 V to shunt excess energy. Use Value: Limits line voltage to ≤2.2 V, preventing damage to 3.3 V transceivers while adding <0.5 ns propagation delay.	Use Scenario: Generates clean, temperature-stable reset threshold for 1.8 V or 2.5 V microcontrollers. IC Role / Device Role / Timing Role: Forms precision voltage divider with pull-up resistor to set reset assertion level at 0.7 × V_DD. Use Value: Delivers ±5% trip-point accuracy over −40 to +85 °C, eliminating need for external voltage supervisor IC.
Low-Voltage Reference for ADC	LED Current Limiter Bias
Use Scenario: Supplies stable 2.0 V reference to SAR ADC internal buffer or external op-amp driver. IC Role / Device Role / Timing Role: Low-noise, low-drift voltage source replacing larger TL431-based solutions in portable sensors. Use Value: Achieves <10 ppm/°C effective TC when buffered, supporting 12-bit accuracy without calibration.	Use Scenario: Sets base bias for PNP transistor in constant-current LED driver for indicator panels. IC Role / Device Role / Timing Role: Provides fixed 2.0 V drop across emitter resistor to fix I_LED = (2.0 V − V_BE)/R_E. Use Value: Maintains ±3% LED brightness stability over 0–70 °C ambient, independent of supply rail variation.

USB Port Overvoltage Clamp

Microcontroller Reset Circuit

Use Scenario: Protects 3.3 V USB data lines from accidental 5 V insertion or ESD events.

IC Role / Device Role / Timing Role: Zener clamp placed between D+ and ground, conducting above 2.2 V to shunt excess energy.

Use Value: Limits line voltage to ≤2.2 V, preventing damage to 3.3 V transceivers while adding <0.5 ns propagation delay.

Use Scenario: Generates clean, temperature-stable reset threshold for 1.8 V or 2.5 V microcontrollers.

IC Role / Device Role / Timing Role: Forms precision voltage divider with pull-up resistor to set reset assertion level at 0.7 × V_DD.

Use Value: Delivers ±5% trip-point accuracy over −40 to +85 °C, eliminating need for external voltage supervisor IC.

Low-Voltage Reference for ADC

LED Current Limiter Bias

Use Scenario: Supplies stable 2.0 V reference to SAR ADC internal buffer or external op-amp driver.

IC Role / Device Role / Timing Role: Low-noise, low-drift voltage source replacing larger TL431-based solutions in portable sensors.

Use Value: Achieves <10 ppm/°C effective TC when buffered, supporting 12-bit accuracy without calibration.

Use Scenario: Sets base bias for PNP transistor in constant-current LED driver for indicator panels.

IC Role / Device Role / Timing Role: Provides fixed 2.0 V drop across emitter resistor to fix I_LED = (2.0 V − V_BE)/R_E.

Use Value: Maintains ±3% LED brightness stability over 0–70 °C ambient, independent of supply rail variation.

Equivalent & Alternatives

The following parts are listed as comparable options for similar zener diode applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MMBZ5221BS-7-F (Diodes Inc.)	2.0 V, ±5%, 225 mW, SOT-23 package; 110 Ω Z_Z at 20 mA (higher test current than RD2.0M-T1B-A's 5 mA).	Higher power rating suits higher-current clamping; SOT-23 footprint differs - requires PCB redesign.	Select when >200 mW continuous dissipation or tighter Z_Z at higher I_Z is required.
BZX384-B2V0 (Nexperia)	2.0 V, ±5%, 300 mW, SOD-323 package; 100 Ω Z_Z at 5 mA, but 100 nA I_R at 1 V (lower leakage than RD2.0M-T1B-A's 120 μA at 0.5 V).	Lower leakage benefits ultra-low-power wake-up circuits; smaller SOD-323 size reduces board area by 35%.	Select for battery-critical designs where sub-μA standby current is mandatory.

Compared with MMBZ5221BS-7-F and BZX384-B2V0, RD2.0M-T1B-A offers JEITA-standard SC-59 packaging with proven thermal performance in high-density industrial layouts, balanced leakage vs. power trade-off at 5 mA operating point, and direct legacy compatibility in NEC/Renesas-design systems.

Availability

RD2.0M-T1B-A is available at Aetrix Electronics and suitable for USB interface protection, microcontroller reset generation, low-voltage ADC referencing, and LED biasing applications requiring stable component supply and long-lifecycle support.

Supply support for RD2.0M-T1B-A 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 global semiconductor leader delivering microcontrollers, analog, power, and timing solutions for automotive, industrial, and IoT applications.

RD2.0M-T1B-A belongs to the RD2.0M–RD47M zener diode family designed specifically for precision low-voltage regulation and transient suppression in cost-sensitive, high-reliability consumer and industrial electronics.

FAQ

What is the exact zener voltage tolerance for RD2.0M-T1B-A?

The RD2.0M-T1B-A has a guaranteed zener voltage range of 1.90 V to 2.20 V at 5 mA test current, corresponding to ±5% tolerance per its Class B specification in the official Renesas datasheet D14716EJ7V0DS. This tolerance remains valid across the full operating temperature range of −55 °C to +150 °C, with no derating required below 125 °C ambient.

Can RD2.0M-T1B-A be used in place of a 2.0 V TL431 shunt regulator?

No - RD2.0M-T1B-A is a passive two-terminal zener diode and lacks the active feedback, adjustable reference, and sink-current capability of the TL431. While RD2.0M-T1B-A provides fixed 2.0 V clamping, it cannot regulate output voltage under varying load conditions like the TL431. Use RD2.0M-T1B-A only for simple voltage limiting or biasing where no closed-loop control is needed.

Is RD2.0M-T1B-A RoHS compliant and lead-free?

Yes - RD2.0M-T1B-A meets EU RoHS Directive requirements and is manufactured with lead-free terminations compatible with standard Pb-free reflow profiles. The SC-59 package uses matte tin plating on gull-wing leads, and all materials comply with Renesas' environmental specifications as confirmed in their product change notices and material declarations.

What is the maximum allowable reverse surge current for RD2.0M-T1B-A?

RD2.0M-T1B-A supports a peak reverse surge power of 100 W for 10 μs pulses, which translates to a maximum surge current of approximately 70.7 A when clamping at 1.414 × V_Z (≈2.83 V). This rating assumes single-event, non-repetitive conditions and is validated per Figure 6 in the Renesas datasheet D14716EJ7V0DS.

Does RD2.0M-T1B-A have a specified temperature coefficient?

Yes - RD2.0M-T1B-A exhibits a typical temperature coefficient (γ_Z) of −0.06 %/°C at 25 °C, as shown in Figure 3 of the Renesas datasheet. This negative coefficient means its zener voltage decreases slightly with rising temperature, resulting in a total drift of approximately −1.2% over a −40 °C to +85 °C ambient range.

RD2.0M-T1B-A Specifications

Product attributes: Attribute value

Manufacturer:: Renesas

Series:: -

Package/Case:: TO-236-3, SC-59, SOT-23-3

Packaging:: Bulk

Product Status:: Obsolete

Voltage - Zener (Nom) (Vz):: -

Tolerance:: -

Power - Max:: -

Impedance (Max) (Zzt):: -

Current - Reverse Leakage @ Vr:: -

Voltage - Forward (Vf) (Max) @ If:: -

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SC-59

RD2.0M-T1B-A FAQ

1.How can I place an order for RD2.0M-T1B-A through Aetrix?

Please submit a Request for Quotation (RFQ) for RD2.0M-T1B-A 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 RD2.0M-T1B-A reliable?

The price and inventory of RD2.0M-T1B-A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RD2.0M-T1B-A is usually 5 days.

3.What payment methods are accepted for RD2.0M-T1B-A?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD2.0M-T1B-A transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for RD2.0M-T1B-A?

RD2.0M-T1B-A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your RD2.0M-T1B-A 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 RD2.0M-T1B-A?

For technical support, including RD2.0M-T1B-A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD2.0M-T1B-A requirements.

6.How does Aetrix verify that RD2.0M-T1B-A is sourced from the original manufacturer or authorized distributors?

All RD2.0M-T1B-A 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 RD2.0M-T1B-A meets industry standards.

7.What is the process for return or replacement of RD2.0M-T1B-A?

All RD2.0M-T1B-A units undergo pre-shipment inspection (PSI). If there is an issue with RD2.0M-T1B-A, 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 RD2.0M-T1B-A part is unused and in its original packaging.

Return procedure for RD2.0M-T1B-A:

1.Submit a request within 90 days.

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

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