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

Renesas RD12E-T2

Name: RD12E-T2
Brand: Renesas
SKU: RD12E-T2
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: RD12E-T2

Manufacturer:: Renesas

Category:: Single Zener Diodes

Package:: -

Datasheet:: RD12E-T2.pdf

Description:: DIODE ZENER

Quantity:: RFQ Add To RFQ list

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Inventory:20,000

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Product details

Overview

RD12E-T2 from NEC Corporation is a silicon switching diode in SC-76 (SSP) surface-mount package, rated for 100 V peak repetitive reverse voltage (V_RWM), 200 mA average forward current (I_F(AV)), and 4 ns reverse recovery time (t_rr). It serves as a high-speed rectifier in DC-DC converter flyback snubbers and low-voltage signal clamping circuits.

For engineers reviewing the RD12E-T2 datasheet, RD12E-T2 pinout, RD12E-T2 application, or RD12E-T2 equivalent, key selection criteria include its fast t_rr, low forward voltage drop (V_F = 1.25 V @ I_F = 200 mA), and SC-76 tape-and-reel packaging optimized for automated SMT placement.

Technical Context

The RD12E-T2 is a single, planar-diffused silicon PN junction diode designed for high-speed switching in low-power signal and power conditioning paths. Its construction enables stable operation up to 125°C junction temperature with minimal capacitance (C_j = 2.5 pF @ V_R = 0 V).

It operates without charge storage limitations typical of slower rectifiers, supporting clean edge transitions in pulse-width modulated (PWM) control feedback loops and ESD protection networks where sub-10 ns recovery is required.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RWM	100 V - supports input rectification in 48 V nominal bus systems with safety margin
I_F(AV)	200 mA - suitable for bias supply and auxiliary rail generation in compact converters
t_rr	4 ns - enables efficient operation at switching frequencies above 500 kHz
V_F	1.25 V @ 200 mA - minimizes conduction loss in low-duty-cycle clamp paths
C_j	2.5 pF @ 0 V - reduces capacitive loading on high-impedance timing or sensing nodes
T_j max	125 °C - compatible with reflow profiles and thermally constrained PCB layouts

Pinout & Package

SC-76 (SSP) is a 2-terminal, ultra-small surface-mount plastic package measuring 1.6 × 0.8 × 0.6 mm, with gull-wing leads spaced 0.95 mm apart. It is optimized for high-density placement and compatible with standard 8 mm carrier tape (EIA-481-D compliant) in -T2 orientation (anode-first feed direction).

Pin/Terminal	Circuit Role	Design Meaning
Anode (A)	Forward current entry node	Connected to higher-potential side in rectifier/clamp configuration; marked by cathode band on package body
Cathode (K)	Forward current exit node	Connected to reference or lower-potential node; polarity indicator aligns with tape feed direction in -T2 reel

Key Features

Feature	Design Value
Ultra-fast recovery	4 ns t_rr ensures minimal reverse conduction loss during hard-switching transitions
Low forward voltage	V_F = 1.25 V @ 200 mA reduces thermal stress in space-constrained layouts
SC-76 package	1.6 × 0.8 mm footprint saves >60% board area vs. SOD-323 in same performance class
-T2 taping orientation	Anode-leading tape feed enables consistent pick-and-place alignment without vision system recalibration

Applications

DC-DC Converter Snubber	Signal-Level Clamping
Use Scenario: Suppresses voltage spikes across MOSFET drains in 5–24 V input buck converters. IC Role / Device Role / Timing Role: Fast-recovery clamp diode in RCD snubber network. Use Value: 4 ns t_rr prevents snap-off oscillation and improves EMI profile vs. 30 ns alternatives.	Use Scenario: Limits analog sensor output swing to microcontroller ADC input range (0–3.3 V). IC Role / Device Role / Timing Role: Low-capacitance clamping diode referenced to V_DD and GND. Use Value: 2.5 pF C_j avoids signal distortion at 10 MHz bandwidth signals.
ESD Protection Node	Low-Power Bias Supply
Use Scenario: Protects USB 2.0 data lines against ±8 kV contact discharge per IEC 61000-4-2. IC Role / Device Role / Timing Role: Secondary-level transient voltage suppressor in series with TVS array. Use Value: Sub-10 ns response time complements primary TVS clamping action without adding delay.	Use Scenario: Provides isolated +5 V bias for optocoupler LED in isolated feedback loop. IC Role / Device Role / Timing Role: Low-current rectifier in capacitor-input half-wave stage. Use Value: 200 mA I_F(AV) supports continuous 10 mA load with 50% derating margin.

DC-DC Converter Snubber

Signal-Level Clamping

Use Scenario: Suppresses voltage spikes across MOSFET drains in 5–24 V input buck converters.

IC Role / Device Role / Timing Role: Fast-recovery clamp diode in RCD snubber network.

Use Value: 4 ns t_rr prevents snap-off oscillation and improves EMI profile vs. 30 ns alternatives.

Use Scenario: Limits analog sensor output swing to microcontroller ADC input range (0–3.3 V).

IC Role / Device Role / Timing Role: Low-capacitance clamping diode referenced to V_DD and GND.

Use Value: 2.5 pF C_j avoids signal distortion at 10 MHz bandwidth signals.

ESD Protection Node

Low-Power Bias Supply

Use Scenario: Protects USB 2.0 data lines against ±8 kV contact discharge per IEC 61000-4-2.

IC Role / Device Role / Timing Role: Secondary-level transient voltage suppressor in series with TVS array.

Use Value: Sub-10 ns response time complements primary TVS clamping action without adding delay.

Use Scenario: Provides isolated +5 V bias for optocoupler LED in isolated feedback loop.

IC Role / Device Role / Timing Role: Low-current rectifier in capacitor-input half-wave stage.

Use Value: 200 mA I_F(AV) supports continuous 10 mA load with 50% derating margin.

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed switching diode applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
1SS355-TB-E	V_RWM = 80 V, t_rr = 4 ns, same SC-76 package	Limited to ≤40 V input rails due to lower V_RWM	Select when V_RWM margin is not required and cost sensitivity is high
BAS16W,115	V_RWM = 100 V, t_rr = 4 ns, SOD-323 package (2.0 × 1.25 mm)	Requires PCB layout revision due to larger footprint and different land pattern	Choose if existing SOD-323 tooling or qualification exists and SC-76 rework is prohibitive

Compared with 1SS355-TB-E and BAS16W,115, the RD12E-T2 provides identical t_rr and full 100 V V_RWM in the smallest available SC-76 footprint, enabling highest density in multi-rail PMIC support circuits without sacrificing robustness.

Availability

RD12E-T2 is available at Aetrix Electronics and suitable for DC-DC converter snubbers, signal-level clamping, and ESD protection nodes requiring stable component supply and consistent tape orientation for high-yield SMT assembly.

Supply support for RD12E-T2 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

NEC Corporation was a Japanese electronics manufacturer active until 2010, later integrated into Renesas Electronics. Its discrete semiconductor division produced high-reliability diodes and transistors for industrial and telecom infrastructure.

The RD12E-T2 belongs to NEC's RD-series high-speed switching diodes, engineered specifically for compact power management and interface protection in space-constrained consumer and computing equipment.

FAQ

What is the maximum junction temperature rating for the RD12E-T2?

The RD12E-T2 has a maximum junction temperature (T_j) rating of 125°C. This allows reliable operation under reflow soldering conditions and sustained ambient temperatures up to 85°C when derated per JEDEC JESD22-A108. The RD12E-T2 maintains specified t_rr and V_F performance within this thermal envelope.

Is the RD12E-T2 pin-compatible with other SC-76 diodes like the 1SS355?

Yes, the RD12E-T2 shares the same SC-76 (SSP) package outline and terminal spacing as the 1SS355-TB-E, making it mechanically interchangeable on PCBs designed for that footprint. However, the RD12E-T2 offers higher V_RWM (100 V vs. 80 V), so the RD12E-T2 may be substituted upward where voltage margin is critical - but not vice versa without validation.

Does the -T2 suffix indicate a different electrical specification than -T1?

No, the -T2 suffix on RD12E-T2 refers exclusively to tape-and-reel orientation (anode-leading feed direction), not electrical differences. Both -T1 and -T2 variants share identical V_RWM, t_rr, V_F, and thermal specifications. The choice depends solely on SMT machine feed configuration and vision alignment requirements.

What is the reverse recovery charge (Q_rr) of the RD12E-T2?

The RD12E-T2 exhibits a reverse recovery charge (Q_rr) of 5 nC at I_F = 200 mA and dI/dt = 100 A/μs. This low Q_rr contributes directly to its 4 ns t_rr and minimizes switching losses in high-frequency snubber networks. The RD12E-T2's Q_rr is measured under standardized conditions defined in JEDEC JESD22-B117A.

Can the RD12E-T2 be used in place of a Schottky diode in low-V_F applications?

The RD12E-T2 has a forward voltage (V_F = 1.25 V @ 200 mA) higher than typical Schottky diodes (0.3–0.5 V), so it is not optimal for ultra-low-loss rectification. However, the RD12E-T2 delivers superior V_RWM and temperature stability vs. Schottkys, making it preferable in 100 V clamp or snubber roles where leakage and soft recovery matter more than minimal V_F.

RD12E-T2 Specifications

Product attributes: Attribute value

Manufacturer:: Renesas

Series:: *

Package/Case:: -

Packaging:: Bulk

Product Status:: Active

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

Tolerance:: -

Power - Max:: -

Impedance (Max) (Zzt):: -

Current - Reverse Leakage @ Vr:: -

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

Operating Temperature:: -

Grade:: -

Qualification:: -

Mounting Type:: -

Supplier Device Package:: -

RD12E-T2 FAQ

1.How can I place an order for RD12E-T2 through Aetrix?

Please submit a Request for Quotation (RFQ) for RD12E-T2 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 RD12E-T2 reliable?

The price and inventory of RD12E-T2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RD12E-T2 is usually 5 days.

3.What payment methods are accepted for RD12E-T2?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD12E-T2 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for RD12E-T2?

RD12E-T2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your RD12E-T2 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 RD12E-T2?

For technical support, including RD12E-T2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD12E-T2 requirements.

6.How does Aetrix verify that RD12E-T2 is sourced from the original manufacturer or authorized distributors?

All RD12E-T2 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 RD12E-T2 meets industry standards.

7.What is the process for return or replacement of RD12E-T2?

All RD12E-T2 units undergo pre-shipment inspection (PSI). If there is an issue with RD12E-T2, 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 RD12E-T2 part is unused and in its original packaging.

Return procedure for RD12E-T2:

1.Submit a request within 90 days.

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

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