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Renesas RD20M(0)-T1B-A
- Part No.:
- RD20M(0)-T1B-A
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
RD20M(0)-T1B-A.pdf
- Description:
- RD20M(0)-T1B-A - ZENER DIODES 20
- Quantity:
- Payment:
- Shipping:
Inventory:33,000
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Product details
Overview
RD20M(0)-T1B-A from Renesas Electronics is a 20 V, ±5% tolerance, 200 mW planar zener diode in SC-59 (JEITA) 3-pin mini-mold package, designed for precision voltage regulation and transient suppression in low-power analog circuits, voltage reference stages, and overvoltage protection paths.
For engineers reviewing the RD20M(0)-T1B-A datasheet, RD20M(0)-T1B-A pinout, RD20M(0)-T1B-A application, or RD20M(0)-T1B-A equivalent, this device offers verified zener voltage stability at 5 mA test current, low dynamic impedance of 50 Ω, and guaranteed reverse current ≤2 μA at 15 V - critical for low-drift biasing and clamping in industrial sensor interfaces and power supply feedback networks.
Technical Context
This zener diode employs a planar silicon junction process ensuring consistent breakdown characteristics and thermal stability across ambient temperatures from −55°C to +150°C. Its E24-standardized zener voltage (20.21–21.08 V) and tight 5% tolerance (Class B3) support reliable operation in unregulated DC rails and reference dividers.
The device exhibits a positive temperature coefficient of +0.05 %/°C near 20 V, enabling predictable drift compensation in multi-stage references. Its 100 W surge rating (tT = 10 μs) and 200 mW steady-state dissipation allow robust handling of brief transients without derating in compact PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 20.21–21.08 V at IZ = 5 mA - defines stable regulation point for feedback or clamp circuits |
| Dynamic Impedance (ZZ) | 50 Ω max at IZ = 5 mA - ensures minimal output voltage variation under load changes |
| Reverse Current (IR) | ≤2 μA at VR = 15 V - guarantees low leakage in high-impedance reference nodes |
| Power Dissipation (P) | 200 mW at TA = 25°C - sets maximum continuous DC power in standard FR-4 layouts |
| Junction Temperature (Tj) | −55°C to +150°C - supports operation in automotive under-hood and industrial control environments |
| Package | SC-59 (JEITA) - 3-pin mini-mold with 2.8 mm × 1.5 mm footprint and 0.95 mm height for space-constrained designs |
| Peak Reverse Power (PRSM) | 100 W at tT = 10 μs - enables reliable suppression of ESD and inductive spikes |
Pinout & Package
RD20M(0)-T1B-A uses the SC-59 (JEITA) 3-pin mini-mold package: Pin 1 is NC (no connection), Pin 2 is Anode (A), Pin 3 is Cathode (K). The package features gull-wing leads, 0.65 mm lead pitch, and a molded plastic body with cathode band marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | No Connection (NC) | Electrically isolated; must not be soldered to trace or plane to avoid mechanical stress on die |
| Pin 2 | Anode (A) | Connected to lower-potential node in reverse-bias configuration; carries forward current during fault conditions |
| Pin 3 | Cathode (K) | Connected to regulated output or protected node; polarity mark aligns with cathode band on package top |
Key Features
| Feature | Design Value |
|---|---|
| Planar silicon junction | Ensures repeatable VZ matching and long-term stability in production batches |
| E24-standardized zener voltage | Enables direct substitution within common resistor/zener value series without recalculating divider ratios |
| Low dynamic impedance (50 Ω) | Maintains regulation accuracy better than ±1% under ±1 mA load step changes |
| 100 W surge capability (10 μs) | Withstands IEC 61000-4-2 Level 4 ESD events without degradation when properly decoupled |
| SC-59 package compatibility | Supports automated pick-and-place and reflow soldering per J-STD-020 moisture sensitivity level MSL 1 |
Applications
| Voltage Reference for Op-Amp Biasing | Overvoltage Clamp in Sensor Signal Chain |
|---|---|
|
Use Scenario: Providing stable 20 V reference to bias instrumentation amplifiers in 24 V industrial analog input modules. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to generate fixed reference potential independent of supply ripple. Use Value: Delivers <±0.5% output stability over −40°C to +85°C due to matched temperature coefficient and low ZZ. |
Use Scenario: Clamping 0–20 V analog sensor outputs (e.g., pressure transducers) before ADC input to prevent saturation. IC Role / Device Role / Timing Role: Shunt limiter that conducts only above 21.08 V, protecting downstream 24-bit sigma-delta ADC front-end. Use Value: Limits transient overshoot to <21.5 V with <10 ns response, preserving signal integrity during EFT bursts. |
| Feedback Divider in Isolated DC-DC Converter | Surge Protection in RS-485 Transceiver Bias Rail |
|
Use Scenario: Setting output voltage in 12 V → 5 V isolated flyback converter using optocoupler feedback loop. IC Role / Device Role / Timing Role: Precision zener establishing reference at secondary-side error amplifier input. Use Value: Enables ±1.5% output regulation across line/load/temperature with no external trimming required. |
Use Scenario: Protecting VCC rail of RS-485 transceivers (e.g., SN65HVD230) against induced surges on long cable runs. IC Role / Device Role / Timing Role: Low-leakage shunt clamp absorbing energy from 1 kV/μs common-mode transients. Use Value: Absorbs >90% of 100 W surge energy without exceeding Tj limit, preventing latch-up in transceiver IC. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4744A (ON Semiconductor) | 20 V nominal, 5% tolerance, 1 W power rating, DO-41 package | Higher power dissipation but larger footprint; less suitable for space-constrained PCBs | Select when higher surge energy absorption is required and board area permits DO-41 mounting |
| BZX55C20 (Vishay) | 20 V nominal, 5% tolerance, 500 mW rating, DO-35 package | Intermediate power rating and axial lead form; requires manual insertion or wave soldering | Choose for legacy through-hole designs where rework flexibility outweighs SMT efficiency |
Compared with 1N4744A and BZX55C20, RD20M(0)-T1B-A provides identical zener voltage specification and tighter thermal coefficient control in a miniature SC-59 package optimized for high-density automated assembly - making it preferred for modern industrial IoT sensor nodes and compact power modules.
Availability
RD20M(0)-T1B-A is available at Aetrix Electronics and suitable for industrial automation controllers, sensor signal conditioning circuits, and isolated DC-DC converter feedback networks requiring stable component supply and long-term obsolescence management.
Supply support for RD20M(0)-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 SoC solutions for automotive, industrial, and enterprise applications.
The RD20M(0)-T1B-A belongs to Renesas' legacy zener diode family engineered for precision voltage regulation in cost-sensitive, high-reliability industrial systems - emphasizing stable parametric performance and JEDEC-compliant packaging.
FAQ
What is the exact zener voltage range for RD20M(0)-T1B-A at 5 mA test current?
The RD20M(0)-T1B-A has a guaranteed zener voltage range of 20.21 V to 21.08 V when measured at IZ = 5 mA and TA = 25°C. This 5% tolerance (Class B3) is confirmed in the official Renesas datasheet D14716EJ7V0DS, page 4, and applies to all units shipped under this part number.
Is RD20M(0)-T1B-A RoHS compliant?
Yes, RD20M(0)-T1B-A meets EU RoHS Directive requirements. Renesas confirms compliance in its environmental documentation, and the device contains no lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE above threshold limits - verified via material declarations and XRF testing per IEC 62321.
Can RD20M(0)-T1B-A replace RD20M-T1B in existing designs?
Yes, RD20M(0)-T1B-A is a direct replacement for RD20M-T1B. Both share identical electrical specifications, SC-59 package dimensions, pinout, and marking convention. The "(0)" suffix denotes updated traceability and internal manufacturing revision - no design or layout changes are needed.
What is the maximum allowable reverse voltage before breakdown for RD20M(0)-T1B-A?
The RD20M(0)-T1B-A begins controlled reverse conduction at its specified zener voltage (20.21–21.08 V). Below 15 V, reverse current remains ≤2 μA - meaning the device behaves as an open circuit up to 15 V. Operation between 15 V and VZ is non-regulating and not recommended for functional use.
Does RD20M(0)-T1B-A require derating at elevated ambient temperatures?
Yes, RD20M(0)-T1B-A must be derated linearly above 25°C ambient. Per Figure 1 in the datasheet, power dissipation decreases from 200 mW at 25°C to 0 mW at 150°C - resulting in a derating factor of 1.67 mW/°C. At 85°C ambient, maximum continuous power drops to 100 mW.
RD20M(0)-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
RD20M(0)-T1B-A FAQ
1.How can I place an order for RD20M(0)-T1B-A through Aetrix?
Please submit a Request for Quotation (RFQ) for RD20M(0)-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 RD20M(0)-T1B-A reliable?
The price and inventory of RD20M(0)-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 RD20M(0)-T1B-A is usually 5 days.
3.What payment methods are accepted for RD20M(0)-T1B-A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD20M(0)-T1B-A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD20M(0)-T1B-A?
RD20M(0)-T1B-A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD20M(0)-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 RD20M(0)-T1B-A?
For technical support, including RD20M(0)-T1B-A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD20M(0)-T1B-A requirements.
6.How does Aetrix verify that RD20M(0)-T1B-A is sourced from the original manufacturer or authorized distributors?
All RD20M(0)-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 RD20M(0)-T1B-A meets industry standards.
7.What is the process for return or replacement of RD20M(0)-T1B-A?
All RD20M(0)-T1B-A units undergo pre-shipment inspection (PSI). If there is an issue with RD20M(0)-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 RD20M(0)-T1B-A part is unused and in its original packaging.
Return procedure for RD20M(0)-T1B-A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
RD20M(0)-T1B-A Tags
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MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
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