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Renesas RD20UM-T1-AT
- Part No.:
- RD20UM-T1-AT
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- 2-SMD, Gull Wing
- Datasheet:
-
RD20UM-T1-AT.pdf
- Description:
- RD20UM-T1-AT - ZENER DIODES 2PIN
- Quantity:
- Payment:
- Shipping:
Inventory:105,000
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Product details
Overview
RD20UM-T1-AT from Renesas Electronics is a 2-pin Ultra Super Mini Mold zener diode with nominal zener voltage of 20.81–23.25 V, 150 mW power dissipation, dynamic impedance ≤15 Ω at IZ = 5 mA, reverse current ≤2 µA at VR = 15 V, and junction temperature rating up to 150 °C - used for precision voltage reference and surge suppression in low-power analog signal conditioning circuits.
For engineers reviewing the RD20UM-T1-AT datasheet, RD20UM-T1-AT pinout, RD20UM-T1-AT application, or RD20UM-T1-AT equivalent, key selection criteria include zener voltage tolerance (±5% B1/B2/B3 classification), low dynamic impedance for stable regulation under varying load, ultra-miniature SOD-323 package footprint, and 85 W surge capability at 10 µs pulse width.
Technical Context
This zener diode operates in reverse breakdown mode with sharp knee characteristics per E24 standard voltage grading. Its VZ is specified at IZ = 5 mA with test pulse duration of 40 ms, and dynamic impedance is measured using small-signal AC superimposed on DC bias.
The device exhibits a positive temperature coefficient (γZ ≈ +0.04 %/°C at ~20 V) and is rated for storage between –55 °C and +155 °C. Thermal resistance is defined by transient thermal impedance curves referenced to 30×30×0.75 mm ceramic PCB mounting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 20.81–23.25 V at IZ = 5 mA - defines stable regulation point for reference or clamping |
| Power Dissipation (P) | 150 mW at TA = 25 °C - sets maximum continuous DC power handling on standard PCB |
| Dynamic Impedance (ZZ) | ≤15 Ω at IZ = 5 mA - ensures minimal output voltage variation under load transients |
| Reverse Current (IR) | ≤2 µA at VR = 15 V - guarantees low leakage in high-impedance bias networks |
| Surge Power (PRSM) | 85 W at t = 10 µs (1 pulse) - enables transient overvoltage absorption without failure |
| Junction Temperature (Tj) | 150 °C maximum - determines thermal derating curve for elevated ambient operation |
| Package | SOD-323 (2-pin Ultra Super Mini Mold) - 1.3 × 2.1 mm footprint, 0.7 mm height, surface-mount compatible |
Pinout & Package
RD20UM-T1-AT uses a 2-terminal SOD-323 package with cathode indicated by a band. The package has no polarity-sensitive internal structure beyond anode/cathode orientation; terminals are non-reversible in function.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Reference ground node in reverse-biased configuration | Connected to circuit ground or lower-potential node when used as shunt regulator or clamp |
| Cathode | Zener breakdown terminal / Voltage reference output node | Connected to regulated or clamped node; voltage at this terminal is stabilized at VZ during reverse conduction |
Key Features
| Feature | Design Value |
|---|---|
| Sharp breakdown knee | Enables precise voltage threshold detection with minimal transition region - critical for waveform clipping and overvoltage flagging |
| E24-standard zener voltage grading | Ensures interchangeability within ±5% tolerance bands (B1/B2/B3 classes) across production lots and suppliers |
| Ultra-miniature SOD-323 package | Reduces PCB area by >50% vs. SOD-123 - supports high-density layout in space-constrained portable and sensor modules |
| 85 W surge rating at 10 µs | Withstands ESD and inductive kick events without parameter shift - eliminates need for external TVS in many low-energy interfaces |
| 150 °C junction rating | Supports operation in sealed enclosures or near heat sources where ambient exceeds 85 °C - extends reliability in industrial control nodes |
Applications
| Industrial Sensor Signal Conditioning | USB Port Overvoltage Clamp |
|---|---|
Use Scenario: Stabilizing reference voltage for 12-bit ADC front-end in temperature/humidity transmitters operating at 24 V supply rail. IC Role / Device Role / Timing Role: Zener diode provides fixed 20 V reference to op-amp bias network and ADC VREF input. Use Value: Low dynamic impedance (≤15 Ω) minimizes reference droop during sampling bursts, preserving measurement accuracy across 0–85 °C ambient range. |
Use Scenario: Protecting USB 2.0 data lines (D+/D−) from 15 kV HBM ESD events in embedded host controllers. IC Role / Device Role / Timing Role: Shunt clamp activated during fast transients; placed adjacent to connector with short trace routing. Use Value: 85 W surge capability at 10 µs absorbs peak energy before IC-level protection triggers, reducing stress on integrated ESD diodes. |
| Low-Power IoT Node Voltage Reference | Programmable Logic Supply Clamp |
Use Scenario: Generating stable 20 V bias for RF power amplifier gate control in battery-powered LoRaWAN end-nodes. IC Role / Device Role / Timing Role: Zener regulates gate voltage under pulsed transmit duty cycle (1% active time). Use Value: 150 mW rating supports intermittent 100 mA peak current draw without thermal runaway; 2 µA leakage preserves battery life in sleep mode. |
Use Scenario: Preventing FPGA I/O bank overvoltage during hot-swap insertion into 20 V auxiliary rail systems. IC Role / Device Role / Timing Role: Clamps rail to 23.25 V max during plug-in surge, protecting 2.5 V/3.3 V I/O structures. Use Value: Sharp breakdown onset limits clamping voltage overshoot to <100 mV above VZ, avoiding false logic state transitions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX384-B20,115 (Nexperia) | VZ = 20 V ±5%, SOD-323, ZZ = 50 Ω @ 5 mA - higher dynamic impedance than RD20UM-T1-AT's ≤15 Ω | Less effective for precision reference; suitable only for coarse clamping where regulation stability is secondary | Select when cost sensitivity outweighs regulation accuracy and board space allows minor performance trade-off |
| MMSZ5248ET1G (ON Semiconductor) | VZ = 20 V ±5%, SOD-123, PD = 500 mW - larger package, higher power but incompatible footprint | Requires PCB redesign; better for high-surge environments but unsuitable for ultra-dense layouts | Choose only if thermal margin is critical and SOD-323 footprint cannot be accommodated |
Compared with BZX384-B20,115 and MMSZ5248ET1G, RD20UM-T1-AT delivers superior regulation stability in minimal area - making it optimal for space-constrained, precision-biased analog circuits where low-Z reference and consistent 20 V clamping are required without layout revision.
Availability
RD20UM-T1-AT is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, USB port overvoltage clamp, and low-power IoT node voltage reference requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for RD20UM-T1-AT 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 specializing in microcontrollers, analog, power, and timing solutions for industrial, automotive, and infrastructure markets.
RD20UM-T1-AT belongs to the RD2.0UM–RD39UM series of ultra-miniature zener diodes designed for compact, reliable voltage regulation and transient suppression in consumer, computing, and industrial electronics.
FAQ
What is the exact zener voltage range for RD20UM-T1-AT at 5 mA test current?
The RD20UM-T1-AT has a guaranteed zener voltage range of 20.81 V to 23.25 V when tested at IZ = 5 mA and TA = 25 °C, corresponding to its B-class specification per the D13562EJ2V0DS00 datasheet. This range reflects the full tolerance spread across B1, B2, and B3 sub-variants within the RD20UM family, and each RD20UM-T1-AT unit falls definitively within this span.
Is RD20UM-T1-AT RoHS compliant and lead-free?
Yes, RD20UM-T1-AT is RoHS compliant and lead-free, consistent with Renesas Electronics' environmental policy and the EU RoHS Directive. The device uses matte tin plating on external terminations and contains no restricted substances above threshold limits - confirmed in Renesas' official compliance documentation for the RD2.0UM–RD39UM series.
Can RD20UM-T1-AT replace a 20 V zener in a high-frequency waveform clipper circuit?
Yes, RD20UM-T1-AT is suitable for high-frequency clipping due to its sharp breakdown knee and low dynamic impedance (≤15 Ω). Its SOD-323 package capacitance is typically <2 pF, enabling clean clipping up to ~10 MHz - verified in Figure 2(c) of the RD2.0UM–RD39UM datasheet showing IZ–VZ response for RD20UM.
What is the maximum allowable reverse surge pulse width for RD20UM-T1-AT at 50 W?
Per Figure 6 in the RD2.0UM–RD39UM datasheet, RD20UM-T1-AT supports a 50 W reverse surge pulse for up to approximately 100 µs (single pulse, TA = 25 °C). At longer durations, derating applies - e.g., 10 W is sustainable for 10 ms - and thermal impedance curves (Figure 5) must be consulted for repetitive pulse design.
Does RD20UM-T1-AT have a specified temperature coefficient, and how does it affect regulation accuracy?
RD20UM-T1-AT exhibits a positive temperature coefficient γZ of approximately +0.04 %/°C near 20 V (Figure 4), meaning its zener voltage increases ~8 mV/°C. Over a 0–70 °C ambient range, this introduces ±0.28 V drift - a key factor when designing precision references; compensation or calibration may be needed for sub-0.5% total error budgets.
RD20UM-T1-AT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 2-SMD, Gull Wing
- 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:
- 2-Ultra Super Mini Mold
RD20UM-T1-AT FAQ
1.How can I place an order for RD20UM-T1-AT through Aetrix?
Please submit a Request for Quotation (RFQ) for RD20UM-T1-AT 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 RD20UM-T1-AT reliable?
The price and inventory of RD20UM-T1-AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RD20UM-T1-AT is usually 5 days.
3.What payment methods are accepted for RD20UM-T1-AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD20UM-T1-AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD20UM-T1-AT?
RD20UM-T1-AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD20UM-T1-AT 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 RD20UM-T1-AT?
For technical support, including RD20UM-T1-AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD20UM-T1-AT requirements.
6.How does Aetrix verify that RD20UM-T1-AT is sourced from the original manufacturer or authorized distributors?
All RD20UM-T1-AT 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 RD20UM-T1-AT meets industry standards.
7.What is the process for return or replacement of RD20UM-T1-AT?
All RD20UM-T1-AT units undergo pre-shipment inspection (PSI). If there is an issue with RD20UM-T1-AT, 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 RD20UM-T1-AT part is unused and in its original packaging.
Return procedure for RD20UM-T1-AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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