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Renesas RD24UM-T1-AT
- Part No.:
- RD24UM-T1-AT
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- 2-SMD, Gull Wing
- Datasheet:
-
RD24UM-T1-AT.pdf
- Description:
- RD24UM-T1-AT - ZENER DIODES 2PIN
- Quantity:
- Payment:
- Shipping:
Inventory:90,000
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Product details
Overview
RD24UM-T1-AT from Renesas Electronics is a 2-pin Ultra Super Mini Mold zener diode with nominal zener voltage 24 V (B1 class: 22.86–24.03 V), 150 mW power dissipation, dynamic impedance ≤19 Ω at 5 mA, and reverse current ≤2 µA at 19 V, used for precision voltage reference and surge suppression in compact consumer power rails.
For engineers reviewing the RD24UM-T1-AT datasheet, RD24UM-T1-AT pinout, RD24UM-T1-AT application, or RD24UM-T1-AT equivalent, this page delivers verified electrical specs, package dimensions, thermal behavior, and real-world use cases - all confirmed against Renesas Data Sheet D13562EJ2V0DS00 (2nd ed., March 1999).
Technical Context
This zener diode operates in reverse breakdown mode with sharp knee characteristics per E24 standard voltage grading. Its B1 subclass guarantees tight VZ tolerance (±4.8% at 24 V) and low temperature coefficient (γZ ≈ +0.04 %/°C near 24 V), enabling stable regulation across ambient temperatures from –55 °C to +155 °C.
Designed for surface-mount assembly on ceramic or glass-epoxy PCBs, it supports transient surge handling up to 85 W (10 µs pulse) and maintains junction temperature ≤150 °C under rated DC conditions. The 2-pin USM package enables high-density layout while preserving thermal performance via defined PCB pad area requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 22.86–24.03 V (B1 class, tested at 5 mA; ensures ±4.8% tolerance for stable reference) |
| Power Dissipation P | 150 mW at TA = 25 °C (limits continuous bias current to ~6.25 mA at 24 V) |
| Dynamic Impedance ZZ | ≤19 Ω at IZ = 5 mA (low AC impedance improves regulation stability under load transients) |
| Reverse Current IR | ≤2 µA at VR = 19 V (ensures minimal leakage in standby or low-power hold circuits) |
| Junction Temperature Tj | 150 °C maximum (defines safe operating margin above ambient; requires thermal pad design) |
| Surge Power PRSM | 85 W at t = 10 µs (supports single-pulse ESD/surge clamping without failure) |
Pinout & Package
Ultra Super Mini Mold (USM) package: 2.1 × 1.3 × 0.7 mm body with cathode band marking; designed for reflow soldering on 10 × 7.5 mm ceramic or glass-epoxy PCB pads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower potential node; conducts when forward-biased >0.7 V |
| Cathode | Zener breakdown terminal | Marked with band; connected to higher potential node to enable reverse breakdown at VZ |
Key Features
| Feature | Design Value |
|---|---|
| Sharp Breakdown Knee | Enables precise voltage clamping with minimal voltage deviation over 1–10 mA operating range |
| E24 Standard VZ | Guarantees compatibility with standard resistor/voltage divider design practices and inventory planning |
| Low Dynamic Impedance | 19 Ω at 5 mA reduces output voltage variation under changing load currents |
| High Surge Withstand | 85 W pulse rating allows use as primary transient suppressor in low-energy signal/power lines |
Applications
| USB Port Overvoltage Protection | Microcontroller Reset Circuit Reference |
|---|---|
Use Scenario: Clamping 5 V USB VBUS line during hot-plug or ESD events. IC Role / Device Role / Timing Role: Zener diode acting as shunt regulator and transient absorber. Use Value: RD24UM-T1-AT's 85 W surge rating and 22.86–24.03 V VZ allow safe clamping of 24 V transients without damage, protecting downstream 5 V logic. | Use Scenario: Providing stable threshold voltage for RC-based reset generation in MCU power-up sequencing. IC Role / Device Role / Timing Role: Precision voltage reference defining reset release point. Use Value: RD24UM-T1-AT's ±4.8% VZ tolerance and low γZ ensure consistent reset timing across temperature and supply variance. |
| LED Driver Current Sense Clamp | Industrial Sensor Signal Conditioning |
Use Scenario: Limiting feedback voltage in constant-current LED driver to prevent overcurrent. IC Role / Device Role / Timing Role: Voltage clamp in op-amp feedback loop. Use Value: RD24UM-T1-AT's 150 mW rating and 19 Ω ZZ maintain accurate current regulation while absorbing loop transients. | Use Scenario: Protecting analog front-end inputs of 24 V industrial sensors from field-wiring surges. IC Role / Device Role / Timing Role: Primary overvoltage limiter before protection IC or ADC input. Use Value: RD24UM-T1-AT's 10 µs/85 W surge capability absorbs common-mode spikes without degrading sensor accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4749A | VZ = 24 V ±5%, P = 1 W, DO-41 package (5.2 × 2.7 mm) | Higher power but 5× larger footprint; unsuitable for ultra-dense layouts | Select RD24UM-T1-AT for space-constrained SMT designs; choose 1N4749A only if >150 mW continuous dissipation is required. |
| BZX55C24 | VZ = 24 V ±5%, P = 500 mW, DO-35 package (4.1 × 1.8 mm) | Larger than USM, higher ZZ (~30 Ω), no documented 10 µs surge rating | RD24UM-T1-AT offers superior surge robustness and smaller size; BZX55C24 may be used only where legacy through-hole compatibility is mandatory. |
Compared with 1N4749A and BZX55C24, RD24UM-T1-AT delivers identical 24 V regulation in a 2.1 × 1.3 mm USM package with verified 85 W transient capability - critical for modern miniaturized power management where board space and pulse immunity are jointly constrained.
Availability
RD24UM-T1-AT is available at Aetrix Electronics and suitable for USB interface protection, microcontroller reset circuits, LED driver feedback clamping, and industrial sensor input conditioning requiring stable component supply and RoHS-compliant packaging.
Supply support for RD24UM-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 Japanese semiconductor manufacturer formed in 2010 by merger of NEC Electronics and Renesas Technology, specializing in microcontrollers, analog, and power devices for industrial and consumer systems.
The RD2.0UM–RD39UM series was developed for compact, high-reliability voltage reference and transient suppression in space-limited consumer and industrial electronics - emphasizing tight VZ tolerance, low ZZ, and repeatable surge performance.
FAQ
What is the exact zener voltage range for RD24UM-T1-AT at 5 mA test current?
The RD24UM-T1-AT has a guaranteed zener voltage range of 22.86 V to 24.03 V when measured at IZ = 5 mA and TA = 25 °C, per its B1 classification in Renesas Data Sheet D13562EJ2V0DS00. This ±4.8% tolerance ensures predictable clamping behavior in precision reference applications.
Does RD24UM-T1-AT support surge suppression, and what is its peak pulse rating?
Yes, RD24UM-T1-AT is rated for 85 W surge reverse power at t = 10 µs (single pulse), as specified in Figure 6 of its official datasheet. This makes it suitable for ESD and short-duration transient suppression in low-energy signal and power lines without requiring external TVS diodes.
What is the maximum junction temperature and storage temperature range for RD24UM-T1-AT?
RD24UM-T1-AT has a maximum junction temperature (Tj) of 150 °C and a storage temperature range (Tstg) of –55 °C to +155 °C. These ratings allow operation in extended industrial environments, provided PCB thermal design maintains junction temperature within limit under 150 mW dissipation.
Is RD24UM-T1-AT RoHS compliant and lead-free?
Yes, RD24UM-T1-AT meets EU RoHS Directive requirements. Renesas confirms environmental compliance for this device family in accordance with applicable regulations, including restriction of lead, cadmium, mercury, hexavalent chromium, PBB, and PBDE - verified in product documentation and material declarations.
What package type and dimensions does RD24UM-T1-AT use?
RD24UM-T1-AT uses the 2-pin Ultra Super Mini Mold (USM) package measuring 2.1 ± 0.1 mm × 1.3 ± 0.1 mm × 0.7 ± 0.1 mm, with cathode indicated by a band. Its small footprint supports high-density SMT assembly on ceramic or glass-epoxy PCBs per Renesas recommended pad layout.
RD24UM-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
RD24UM-T1-AT FAQ
1.How can I place an order for RD24UM-T1-AT through Aetrix?
Please submit a Request for Quotation (RFQ) for RD24UM-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 RD24UM-T1-AT reliable?
The price and inventory of RD24UM-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 RD24UM-T1-AT is usually 5 days.
3.What payment methods are accepted for RD24UM-T1-AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD24UM-T1-AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD24UM-T1-AT?
RD24UM-T1-AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD24UM-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 RD24UM-T1-AT?
For technical support, including RD24UM-T1-AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD24UM-T1-AT requirements.
6.How does Aetrix verify that RD24UM-T1-AT is sourced from the original manufacturer or authorized distributors?
All RD24UM-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 RD24UM-T1-AT meets industry standards.
7.What is the process for return or replacement of RD24UM-T1-AT?
All RD24UM-T1-AT units undergo pre-shipment inspection (PSI). If there is an issue with RD24UM-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 RD24UM-T1-AT part is unused and in its original packaging.
Return procedure for RD24UM-T1-AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
RD24UM-T1-AT Tags
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