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

Renesas RD5.1UM(0)-T1-A

Name: RD5.1UM(0)-T1-A
Brand: Renesas
SKU: RD5.1UM(0)-T1-A
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: RD5.1UM(0)-T1-A

Manufacturer:: Renesas

Category:: Single Zener Diodes

Package:: 2-SMD, Gull Wing

Datasheet:: RD5.1UM(0)-T1-A.pdf

Description:: RD5.1UM(0)-T1-A - ZENER DIODES 2

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Product details

Overview

RD5.1UM(0)-T1-A from Renesas Electronics is a 2-pin Ultra Super Mini Mold (USM) surface-mount zener diode with nominal zener voltage 5.1 V, 150 mW power dissipation, dynamic impedance ≤1.5 Ω at I_Z = 5 mA, and reverse current ≤5 µA at V_R = 3.8 V - used for precision voltage reference and transient suppression in compact DC-DC feedback loops.

For engineers reviewing the RD5.1UM(0)-T1-A datasheet, RD5.1UM(0)-T1-A pinout, RD5.1UM(0)-T1-A application, or RD5.1UM(0)-T1-A equivalent, key selection criteria include zener voltage tolerance (±5% for B1/B2/B3 variants), low dynamic impedance for stable regulation under load variation, USM package footprint compatibility with high-density PCB layouts, and surge capability up to 85 W (10 µs pulse).

Technical Context

This zener diode operates in reverse breakdown mode with sharp knee characteristics per E24 standard voltage grading. It is rated for junction temperature up to 150 °C and storage between –55 °C and +155 °C, supporting industrial ambient conditions.

Its 150 mW steady-state power rating is derated linearly above 25 °C ambient, and transient surge handling follows a defined thermal impedance curve (833 °C/W at t = 1 ms on glass epoxy PCB). The device exhibits a positive temperature coefficient of +0.04 %/°C near 5.1 V, minimizing drift in bias networks.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage V_Z	4.82–5.39 V (B1/B2/B3 grades); enables ±5% regulation window for 5 V rail monitoring and clamping
Power Dissipation P	150 mW at T_A = 25 °C; supports continuous operation in low-power sensor interfaces and logic-level protection
Dynamic Impedance Z_Z	≤1.5 Ω at I_Z = 5 mA; ensures minimal output voltage shift under varying load current in reference circuits
Reverse Current I_R	≤5 µA at V_R = 3.8 V; guarantees low leakage in high-impedance bias networks and battery-backed circuits
Surge Power P_RSM	85 W (10 µs pulse); provides robust ESD and line-transient immunity without external TVS staging
Junction Temperature T_j	150 °C maximum; allows reliable operation in enclosed enclosures or near heat-generating components

Pinout & Package

RD5.1UM(0)-T1-A uses the 2-pin Ultra Super Mini Mold (USM) package: 2.1 mm × 1.3 mm × 0.75 mm body with cathode marking. Mounting requires reflow-compatible solder profile per J-STD-020.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward conduction terminal / Reference ground node in shunt regulator	Connected to circuit ground or lower-potential node; defines current return path during zener operation
Cathode	Zener breakdown terminal / Regulated output node	Connected to voltage source or signal line being clamped; carries reverse current to maintain V_Z

Key Features

Feature	Design Value
Sharp breakdown knee	Enables clean transition into regulation with minimal voltage hysteresis, critical for accurate overvoltage detection
E24-standard zener voltage grading	Supports interoperability across design revisions and supplier alternatives without recalibration
Ultra Super Mini Mold (USM) package	Reduces PCB area by >40% vs. SOD-323; compatible with 0402-class pick-and-place and AOI inspection
150 mW power rating at 25 °C	Permits direct integration into microcontroller reset circuits and op-amp reference dividers without heatsinking
85 W surge capability (10 µs)	Withstands IEC 61000-4-2 Level 4 contact discharge without downstream protection components

Applications

Microcontroller Reset Circuit	ADC Reference Clamp
Use Scenario: Provides precise 5.1 V threshold for manual or power-on reset generation in 5 V MCU systems. IC Role / Device Role / Timing Role: Shunt voltage reference defining reset assertion level and hysteresis margin. Use Value: Tight V_Z tolerance (±5%) and low Z_Z ensure consistent reset timing across temperature and supply variance.	Use Scenario: Limits input voltage to 5 V ADC reference pins during hot-plug or ESD events. IC Role / Device Role / Timing Role: Fast-acting voltage clamp protecting precision analog front-end from overvoltage damage. Use Value: 85 W surge rating absorbs transients before internal ESD structures activate, preserving ADC accuracy and longevity.
Low-Power Sensor Bias Network	USB-C VBUS Overvoltage Protection
Use Scenario: Supplies stable 5.1 V bias to MEMS pressure sensors in battery-powered IoT nodes. IC Role / Device Role / Timing Role: Low-leakage zener reference replacing active regulators to extend battery life. Use Value: ≤5 µA reverse current at 3.8 V minimizes quiescent drain, enabling multi-year operation on coin cells.	Use Scenario: Clamps VBUS to safe levels during USB-C port negotiation faults or cable-induced surges. IC Role / Device Role / Timing Role: Primary overvoltage limiter upstream of USB PD controller and load switch. Use Value: USM footprint allows placement directly at connector pad, reducing trace inductance and improving clamping speed.

Microcontroller Reset Circuit

ADC Reference Clamp

Use Scenario: Provides precise 5.1 V threshold for manual or power-on reset generation in 5 V MCU systems.

IC Role / Device Role / Timing Role: Shunt voltage reference defining reset assertion level and hysteresis margin.

Use Value: Tight V_Z tolerance (±5%) and low Z_Z ensure consistent reset timing across temperature and supply variance.

Use Scenario: Limits input voltage to 5 V ADC reference pins during hot-plug or ESD events.

IC Role / Device Role / Timing Role: Fast-acting voltage clamp protecting precision analog front-end from overvoltage damage.

Use Value: 85 W surge rating absorbs transients before internal ESD structures activate, preserving ADC accuracy and longevity.

Low-Power Sensor Bias Network

USB-C VBUS Overvoltage Protection

Use Scenario: Supplies stable 5.1 V bias to MEMS pressure sensors in battery-powered IoT nodes.

IC Role / Device Role / Timing Role: Low-leakage zener reference replacing active regulators to extend battery life.

Use Value: ≤5 µA reverse current at 3.8 V minimizes quiescent drain, enabling multi-year operation on coin cells.

Use Scenario: Clamps VBUS to safe levels during USB-C port negotiation faults or cable-induced surges.

IC Role / Device Role / Timing Role: Primary overvoltage limiter upstream of USB PD controller and load switch.

Use Value: USM footprint allows placement directly at connector pad, reducing trace inductance and improving clamping speed.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX584-C5V1	150 mW SOD-523 package; V_Z = 5.1 V ±5%; Z_Z = 2.5 Ω @ 5 mA	Larger footprint (1.7 × 1.3 mm vs. USM's 2.1 × 1.3 mm); higher dynamic impedance	Preferred where SOD-523 is already standardized; less optimal for ultra-dense layouts requiring lowest Z_Z
MMSZ5231B	500 mW SOD-123 package; V_Z = 5.1 V ±5%; Z_Z = 17 Ω @ 20 mA	Higher power but larger size and higher Z_Z; not suitable for low-current precision references	Used when higher surge energy absorption is required beyond 85 W; unsuitable for <1 mA bias networks

Compared with BZX584-C5V1 and MMSZ5231B, RD5.1UM(0)-T1-A delivers the lowest dynamic impedance in the smallest USM footprint, making it optimal for space-constrained, low-current regulation where voltage stability under light loads is critical.

Availability

RD5.1UM(0)-T1-A is available at Aetrix Electronics and suitable for microcontroller reset circuits, ADC reference clamping, low-power sensor bias networks, and USB-C VBUS overvoltage protection requiring stable component supply and long-term obsolescence management.

Supply support for RD5.1UM(0)-T1-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 manufacturer specializing in microcontrollers, analog, and power devices for industrial, automotive, and consumer applications.

The RD2.0UM to RD39UM series was designed specifically for compact, high-reliability zener regulation in space-constrained portable and embedded systems where low leakage and sharp breakdown are essential.

FAQ

What is the exact zener voltage range for RD5.1UM(0)-T1-A?

The RD5.1UM(0)-T1-A has three graded variants: B1 (4.82–5.06 V), B2 (4.96–5.22 V), and B3 (5.12–5.39 V), all tested at I_Z = 5 mA and TA = 25 °C. The "(0)" suffix indicates the base variant without grade designation, and full specification requires confirming the B-grade marking on the device body or reel label. RD5.1UM(0)-T1-A must be selected per circuit tolerance requirements.

Does RD5.1UM(0)-T1-A support lead-free reflow soldering?

Yes, RD5.1UM(0)-T1-A is qualified for lead-free reflow per J-STD-020, with peak temperature up to 260 °C for 10 seconds. Its USM package uses matte tin plating and passes MSL Level 1 testing. Thermal profile must respect the 150 °C max junction temperature limit, and board layout should minimize copper pour under the device to avoid excessive heat accumulation during reflow. RD5.1UM(0)-T1-A is fully RoHS compliant.

Can RD5.1UM(0)-T1-A replace a 1N4733A in existing designs?

No - RD5.1UM(0)-T1-A is not a drop-in replacement for 1N4733A. While both regulate near 5.1 V, the 1N4733A is a 1 W through-hole device in DO-41 package, whereas RD5.1UM(0)-T1-A is a 150 mW surface-mount USM device. Substitution requires verifying power dissipation, thermal relief, PCB footprint, and surge handling. RD5.1UM(0)-T1-A is intended for low-power, high-density applications where the 1N4733A would be oversized and mechanically incompatible.

What is the maximum reverse surge energy RD5.1UM(0)-T1-A can absorb?

RD5.1UM(0)-T1-A is rated for 85 W surge reverse power at t = 10 µs (single pulse), corresponding to 850 µJ. This value derives from its transient thermal impedance curve and junction-to-case thermal resistance. For repetitive surges, derating is required per Fig. 6 in D13562EJ2V0DS00. RD5.1UM(0)-T1-A does not specify I_PP or clamping voltage under surge - it operates as a fixed-V_Z clamp, not a dynamic TVS.

Is RD5.1UM(0)-T1-A suitable for automotive applications?

RD5.1UM(0)-T1-A is classified as "Standard" quality grade per Renesas documentation and is rated for industrial temperature range (–55 °C to +155 °C), but it is not AEC-Q200 qualified. It is approved for computers, office equipment, communications gear, and industrial robots - not for automotive powertrain, chassis, or safety-critical systems. For automotive use, Renesas offers AEC-Q200-qualified zener families such as the RZ series; RD5.1UM(0)-T1-A should not be deployed in vehicle ECUs without formal qualification.

RD5.1UM(0)-T1-A 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

RD5.1UM(0)-T1-A FAQ

1.How can I place an order for RD5.1UM(0)-T1-A through Aetrix?

Please submit a Request for Quotation (RFQ) for RD5.1UM(0)-T1-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 RD5.1UM(0)-T1-A reliable?

The price and inventory of RD5.1UM(0)-T1-A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RD5.1UM(0)-T1-A is usually 5 days.

3.What payment methods are accepted for RD5.1UM(0)-T1-A?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD5.1UM(0)-T1-A transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for RD5.1UM(0)-T1-A?

RD5.1UM(0)-T1-A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your RD5.1UM(0)-T1-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 RD5.1UM(0)-T1-A?

For technical support, including RD5.1UM(0)-T1-A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD5.1UM(0)-T1-A requirements.

6.How does Aetrix verify that RD5.1UM(0)-T1-A is sourced from the original manufacturer or authorized distributors?

All RD5.1UM(0)-T1-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 RD5.1UM(0)-T1-A meets industry standards.

7.What is the process for return or replacement of RD5.1UM(0)-T1-A?

All RD5.1UM(0)-T1-A units undergo pre-shipment inspection (PSI). If there is an issue with RD5.1UM(0)-T1-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 RD5.1UM(0)-T1-A part is unused and in its original packaging.

Return procedure for RD5.1UM(0)-T1-A:

1.Submit a request within 90 days.

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

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