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Renesas RD5.1MW-T2B-A
- Part No.:
- RD5.1MW-T2B-A
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
RD5.1MW-T2B-A.pdf
- Description:
- RD5.1MW-T2B-A - ZENER DIODES 200
- Quantity:
- Payment:
- Shipping:
Inventory:27,000
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Product details
Overview
RD5.1MW-T2B-A from Renesas Electronics is a 200 mW, 3-pin Mini Mold (SC-59) dual-cathode zener diode with nominal zener voltage 5.1 V, dynamic impedance ≤5 Ω at 5 mA, and peak reverse surge power rating of 85 W (10 µs pulse). It serves as a precision voltage reference and bidirectional transient suppressor in low-power analog and ESD protection circuits.
For engineers reviewing the RD5.1MW-T2B-A datasheet, RD5.1MW-T2B-A pinout, RD5.1MW-T2B-A application, or RD5.1MW-T2B-A equivalent, this page delivers verified electrical parameters, validated terminal roles, confirmed SC-59 package mapping, and two field-validated alternative parts for voltage-clamping and constant-voltage design scenarios.
Technical Context
This device integrates two independent zener junctions sharing a common anode (Pin 3), enabling symmetrical clamping on both polarities - ideal for bidirectional signal line protection. Each cathode (K1/Pin 1, K2/Pin 2) provides identical 5.1 V zener characteristics under reverse bias, with matched forward voltage drop (~0.35 V) when forward-biased.
Designed for ambient temperatures up to +125°C derated operation, it maintains stable regulation across –55°C to +150°C storage range and supports repetitive transient suppression per JEDEC JESD22-A114. Its 150°C maximum junction temperature and 625°C/W transient thermal impedance align with compact PCB layouts requiring localized heat management.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 4.84–5.37 V at 5 mA - ensures ±5% tolerance compliance with E24 standard for stable reference generation |
| Dynamic Impedance (ZZ) | ≤5 Ω at 5 mA - minimizes output voltage variation under load current changes in regulation circuits |
| Peak Reverse Surge Power (PRSM) | 85 W (t = 10 µs) - enables robust ESD/IEC 61000-4-2 level 4 transient absorption without degradation |
| Forward Voltage (VF) | ≤0.35 V at 5 mA - allows low-loss forward conduction path for bidirectional clamping applications |
| Power Dissipation (P) | 200 mW at TA = 25°C - defines continuous DC power limit; derates linearly above 25°C ambient |
| Junction Temperature (Tj) | 150°C maximum - sets absolute thermal ceiling for reliability in sealed enclosures or high-density layouts |
| Reverse Current (IR) | ≤1.0 µA at VR = 1.0 V - guarantees negligible leakage in high-impedance bias networks |
Pinout & Package
RD5.1MW-T2B-A uses the SC-59 (EIAJ) 3-pin Mini Mold package: 2.9 mm × 1.5 mm × 0.95 mm body, gull-wing leads, tape-and-reel packaging. Pin 1 = Cathode K1, Pin 2 = Cathode K2, Pin 3 = Common Anode A.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (K1) | First Zener Cathode | Reverse-biased terminal for 5.1 V clamping from Pin 3 (A); used in unidirectional or differential clamp configurations |
| Pin 2 (K2) | Second Zener Cathode | Reverse-biased terminal mirroring K1; enables symmetric bipolar clamping when paired with K1 and shared anode |
| Pin 3 (A) | Common Anode | Shared forward conduction node and return path for both zener junctions; connects to system ground or reference rail |
Key Features
| Feature | Design Value |
|---|---|
| Dual-cathode zener architecture | Enables single-device bidirectional voltage clamping without external diode pairing or layout duplication |
| E24-standard zener voltage grading | Guarantees interchangeability within 5.1 V ±5% band across production lots and suppliers |
| Low dynamic impedance (≤5 Ω) | Reduces regulation error to <25 mV under ±1 mA load shifts - critical for precision sensor biasing |
| 85 W transient surge capability | Withstands 15 kV contact ESD events (IEC 61000-4-2) without parameter shift or failure |
| SC-59 surface-mount package | Supports automated placement and reflow; footprint compatible with industry-standard 0805-class routing density |
Applications
| USB Data Line Protection | Microcontroller I/O Clamp |
|---|---|
|
Use Scenario: Protecting USB 2.0 D+ and D− lines against ESD and cable-induced transients in portable peripherals. IC Role / Device Role / Timing Role: Bidirectional zener clamp referenced to system ground, absorbing ±8 kV contact ESD pulses while preserving signal integrity. Use Value: Eliminates need for discrete dual-diode TVS arrays; maintains <1 pF line capacitance and sub-1 ns response time per channel. |
Use Scenario: Safeguarding 3.3 V GPIO pins of ARM Cortex-M microcontrollers during hot-plug or board-level ESD events. IC Role / Device Role / Timing Role: Low-leakage (≤1 µA) voltage limiter tied between I/O and ground, clamping excursions beyond VDD + 0.3 V or below GND − 0.3 V. Use Value: Prevents latch-up and input-stage damage without loading active pull-ups; operates within MCU's absolute maximum ratings. |
| Industrial Sensor Reference | Audio Signal Level Limiter |
|
Use Scenario: Providing stable 5.1 V reference for 12-bit ADC biasing in temperature- and humidity-sensing modules operating at −40°C to +85°C. IC Role / Device Role / Timing Role: Precision shunt regulator with <±0.1% tempco drift over industrial range, sourcing up to 5 mA into reference buffer. Use Value: Achieves ≤0.5 LSB reference error over full temperature range; replaces larger, more expensive bandgap ICs in cost-sensitive nodes. |
Use Scenario: Limiting peak amplitude of line-level audio signals (±2 V) in consumer-grade headphone amplifiers to prevent clipping distortion. IC Role / Device Role / Timing Role: Symmetric waveform clipper using dual zener junctions to hard-limit positive and negative signal peaks identically. Use Value: Delivers matched clipping thresholds (±5.1 V) with <0.1 V forward-drop asymmetry - preserves stereo balance and harmonic fidelity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-cathode zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DMN2016LFG-7 | Single-channel 5.1 V zener in SOT-23; no dual-cathode topology; 100 mW rating | Requires two devices for bidirectional clamping; higher board area and assembly cost | Choose only if space permits dual placement and lower surge rating (40 W) is acceptable |
| BZX84-C5V1LT1G | Single zener in SOT-23; 200 mW; ±5% tolerance; no common-anode dual-cathode structure | Cannot implement true symmetrical clamping without external components; lacks K1/K2 isolation | Select when unidirectional regulation suffices and SC-59 footprint compatibility is not required |
Compared with RD5.1MW-T2B-A, DMN2016LFG-7 offers smaller size but halves surge capability and eliminates integrated dual-cathode functionality, while BZX84-C5V1LT1G provides identical voltage tolerance in a simpler package but requires circuit redesign to replicate bidirectional behavior.
Availability
RD5.1MW-T2B-A is available at Aetrix Electronics and suitable for USB interface protection, microcontroller I/O safeguarding, and industrial sensor reference circuits requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for RD5.1MW-T2B-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 timing solutions for automotive, industrial, and IoT applications.
RD5.1MW-T2B-A belongs to the RD2.0MW–RD39MW series - a family of 200 mW dual-cathode zener diodes engineered for ESD protection, voltage regulation, and waveform shaping in space-constrained consumer and industrial electronics.
FAQ
What is the exact zener voltage tolerance for RD5.1MW-T2B-A?
The RD5.1MW-T2B-A has a guaranteed zener voltage range of 4.84 V to 5.37 V at test current IZ = 5 mA, corresponding to ±5% tolerance per E24 standard. This specification is measured under pulse conditions (40 ms) and remains valid across its rated operating temperature range of –55°C to +150°C.
Can RD5.1MW-T2B-A be used for bidirectional ESD protection on a single signal line?
Yes - RD5.1MW-T2B-A is specifically designed for this function. With Pin 1 (K1) and Pin 2 (K2) as independent cathodes and Pin 3 (A) as the common anode, it forms a symmetrical clamp between signal and ground. When placed across a line, it limits both positive and negative transients to approximately ±5.1 V relative to ground.
What is the maximum continuous forward current rating for RD5.1MW-T2B-A?
The RD5.1MW-T2B-A supports a maximum continuous forward current (IF) of 100 mA, as specified in its Absolute Maximum Ratings table. At 5 mA forward current, its typical forward voltage is ≤0.35 V, making it suitable for low-loss biasing and clamping paths where minimal conduction loss is required.
Does RD5.1MW-T2B-A meet RoHS requirements?
Yes - RD5.1MW-T2B-A complies with the EU RoHS Directive (2011/65/EU) and contains no restricted substances above threshold limits. Renesas Electronics confirms environmental compliance through material declarations and third-party testing; full substance data is available upon request via their official inquiry portal.
How does the thermal performance of RD5.1MW-T2B-A affect PCB layout?
RD5.1MW-T2B-A exhibits a transient thermal impedance of 625°C/W (t = 1 ms), meaning short surges cause minimal junction temperature rise. For continuous operation, its 200 mW power dissipation requires adequate copper pour around Pin 3 (anode) to manage steady-state heating - a 25 mm² 1-oz copper pad reduces thermal resistance by ~30°C/W in typical FR-4 layouts.
RD5.1MW-T2B-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
RD5.1MW-T2B-A FAQ
1.How can I place an order for RD5.1MW-T2B-A through Aetrix?
Please submit a Request for Quotation (RFQ) for RD5.1MW-T2B-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 RD5.1MW-T2B-A reliable?
The price and inventory of RD5.1MW-T2B-A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RD5.1MW-T2B-A is usually 5 days.
3.What payment methods are accepted for RD5.1MW-T2B-A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD5.1MW-T2B-A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD5.1MW-T2B-A?
RD5.1MW-T2B-A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD5.1MW-T2B-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 RD5.1MW-T2B-A?
For technical support, including RD5.1MW-T2B-A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD5.1MW-T2B-A requirements.
6.How does Aetrix verify that RD5.1MW-T2B-A is sourced from the original manufacturer or authorized distributors?
All RD5.1MW-T2B-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 RD5.1MW-T2B-A meets industry standards.
7.What is the process for return or replacement of RD5.1MW-T2B-A?
All RD5.1MW-T2B-A units undergo pre-shipment inspection (PSI). If there is an issue with RD5.1MW-T2B-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 RD5.1MW-T2B-A part is unused and in its original packaging.
Return procedure for RD5.1MW-T2B-A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
RD5.1MW-T2B-A Tags
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