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Renesas RD5.1FM-T1-AZ
- Part No.:
- RD5.1FM-T1-AZ
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
RD5.1FM-T1-AZ.pdf
- Description:
- DIODE ZENER 2-POWER MINI MOLD
- Quantity:
- Payment:
- Shipping:
Inventory:5,518
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Product details
Overview
RD5.1FM-T1-AZ from Renesas Electronics is a 1 W, 5.1 V Zener diode in a planar-type 2-pin power mini mold package (PMDM), designed for voltage regulation and surge suppression in low-power analog circuits, with ±5% Zener voltage tolerance (4.8–5.4 V at 5 mA), 100 Ω dynamic impedance, and 20 μA reverse leakage at 1.0 V.
For engineers reviewing the RD5.1FM-T1-AZ datasheet, RD5.1FM-T1-AZ pinout, RD5.1FM-T1-AZ application, or RD5.1FM-T1-AZ equivalent, this component serves as a precision shunt reference in power supply feedback loops, overvoltage clamping in sensor interfaces, and transient protection in industrial I/O modules - where stable 5.1 V regulation and compact surface-mount form factor are critical.
Technical Context
This Zener diode operates in reverse breakdown mode with a nominal Zener voltage of 5.1 V at 5 mA test current, exhibiting a typical temperature coefficient near 0 mV/°C in the 4.7–5.6 V range, enabling stable reference performance across ambient temperatures from −55°C to +150°C.
It delivers 1 W steady-state power dissipation on ceramic PCB (30 × 8 × 0.7 mm), supports 400 W surge reverse power for 10 μs pulses, and maintains junction temperature ≤150°C under rated conditions - making it suitable for intermittent overvoltage events in non-safety-critical industrial control systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 4.8–5.4 V at IZ = 5 mA - defines tight regulation window for 5 V rail monitoring and feedback sensing |
| Dynamic Impedance (ZZ) | 100 Ω max at IZ = 5 mA - ensures minimal output voltage shift under load variation in reference circuits |
| Reverse Leakage (IR) | 20 μA max at VR = 1.0 V - guarantees low quiescent current in always-on protection paths |
| Power Dissipation (P) | 1.0 W at TA = 25°C - enables use in space-constrained PCBs without forced cooling |
| Surge Reverse Power (PRSM) | 400 W for t = 10 μs - provides robust transient immunity against ESD and inductive kickback |
| Junction Temperature (Tj) | −55°C to +150°C - supports operation in extended-temperature industrial environments |
| Package | PMDM (2-pin planar power mini mold) - 4.7 × 2.5 × 1.55 mm footprint with cathode marking for automated optical inspection |
Pinout & Package
RD5.1FM-T1-AZ uses a 2-terminal PMDM package: Anode (pin 1) and Cathode (pin 2), with cathode identified by a molded band. The device is unidirectional and requires correct polarity for Zener operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; connected to lower-potential node in Zener regulation | Must be tied to ground or common return when used as shunt regulator; incorrect polarity prevents breakdown |
| Cathode | Current exit terminal in reverse breakdown; connected to regulated voltage node | Marked with band; connects to input rail or signal line requiring clamping - determines Zener orientation in layout |
Key Features
| Feature | Design Value |
|---|---|
| Planar construction | Enables high-reliability junction formation and consistent VZ distribution across production lots |
| Reduced mounting area | ~65% smaller footprint vs. legacy 3-pin RD**P series - saves PCB real estate in dense power management sections |
| Flat-surface mount capability | Two-pin geometry allows coplanar placement without lead bending - compatible with standard SMT reflow profiles |
| Class B Zener voltage tolerance | ±5% (4.8–5.4 V) - meets requirements for non-critical voltage references where cost and size outweigh ultra-tight tolerance needs |
| High surge robustness | 400 W peak pulse handling (10 μs) - protects downstream circuitry from short-duration transients without external TVS stacking |
Applications
| Industrial Sensor Signal Conditioning | 5 V LDO Feedback Reference |
|---|---|
|
Use Scenario: Stabilizing reference voltage for 12-bit ADC front-end in temperature/humidity transmitters operating in factory-floor environments. IC Role / Device Role / Timing Role: Shunt reference providing fixed 5.1 V node for op-amp biasing and ADC reference divider networks. Use Value: Maintains <±0.5% reference drift over −40°C to +85°C due to low tempco and 100 Ω ZZ, improving measurement repeatability. |
Use Scenario: Setting precise output voltage in adjustable 5 V linear regulators powering microcontroller peripherals. IC Role / Device Role / Timing Role: Zener element in feedback loop of TLV707-type LDOs to replace internal reference for tighter output accuracy. Use Value: Enables ±1% output regulation (vs. ±2% typical) without adding external ICs - reduces BOM count and layout complexity. |
| RS-485 Transceiver Bus Clamping | PLC Digital Input Protection |
|
Use Scenario: Protecting half-duplex RS-485 receiver inputs from induced surges on factory automation field wiring. IC Role / Device Role / Timing Role: Low-capacitance shunt clamp limiting differential bus voltage to ±5.1 V during EFT bursts. Use Value: Absorbs 400 W transients without latch-up, preserving signal integrity while avoiding parasitic capacitance penalties of TVS diodes. |
Use Scenario: Safeguarding 24 V DC digital input channels in programmable logic controllers exposed to relay coil flyback and lightning-induced surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed between input terminal and common, sinking fault current into series resistor. Use Value: Withstands repetitive 100 V/10 μs transients per IEC 61000-4-4 Level 3, extending channel lifetime without active crowbar circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX55C5V1 (ON Semiconductor) | Same 5.1 V nominal, 500 mW rating, DO-35 glass package - 50% lower power handling and larger footprint | Limited to low-power signal-level clamping; unsuitable for 1 W continuous dissipation scenarios | Select when board space permits larger package and thermal budget is constrained to ≤0.5 W |
| MMSZ5231B (Diodes Inc.) | 5.1 V, 500 mW, SOD-123 - higher ZZ (170 Ω), wider VZ tolerance (±5% same), but AEC-Q200 qualified | Approved for automotive body electronics; lacks 400 W surge rating and 150°C Tj | Choose for automotive-grade designs requiring qualification, not for industrial surge-heavy environments |
Compared with BZX55C5V1 and MMSZ5231B, RD5.1FM-T1-AZ uniquely combines 1 W continuous power, 400 W surge capability, and PMDM packaging - making it optimal for industrial power rails and I/O protection where thermal margin and transient resilience are prioritized over automotive qualification or ultra-low-cost commodity use.
Availability
RD5.1FM-T1-AZ is available at Aetrix Electronics and suitable for industrial sensor conditioning, PLC digital input protection, and RS-485 bus clamping requiring stable component supply and long-term manufacturability.
Supply support for RD5.1FM-T1-AZ 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 industrial, automotive, and infrastructure markets.
RD5.1FM-T1-AZ belongs to Renesas' legacy Zener diode family (RD2.0FM–RD120FM), engineered for high-density, cost-effective voltage regulation and transient suppression in standard-grade industrial equipment.
FAQ
What is the maximum continuous power dissipation of RD5.1FM-T1-AZ at 70°C ambient?
RD5.1FM-T1-AZ has a derated power dissipation of approximately 0.75 W at TA = 70°C, calculated using its 1 W rating at 25°C and thermal resistance profile from Figure 1 in the datasheet. This value assumes mounting on a 30 × 8 × 0.7 mm ceramic PCB. Exceeding this limit risks junction temperature exceeding 150°C, potentially degrading long-term reliability. Always verify thermal design with actual board layout and airflow conditions before finalizing.
Does RD5.1FM-T1-AZ support bidirectional transient suppression?
No, RD5.1FM-T1-AZ is a unidirectional Zener diode optimized for reverse-bias breakdown only. It conducts significantly in forward bias (typical VF ≈ 1.1 V at 200 mA), but offers no meaningful clamping in the forward direction. For bidirectional protection, RD5.1FM-T1-AZ must be paired with a series diode or used in conjunction with a complementary device - it is not a standalone TVS solution.
Is RD5.1FM-T1-AZ RoHS compliant and halogen-free?
Yes, RD5.1FM-T1-AZ conforms to EU RoHS Directive 2011/65/EU and is halogen-free per Renesas' environmental compliance documentation. The "-AZ" suffix explicitly denotes lead-free, RoHS-compliant termination and packaging. No exemptions apply, and full material declarations are available through Renesas' official product change notifications.
Can RD5.1FM-T1-AZ be used as a replacement for the older RD5.1P part?
Yes, RD5.1FM-T1-AZ is the direct successor to RD5.1P, sharing identical electrical specifications (VZ, IR, P, etc.) and functional role, but in a smaller 2-pin PMDM package versus the 3-pin power mini mold of RD5.1P. The reduced footprint (~65% smaller area) and flat-surface mount capability make RD5.1FM-T1-AZ preferable for new designs, though PCB layout revision is required due to different pin count and dimensions.
What is the typical Zener voltage temperature coefficient for RD5.1FM-T1-AZ?
The typical Zener voltage temperature coefficient for RD5.1FM-T1-AZ is approximately 0 mV/°C (or ~0.01%/°C), as shown in Figure 3(a) of the datasheet for the 4.7–5.6 V range. This near-zero tempco minimizes drift over temperature - a key advantage over lower-voltage Zeners (<4 V) with negative coefficients or higher-voltage devices (>6 V) with positive coefficients - making RD5.1FM-T1-AZ especially suitable for stable reference applications.
RD5.1FM-T1-AZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- DO-214AC, SMA
- 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-Power Mini Mold
RD5.1FM-T1-AZ FAQ
1.How can I place an order for RD5.1FM-T1-AZ through Aetrix?
Please submit a Request for Quotation (RFQ) for RD5.1FM-T1-AZ 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 RD5.1FM-T1-AZ reliable?
The price and inventory of RD5.1FM-T1-AZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RD5.1FM-T1-AZ is usually 5 days.
3.What payment methods are accepted for RD5.1FM-T1-AZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD5.1FM-T1-AZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD5.1FM-T1-AZ?
RD5.1FM-T1-AZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD5.1FM-T1-AZ 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 RD5.1FM-T1-AZ?
For technical support, including RD5.1FM-T1-AZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD5.1FM-T1-AZ requirements.
6.How does Aetrix verify that RD5.1FM-T1-AZ is sourced from the original manufacturer or authorized distributors?
All RD5.1FM-T1-AZ 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 RD5.1FM-T1-AZ meets industry standards.
7.What is the process for return or replacement of RD5.1FM-T1-AZ?
All RD5.1FM-T1-AZ units undergo pre-shipment inspection (PSI). If there is an issue with RD5.1FM-T1-AZ, 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 RD5.1FM-T1-AZ part is unused and in its original packaging.
Return procedure for RD5.1FM-T1-AZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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