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Renesas RD43S-T1-A
- Part No.:
- RD43S-T1-A
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
RD43S-T1-A.pdf
- Description:
- DIODE ZENER 2-SUPER MINI MOLD
- Quantity:
- Payment:
- Shipping:
Inventory:15,000
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Product details
Overview
RD43S-T1-A from Renesas Electronics is a 200 mW, 40–45 V Zener diode in Super Mini Mold (SMD) package, designed for precision voltage regulation and surge suppression in low-power analog circuits. It features 130 Ω dynamic impedance at 2 mA zener current, ±5% zener voltage tolerance, and operates within –55°C to +150°C storage range. It is commonly used in overvoltage clamping for sensor signal conditioning and power rail stabilization.
For engineers reviewing the RD43S-T1-A datasheet, RD43S-T1-A pinout, RD43S-T1-A application, or RD43S-T1-A equivalent, this page delivers verified electrical specs, thermal behavior, package dimensions, real-world use cases, and validated alternative parts - all aligned with Renesas' D11444EJ6V0DS (6th ed., Aug. 2006) specification.
Technical Context
This Zener diode operates in reverse breakdown mode with sharp knee characteristics, enabling stable reference voltage generation under low-current conditions (IZ = 2 mA). Its 130 Ω dynamic impedance ensures minimal voltage deviation across load variations, while its 85 W non-repetitive surge rating (t = 10 μs) supports transient suppression in DC bias networks.
The device exhibits a positive temperature coefficient of ~0.095 %/°C (≈38 mV/°C) in the 40–45 V range, per Fig.10, making it suitable for temperature-compensated references when paired with negative-TC components. Its 2.5 mm × 1.7 mm × 1.25 mm Super Mini Mold package enables high-density PCB layouts without compromising thermal dissipation on standard FR-4 substrates.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 40.0–45.0 V at IZ = 2 mA - defines clamping threshold for overvoltage protection circuits. |
| Power Dissipation (P) | 200 mW at TA = 25°C - sets maximum continuous DC power handling on standard PCBs. |
| Dynamic Impedance (ZZ) | 130 Ω at IZ = 2 mA - determines output voltage variation under changing load current. |
| Reverse Current (IR) | ≤2 μA at VR = 33 V - ensures low leakage in high-impedance bias networks. |
| Surge Power (PRSM) | 85 W (10 μs pulse) - enables single-event transient suppression without failure. |
| Junction Temperature (Tj) | 150°C maximum - constrains thermal design margin for long-term reliability. |
| Package | Super Mini Mold (2-pin SMD) - 2.5 × 1.7 × 1.25 mm footprint compatible with 0805 reflow profiles. |
Pinout & Package
RD43S-T1-A uses a 2-pin Super Mini Mold package with cathode indicated by a band. The device has no active terminals beyond anode and cathode; polarity must be observed during placement to ensure proper reverse-bias operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Reference ground node | Connected to lower-potential side of circuit; forms return path during Zener conduction. |
| Cathode | Zener breakdown terminal / Voltage clamp node | Marked with band; connected to protected node to clamp voltage above 40 V. |
Key Features
| Feature | Design Value |
|---|---|
| Sharp breakdown characteristic | Enables precise 40–45 V clamping with minimal knee spread (<0.5 V), critical for tight-tolerance protection. |
| VZ compliant with E24 standard | Ensures interchangeability with other E24-series Zeners in voltage-reference ladder networks. |
| Low IR at VR = 33 V | ≤2 μA leakage preserves accuracy in high-impedance feedback paths (e.g., op-amp reference dividers). |
| 150°C max junction temperature | Supports operation in thermally constrained environments such as sealed industrial enclosures. |
Applications
| Industrial Sensor Signal Conditioning | Microcontroller I/O Protection |
|---|---|
Use Scenario: Protecting 3.3 V or 5 V ADC inputs from 24 V field transients in PLC analog modules. IC Role / Device Role / Timing Role: Zener clamp placed between input trace and ground to limit voltage excursion to ≤45 V before TVS activation. Use Value: Prevents latch-up in SAR ADCs by limiting fault energy below 85 W/10 μs, extending system MTBF. |
Use Scenario: Safeguarding GPIO pins against accidental 12 V supply misconnection in embedded control panels. IC Role / Device Role / Timing Role: Low-leakage (≤2 μA) shunt element that activates only above 40 V, leaving normal 0–5 V operation unaffected. Use Value: Eliminates need for series resistors >10 kΩ, preserving signal integrity and reducing BOM count. |
| DC Power Rail Stabilization | Reference Voltage Generation |
Use Scenario: Providing stable 43 V bias for photomultiplier tube (PMT) dynode chains in analytical instrumentation. IC Role / Device Role / Timing Role: Precision Zener acting as floating reference source with <±5% tolerance and low ZZ drift. Use Value: Maintains PMT gain stability within ±0.5% over 0–70°C ambient via predictable TC matching. |
Use Scenario: Generating temperature-stable reference for analog front-end comparators in battery management ICs. IC Role / Device Role / Timing Role: Paired with NTC thermistor to cancel TC; leverages 0.095 %/°C coefficient for compensation. Use Value: Achieves <±10 mV reference drift over –20°C to +85°C without trimming components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX55-C43 (ON Semiconductor) | Same 43 V nominal VZ, but 500 mW rating and DO-35 through-hole package. | Requires PCB layout change; higher power allows higher IZ but increases board area. | Choose for prototyping or legacy through-hole designs where thermal mass improves surge resilience. |
| MMSZ43ET1G (ON Semiconductor) | 43 V VZ, 500 mW, SOD-123 package (3.7 × 2.2 mm), 100 Ω ZZ at 5 mA. | Larger footprint and different thermal profile; optimized for higher-current regulation. | Prefer when operating at ≥5 mA and needing lower dynamic impedance than RD43S-T1-A's 130 Ω @ 2 mA. |
Compared with RD43S-T1-A, BZX55-C43 offers higher surge capacity but requires through-hole assembly, while MMSZ43ET1G delivers lower impedance at higher test current but occupies more PCB area - RD43S-T1-A remains optimal for space-constrained, low-IZ (<2 mA), 200 mW applications.
Availability
RD43S-T1-A is available at Aetrix Electronics and suitable for industrial sensor interfaces, microcontroller I/O protection, and DC power rail stabilization requiring stable component supply, RoHS-compliant sourcing, and long-lifecycle support.
Supply support for RD43S-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 Japanese semiconductor manufacturer formed in 2010 via merger of NEC Electronics and Renesas Technology, specializing in microcontrollers, analog, and power devices.
The RD43S-T1-A belongs to the RD2.0S–RD150S Zener diode family, engineered for compact, reliable voltage regulation and transient suppression in cost-sensitive industrial and consumer electronics.
FAQ
What is the exact zener voltage range for RD43S-T1-A?
The RD43S-T1-A has a guaranteed zener voltage range of 40.0 V to 45.0 V when tested at IZ = 2 mA, per Renesas datasheet D11444EJ6V0DS (6th edition, August 2006). This 5 V window reflects the B-class tolerance and aligns with E24 standard values. The typical nominal value is 43 V, but design margins must accommodate the full min/max span.
Does RD43S-T1-A support surface-mount reflow assembly?
Yes, RD43S-T1-A is qualified for standard SMD reflow processes. Its Super Mini Mold package (2.5 × 1.7 × 1.25 mm) is compatible with IPC/JEDEC J-STD-020 moisture sensitivity level (MSL) 1 and withstands peak reflow temperatures up to 260°C for 10 seconds, as confirmed by Renesas packaging specifications.
What is the maximum reverse leakage current for RD43S-T1-A?
The RD43S-T1-A exhibits ≤2 μA reverse leakage current (IR) at VR = 33 V and TA = 25°C, per the "ELECTRICAL CHARACTERISTICS" table in the official datasheet. This low leakage ensures minimal error in high-impedance reference or bias networks where current draw must remain sub-microampere.
Can RD43S-T1-A be used for surge protection in automotive applications?
RD43S-T1-A is rated for Standard quality grade per Renesas classification and is not qualified for automotive use. Its 200 mW power rating and 85 W transient capability meet industrial requirements but lack AEC-Q200 qualification, TS 16949 process controls, or extended temperature validation required for automotive ECUs or body electronics.
How does the temperature coefficient of RD43S-T1-A affect circuit performance?
RD43S-T1-A has a positive temperature coefficient of approximately 0.095 %/°C (≈38 mV/°C) in the 40–45 V range, per Figure 10 of the datasheet. This means its zener voltage increases linearly with temperature - useful for compensating negative-TC components (e.g., silicon sensors) but requiring derating in high-ambient environments above 70°C.
RD43S-T1-A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- SC-76, SOD-323
- 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-Super Mini Mold
RD43S-T1-A FAQ
1.How can I place an order for RD43S-T1-A through Aetrix?
Please submit a Request for Quotation (RFQ) for RD43S-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 RD43S-T1-A reliable?
The price and inventory of RD43S-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 RD43S-T1-A is usually 5 days.
3.What payment methods are accepted for RD43S-T1-A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD43S-T1-A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD43S-T1-A?
RD43S-T1-A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD43S-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 RD43S-T1-A?
For technical support, including RD43S-T1-A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD43S-T1-A requirements.
6.How does Aetrix verify that RD43S-T1-A is sourced from the original manufacturer or authorized distributors?
All RD43S-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 RD43S-T1-A meets industry standards.
7.What is the process for return or replacement of RD43S-T1-A?
All RD43S-T1-A units undergo pre-shipment inspection (PSI). If there is an issue with RD43S-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 RD43S-T1-A part is unused and in its original packaging.
Return procedure for RD43S-T1-A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
RD43S-T1-A Tags
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