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Renesas RD4.7S-T1-A
- Part No.:
- RD4.7S-T1-A
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
RD4.7S-T1-A.pdf
- Description:
- DIODE ZENER 2-SUPER MINI MOLD
- Quantity:
- Payment:
- Shipping:
Inventory:134,136
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Product details
Overview
RD4.7S-T1-A from Renesas Electronics is a 200 mW, 2-pin Super Mini Mold zener diode with a nominal zener voltage of 4.7 V (4.40–4.92 V range at 5 mA), dynamic impedance ≤130 Ω, and reverse current ≤10 μA at 1.0 V. It delivers sharp breakdown characteristics and conforms to E24 standard voltage tolerance for precision voltage reference and clamping in low-power analog circuits.
For engineers reviewing the RD4.7S-T1-A datasheet, RD4.7S-T1-A pinout, RD4.7S-T1-A application, or RD4.7S-T1-A equivalent, this device is selected for stable 4.7 V regulation in space-constrained consumer and industrial power management, overvoltage protection, and waveform shaping where thermal derating above 25°C must be accounted for per its PD vs. TA curve.
Technical Context
This zener diode operates in reverse-biased breakdown mode with a specified test current of 5 mA and pulsed measurement (40 ms) for VZ. Its dynamic impedance is measured using a small AC signal superimposed on IZ, ensuring predictable regulation under varying load conditions.
The device features a cathode-indicated 2-pin SOD-323 package (2.5 mm × 1.25 mm), rated for junction temperatures up to 150°C and storage from –55°C to +150°C. Reverse surge power handling is 85 W for 10 μs single pulses, supporting transient suppression in low-energy signal paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 4.40–4.92 V at IZ = 5 mA - defines usable regulation window for 4.7 V reference design |
| Power Dissipation (PD) | 200 mW at TA = 25°C - requires thermal derating above ambient; full rating only on minimal copper |
| Dynamic Impedance (ZZ) | ≤130 Ω at IZ = 5 mA - determines output voltage variation under load current changes |
| Reverse Current (IR) | ≤10 μA at VR = 1.0 V - ensures low leakage in standby or high-impedance bias networks |
| Package | SOD-323 (2.5 × 1.25 mm) - surface-mount, cathode-marked, compatible with standard reflow profiles |
| Junction Temperature (Tj) | 150°C maximum - sets upper limit for thermal design margin in enclosed environments |
| Surge Power (PRSM) | 85 W for t = 10 μs (single pulse) - supports ESD/inductive spike absorption without failure |
Pinout & Package
RD4.7S-T1-A uses a 2-terminal SOD-323 package with cathode indicated by a band. No internal structure or multi-pin configuration applies - terminals are anode and cathode only.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / reference ground node in zener regulator | Connected to lower potential side; establishes reference point for regulated output |
| Cathode | Zener breakdown terminal / regulated output node | Marked with band; supplies stable voltage when reverse-biased above VZ |
Key Features
| Feature | Design Value |
|---|---|
| Sharp breakdown characteristic | Enables clean voltage clamping with minimal knee region spread - critical for precision threshold detection |
| E24-standard zener voltage grading | Ensures consistent binning across production lots for interchangeability in volume manufacturing |
| 200 mW power rating in SOD-323 | Delivers higher dissipation than typical 100–150 mW SOD-323 zeners - extends usable current range |
| Cathode polarity marking | Visible band enables unambiguous orientation during automated placement and visual inspection |
Applications
| USB Port Overvoltage Clamp | Microcontroller Reset Circuit Reference |
|---|---|
Use Scenario: Protecting USB data lines from accidental 5 V bus overvoltage events during hot-plug or ESD transients. IC Role / Device Role / Timing Role: Zener clamp referenced to ground, shunting excess voltage above 4.7 V before it reaches downstream PHY ICs. Use Value: Prevents latch-up or damage in 3.3 V tolerant USB transceivers while maintaining signal integrity below VZ. |
Use Scenario: Generating a stable 4.7 V threshold for a microcontroller's external reset supervisor circuit. IC Role / Device Role / Timing Role: Provides precise trip voltage to reset ICs like MAX809 or equivalent, ensuring deterministic boot behavior. Use Value: Eliminates need for external voltage divider; reduces BOM count and improves temperature stability vs. resistor-based references. |
| Low-Power Sensor Bias Network | Audio Signal Waveform Clipper |
Use Scenario: Biasing analog sensor outputs (e.g., thermistor bridges or op-amp sensors) requiring stable excitation voltage. IC Role / Device Role / Timing Role: Acts as shunt regulator in constant-current source configuration to maintain fixed bias point. Use Value: Delivers <10 μA leakage and <130 Ω dynamic impedance - minimizes sensor offset drift and noise coupling. |
Use Scenario: Limiting peak amplitude of line-level audio signals to prevent ADC saturation or amplifier clipping. IC Role / Device Role / Timing Role: Paired back-to-back with another zener or diode to symmetrically clip positive/negative signal excursions. Use Value: Sharp breakdown enables clean, repeatable clipping at ±4.7 V with minimal harmonic distortion in mid-frequency bands. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584-C4V7 (Nexperia) | Same 4.7 V nominal, 200 mW, SOD-323; tighter VZ tolerance (±5% vs. RD4.7S-T1-A's ±5.5%) | Higher production volume; RoHS-compliant lead finish differs (NiPdAu vs. RD4.7S-T1-A's matte Sn) | Preferred for new designs requiring extended lifecycle support and AEC-Q200 alignment |
| MMBZ5225BS (ON Semiconductor) | 4.7 V, 225 mW, SOD-323; lower ZZ (≤19 Ω) but higher IR (≤50 μA at 3.5 V) | Better regulation under dynamic loads; less suitable for ultra-low-leakage bias networks | Chosen when tighter voltage regulation under variable current is prioritized over leakage-critical operation |
Compared with RD4.7S-T1-A, BZX584-C4V7 offers tighter voltage binning and broader supply chain visibility, while MMBZ5225BS trades higher leakage for significantly lower dynamic impedance - making RD4.7S-T1-A optimal for cost-sensitive, thermally constrained applications needing balanced performance.
Availability
RD4.7S-T1-A is available at Aetrix Electronics and suitable for USB interface protection, microcontroller reset supervision, low-power sensor biasing, and audio signal conditioning requiring stable component supply and long-term obsolescence management.
Supply support for RD4.7S-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 leader formed in 2010 via merger of NEC Electronics and Renesas Technology, specializing in microcontrollers, analog, and power devices.
The RD2.0S to RD150S series was designed for general-purpose voltage regulation and transient suppression in cost-sensitive consumer and industrial electronics, emphasizing reliability in SOD-323 packaging.
FAQ
What is the exact zener voltage range for RD4.7S-T1-A at 5 mA?
The RD4.7S-T1-A has a guaranteed zener voltage range of 4.40 V to 4.92 V when tested at IZ = 5 mA and TA = 25°C using pulsed (40 ms) measurement. This range reflects the B-class tolerance per the D11444EJ6V0DS datasheet and aligns with E24 standard grading. The RD4.7S-T1-A does not specify tighter sub-bins (e.g., B1/B2/B3) in J-column data, so full B-range applies.
Is RD4.7S-T1-A RoHS compliant?
Yes, RD4.7S-T1-A meets RoHS Directive 2011/65/EU requirements. Renesas Electronics confirms compliance for this product family in official environmental documentation, with lead-free matte tin (Sn) termination and halogen-free molding compound. No exemptions apply, and the device carries the "RoHS Compliant" marking per Renesas' public compliance statements.
Can RD4.7S-T1-A replace a 5.1 V zener in a reset circuit?
No - RD4.7S-T1-A is not a functional replacement for a 5.1 V zener in reset circuits because its VZ range (4.40–4.92 V) does not overlap the minimum 4.82 V of the RD5.1S series. Using RD4.7S-T1-A would cause premature reset assertion. For 5.1 V functionality, RD5.1S-T1-A or equivalent must be used; RD4.7S-T1-A serves distinct 4.7 V reference needs.
What is the maximum allowable continuous reverse current for RD4.7S-T1-A?
The RD4.7S-T1-A is rated for a maximum forward current (IF) of 100 mA, but it is not intended for continuous forward conduction. In zener operation, continuous reverse current is limited by power dissipation: at 25°C ambient, IZ must stay ≤42.6 mA to maintain PD ≤200 mW (since VZ ≈ 4.7 V). Derating is required above 25°C per Fig.1 in the datasheet.
Does RD4.7S-T1-A have automotive qualification?
No, RD4.7S-T1-A is classified as a "Standard" quality grade device per Renesas' three-tier system and is intended for computers, office equipment, audio/video gear, and industrial robots - not automotive or safety-critical systems. It lacks AEC-Q200 stress testing and is not recommended for under-hood or ADAS applications without additional validation.
RD4.7S-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
RD4.7S-T1-A FAQ
1.How can I place an order for RD4.7S-T1-A through Aetrix?
Please submit a Request for Quotation (RFQ) for RD4.7S-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 RD4.7S-T1-A reliable?
The price and inventory of RD4.7S-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 RD4.7S-T1-A is usually 5 days.
3.What payment methods are accepted for RD4.7S-T1-A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD4.7S-T1-A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD4.7S-T1-A?
RD4.7S-T1-A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD4.7S-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 RD4.7S-T1-A?
For technical support, including RD4.7S-T1-A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD4.7S-T1-A requirements.
6.How does Aetrix verify that RD4.7S-T1-A is sourced from the original manufacturer or authorized distributors?
All RD4.7S-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 RD4.7S-T1-A meets industry standards.
7.What is the process for return or replacement of RD4.7S-T1-A?
All RD4.7S-T1-A units undergo pre-shipment inspection (PSI). If there is an issue with RD4.7S-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 RD4.7S-T1-A part is unused and in its original packaging.
Return procedure for RD4.7S-T1-A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
RD4.7S-T1-A Tags
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