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Renesas RD33S-T1-AT
- Part No.:
- RD33S-T1-AT
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
RD33S-T1-AT.pdf
- Description:
- DIODE ZENER 2-SUPER MINI MOLD
- Quantity:
- Payment:
- Shipping:
Inventory:59,255
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Product details
Overview
RD33S-T1-AT from Renesas Electronics is a 200 mW, 2-pin Super Mini Mold zener diode with a nominal zener voltage of 33 V (31.0–35.0 V at IZ = 2 mA), dynamic impedance of 80 Ω, and reverse current ≤2 μA at VR = 25 V - used for precision voltage regulation and surge suppression in low-power analog reference and protection circuits.
For engineers reviewing the RD33S-T1-AT datasheet, RD33S-T1-AT pinout, RD33S-T1-AT application, or RD33S-T1-AT equivalent, this page delivers verified electrical specs, thermal behavior, package dimensions, real-world use cases, and validated alternative parts - all confirmed from Renesas' official D11444EJ6V0DS data sheet (6th edition, August 2006).
Technical Context
This device operates as a two-terminal voltage-reference diode with sharp breakdown characteristics per E24 standard, optimized for constant-voltage biasing and waveform clamping in ambient temperatures up to +150°C junction temperature. Its 200 mW power dissipation rating is derated linearly above +25°C ambient per Fig.1 in the datasheet.
The RD33S-T1-AT exhibits a negative zener voltage temperature coefficient (~−0.04 %/°C or ~−13 mV/°C near 33 V) as shown in Fig.9–Fig.10, and supports non-repetitive surge reverse power up to 85 W for 10 μs pulses (Fig.12), making it suitable for transient overvoltage absorption in signal-line protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 31.0–35.0 V at IZ = 2 mA - defines stable regulation range under nominal test current. |
| Dynamic Impedance (ZZ) | 80 Ω max at IZ = 2 mA - determines output voltage variation under load current changes. |
| Reverse Current (IR) | ≤2 μA at VR = 25 V - ensures minimal leakage in off-state voltage-clamp applications. |
| Power Dissipation (P) | 200 mW at TA = 25°C - sets maximum continuous DC power handling on standard PCB. |
| Surge Power (PRSM) | 85 W for t = 10 μs (single pulse) - enables short-duration transient suppression without failure. |
| Junction Temperature (Tj) | −55 to +150°C - defines full operational thermal envelope for industrial-grade reliability. |
| Package | 2-pin Super Mini Mold (SOD-323 equivalent footprint) - 1.7 × 0.9 mm body, 0.3 mm lead pitch, cathode band marked. |
Pinout & Package
RD33S-T1-AT uses a 2-pin Super Mini Mold package (equivalent to JEDEC SOD-323), with cathode indicated by a band on one end. The device has no active control pins - anode and cathode terminals define unidirectional conduction and zener breakdown polarity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / reference ground node | Connected to lower-potential side in zener configuration; carries forward current up to 100 mA. |
| Cathode | Zener breakdown terminal / regulated output node | Marked with band; supplies stable voltage referenced to anode when reverse-biased above VZ. |
Key Features
| Feature | Design Value |
|---|---|
| Sharp breakdown characteristic | Enables precise voltage clamping with minimal knee voltage spread across production lots. |
| E24-standard zener voltage grading | Ensures predictable selection within 5% tolerance bands for design reuse and BOM rationalization. |
| 200 mW rated power in ultra-small package | Supports space-constrained PCB layouts while maintaining thermal margin for 70°C ambient operation. |
| Negative temperature coefficient (~−13 mV/°C) | Compensates for positive TC of other components in mixed-signal reference chains. |
| 85 W transient surge capability | Protects downstream ICs from ESD and inductive kickback without external TVS devices. |
Applications
| Low-Voltage Reference Supply | Signal-Line Surge Protection |
|---|---|
Use Scenario: Providing stable 33 V bias for op-amp input stages and ADC reference dividers in sensor signal conditioning modules. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to generate fixed reference voltage independent of supply ripple. Use Value: Delivers <±2% regulation accuracy with <80 Ω dynamic impedance, reducing drift-induced measurement error in 12-bit+ data acquisition systems. |
Use Scenario: Clamping RS-485 bus lines against ESD events and inductive transients in factory automation networks. IC Role / Device Role / Timing Role: Passive voltage clamp placed between differential pair and ground to limit common-mode overvoltage. Use Value: Absorbs 85 W surges for 10 μs without degradation, preventing latch-up or damage to transceiver ICs such as SN65HVD72. |
| Constant-Current Bias Generator | Waveform Clipper Circuit |
Use Scenario: Setting precise bias current for LED drivers and phototransistor amplifiers in optical isolation interfaces. IC Role / Device Role / Timing Role: Zener + series resistor forming a simple, temperature-compensated current source. Use Value: Maintains ±5% current stability over −40 to +85°C ambient due to matched TC behavior with silicon resistors. |
Use Scenario: Limiting audio signal peaks in microphone preamplifier inputs to prevent ADC saturation. IC Role / Device Role / Timing Role: Bidirectional clipping element (with series diode) shaping analog waveform amplitude. Use Value: Provides clean 33 V ceiling with fast response (<1 ns), preserving signal integrity while eliminating distortion from hard clipping. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5262B-7-F (Diodes Inc.) | 33 V nominal, 200 mW, SOT-23 package; 100 Ω ZZ, higher leakage (≤5 μA at 25 V) | Larger footprint; requires rework of pad layout; slightly looser regulation tolerance | Preferred where SOT-23 pick-and-place compatibility is required over SOD-323 board space savings |
| BZX584-C33 (Nexperia) | 33 V nominal, 200 mW, SOD-323 package; 90 Ω ZZ, tighter VZ tolerance (±5%), same IR | Identical footprint and mounting; minor VZ distribution shift improves yield in high-precision references | Drop-in replacement with improved statistical VZ consistency for metrology-grade designs |
Compared with RD33S-T1-AT, MMBZ5262B-7-F trades board space for assembly flexibility, while BZX584-C33 offers identical packaging with tighter VZ binning - enabling direct substitution where enhanced voltage repeatability is critical in calibration-critical subsystems.
Availability
RD33S-T1-AT is available at Aetrix Electronics and suitable for low-power voltage reference, signal-line protection, and analog biasing applications requiring stable component supply across industrial control, sensor interface, and embedded instrumentation programs.
Supply support for RD33S-T1-AT 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 connectivity solutions for automotive, industrial, and IoT markets.
RD33S-T1-AT belongs to the RD2.0S–RD150S zener diode family designed for compact, reliable voltage regulation and transient suppression in cost-sensitive, space-constrained consumer and industrial electronics.
FAQ
What is the zener voltage tolerance of RD33S-T1-AT?
The RD33S-T1-AT has a zener voltage range of 31.0 V to 35.0 V at IZ = 2 mA, corresponding to approximately ±6.1% tolerance about the nominal 33 V rating. This specification is explicitly defined in the "ELECTRICAL CHARACTERISTICS" table on page 5 of Renesas' D11444EJ6V0DS datasheet (6th edition, August 2006). The RD33S-T1-AT does not carry tighter binning codes like B1/B2/B3 - its classification is simply "Class B" per the datasheet.
Is RD33S-T1-AT RoHS compliant?
Yes, RD33S-T1-AT is RoHS compliant. Although the original datasheet predates the EU RoHS Directive's enforcement timeline, Renesas confirms environmental compliance for legacy products via material declarations and manufacturing process controls. The RD33S-T1-AT contains no lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE above threshold limits, and meets JEDEC J-STD-609A marking requirements for lead-free finish.
What is the maximum forward current rating for RD33S-T1-AT?
The absolute maximum forward current (IF) for RD33S-T1-AT is 100 mA, as specified in the "ABSOLUTE MAXIMUM RATINGS" table on page 2 of the D11444EJ6V0DS datasheet. This rating applies at TA = 25°C and assumes adequate PCB copper area for heat dissipation. Exceeding this value risks metallization failure or bond-wire lift-off, even if instantaneous power remains below 200 mW.
Can RD33S-T1-AT be used in place of a 33 V TVS diode?
No - RD33S-T1-AT is not rated or characterized as a transient voltage suppressor (TVS). While it withstands 85 W for 10 μs pulses (Fig.12), it lacks the clamping voltage consistency, peak pulse current rating, and standardized IEC 61000-4-2/4-4/4-5 performance validation required for certified TVS applications. For robust ESD protection, dedicated TVS devices such as PESD3V3L1BA should be used instead of RD33S-T1-AT.
What is the thermal resistance (RθJA) of RD33S-T1-AT on a standard PCB?
Renesas does not publish a single RθJA value for RD33S-T1-AT, but Fig.1 in the datasheet shows power derating curves for a 30 mm × 30 mm × 1.6 mm glass-epoxy PCB. At TA = 70°C, allowable power drops to ~130 mW - implying an effective RθJA ≈ 385°C/W (calculated from (150°C − 70°C)/0.200 W). This value is highly layout-dependent; actual thermal performance requires simulation or measurement with the target copper pour geometry.
RD33S-T1-AT 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
RD33S-T1-AT FAQ
1.How can I place an order for RD33S-T1-AT through Aetrix?
Please submit a Request for Quotation (RFQ) for RD33S-T1-AT 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 RD33S-T1-AT reliable?
The price and inventory of RD33S-T1-AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RD33S-T1-AT is usually 5 days.
3.What payment methods are accepted for RD33S-T1-AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD33S-T1-AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD33S-T1-AT?
RD33S-T1-AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD33S-T1-AT 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 RD33S-T1-AT?
For technical support, including RD33S-T1-AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD33S-T1-AT requirements.
6.How does Aetrix verify that RD33S-T1-AT is sourced from the original manufacturer or authorized distributors?
All RD33S-T1-AT 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 RD33S-T1-AT meets industry standards.
7.What is the process for return or replacement of RD33S-T1-AT?
All RD33S-T1-AT units undergo pre-shipment inspection (PSI). If there is an issue with RD33S-T1-AT, 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 RD33S-T1-AT part is unused and in its original packaging.
Return procedure for RD33S-T1-AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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