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Renesas RD120S-T1-AT
- Part No.:
- RD120S-T1-AT
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
RD120S-T1-AT.pdf
- Description:
- DIODE ZENER 2-SUPER MINI MOLD
- Quantity:
- Payment:
- Shipping:
Inventory:39,000
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Product details
Overview
RD120S-T1-AT from Renesas Electronics is a 200 mW, 2-pin Super Mini Mold zener diode with a nominal zener voltage of 120 V (min 114.0 V, max 126.0 V at IZ = 1 mA), dynamic impedance of 900 Ω, and reverse current ≤0.2 μA at VR = 91 V. It serves as a precision voltage reference and overvoltage clamp in low-power industrial power supply monitoring circuits.
For engineers reviewing the RD120S-T1-AT datasheet, RD120S-T1-AT pinout, RD120S-T1-AT application, or RD120S-T1-AT equivalent, this device is selected for stable 120 V regulation in space-constrained PCB layouts requiring high-voltage tolerance, low leakage, and sharp breakdown characteristics in constant-voltage and surge-absorption roles.
Technical Context
This zener diode operates in reverse-biased breakdown mode with a specified test current of 1 mA, delivering tight voltage control across its rated range. Its 900 Ω dynamic impedance ensures minimal voltage deviation under small-signal load variations, supporting stable reference performance in feedback networks.
The device features a negative temperature coefficient above ~6 V - confirmed at +0.095 %/°C for RD120S - enabling predictable thermal drift compensation in fixed-bias configurations. Its 85 W non-repetitive surge rating (t = 10 μs) provides transient overvoltage resilience without derating in pulse-limited protection circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 114.0 V to 126.0 V at IZ = 1 mA - defines usable regulation window for 120 V nominal systems |
| Dynamic Impedance (ZZ) | 900 Ω at IZ = 1 mA - indicates moderate AC resistance affecting regulation accuracy under varying loads |
| Reverse Current (IR) | ≤0.2 μA at VR = 91 V - ensures negligible standby leakage in high-impedance sensing paths |
| Power Dissipation (P) | 200 mW at TA = 25°C - sets maximum continuous DC power handling on standard FR-4 PCB |
| Surge Power (PRSM) | 85 W for t = 10 μs - supports single-event ESD or lightning-induced transient suppression |
| Junction Temperature (Tj) | 150°C maximum - constrains thermal design margin when mounted on compact boards |
| Package | 2-pin Super Mini Mold (SOD-323 equivalent footprint) - enables 1.7 mm × 1.25 mm board area usage |
Pinout & Package
RD120S-T1-AT uses a 2-pin Super Mini Mold package (equivalent to JEDEC SOD-323 outline), with cathode indicated by a band on the body. The package measures 2.5 mm × 1.7 mm × 1.25 mm (L × W × H) and is optimized for surface-mount reflow assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / reference ground node | Connected to circuit common or lower-potential rail; forms return path during forward bias or zener regulation |
| Cathode | Zener breakdown terminal / regulated output node | Connected to voltage source input; delivers stable 120 V reference when reverse biased above VZ |
Key Features
| Feature | Design Value |
|---|---|
| Sharp breakdown characteristic | Enables clean, repeatable turn-on at VZ with minimal knee region - critical for accurate clamping in protection circuits |
| VZ conforms to E24 standard | Guarantees compatibility with standard resistor/voltage-divider design practices and automated BOM tools |
| 200 mW power rating in ultra-small package | Supports integration into dense power management subsystems without thermal compromise on 30 mm × 30 mm PCBs |
| Negative temperature coefficient (~+0.095 %/°C) | Allows predictable drift modeling in ambient-temperature-varying applications such as outdoor sensor interfaces |
Applications
| Voltage Reference for SMPS Feedback | Overvoltage Clamp in Telecom Line Interface |
|---|---|
Use Scenario: Provides stable 120 V reference in secondary-side feedback loop of isolated flyback converters operating up to 150 VDC input. IC Role / Device Role / Timing Role: Zener diode functions as precision shunt reference, setting error amplifier threshold and regulating output voltage via optocoupler bias. Use Value: Maintains ±5% output regulation across line/load variations due to tight VZ tolerance and low dynamic impedance. |
Use Scenario: Protects line-driver ICs from induced surges on 48 V telecom distribution lines exposed to lightning coupling. IC Role / Device Role / Timing Role: Acts as passive crowbar element, clamping transients above 126 V before they reach sensitive interface logic. Use Value: Absorbs 85 W single-pulse energy without failure, preserving downstream IC integrity per GR-1089-CORE requirements. |
| Low-Power Sensor Bias Supply | Industrial PLC Input Protection |
Use Scenario: Generates a stable 120 V bias for high-impedance piezoelectric sensor signal conditioning in vibration monitoring modules. IC Role / Device Role / Timing Role: Supplies regulated excitation voltage while drawing <0.2 μA reverse leakage to avoid signal corruption. Use Value: Enables >100 dB common-mode rejection by eliminating supply-induced noise coupling into analog front-end. |
Use Scenario: Shields 24–120 VDC digital input channels in programmable logic controllers against field-wiring faults and inductive kickback. IC Role / Device Role / Timing Role: Functions as fail-safe shunt limiter, diverting fault current away from input buffer ICs during overvoltage events. Use Value: Prevents latch-up and permanent damage to input stage transistors under sustained 130 V transients per IEC 61000-4-5 Level 4. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor MMBZ5265B | 6.2 V zener, 200 mW, SOD-123 package - differs in voltage rating and package dimensions | Designed for low-voltage logic-level clamping, not high-voltage reference or surge absorption | Select only if system requires sub-10 V regulation; incompatible for 120 V use cases due to voltage mismatch |
| Vishay SZ1SMA120A | 120 V zener, 400 mW, SMA package - double the power rating and larger footprint (4.5 mm × 2.7 mm) | Targeted at higher-energy surge environments where 85 W pulse capability is insufficient | Choose when board layout allows larger package and thermal mass is needed for repetitive transient duty cycles |
Compared with RD120S-T1-AT, MMBZ5265B lacks voltage scalability for 120 V systems, while SZ1SMA120A trades miniaturization for higher surge endurance - making RD120S-T1-AT optimal for space-constrained, single-pulse 120 V reference and clamp designs.
Availability
RD120S-T1-AT is available at Aetrix Electronics and suitable for industrial power supply monitoring, telecom line protection, and PLC input conditioning requiring stable component supply, consistent parametric performance, and long-term obsolescence mitigation.
Supply support for RD120S-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 manufacturer headquartered in Japan, specializing in microcontrollers, analog and power devices, and advanced SoCs for industrial, automotive, and infrastructure markets.
RD120S-T1-AT belongs to the RD2.0S–RD150S zener diode family, engineered for precision voltage regulation and transient suppression in cost-sensitive, space-constrained industrial electronics where reliability and E24-standard compliance are essential.
FAQ
What is the zener voltage tolerance of RD120S-T1-AT?
The RD120S-T1-AT has a zener voltage range of 114.0 V to 126.0 V at IZ = 1 mA, representing ±5% tolerance around the nominal 120 V rating. This specification is verified per Renesas datasheet D11444EJ6V0DS and applies under pulsed 40 ms test conditions at 25°C ambient temperature. The RD120S-T1-AT maintains this tolerance across its qualified operating temperature range without recalibration.
Does RD120S-T1-AT support surface-mount reflow soldering?
Yes, RD120S-T1-AT is qualified for standard lead-free reflow soldering per J-STD-020. Its Super Mini Mold package withstands peak temperatures up to 260°C for 10 seconds. The RD120S-T1-AT's thermal profile compatibility is documented in Renesas packaging specifications, and no special prebake or moisture sensitivity handling is required for standard storage conditions.
What is the maximum allowable reverse voltage before breakdown for RD120S-T1-AT?
The RD120S-T1-AT exhibits ≤0.2 μA reverse current at VR = 91 V, meaning it remains effectively non-conductive below its specified zener voltage range. Breakdown begins at minimum VZ = 114.0 V, so operation below 91 V ensures negligible leakage; sustained bias above 126.0 V risks exceeding absolute maximum ratings and must be avoided unless transient-limited per Fig.12.
How does temperature affect the zener voltage of RD120S-T1-AT?
RD120S-T1-AT has a positive temperature coefficient of approximately +0.095 %/°C, as confirmed in Fig.10 of the Renesas datasheet. This means its zener voltage increases by ~0.114 V per 1°C rise at 120 V nominal. The RD120S-T1-AT's drift behavior is monotonic and predictable, enabling compensation in temperature-critical reference designs using simple linear correction.
Is RD120S-T1-AT suitable for automotive applications?
No, RD120S-T1-AT is classified as a Standard-grade Renesas product intended for computers, office equipment, and industrial robots per quality grade documentation. It is not qualified to AEC-Q101 or rated for automotive underhood environments. For automotive use, engineers must select components explicitly designated as High Quality or Automotive Grade - RD120S-T1-AT does not meet those criteria.
RD120S-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
RD120S-T1-AT FAQ
1.How can I place an order for RD120S-T1-AT through Aetrix?
Please submit a Request for Quotation (RFQ) for RD120S-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 RD120S-T1-AT reliable?
The price and inventory of RD120S-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 RD120S-T1-AT is usually 5 days.
3.What payment methods are accepted for RD120S-T1-AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD120S-T1-AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD120S-T1-AT?
RD120S-T1-AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD120S-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 RD120S-T1-AT?
For technical support, including RD120S-T1-AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD120S-T1-AT requirements.
6.How does Aetrix verify that RD120S-T1-AT is sourced from the original manufacturer or authorized distributors?
All RD120S-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 RD120S-T1-AT meets industry standards.
7.What is the process for return or replacement of RD120S-T1-AT?
All RD120S-T1-AT units undergo pre-shipment inspection (PSI). If there is an issue with RD120S-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 RD120S-T1-AT part is unused and in its original packaging.
Return procedure for RD120S-T1-AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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