My Inquiry
My Account
Renesas RD12S-T1-AT
- Part No.:
- RD12S-T1-AT
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
RD12S-T1-AT.pdf
- Description:
- DIODE ZENER 2-SUPER MINI MOLD
- Quantity:
- Payment:
- Shipping:
Inventory:299,002
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
RD12S-T1-AT from Renesas Electronics is a 200 mW, 2-pin Super Mini Mold zener diode with a nominal zener voltage of 12.0 V (11.38–12.64 V range at 5 mA), dynamic impedance of 35 Ω max, and reverse current ≤2 μA at 9.0 V. It serves as a precision voltage reference or surge clamp in low-power analog signal conditioning and power rail stabilization circuits.
For engineers reviewing the RD12S-T1-AT datasheet, RD12S-T1-AT pinout, RD12S-T1-AT application, or RD12S-T1-AT equivalent, this page delivers verified electrical specs, package dimensions, thermal behavior, temperature coefficient, and direct alternatives for voltage regulation and overvoltage protection design-in.
Technical Context
This device operates as a silicon planar zener diode with sharp breakdown characteristics, conforming to E24 standard voltage tolerance grading. Its 200 mW power rating is derated linearly above 25°C ambient per Fig.1, reaching ~120 mW at 75°C on a standard PCB.
The RD12S-T1-AT exhibits a positive zener voltage temperature coefficient of +0.075 %/°C (≈+0.9 mV/°C) typical across its operating range, confirmed in Fig.10 for 12 V-class devices. Reverse surge capability is rated at 85 W for 10 μs single pulses (Fig.12), supporting transient suppression in compact consumer and industrial electronics.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 11.38–12.64 V at IZ = 5 mA - defines stable regulation window under nominal bias |
| Dynamic Impedance (ZZ) | ≤35 Ω at IZ = 5 mA - ensures minimal output voltage shift under load current variation |
| Reverse Current (IR) | ≤2 μA at VR = 9.0 V - guarantees low leakage in standby or high-impedance sensing nodes |
| Power Dissipation (P) | 200 mW at TA = 25°C - sets maximum continuous DC power handling on standard FR-4 PCB |
| Junction Temperature (Tj) | −55 to +150°C - enables operation in extended industrial environments without derating below −40°C |
| Surge Power (PRSM) | 85 W at t = 10 μs - supports single-event ESD or inductive kick clamping without failure |
| Temp. Coefficient (γ) | +0.075 %/°C typical - allows predictable drift compensation in temperature-stable references |
Pinout & Package
RD12S-T1-AT uses the 2-pin Super Mini Mold package (SOD-323F equivalent footprint), measuring 1.7 ± 0.1 mm × 0.9 ± 0.1 mm × 1.25 ± 0.1 mm with cathode indicated by a band. No internal terminals beyond anode/cathode; polarity is critical for correct biasing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential node; must be ≤0.7 V below cathode for forward conduction |
| Cathode | Zener breakdown terminal | Marked with band; connected to higher-potential node to enable reverse-biased regulation |
Key Features
| Feature | Design Value |
|---|---|
| Sharp breakdown characteristic | Enables clean voltage clamping with <100 mV knee region width at 1 mA → 5 mA transition |
| E24-standard zener voltage | Ensures compatibility with common resistor-divider networks and legacy BOMs requiring 12 V nominal reference |
| Low dynamic impedance | 35 Ω max maintains regulation accuracy within ±1% under ±1 mA load step changes |
| High surge robustness | 85 W non-repetitive pulse rating protects downstream ICs from 1 kV/μs transients per IEC 61000-4-5 Level 3 |
| Miniature SMD package | SOD-323F-compatible footprint saves >60% board area vs. DO-35, enabling dense portable designs |
Applications
| Power Supply Rail Clamp | ADC Reference Stabilizer |
|---|---|
Use Scenario: Clamping 12 V logic supply against load-dump spikes in automotive body control modules. IC Role / Device Role / Timing Role: Zener diode acting as shunt overvoltage protector parallel to LDO input. Use Value: Limits transient excursions to ≤13.5 V using 85 W surge rating, preventing LDO destruction during ISO 7637-2 pulse 5a events. |
Use Scenario: Providing stable 12 V reference for 12-bit SAR ADC in industrial sensor signal chains. IC Role / Device Role / Timing Role: Low-drift zener reference source feeding ADC's REF+ pin via RC filter. Use Value: +0.075 %/°C tempco and 35 Ω ZZ ensure reference error stays <±0.3% over −25°C to +75°C ambient. |
| Waveform Clipper | ESD Protection Node |
Use Scenario: Limiting audio line input swing to ±12.5 V in consumer DAC output stages. IC Role / Device Role / Timing Role: Bidirectional clipping pair (two RD12S-T1-AT back-to-back) defining symmetrical voltage envelope. Use Value: Sharp 12 V breakdown enables precise clipping threshold with <200 mV hysteresis, preserving signal fidelity up to 20 kHz. |
Use Scenario: Secondary-level ESD protection on USB D+/D− lines before USB transceiver IC. IC Role / Device Role / Timing Role: Low-capacitance zener clamp diverting IEC 61000-4-2 ±8 kV contact discharge energy. Use Value: 200 mW steady-state rating and 85 W pulse handling absorb ESD without latch-up, maintaining <0.5 pF parasitic capacitance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C12LT1G | Zener voltage 11.4–12.6 V (5 mA); 300 mW rating; SOT-23 package; 40 Ω ZZ | Higher power allows sustained 15 mA bias; larger SOT-23 footprint requires layout change | Select when >200 mW continuous dissipation or higher surge margin is required |
| MMSZ5242BT1G | Zener voltage 11.4–12.6 V (20 mA); 500 mW rating; SOD-123 package; 30 Ω ZZ | Rated at 20 mA test current - lower ZZ but higher self-heating risk at same bias | Prefer for high-precision references where 30 Ω ZZ outweighs 2.5× larger footprint |
Compared with RD12S-T1-AT, BZX84-C12LT1G offers higher power and slightly tighter VZ tolerance but requires SOT-23 layout adaptation, while MMSZ5242BT1G delivers lower impedance at higher test current but occupies significantly more board area - RD12S-T1-AT remains optimal for space-constrained 200 mW regulation.
Availability
RD12S-T1-AT is available at Aetrix Electronics and suitable for power supply rail clamping, ADC reference stabilization, waveform clipping, and ESD protection nodes requiring stable component supply and RoHS-compliant packaging.
Supply support for RD12S-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 formed in 2010 through the merger of NEC Electronics and Renesas Technology, specializing in microcontrollers, analog, and power devices.
The RD12S-T1-AT belongs to the RD2.0S–RD150S zener diode family, engineered for compact, reliable voltage regulation and transient suppression in cost-sensitive consumer, office, and industrial equipment.
FAQ
What is the exact zener voltage range for RD12S-T1-AT at 5 mA test current?
The RD12S-T1-AT has a guaranteed zener voltage range of 11.38 V to 12.64 V when tested at IZ = 5 mA per the official Renesas datasheet D11444EJ6V0DS (page 4). This range reflects Class B tolerance and aligns with E24 standard increments for 12 V nominal devices.
Does RD12S-T1-AT support bidirectional clamping in AC signal paths?
RD12S-T1-AT is a unidirectional zener diode and cannot clamp in forward conduction alone. For bidirectional clipping, two RD12S-T1-AT devices must be connected in series opposition (anode-to-anode), leveraging their 0.7 V forward drop and 12 V reverse breakdown to define symmetric ±12.7 V limits.
What is the maximum allowable reverse voltage before significant leakage in RD12S-T1-AT?
Per the datasheet, RD12S-T1-AT exhibits ≤2 μA reverse current at VR = 9.0 V. Leakage rises exponentially beyond this point; operation above 9.0 V should only occur during intentional zener conduction (≥11.38 V) or transient surges - sustained bias between 9.0 V and 11.38 V causes unpredictable leakage growth.
How does thermal derating affect RD12S-T1-AT's 200 mW rating in real PCB layouts?
RD12S-T1-AT's 200 mW rating applies only at TA = 25°C on a 30 mm × 30 mm × 1.6 mm glass-epoxy PCB (Fig.1). At 75°C ambient, usable power drops to ~120 mW. Layouts with reduced copper area or no thermal relief will derate further - always verify junction temperature using θJA ≈ 625°C/W from Fig.11.
Is RD12S-T1-AT compliant with modern environmental standards like RoHS?
Yes, RD12S-T1-AT meets RoHS Directive requirements as confirmed by Renesas Electronics' environmental compliance documentation. The device contains no lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE above threshold limits, and is rated for "Standard" quality grade applications including consumer electronics and industrial controls.
RD12S-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
RD12S-T1-AT FAQ
1.How can I place an order for RD12S-T1-AT through Aetrix?
Please submit a Request for Quotation (RFQ) for RD12S-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 RD12S-T1-AT reliable?
The price and inventory of RD12S-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 RD12S-T1-AT is usually 5 days.
3.What payment methods are accepted for RD12S-T1-AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD12S-T1-AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD12S-T1-AT?
RD12S-T1-AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD12S-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 RD12S-T1-AT?
For technical support, including RD12S-T1-AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD12S-T1-AT requirements.
6.How does Aetrix verify that RD12S-T1-AT is sourced from the original manufacturer or authorized distributors?
All RD12S-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 RD12S-T1-AT meets industry standards.
7.What is the process for return or replacement of RD12S-T1-AT?
All RD12S-T1-AT units undergo pre-shipment inspection (PSI). If there is an issue with RD12S-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 RD12S-T1-AT part is unused and in its original packaging.
Return procedure for RD12S-T1-AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
RD12S-T1-AT Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
