My Inquiry
My Account
Renesas RD43S-T1-AT
- Part No.:
- RD43S-T1-AT
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
RD43S-T1-AT.pdf
- Description:
- DIODE ZENER 2-SUPER MINI MOLD
- Quantity:
- Payment:
- Shipping:
Inventory:9,000
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
RD43S-T1-AT from Renesas Electronics is a 200 mW, 40–45 V Zener diode in Super Mini Mold (SOD-323) package, optimized for 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. Used in precision reference and transient protection for sensor signal conditioning and power rail clamping.
For engineers reviewing the RD43S-T1-AT datasheet, RD43S-T1-AT pinout, RD43S-T1-AT application, or RD43S-T1-AT equivalent, key selection criteria include zener voltage accuracy (40.0–45.0 V), low reverse leakage (<2 μA at 33 V), thermal stability (temperature coefficient ~0.095 %/°C), and SOD-323 footprint compatibility with space-constrained PCB layouts.
Technical Context
This device belongs to the RD2.0S–RD150S series of silicon planar Zener diodes, fabricated using diffusion process technology to ensure sharp breakdown characteristics and stable voltage regulation under DC and pulsed conditions. It is rated for 200 mW steady-state power dissipation on FR-4 PCB (30 mm × 30 mm × 1.6 mm) and supports non-repetitive 85 W surge power at 10 μs pulse width.
The RD43S-T1-AT exhibits a positive temperature coefficient (~0.095 %/°C or ~38 mV/°C) typical for zeners above 6 V, enabling predictable drift behavior in temperature-varying environments. Its cathode-indicated SOD-323 package ensures unambiguous polarity during automated placement and manual inspection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 40.0–45.0 V at IZ = 2 mA - defines precise clamping threshold for overvoltage protection and reference generation. |
| Dynamic Impedance (ZZ) | 130 Ω max at IZ = 2 mA - determines regulation stiffness; lower values improve load regulation in feedback loops. |
| Reverse Current (IR) | <2 μA at VR = 33 V - ensures minimal standby power loss and high off-state impedance in bias networks. |
| Power Dissipation (P) | 200 mW at TA = 25°C - sets maximum continuous DC power handling on standard PCB layout. |
| Surge Power (PRSM) | 85 W at t = 10 μs (1 pulse) - enables robust transient suppression against ESD and inductive kickback events. |
| Junction Temperature (Tj) | 150°C max - defines upper thermal limit for reliable operation without parametric shift or degradation. |
| Package | SOD-323 (2-pin Super Mini Mold) - 1.25 mm × 0.9 mm footprint with 0.3 mm pitch; compatible with 0201-class pick-and-place. |
Pinout & Package
RD43S-T1-AT uses a 2-pin SOD-323 surface-mount package with cathode indicated by a band. The device has no active logic or control pins-only anode and cathode terminals defining unidirectional conduction and zener breakdown direction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener reference ground node | Connected to circuit ground or lower-potential rail; forms return path during forward bias or zener regulation. |
| Cathode | Zener breakdown terminal / Voltage clamp output | Connected to protected node or reference point; maintains regulated voltage relative to anode during reverse breakdown. |
Key Features
| Feature | Design Value |
|---|---|
| Sharp breakdown characteristic | Enables clean, repeatable voltage clamping with minimal knee region ambiguity in low-current applications. |
| VZ conforms to E24 standard | Ensures interoperability with industry-standard resistor and capacitor value series for predictable analog design. |
| 150°C maximum junction temperature | Supports operation in thermally demanding environments such as industrial enclosures or near power converters. |
| Cathode band marking | Provides unambiguous polarity identification for automated optical inspection (AOI) and manual assembly verification. |
| RoHS-compliant construction | Meets EU Directive 2011/65/EU requirements for lead-free soldering and hazardous substance restriction. |
Applications
| Industrial Sensor Reference | USB Port Overvoltage Clamp |
|---|---|
Use Scenario: Stabilizing excitation voltage for bridge-based pressure sensors in factory automation systems. IC Role / Device Role / Timing Role: Zener reference diode providing fixed 43 V bias to Wheatstone bridge, compensating for supply ripple. Use Value: Maintains <±0.5% output linearity across –25°C to +85°C ambient due to predictable temperature coefficient and low dynamic impedance. |
Use Scenario: Protecting USB 2.0 data lines and VBUS against ESD and accidental 48 V PoE misconnection. IC Role / Device Role / Timing Role: Standoff clamping diode placed between VBUS and ground to shunt transients before they reach USB controller IC. Use Value: Absorbs 85 W surge energy at 10 μs without failure, limiting peak clamped voltage to ≤47 V per IEC 61000-4-2 Level 4. |
| Low-Power ADC Reference | LED Driver Current Sense Clamp |
Use Scenario: Generating stable reference for 12-bit SAR ADC in battery-powered environmental monitors. IC Role / Device Role / Timing Role: Precision voltage reference source feeding ADC's REF+ input, replacing higher-cost bandgap ICs. Use Value: Delivers 43 V ±2.5% tolerance with <2 μA leakage, minimizing reference current error and extending battery life. |
Use Scenario: Limiting sense voltage across current-sense resistor in constant-current LED driver for signage applications. IC Role / Device Role / Timing Role: Zener clamp preventing op-amp saturation when LED string opens or dimming PWM duty exceeds safe limits. Use Value: Activates at 43 V to cap sense node voltage, preserving amplifier common-mode range and avoiding latch-up. |
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 package; 100 Ω ZZ at 5 mA. | Larger footprint and higher power - suitable where board space allows and thermal margin is critical. | Select BZX55-C43 only if SOD-323 size constraint is relaxed and higher surge capability is required. |
| MMSZ43ET1G (ON Semiconductor) | SOD-123 package (1.8 × 1.4 mm), same 43 V VZ, 130 Ω ZZ at 2 mA, RoHS-compliant. | 0.5 mm larger length/width than RD43S-T1-AT - may require minor layout revision but offers broader distributor availability. | Choose MMSZ43ET1G when supply chain diversification or second-source validation is prioritized over minimal footprint. |
Compared with RD43S-T1-AT, BZX55-C43 offers higher power headroom but requires through-hole or larger SMD layout, while MMSZ43ET1G matches electrical specs closely but occupies 40% more board area - making RD43S-T1-AT optimal for ultra-compact, cost-sensitive consumer electronics where 200 mW suffices.
Availability
RD43S-T1-AT is available at Aetrix Electronics and suitable for industrial sensor reference, USB port overvoltage clamp, and low-power ADC reference applications requiring stable component supply, consistent parametric performance, and long-term production continuity.
Supply support for RD43S-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 headquartered in Japan, specializing in microcontrollers, analog power devices, and timing solutions for industrial, automotive, and consumer markets.
The RD2.0S–RD150S series was designed for cost-effective, space-efficient voltage regulation and transient suppression in standard-grade electronics - targeting computers, office equipment, test instruments, and home appliances.
FAQ
What is the exact zener voltage range for RD43S-T1-AT at 2 mA test current?
The RD43S-T1-AT has a guaranteed zener voltage range of 40.0 V to 45.0 V when measured at IZ = 2 mA under pulsed 40 ms conditions, per Renesas datasheet D11444EJ6V0DS. This 5 V window reflects ±5.6% tolerance around the nominal 43 V rating and is validated for each production lot.
Does RD43S-T1-AT support reflow soldering, and what is its MSL rating?
Yes, RD43S-T1-AT is qualified for Pb-free reflow soldering per J-STD-020. It carries Moisture Sensitivity Level (MSL) 1 - unlimited floor life at ≤30°C/85% RH - due to its fully molded SOD-323 epoxy package, eliminating bake requirements prior to assembly.
Can RD43S-T1-AT be used in place of a 43 V Zener in a linear regulator feedback network?
Yes, RD43S-T1-AT is suitable for feedback node clamping in linear regulators where 43 V reference stability and low dynamic impedance (≤130 Ω) are required. Its 2 μA reverse leakage at 33 V minimizes current error in high-impedance divider networks, preserving regulation accuracy.
What is the thermal resistance (RθJA) of RD43S-T1-AT on a standard PCB?
Based on the transient thermal impedance curve (Fig.11) and steady-state derating plot (Fig.1), RD43S-T1-AT exhibits RθJA ≈ 625°C/W on a 30 mm × 30 mm × 1.6 mm FR-4 PCB. This results in a 125°C junction rise at full 200 mW dissipation - confirming safe operation up to +25°C ambient.
Is RD43S-T1-AT compliant with AEC-Q200 for automotive use?
No, RD43S-T1-AT is classified as "Standard" grade per Renesas quality grading (Section 7 of datasheet), intended for computers, office equipment, and industrial robots - not automotive or safety-critical systems. For AEC-Q200 applications, consult Renesas' automotive-qualified Zener portfolio separately.
RD43S-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
RD43S-T1-AT FAQ
1.How can I place an order for RD43S-T1-AT through Aetrix?
Please submit a Request for Quotation (RFQ) for RD43S-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 RD43S-T1-AT reliable?
The price and inventory of RD43S-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 RD43S-T1-AT is usually 5 days.
3.What payment methods are accepted for RD43S-T1-AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD43S-T1-AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD43S-T1-AT?
RD43S-T1-AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD43S-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 RD43S-T1-AT?
For technical support, including RD43S-T1-AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD43S-T1-AT requirements.
6.How does Aetrix verify that RD43S-T1-AT is sourced from the original manufacturer or authorized distributors?
All RD43S-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 RD43S-T1-AT meets industry standards.
7.What is the process for return or replacement of RD43S-T1-AT?
All RD43S-T1-AT units undergo pre-shipment inspection (PSI). If there is an issue with RD43S-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 RD43S-T1-AT part is unused and in its original packaging.
Return procedure for RD43S-T1-AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
RD43S-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…
