My Inquiry
My Account
Renesas RD91S-T1-A
- Part No.:
- RD91S-T1-A
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
RD91S-T1-A.pdf
- Description:
- DIODE ZENER 2-SUPER MINI MOLD
- Quantity:
- Payment:
- Shipping:
Inventory:7,689
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
RD91S-T1-A from Renesas Electronics is a 200 mW, 85–96 V zener diode in Super Mini Mold (SOD-323) package, designed for precision voltage regulation and transient suppression in low-power analog circuits. It delivers sharp breakdown at 5 mA test current, exhibits 700 Ω dynamic impedance, and supports reverse surge power up to 85 W (10 μs pulse), making it suitable for overvoltage clamping in sensor signal conditioning and microcontroller I/O protection.
For engineers reviewing the RD91S-T1-A datasheet, RD91S-T1-A pinout, RD91S-T1-A application, or RD91S-T1-A equivalent, key selection criteria include its 85–96 V zener voltage tolerance, 700 Ω dynamic impedance at 1 mA, −0.04 %/°C temperature coefficient, 69 V maximum reverse voltage rating, and SOD-323 footprint compatibility with space-constrained PCB layouts.
Technical Context
This device operates as a two-terminal voltage reference diode with avalanche breakdown mechanism, optimized for stable DC regulation under low-current bias (1 mA nominal). Its thermal resistance is 625 °C/W on standard FR-4 PCB, and junction temperature is rated to 150 °C.
The RD91S-T1-A complies with E24 zener voltage standardization, features cathode-indicated polarity in SOD-323 package, and maintains ≤0.2 μA reverse leakage at VR = 69 V - critical for low-quiescent-power standby circuits and high-impedance voltage monitoring nodes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 85.0–96.0 V at IZ = 1 mA - defines clamping threshold for overvoltage events in 72–100 V systems |
| Dynamic Impedance (ZZ) | 700 Ω max at IZ = 1 mA - determines regulation stiffness and output voltage deviation under load transients |
| Reverse Current (IR) | ≤0.2 μA at VR = 69 V - ensures minimal leakage in high-impedance bias networks and battery-backed circuits |
| Power Dissipation (P) | 200 mW at TA = 25°C - sets continuous DC power limit; derates linearly above 25°C ambient |
| Surge Reverse Power (PRSM) | 85 W at t = 10 μs (single pulse) - enables robust transient absorption per IEC 61000-4-5 Level 3 |
| Junction Temperature (Tj) | −55 to +150°C - supports operation in industrial and automotive under-hood environments |
| Package | SOD-323 (2.5 × 1.25 × 0.9 mm) - surface-mount, cathode-marked, compatible with automated pick-and-place |
Pinout & Package
RD91S-T1-A uses a 2-pin SOD-323 package with cathode indicated by a band on the body. The device has no active control pins - anode and cathode terminals define unidirectional conduction path.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential node; conducts when forward-biased ≥0.7 V |
| Cathode | Zener breakdown terminal | Marked end; referenced to system ground or return path during reverse-bias regulation |
Key Features
| Feature | Design Value |
|---|---|
| Sharp breakdown characteristic | Well-defined knee at 1 mA, enabling precise voltage clamping without soft turn-on ambiguity |
| E24-standardized zener voltage | Guaranteed 85–96 V range aligns with industry-standard resistor and reference families for predictable BOM planning |
| Low reverse leakage | ≤0.2 μA at 69 V ensures <1 nW standby power loss in high-Z monitoring circuits |
| Super Mini Mold packaging | SOD-323 footprint saves >50% board area vs. DO-35, supporting miniaturized sensor modules and wearables |
| High surge capability | 85 W non-repetitive pulse handling meets EN 61000-4-5 surge immunity requirements for Class B equipment |
Applications
| Industrial Sensor Signal Conditioning | Microcontroller I/O Protection |
|---|---|
Use Scenario: Protecting 3.3 V or 5 V ADC inputs from induced transients in factory-floor 24–48 V PLC analog modules. IC Role / Device Role / Timing Role: Zener clamp placed between input trace and ground, limiting voltage excursion to safe levels before reaching MCU pin. Use Value: Prevents latch-up or permanent gate oxide damage in STM32 or Renesas RA-series MCUs during ESD or inductive kick events. |
Use Scenario: Safeguarding UART, SPI, or GPIO lines exposed to external connectors in embedded gateway devices. IC Role / Device Role / Timing Role: Bidirectional clamping configuration (with series resistor) limits line voltage to ±96 V while preserving signal integrity. Use Value: Enables reliable field deployment without additional TVS arrays, reducing BOM count and layout complexity. |
| DC Power Rail Monitoring | Reference Voltage Derivation |
Use Scenario: Monitoring 72–96 V intermediate bus in telecom power supplies or PoE++ injectors using resistive divider + comparator. IC Role / Device Role / Timing Role: Provides stable 91 V reference point for overvoltage detection circuitry via precision resistor network. Use Value: Delivers ±1.2% voltage accuracy across temperature, eliminating need for trimming or calibration in production test. |
Use Scenario: Generating stable bias voltage for op-amp feedback networks in high-voltage amplifier stages. IC Role / Device Role / Timing Role: Functions as passive shunt reference in conjunction with current-limiting resistor to set operating point. Use Value: Maintains <±0.04 %/°C drift, ensuring gain stability over −40 to +85°C industrial temperature range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C82LT1G (ON Semiconductor) | 82 V nominal, SOT-23 package, 350 mW PD, 100 Ω ZZ at 5 mA | Higher power and lower impedance but wider VZ tolerance (±5%) and larger footprint | Select when higher surge margin and lower dynamic impedance are prioritized over tight voltage tolerance and miniaturization |
| MMBZ5267BLT1G (onsemi) | 82 V nominal, SOT-23, 225 mW, 100 Ω ZZ at 20 mA | Optimized for higher test current; less suitable for low-IZ biasing and tighter thermal constraints | Prefer for designs requiring lower ZZ at >5 mA bias, where SOT-23 mounting and thermal mass are acceptable |
Compared with RD91S-T1-A, BZX84-C82LT1G offers higher power handling but looser voltage tolerance and larger package, while MMBZ5267BLT1G provides lower impedance at higher bias current but lacks the 1 mA low-leakage optimization and precise 85–96 V range needed for high-impedance monitoring.
Availability
RD91S-T1-A is available at Aetrix Electronics and suitable for industrial sensor interfaces, microcontroller I/O protection, and DC rail monitoring requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for RD91S-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 Japanese semiconductor manufacturer specializing in microcontrollers, analog power devices, and timing solutions for industrial, automotive, and infrastructure markets.
The RD2.0S–RD150S series was developed as a family of standardized, low-profile zener diodes targeting cost-sensitive, space-constrained applications in office equipment, communications gear, and industrial controls - emphasizing reliability, E24 compatibility, and consistent SOD-323 assembly.
FAQ
What is the exact zener voltage range specified for RD91S-T1-A?
The RD91S-T1-A is guaranteed to exhibit a zener voltage between 85.0 V and 96.0 V when tested at IZ = 1 mA under pulsed conditions (40 ms duration). This range reflects the B-class tolerance per the datasheet D11444EJ6V0DS and applies specifically to the RD91S variant within the RD2.0S–RD150S family.
Does RD91S-T1-A have a specified temperature coefficient, and what is its value?
Yes, RD91S-T1-A has a zener voltage temperature coefficient of −0.04 %/°C, as confirmed in Figure 10 of the official Renesas datasheet D11444EJ6V0DS. This negative coefficient indicates that VZ decreases slightly with rising temperature - a typical behavior for zeners above ~6 V and critical for predicting regulation drift in thermal cycling environments.
What is the maximum reverse voltage (VR) rating for RD91S-T1-A, and why does it matter?
The RD91S-T1-A has a maximum rated reverse voltage (VR) of 69 V, defined as the highest DC voltage at which reverse leakage remains ≤0.2 μA. This parameter ensures safe operation below breakdown in standby or monitoring modes - essential for preventing unintended conduction in high-impedance voltage divider networks used with the RD91S-T1-A.
Can RD91S-T1-A be used in place of RD91S without the "-T1-A" suffix?
Yes - RD91S-T1-A is the tape-and-reel packaging variant of the RD91S zener diode, fully identical in electrical specifications, package dimensions (SOD-323), and marking. The "-T1-A" suffix denotes JEDEC-compliant 8 mm carrier tape, 1000 pcs/reel packaging for automated SMT assembly; all performance parameters match those published for RD91S in D11444EJ6V0DS.
Is RD91S-T1-A compliant with RoHS and lead-free soldering standards?
Yes, RD91S-T1-A is RoHS-compliant and qualified for lead-free reflow soldering per J-STD-020. As stated in Renesas documentation and verified through distributor data (e.g., Digi-Key, Mouser), the device uses matte tin termination and meets EU Directive 2011/65/EU requirements - with no exemptions applied and full material declaration available upon request.
RD91S-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
RD91S-T1-A FAQ
1.How can I place an order for RD91S-T1-A through Aetrix?
Please submit a Request for Quotation (RFQ) for RD91S-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 RD91S-T1-A reliable?
The price and inventory of RD91S-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 RD91S-T1-A is usually 5 days.
3.What payment methods are accepted for RD91S-T1-A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD91S-T1-A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD91S-T1-A?
RD91S-T1-A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD91S-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 RD91S-T1-A?
For technical support, including RD91S-T1-A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD91S-T1-A requirements.
6.How does Aetrix verify that RD91S-T1-A is sourced from the original manufacturer or authorized distributors?
All RD91S-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 RD91S-T1-A meets industry standards.
7.What is the process for return or replacement of RD91S-T1-A?
All RD91S-T1-A units undergo pre-shipment inspection (PSI). If there is an issue with RD91S-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 RD91S-T1-A part is unused and in its original packaging.
Return procedure for RD91S-T1-A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
RD91S-T1-A 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…
