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Home > Products > Discrete Semiconductor Products > Diodes > Zener > Single Zener Diodes

Renesas RD91S(0)-T1-AT

Name: RD91S(0)-T1-AT
Brand: Renesas
SKU: RD91S(0)-T1-AT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: RD91S(0)-T1-AT

Manufacturer:: Renesas

Category:: Single Zener Diodes

Package:: SC-76, SOD-323

Datasheet:: RD91S(0)-T1-AT.pdf

Description:: DIODE ZENER 2-SUPER MINI MOLD

Quantity:: RFQ Add To RFQ list

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Inventory:18,000

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Product details

Overview

RD91S(0)-T1-AT from Renesas Electronics is a 200 mW, 2-pin Super Mini Mold zener diode with a nominal zener voltage of 91 V (85–96 V range at 1 mA), dynamic impedance of 700 Ω, and reverse current ≤0.2 μA at 69 V - designed for precision voltage regulation and surge suppression in low-power analog signal conditioning circuits.

For engineers reviewing the RD91S(0)-T1-AT datasheet, RD91S(0)-T1-AT pinout, RD91S(0)-T1-AT application, or RD91S(0)-T1-AT equivalent, this device serves as a stable reference in power supply feedback loops, overvoltage clamp stages, and waveform shaping networks where tight voltage tolerance and low leakage are critical.

Technical Context

This zener diode operates in reverse breakdown mode with sharp knee characteristics, optimized for constant-voltage regulation at I_Z = 1 mA. Its E24-standardized zener voltage ensures compatibility with common design margins and calibration requirements.

The device features a low temperature coefficient (≈+0.09 %/°C per Fig.10) and is rated for junction temperatures up to 150°C, enabling reliable operation in ambient environments up to 125°C on standard PCB layouts.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	85.0–96.0 V at I_Z = 1 mA - defines clamping threshold in overvoltage protection and reference accuracy in feedback networks.
Dynamic Impedance (Z_Z)	700 Ω max at I_Z = 1 mA - determines regulation stiffness and output voltage deviation under load transients.
Reverse Current (I_R)	≤0.2 μA at V_R = 69 V - ensures minimal standby leakage in high-impedance bias or sensing circuits.
Power Dissipation (P)	200 mW at T_A = 25°C - sets maximum continuous DC power handling without derating.
Surge Power (P_RSM)	85 W at t = 10 μs (single pulse) - supports transient suppression of short-duration ESD or inductive spikes.
Junction Temperature (T_j)	150°C max - defines thermal limit for reliability under sustained reverse bias conditions.

Pinout & Package

RD91S(0)-T1-AT uses the 2-pin Super Mini Mold package (SOD-323 equivalent footprint), with cathode indicated by a band on the body. The device has no active terminals beyond anode and cathode - polarity must be observed for correct reverse-bias operation.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward conduction terminal	Connected to lower-potential node; forms forward path during non-regulation states.
Cathode	Zener breakdown terminal	Marked with band; connected to higher-potential node to enable reverse-bias regulation.

Key Features

Feature	Design Value
Sharp breakdown characteristic	Enables clean voltage clamping with minimal knee spread - critical for accurate overvoltage detection.
E24-standardized V_Z	Ensures predictable selection across common design libraries and avoids custom voltage binning.
200 mW power rating	Supports compact placement in space-constrained consumer and industrial PCBs without heatsinking.
Low IR at VR = 69 V	Reduces error in high-resistance divider networks and preserves battery life in always-on monitoring circuits.

Applications

Voltage Reference Circuit	Overvoltage Clamp Stage
Use Scenario: Precision feedback loop in isolated DC-DC converter secondary-side regulation. IC Role / Device Role / Timing Role: Zener reference providing stable 91 V threshold for optocoupler biasing and error amplifier input. Use Value: Maintains ±1.2% output voltage stability over temperature due to predictable V_Z drift and low Z_Z.	Use Scenario: Input-stage protection for microcontroller GPIO exposed to 72 V industrial bus transients. IC Role / Device Role / Timing Role: Fast-acting shunt clamp limiting voltage to safe levels before internal ESD structures activate. Use Value: Absorbs 85 W surges (10 μs) without degradation, preventing latch-up or permanent gate oxide damage.
Waveform Clipper Network	Constant-Current Bias Source
Use Scenario: Audio signal limiting in analog front-end of test equipment input stage. IC Role / Device Role / Timing Role: Bidirectional clipping element defining symmetrical ±91 V peak amplitude envelope. Use Value: Delivers <10 ns response to fast-rising edges due to low junction capacitance and sharp knee behavior.	Use Scenario: Stable current source for LED driver biasing in optical sensor modules. IC Role / Device Role / Timing Role: Series-connected zener establishing fixed 1 mA reference current via external resistor. Use Value: Achieves <±2% current variation across –40°C to +85°C using inherent temperature coefficient compensation.

Voltage Reference Circuit

Overvoltage Clamp Stage

Use Scenario: Precision feedback loop in isolated DC-DC converter secondary-side regulation.

IC Role / Device Role / Timing Role: Zener reference providing stable 91 V threshold for optocoupler biasing and error amplifier input.

Use Value: Maintains ±1.2% output voltage stability over temperature due to predictable V_Z drift and low Z_Z.

Use Scenario: Input-stage protection for microcontroller GPIO exposed to 72 V industrial bus transients.

IC Role / Device Role / Timing Role: Fast-acting shunt clamp limiting voltage to safe levels before internal ESD structures activate.

Use Value: Absorbs 85 W surges (10 μs) without degradation, preventing latch-up or permanent gate oxide damage.

Waveform Clipper Network

Constant-Current Bias Source

Use Scenario: Audio signal limiting in analog front-end of test equipment input stage.

IC Role / Device Role / Timing Role: Bidirectional clipping element defining symmetrical ±91 V peak amplitude envelope.

Use Value: Delivers <10 ns response to fast-rising edges due to low junction capacitance and sharp knee behavior.

Use Scenario: Stable current source for LED driver biasing in optical sensor modules.

IC Role / Device Role / Timing Role: Series-connected zener establishing fixed 1 mA reference current via external resistor.

Use Value: Achieves <±2% current variation across –40°C to +85°C using inherent temperature coefficient compensation.

Equivalent & Alternatives

The following parts are listed as comparable options for similar zener diode applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX84-C91LT1G	100 mW rating, SOT-23 package, V_Z = 91 V (86.5–95.5 V), Z_Z = 1000 Ω @ 5 mA	Lower power handling and higher dynamic impedance reduce regulation accuracy in precision feedback paths.	Preferred for cost-sensitive, low-current biasing where 200 mW headroom is unnecessary.
1N4745A	1 W rating, DO-41 package, V_Z = 91 V (86.5–95.5 V), Z_Z = 150 Ω @ 23 mA	Larger footprint and higher test current shift optimal operating point away from low-power designs.	Selected when surge energy exceeds 85 W or continuous dissipation >200 mW is required.

Compared with BZX84-C91LT1G and 1N4745A, RD91S(0)-T1-AT uniquely balances 200 mW capability, SOD-323-compatible size, and 1 mA test condition - making it optimal for space-constrained, low-quiescent-current voltage reference and clamp functions where thermal mass and layout density matter.

Availability

RD91S(0)-T1-AT is available at Aetrix Electronics and suitable for voltage reference circuits, overvoltage clamp stages, and waveform clipper networks requiring stable component supply and consistent parametric performance across production lots.

Supply support for RD91S(0)-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 formed in 2010 through the merger of NEC Electronics and Renesas Technology, specializing in microcontrollers, analog, and power devices.

The RD2.0S to RD150S series was developed for general-purpose voltage regulation and transient suppression in Standard-grade applications including office equipment, communications gear, and industrial controls.

FAQ

What is the zener voltage tolerance of RD91S(0)-T1-AT?

The RD91S(0)-T1-AT has a zener voltage range of 85.0 V to 96.0 V at I_Z = 1 mA, corresponding to a ±6% tolerance about the nominal 91 V value. This specification is confirmed in the Electrical Characteristics table on page 5 of Renesas datasheet D11444EJ6V0DS.

Is RD91S(0)-T1-AT RoHS compliant?

Yes, RD91S(0)-T1-AT meets EU RoHS Directive requirements. Renesas confirms environmental compliance for the RD2.0S to RD150S series in its product environmental documentation, and the device contains no lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE above threshold limits.

What is the maximum allowable reverse surge power for RD91S(0)-T1-AT?

The RD91S(0)-T1-AT supports a non-repetitive reverse surge power of 85 W at pulse width t = 10 μs, as specified in the Absolute Maximum Ratings table (Fig.12). This rating applies to single-event transients and must not be exceeded even once without verification of thermal recovery.

Does RD91S(0)-T1-AT have a specified temperature coefficient?

Yes, RD91S(0)-T1-AT exhibits a positive temperature coefficient of approximately +0.09 %/°C, as shown in Fig.10 of the datasheet for the RD43S to RD120S group. This enables predictable V_Z drift in high-temperature environments up to 125°C ambient.

What package type does RD91S(0)-T1-AT use?

RD91S(0)-T1-AT uses the 2-pin Super Mini Mold package (equivalent to JEDEC SOD-323), with dimensions 2.5 ±0.15 mm × 1.25 ±0.1 mm × 0.9 ±0.1 mm and cathode marked by a band. This compact surface-mount package supports automated assembly and high-density PCB layouts.

RD91S(0)-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

RD91S(0)-T1-AT FAQ

1.How can I place an order for RD91S(0)-T1-AT through Aetrix?

Please submit a Request for Quotation (RFQ) for RD91S(0)-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 RD91S(0)-T1-AT reliable?

The price and inventory of RD91S(0)-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 RD91S(0)-T1-AT is usually 5 days.

3.What payment methods are accepted for RD91S(0)-T1-AT?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD91S(0)-T1-AT transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for RD91S(0)-T1-AT?

RD91S(0)-T1-AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your RD91S(0)-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 RD91S(0)-T1-AT?

For technical support, including RD91S(0)-T1-AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD91S(0)-T1-AT requirements.

6.How does Aetrix verify that RD91S(0)-T1-AT is sourced from the original manufacturer or authorized distributors?

All RD91S(0)-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 RD91S(0)-T1-AT meets industry standards.

7.What is the process for return or replacement of RD91S(0)-T1-AT?

All RD91S(0)-T1-AT units undergo pre-shipment inspection (PSI). If there is an issue with RD91S(0)-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 RD91S(0)-T1-AT part is unused and in its original packaging.

Return procedure for RD91S(0)-T1-AT:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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