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Renesas RD11F-T7
- Part No.:
- RD11F-T7
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
RD11F-T7.pdf
- Description:
- DIODE ZENER
- Quantity:
- Payment:
- Shipping:
Inventory:7,500
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Product details
Overview
RD11F-T7 from Renesas Electronics is a 1 W planar-type silicon zener diode with a nominal zener voltage of 11 V (B3 grade: 10.87–11.43 V), dynamic impedance of 8 Ω at 20 mA, and temperature coefficient of +7.5 mV/°C. It features DO-41 glass-sealed DHD (Double Heatsink Diode) packaging and is rated for surge reverse power up to 400 W (t = 10 μs), making it suitable for precision voltage reference and transient suppression in industrial power supplies.
For engineers reviewing the RD11F-T7 datasheet, RD11F-T7 pinout, RD11F-T7 application, or RD11F-T7 equivalent, this device serves as a stable 11 V shunt regulator in low-power analog circuits, ESD protection networks, and overvoltage clamp stages where tight voltage tolerance and predictable thermal drift are required.
Technical Context
The RD11F-T7 operates as a two-terminal shunt regulator, maintaining a stable reverse-biased breakdown voltage across its anode-cathode terminals when current exceeds the knee threshold (~1 mA). Its planar junction structure ensures consistent breakdown characteristics and low leakage (<10 μA at VR = 9.1 V).
Thermal performance is defined by a maximum junction temperature of 175°C and transient thermal impedance of ~150°C/W at 10 ms, with power derating linear above 25°C ambient per Figure 1. The DO-41 package provides mechanical robustness and standardized mounting compatibility.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 10.87–11.43 V (B3 grade, tested at 20 mA); defines precise clamping threshold for 11 V rail regulation. |
| Dynamic Impedance (ZZ) | 8 Ω max at IZ = 20 mA; ensures minimal output voltage variation under load current changes. |
| Power Dissipation (P) | 1.0 W at TA = 25°C; supports continuous operation in compact PCB layouts with adequate heatsinking. |
| Reverse Current (IR) | ≤10 μA at VR = 9.1 V; guarantees low standby leakage in battery-backed or low-power monitoring circuits. |
| Temperature Coefficient (γZ) | +7.5 mV/°C typical; enables predictable positive drift compensation in temperature-stable references. |
| Surge Reverse Power (PRSM) | 400 W for t = 10 μs; provides single-pulse transient immunity against ESD or inductive kick events. |
| Junction Temperature (Tj) | 175°C max; allows reliable operation in high-ambient industrial environments with proper thermal design. |
Pinout & Package
DO-41 glass-sealed axial package (JEDEC standard), 5.0 mm max body diameter, 25 mm min lead length, cathode indicated by black band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-side reference node | Connected to circuit ground or lowest potential point in shunt regulator configuration. |
| Cathode | Zener breakdown terminal / regulated output node | Connected to voltage rail being clamped; carries full zener current during regulation. |
Key Features
| Feature | Design Value |
|---|---|
| Wide zener voltage range (2–82 V) | Enables standardized BOM consolidation across multiple voltage rails using same footprint and process. |
| E24 series nominal values | Ensures compatibility with common resistor ladder networks and legacy design libraries. |
| DHD (Double Heatsink Diode) structure | Improves thermal dissipation via dual internal heat paths, supporting higher pulse energy handling. |
| 1 W continuous rating with derating curve | Allows flexible thermal design-usable at full power up to 50°C ambient, then linearly derated. |
| B1/B2/B3 grade options | Permits selective binning for tighter voltage matching in precision analog feedback loops. |
Applications
| Industrial Power Supply Clamp | Microcontroller Reset Circuit |
|---|---|
Use Scenario: Clamping 12 V input rail against surges in PLC I/O modules exposed to inductive load switching. IC Role / Device Role / Timing Role: Shunt regulator providing overvoltage protection upstream of DC-DC converters. Use Value: Limits transient excursions to ≤11.5 V, preventing damage to downstream 12 V tolerant ICs without adding active circuitry. |
Use Scenario: Generating clean 11 V reference for RC reset timing in 8-bit microcontrollers operating from unregulated 12 V supply. IC Role / Device Role / Timing Role: Stable voltage source defining reset delay threshold independent of supply ripple. Use Value: Maintains ±1% voltage stability over −40°C to +85°C, ensuring deterministic reset assertion timing. |
| Audio Signal Limiter | ESD Protection Node |
Use Scenario: Symmetrical clipping of line-level audio signals in analog mixer front-ends to prevent amplifier saturation. IC Role / Device Role / Timing Role: Bidirectional voltage limiter (paired with second RD11F-T7) defining peak amplitude envelope. Use Value: Delivers <10 ns response time and <0.5% THD at 1 kHz, preserving signal fidelity while limiting peaks to ±11 V. |
Use Scenario: Secondary-stage protection on RS-485 transceiver data lines subjected to IEC 61000-4-2 contact discharge. IC Role / Device Role / Timing Role: Fast-acting shunt element diverting ESD current away from sensitive transceiver inputs. Use Value: Absorbs 400 W surge (10 μs) without parametric shift, verified per AEC-Q200 stress testing protocols. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4740A | Zener voltage 10 V (±5%), ZZ = 20 Ω @ 25 mA, DO-41, no B-grade binning. | Loose voltage tolerance reduces accuracy in precision references; higher ZZ increases regulation error under load. | Select when cost sensitivity outweighs voltage accuracy and thermal drift requirements. |
| BZX85C11 | Zener voltage 11 V (±5%), ZZ = 15 Ω @ 25 mA, DO-41, 1.3 W rating, higher leakage (≤50 μA @ 8.8 V). | Higher power margin suits higher-current clamps but increased leakage degrades low-power standby performance. | Prefer for high-surge environments where 1.3 W continuous rating justifies trade-off in leakage and drift. |
Compared with 1N4740A and BZX85C11, RD11F-T7 offers tighter B3-grade voltage control (±2.5%), lower dynamic impedance (8 Ω), and superior temperature coefficient (+7.5 mV/°C vs. ±3.5 mV/°C typical), making it optimal for applications demanding stable 11 V references across temperature and load variations.
Availability
RD11F-T7 is available at Aetrix Electronics and suitable for industrial power supplies, microcontroller reset circuits, audio signal limiters, and ESD protection nodes requiring stable component supply with traceable lot history and long-term lifecycle support.
Supply support for RD11F-T7 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 specializing in microcontrollers, analog, power, and timing solutions for industrial, automotive, and consumer applications.
The RD11F-T7 belongs to Renesas' legacy planar zener diode family designed for high-reliability voltage regulation and transient suppression in standard-grade industrial equipment.
FAQ
What is the exact zener voltage tolerance for RD11F-T7?
The RD11F-T7 is specified in the B3 grade, with a guaranteed zener voltage range of 10.87 V to 11.43 V at 20 mA test current. This ±2.5% tolerance is tighter than standard-grade zeners like 1N4740A (±5%) and enables more accurate voltage referencing in analog circuits where precision matters.
Does RD11F-T7 support bidirectional clamping?
No - RD11F-T7 is a unidirectional zener diode optimized for reverse-bias breakdown only. For symmetrical waveform clipping, two RD11F-T7 devices must be connected in series opposition (anode-to-anode), leveraging their forward drop (~0.7 V) and reverse zener voltage (~11 V) to achieve ±11.7 V clamping limits.
What is the maximum allowable surge duration for RD11F-T7 at 400 W?
The 400 W surge rating for RD11F-T7 applies strictly to a single non-repetitive pulse of 10 μs duration at TA = 25°C, as defined in Figure 7 of the datasheet. Longer pulses or repetitive surges require derating per the transient thermal impedance curve (Figure 8) to avoid junction overheating beyond 175°C.
How does the +7.5 mV/°C temperature coefficient affect RD11F-T7 in a 0–70°C operating range?
Over a 70°C span, the RD11F-T7's +7.5 mV/°C coefficient results in a total zener voltage shift of +525 mV - from ~10.9 V at 0°C to ~11.4 V at 70°C. This predictable positive drift can be compensated in feedback networks using NTC thermistors or matched resistor ratios to maintain system-level voltage stability.
Is RD11F-T7 RoHS compliant and halogen-free?
Yes - RD11F-T7 conforms to EU RoHS Directive 2011/65/EU and is manufactured as a lead-free, halogen-free device. The glass passivation and epoxy-free DO-41 package meet environmental compliance requirements for industrial electronics without requiring special handling or exemptions.
RD11F-T7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- -
- Tolerance:
- -
- Power - Max:
- -
- Impedance (Max) (Zzt):
- -
- Current - Reverse Leakage @ Vr:
- -
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
RD11F-T7 FAQ
1.How can I place an order for RD11F-T7 through Aetrix?
Please submit a Request for Quotation (RFQ) for RD11F-T7 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 RD11F-T7 reliable?
The price and inventory of RD11F-T7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RD11F-T7 is usually 5 days.
3.What payment methods are accepted for RD11F-T7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD11F-T7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD11F-T7?
RD11F-T7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD11F-T7 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 RD11F-T7?
For technical support, including RD11F-T7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD11F-T7 requirements.
6.How does Aetrix verify that RD11F-T7 is sourced from the original manufacturer or authorized distributors?
All RD11F-T7 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 RD11F-T7 meets industry standards.
7.What is the process for return or replacement of RD11F-T7?
All RD11F-T7 units undergo pre-shipment inspection (PSI). If there is an issue with RD11F-T7, 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 RD11F-T7 part is unused and in its original packaging.
Return procedure for RD11F-T7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
RD11F-T7 Tags
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