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Renesas RD2.2F
- Part No.:
- RD2.2F
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
RD2.2F.pdf
- Description:
- DIODE ZENER
- Quantity:
- Payment:
- Shipping:
Inventory:1,400
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Product details
Overview
RD2.2F from Renesas Electronics is a 1 W planar-type silicon Zener diode in DO-41 glass-sealed DHD (Double Heatsink Diode) package, with nominal zener voltage 2.2 V (B2 grade: 2.21–2.45 V), dynamic impedance ≤20 Ω at 40 mA, and temperature coefficient −2.0 mV/°C - used for precision voltage reference and low-voltage surge clamping in power supply feedback paths.
For engineers reviewing the RD2.2F datasheet, RD2.2F pinout, RD2.2F application, or RD2.2F equivalent, key selection criteria include its 2.2 V zener tolerance band, 1 W continuous dissipation capability, DO-41 mechanical compatibility, and −2.0 mV/°C thermal drift - critical for stable biasing in low-voltage analog circuits and overvoltage protection in 3.3 V/2.5 V systems.
Technical Context
The RD2.2F operates as a two-terminal voltage-regulating device relying on reverse-biased avalanche breakdown in a planar-diffused silicon junction. Its 2.2 V nominal zener voltage falls in the low-voltage range where zener mechanism transitions from avalanche to tunneling dominance, resulting in higher dynamic impedance and negative temperature coefficient.
It is rated for 1 W power dissipation at 25°C ambient, derating linearly above 25°C per Figure 1, and supports 400 W non-repetitive surge reverse power for 10 μs pulses. The DO-41 package provides axial lead mounting with cathode marked by black band and 25 mm minimum lead spacing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 2.21–2.45 V at IZ = 40 mA - defines stable regulation point for low-voltage reference circuits |
| Dynamic Impedance (ZZ) | ≤20 Ω at IZ = 40 mA - determines output voltage variation under load current changes |
| Power Dissipation (P) | 1.0 W at TA = 25°C - sets maximum continuous DC power handling before thermal shutdown |
| Temperature Coefficient (γZ) | −2.0 mV/°C - quantifies voltage drift with ambient temperature, critical for thermally stable references |
| Surge Reverse Power (PRSM) | 400 W for t = 10 μs - enables transient overvoltage suppression without failure |
| Reverse Current (IR) | ≤200 μA at VR = 0.7 V - ensures minimal leakage in high-impedance bias networks |
| Junction Temperature (Tj) | 175°C maximum - constrains heatsinking requirements and PCB layout for reliability |
Pinout & Package
RD2.2F uses the JEDEC-standard DO-41 axial-leaded glass package with cathode indicated by a black band. Leads are tinned copper-clad steel, 0.8 mm diameter, with 25 mm minimum spacing between lead bends. Package dimensions: 3.0 mm max body diameter, 5 mm max body length.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-side connection | Connected to ground or lower potential node in shunt regulator configuration |
| Cathode | Zener breakdown terminal / high-side connection | Connected to input or regulated node; black band identifies this terminal physically |
Key Features
| Feature | Design Value |
|---|---|
| 1 W Planar Zener Structure | Enables stable, repeatable breakdown with low noise and predictable aging in compact DO-41 form factor |
| E24 Voltage Series Compliance | Supports standardized BOM consolidation across 2–82 V zener families using industry-standard value spacing |
| DHD (Double Heatsink Diode) Construction | Improves thermal resistance via dual heat path design, enhancing power handling vs. conventional DO-41 diodes |
| B2 Grade Voltage Tightness | ±5.7% tolerance (2.21–2.45 V) enables tighter regulation than general-purpose B-grade parts |
| Negative Temperature Coefficient | −2.0 mV/°C allows compensation pairing with positive-TC components in precision references |
Applications
| Low-Voltage Power Supply Reference | Microcontroller Reset Circuit Clamping |
|---|---|
Use Scenario: Stabilizing feedback voltage in 3.3 V LDO regulators or adjustable buck converters operating near dropout. IC Role / Device Role / Timing Role: Shunt voltage reference providing precise 2.2 V threshold for error amplifier comparison. Use Value: Maintains ±1% output regulation over temperature due to matched thermal drift with op-amp inputs. |
Use Scenario: Protecting reset pin of ARM Cortex-M0 microcontrollers against ESD-induced overvoltage during hot-plug events. IC Role / Device Role / Timing Role: Low-capacitance clamp limiting reset line to 2.45 V peak during transients. Use Value: Prevents false resets while adding <0.5 ns propagation delay - no timing penalty in 100 MHz clock domains. |
| ADC Input Protection | Current Source Biasing |
Use Scenario: Safeguarding 12-bit SAR ADC analog input pins from field-induced surges in industrial sensor interfaces. IC Role / Device Role / Timing Role: Front-end overvoltage limiter placed before RC anti-aliasing filter. Use Value: Limits input to ≤2.45 V without loading signal source (IR < 0.2 μA at 1.8 V), preserving SNR > 70 dB. |
Use Scenario: Establishing stable bias current for low-noise JFET amplifiers in audio preamplifier stages. IC Role / Device Role / Timing Role: Constant-current sink configured with series resistor to set IDS. Use Value: Delivers 10.0 mA ±0.8% over −40 to +85°C using 220 Ω resistor, leveraging tight VZ tolerance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor MMBZ5221BS | 2.4 V nominal, SOD-123 surface-mount, 200 mW rating, +2.5 mV/°C TC | Not suitable for 1 W continuous operation; limited to low-power portable designs | Select when board space is constrained and thermal budget permits derated operation |
| Vishay 1N4728A | 3.3 V nominal, DO-41, 1 W, +2.0 mV/°C TC, wider tolerance (±5%) | Higher voltage incompatible with 2.2 V reference needs; positive TC prevents thermal compensation | Choose only if circuit redesign accommodates 3.3 V threshold and lacks temperature stability requirements |
Compared with RD2.2F, MMBZ5221BS trades package size and mountability for reduced power handling and opposite temperature behavior, while 1N4728A shifts regulation voltage and thermal response - neither offers drop-in replacement capability for 2.2 V precision shunt applications.
Availability
RD2.2F is available at Aetrix Electronics and suitable for industrial power supplies, embedded microcontroller protection circuits, and precision analog reference designs requiring stable component supply and long-term obsolescence management.
Supply support for RD2.2F 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 formed in 2010 through merger of NEC Electronics and Renesas Technology, specializing in microcontrollers, analog, and power devices for industrial and automotive markets.
RD2.2F belongs to Renesas' legacy planar zener diode family designed for cost-sensitive, high-reliability voltage regulation and transient suppression in standard-grade consumer and industrial equipment.
FAQ
What is the exact zener voltage range for RD2.2F at 40 mA test current?
The RD2.2F has a guaranteed zener voltage range of 2.21 V to 2.45 V when measured at IZ = 40 mA and TA = 25°C, corresponding to its B2 grade classification per Renesas datasheet D13936EJ5V0DS. This 5.7% tolerance band ensures consistent performance in low-voltage reference designs without requiring binning.
Can RD2.2F be used in place of a 2.4 V zener diode like RD2.4F?
No - RD2.2F is not interchangeable with RD2.4F because their zener voltage ranges do not overlap: RD2.2F is 2.21–2.45 V, while RD2.4F is 2.41–2.65 V. Substituting RD2.2F for RD2.4F would result in undershoot of the target regulation voltage by up to 0.24 V, potentially causing functional failure in circuits dependent on precise 2.4 V thresholds.
What is the maximum allowable reverse voltage before breakdown for RD2.2F?
The RD2.2F begins controlled zener breakdown at its specified VZ range (2.21–2.45 V); below 0.7 V reverse bias, leakage remains ≤200 μA. There is no separate "maximum reverse voltage" rating - operation above VZ is normal regulation mode, while sustained overvoltage beyond surge ratings risks thermal runaway.
Does RD2.2F meet RoHS compliance requirements?
Yes - RD2.2F complies with EU RoHS Directive 2011/65/EU as confirmed by Renesas Electronics' environmental documentation. The device contains no lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE above threshold limits, and uses lead-free tinning on DO-41 leads.
How does the −2.0 mV/°C temperature coefficient affect RD2.2F in a 0–70°C operating range?
Over 0–70°C, RD2.2F's zener voltage shifts by −140 mV (−2.0 mV/°C × 70°C), resulting in a total VZ change from ~2.45 V at 0°C to ~2.31 V at 70°C. This predictable drift enables compensation in reference circuits but requires margining in applications demanding <1% voltage stability across temperature.
RD2.2F 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:
- -
RD2.2F FAQ
1.How can I place an order for RD2.2F through Aetrix?
Please submit a Request for Quotation (RFQ) for RD2.2F 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 RD2.2F reliable?
The price and inventory of RD2.2F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RD2.2F is usually 5 days.
3.What payment methods are accepted for RD2.2F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD2.2F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD2.2F?
RD2.2F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD2.2F 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 RD2.2F?
For technical support, including RD2.2F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD2.2F requirements.
6.How does Aetrix verify that RD2.2F is sourced from the original manufacturer or authorized distributors?
All RD2.2F 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 RD2.2F meets industry standards.
7.What is the process for return or replacement of RD2.2F?
All RD2.2F units undergo pre-shipment inspection (PSI). If there is an issue with RD2.2F, 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 RD2.2F part is unused and in its original packaging.
Return procedure for RD2.2F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
RD2.2F Tags
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