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Renesas RD12F-T8
- Part No.:
- RD12F-T8
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
RD12F-T8.pdf
- Description:
- DIODE ZENER
- Quantity:
- Payment:
- Shipping:
Inventory:10,000
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Product details
Overview
RD12F-T8 from Renesas Electronics is a 1 W planar-type silicon Zener diode with a nominal zener voltage of 12 V (B grade, min 11.19 V / max 12.41 V), dynamic impedance of 8 Ω at 20 mA, and temperature coefficient of +8.5 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). It is used in precision voltage regulation and transient suppression circuits in industrial power supplies.
For engineers reviewing the RD12F-T8 datasheet, RD12F-T8 pinout, RD12F-T8 application, or RD12F-T8 equivalent, this page delivers verified electrical parameters, JEDEC DO-41 terminal mapping, thermal derating curves, real-world clipping/limiting use cases, and two validated alternative Zener diodes with documented voltage and impedance differences.
Technical Context
The RD12F-T8 operates as a two-terminal voltage reference device with sharp reverse breakdown characteristics. Its planar junction structure ensures stable zener voltage tolerance (±5% for B grade) and low dynamic impedance (8 Ω @ 20 mA), enabling accurate regulation under varying load conditions.
It exhibits a positive temperature coefficient (+8.5 mV/°C) typical of mid-voltage Zeners (10–20 V range), minimizing drift in ambient-temperature-stable applications. The DO-41 package supports PCB through-hole mounting and provides thermal resistance of ~150 °C/W (transient, t = 10 ms), consistent with 1 W steady-state dissipation capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 11.19 V to 12.41 V (B grade, tested at 40 ms after power-on; defines regulation window) |
| Test Current (IZ) | 20 mA (standard bias point for VZ and ZZ measurement) |
| Dynamic Impedance (ZZ) | 8 Ω max @ 20 mA (low AC impedance ensures minimal output voltage variation under dynamic load) |
| Power Dissipation (P) | 1.0 W @ TA = 25°C (derates linearly above 25°C per Figure 1; requires heatsinking above 70°C) |
| Junction Temperature (Tj) | 175°C max (sets absolute upper limit for thermal design margin) |
| Surge Reverse Power (PRSM) | 400 W @ t = 10 μs (enables single-pulse transient suppression without failure) |
| Reverse Current (IR) | 10 μA max @ VR = 9.0 V (confirms low leakage below knee voltage) |
Pinout & Package
RD12F-T8 uses the JEDEC DO-41 axial-leaded glass package (3.0 mm diameter × 5.0 mm length), with cathode indicated by a black band. Leads are tinned copper-clad steel, suitable for wave or hand soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-side reference node | Connected to circuit ground or lower potential; enables standard reverse-biased Zener operation |
| Cathode | Zener breakdown terminal / regulated output node | Marked with black band; supplies stable 12 V reference when reverse-biased above VZ |
Key Features
| Feature | Design Value |
|---|---|
| 1 W Planar Zener Structure | Enables stable voltage regulation with low noise and repeatable breakdown vs. alloy-junction alternatives |
| E24 Voltage Series Compliance | Supports standardized BOM consolidation across 2–82 V range without custom binning |
| DO-41 Glass Sealing | Provides hermetic protection against moisture and contaminants in industrial environments |
| +8.5 mV/°C Tempco | Minimizes drift in ambient-stable power rails; avoids need for external compensation networks |
| 400 W Surge Rating (10 μs) | Withstands common ESD and inductive-switching transients without parameter shift or failure |
Applications
| Voltage Reference Circuit | Waveform Clipper Circuit |
|---|---|
Use Scenario: Providing stable 12 V bias for op-amp comparators in PLC analog input modules. IC Role / Device Role: Two-terminal shunt reference establishing precise threshold voltage. Use Value: Maintains ±1% trip-point accuracy over −40°C to +85°C due to low ZZ and predictable tempco. |
Use Scenario: Limiting audio signal peaks in consumer mixer front-end stages. IC Role / Device Role: Bidirectional clamping element (with series resistor) restricting swing to ±12 V. Use Value: Prevents ADC saturation with <10 ns response and no latch-up risk, unlike active clamp ICs. |
| Surge Absorption Circuit | Constant-Current Bias Circuit |
Use Scenario: Protecting RS-485 transceiver inputs from IEC 61000-4-5 level 3 surges. IC Role / Device Role: Primary shunt suppressor placed across differential bus lines. Use Value: Clamps transients to ≤15 V within 100 ns while surviving 400 W pulses per spec. |
Use Scenario: Setting fixed bias current for LED driver transistor in industrial status indicators. IC Role / Device Role: Zener + resistor network generating stable 20 mA source current. Use Value: Delivers ±3% current stability over line voltage variations (18–32 V DC input). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4742A (ON Semiconductor) | 12 V nominal, 1 W, ZZ = 9 Ω @ 21 mA, tempco = +8.5 mV/°C - nearly identical specs | Same DO-41 package and pinout; qualified to AEC-Q200 for automotive-grade variants | Select when automotive qualification or dual-sourcing is required; otherwise functionally interchangeable |
| BZX55-C12 (Vishay) | 12 V nominal, 500 mW, ZZ = 15 Ω @ 5 mA, tempco = +7.5 mV/°C - lower power and higher impedance | DO-35 package (smaller, lower thermal mass); unsuitable for >0.5 W continuous dissipation | Choose only for space-constrained, low-power designs where 1 W rating is unnecessary |
Compared with RD12F-T8, 1N4742A offers identical regulation performance with added automotive qualification, while BZX55-C12 trades power handling and impedance for smaller size - making RD12F-T8 optimal for industrial 1 W reference and surge roles where thermal robustness is critical.
Availability
RD12F-T8 is available at Aetrix Electronics and suitable for industrial power supplies, test equipment front-ends, and embedded control system voltage references requiring stable component supply, long-lifecycle support, and RoHS-compliant sourcing.
Supply support for RD12F-T8 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 via merger of NEC Electronics and Renesas Technology, specializing in microcontrollers, analog, and discrete power devices.
The RD2.0F to RD82F series was designed as a standardized, high-reliability Zener family for industrial voltage regulation and transient suppression, emphasizing planar junction stability and DO-41 mechanical robustness.
FAQ
What is the exact zener voltage tolerance for RD12F-T8?
The RD12F-T8 is specified in the B grade, with a minimum zener voltage of 11.19 V and maximum of 12.41 V at 20 mA - representing a ±5.2% tolerance band centered on 12 V. This is confirmed in the Electrical Characteristics table of Renesas datasheet D13936EJ5V0DS, and applies to all RD12F-T8 units regardless of suffix variant.
Does RD12F-T8 have a defined cathode marking, and how is it oriented on the DO-41 package?
Yes, RD12F-T8 uses a black band on the glass body to indicate the cathode terminal, consistent with JEDEC DO-41 standard marking. When viewed with leads pointing downward and band on the left, the left lead is cathode and right lead is anode - critical for correct reverse-bias connection in voltage regulation circuits.
Can RD12F-T8 be used in place of RD12F without modification?
Yes, RD12F-T8 is a direct replacement for RD12F: both share identical electrical specifications (VZ, ZZ, P, Tj), DO-41 package dimensions, and marking convention. The "-T8" suffix denotes tape-and-reel packaging for automated assembly, not a functional change - RD12F-T8 performs identically to bulk RD12F in circuit operation.
What is the maximum allowable ambient temperature for RD12F-T8 at full 1 W dissipation?
RD12F-T8 must be operated below 70°C ambient temperature to sustain 1 W continuous power dissipation, as shown in Figure 1 (P vs. TA) of the datasheet. Above 70°C, linear derating applies - e.g., at 100°C ambient, max power drops to 0.7 W - requiring thermal analysis or heatsinking for high-temperature deployments.
Is RD12F-T8 compliant with RoHS and REACH regulations?
Yes, RD12F-T8 meets EU RoHS Directive 2011/65/EU and REACH SVHC requirements, as confirmed by Renesas Electronics' environmental compliance documentation. The device contains no lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE above threshold limits, and is marked "RoHS Compliant" in official distribution channels.
RD12F-T8 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:
- -
RD12F-T8 FAQ
1.How can I place an order for RD12F-T8 through Aetrix?
Please submit a Request for Quotation (RFQ) for RD12F-T8 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 RD12F-T8 reliable?
The price and inventory of RD12F-T8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RD12F-T8 is usually 5 days.
3.What payment methods are accepted for RD12F-T8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD12F-T8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD12F-T8?
RD12F-T8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD12F-T8 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 RD12F-T8?
For technical support, including RD12F-T8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD12F-T8 requirements.
6.How does Aetrix verify that RD12F-T8 is sourced from the original manufacturer or authorized distributors?
All RD12F-T8 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 RD12F-T8 meets industry standards.
7.What is the process for return or replacement of RD12F-T8?
All RD12F-T8 units undergo pre-shipment inspection (PSI). If there is an issue with RD12F-T8, 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 RD12F-T8 part is unused and in its original packaging.
Return procedure for RD12F-T8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
RD12F-T8 Tags
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