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Renesas RD12ES-T2-AZ
- Part No.:
- RD12ES-T2-AZ
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
RD12ES-T2-AZ.pdf
- Description:
- DIODE ZENER
- Quantity:
- Payment:
- Shipping:
Inventory:20,000
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Product details
Overview
RD12ES-T2-AZ from Excel Semiconductor is a 12 V, 5 mA zener diode in DO-34 glass-sealed package, rated for 400 mW power dissipation and 100 W surge reverse power, used for precision voltage regulation and transient suppression in low-power analog circuits.
For engineers reviewing the RD12ES-T2-AZ datasheet, RD12ES-T2-AZ pinout, RD12ES-T2-AZ application, or RD12ES-T2-AZ equivalent, key selection factors include its 11.74–12.35 V zener voltage tolerance at 5 mA, 25 Ω dynamic impedance, 0.2 μA reverse leakage at 9.0 V, and DO-34 mechanical compatibility with 5 mm pitch PCB insertion.
Technical Context
This planar-processed zener diode operates within a junction temperature range of –65 °C to +175 °C and maintains stable regulation under DC bias or short-duration surges up to 100 W. Its E24-standardized zener voltage ensures interchangeability across common reference designs.
The device exhibits a typical zener voltage temperature coefficient near zero (per Figure 9), supports constant-current biasing via series resistor, and delivers predictable knee behavior with Zzk ≤ 110 Ω at 5 mA-enabling reliable clipping and overvoltage clamping in signal conditioning paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (Vz) | 11.74–12.35 V at 5 mA - defines nominal regulation point with ±2.6% tolerance |
| Dynamic Impedance (Zzt) | 25 Ω max at 5 mA - determines output voltage deviation under load current variation |
| Reverse Leakage (IR) | 0.2 μA max at 9.0 V - ensures minimal quiescent current in standby voltage reference circuits |
| Power Dissipation (Pv) | 400 mW at 25 °C - sets maximum continuous DC power handling on standard PCB |
| Surge Reverse Power (PRSM) | 100 W - supports transient absorption per JEDEC-defined pulse conditions |
| Junction Temperature (Tj) | –65 to +175 °C - enables operation in extended industrial environments without derating |
Pinout & Package
DO-34 glass-sealed axial package with cathode band marking; total length 29.0 ± 1.0 mm, body diameter 1.8 ± 0.2 mm, lead diameter 0.4 ± 0.1 mm, and 5 mm lead pitch for through-hole PCB insertion.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential node in reverse-biased zener configuration |
| Cathode | Zener breakdown terminal | Marked with band; connected to higher-potential node to enable regulated voltage drop |
Key Features
| Feature | Design Value |
|---|---|
| DO-34 glass package | Hermetically sealed construction ensures long-term stability and moisture resistance in harsh environments |
| Planar process technology | Delivers tight parameter distribution and repeatable zener voltage characteristics across production lots |
| E24-standardized Vz | Enables direct substitution within standardized voltage reference libraries without recalculating bias networks |
| Low knee impedance (Zzk ≤ 110 Ω) | Provides sharp turn-on behavior for waveform clipping and precision threshold detection |
Applications
| Industrial Sensor Signal Conditioning | Low-Power Microcontroller Voltage Reference |
|---|---|
Use Scenario: Stabilizing ADC reference input in 3.3 V/5 V sensor nodes exposed to ambient temperature swings. IC Role / Device Role / Timing Role: Zener diode providing fixed 12 V reference for internal LDO or external shunt regulator stage. Use Value: Maintains <±0.5% output drift over –40 to +85 °C due to low temperature coefficient and stable Zzt. | Use Scenario: Supplying clean bias voltage to op-amps and comparators in battery-powered IoT edge devices. IC Role / Device Role / Timing Role: Shunt regulator element establishing precise 12 V rail from unregulated 15 V supply. Use Value: Enables <10 μA total system quiescent current via 0.2 μA IR specification at 9 V test condition. |
| Surge-Protected RS-232 Interface | Waveform Clipping in Audio Preamp Circuits |
Use Scenario: Protecting line receiver inputs against ESD and lightning-induced transients on serial communication lines. IC Role / Device Role / Timing Role: Bidirectional clamping device limiting voltage excursions to ±12 V using back-to-back configuration. Use Value: Absorbs 100 W surge energy per JEDEC pulse definition without degradation or thermal runaway. | Use Scenario: Limiting peak amplitude of audio signals before analog-to-digital conversion to prevent clipping distortion. IC Role / Device Role / Timing Role: Symmetrical zener pair acting as soft limiter with 12 V breakdown threshold. Use Value: Delivers consistent 25 Ω dynamic impedance across 1–10 kHz band for flat frequency response in clipping function. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4742A | 12 V nominal, 1 W rating, DO-41 package, Zzt = 22 Ω at 21 mA | Higher power handling but larger footprint; requires different PCB layout | Choose when >400 mW continuous dissipation or higher surge margin is required |
| BZX55C12 | 12 V nominal, 500 mW rating, DO-35 package, Zzt = 30 Ω at 5 mA | Same power class but smaller DO-35 case; slightly higher dynamic impedance | Prefer when board space is constrained and 30 Ω Zzt remains acceptable for regulation accuracy |
Compared with RD12ES-T2-AZ, the 1N4742A offers higher surge capacity and power rating but demands DO-41 layout changes, while the BZX55C12 matches the 400–500 mW class in a smaller DO-35 form factor at the cost of marginally reduced regulation sharpness.
Availability
RD12ES-T2-AZ is available at Aetrix Electronics and suitable for industrial sensor interfaces, low-power microcontroller reference rails, and RS-232 transient protection requiring stable component supply and long-lifecycle support.
Supply support for RD12ES-T2-AZ 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
Excel Semiconductor is a China-based discrete semiconductor manufacturer specializing in zener diodes, rectifiers, and TVS devices for industrial and consumer applications.
The RDxxES series targets cost-sensitive, high-reliability voltage reference and surge suppression roles in analog signal chains and interface protection circuits.
FAQ
What is the exact zener voltage range for RD12ES-T2-AZ at 5 mA?
The RD12ES-T2-AZ has a guaranteed zener voltage range of 11.74 V to 12.35 V when tested at 5 mA DC current and 25 °C ambient temperature, per Rev. 3e datasheet page 3. This 2.6% tolerance reflects E24 standardization and is measured under specified thermal conditions to ensure repeatability across production lots of RD12ES-T2-AZ.
Can RD12ES-T2-AZ be used in surface-mount designs?
No, RD12ES-T2-AZ uses a DO-34 axial glass package designed exclusively for through-hole mounting with 5 mm lead pitch. It lacks SMD-compatible terminations or thermal pad structure. For surface-mount equivalents, consider SOD-123 or SOD-323 packaged zeners such as BZT52-B12, but note that RD12ES-T2-AZ itself requires axial PCB insertion and wave soldering or hand assembly.
What is the maximum allowable reverse voltage before breakdown for RD12ES-T2-AZ?
The RD12ES-T2-AZ begins controlled zener breakdown at its specified Vz range (11.74–12.35 V) and is characterized up to VR = 9.0 V for reverse leakage testing. Operation above 12.35 V in reverse bias is intended and safe within absolute maximum ratings-no separate "maximum non-breakdown voltage" is defined, as the device is engineered to regulate continuously in reverse conduction mode.
How does RD12ES-T2-AZ perform under elevated ambient temperatures?
RD12ES-T2-AZ maintains functional regulation up to +175 °C junction temperature. Derating begins above 25 °C ambient per Figure 6: at +70 °C ambient, its usable power drops to ~280 mW. The low temperature coefficient (near zero per Figure 9) ensures minimal Vz drift, making RD12ES-T2-AZ suitable for automotive under-hood or industrial control cabinet applications where thermal stability is critical.
Is RD12ES-T2-AZ RoHS compliant?
Yes, RD12ES-T2-AZ meets RoHS Directive 2011/65/EU requirements as confirmed by Excel Semiconductor's compliance documentation dated 2006 and updated in subsequent declarations. The DO-34 glass package contains no lead in solder seal or internal metallization, and all materials-including lead frame plating and glass envelope-are certified lead-free and halogen-free per IEC 61249-2-21.
RD12ES-T2-AZ 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:
- -
RD12ES-T2-AZ FAQ
1.How can I place an order for RD12ES-T2-AZ through Aetrix?
Please submit a Request for Quotation (RFQ) for RD12ES-T2-AZ 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 RD12ES-T2-AZ reliable?
The price and inventory of RD12ES-T2-AZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RD12ES-T2-AZ is usually 5 days.
3.What payment methods are accepted for RD12ES-T2-AZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD12ES-T2-AZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD12ES-T2-AZ?
RD12ES-T2-AZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD12ES-T2-AZ 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 RD12ES-T2-AZ?
For technical support, including RD12ES-T2-AZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD12ES-T2-AZ requirements.
6.How does Aetrix verify that RD12ES-T2-AZ is sourced from the original manufacturer or authorized distributors?
All RD12ES-T2-AZ 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 RD12ES-T2-AZ meets industry standards.
7.What is the process for return or replacement of RD12ES-T2-AZ?
All RD12ES-T2-AZ units undergo pre-shipment inspection (PSI). If there is an issue with RD12ES-T2-AZ, 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 RD12ES-T2-AZ part is unused and in its original packaging.
Return procedure for RD12ES-T2-AZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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