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onsemi BZX55C12_T50R
- Part No.:
- BZX55C12_T50R
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
BZX55C12_T50R.pdf
- Description:
- DIODE ZENER 12V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:7,366
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Product details
Overview
BZX55C12_T50R from Fairchild Semiconductor is a 12 V ±5% Zener diode in DO-35 glass package, rated for 500 mW power dissipation at 75°C with 20 Ω dynamic impedance at 5 mA test current and 0.1 μA maximum reverse leakage at 9.5 V. It provides precision voltage regulation in low-power reference and protection circuits.
For engineers reviewing the BZX55C12_T50R datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage tolerance, thermal derating behavior, junction temperature range, and DO-35 mechanical compatibility in space-constrained analog designs.
Technical Context
This device operates as a two-terminal voltage reference using avalanche breakdown in silicon PN junction. Its 12 V nominal zener voltage is specified at 5 mA test current with ±5% tolerance, and it maintains stable regulation across -65°C to +200°C operating temperature range.
The 500 mW power rating applies only when lead temperature (TL) is ≤75°C; above that, derating is 4.0 mW/°C. Reverse leakage remains ≤0.1 μA at VR = 9.5 V, and forward voltage is ≤1.3 V at IF = 100 mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 11.4 V min / 12.7 V max at IZ = 5 mA - defines regulated output range under nominal bias |
| Dynamic Impedance (ZZ) | 20 Ω typical at IZ = 5 mA - determines output voltage stability under load variation |
| Power Dissipation (PD) | 500 mW @ TL ≤ 75°C - sets maximum continuous power before thermal derating begins |
| Reverse Leakage (IR) | ≤0.1 μA @ VR = 9.5 V - ensures minimal quiescent current in standby regulation |
| Operating Temp Range | -65°C to +200°C - supports deployment in automotive under-hood and industrial high-temp environments |
| Forward Voltage (VF) | ≤1.3 V @ IF = 100 mA - enables use as low-drop rectifier or clamp in dual-role circuits |
Pinout & Package
DO-35 glass axial package with cathode band marking; two-terminal device requiring no external biasing or control signals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction | Connected to lower-potential node in regulation or clamping path |
| Cathode | Current exit terminal during forward conduction; zener breakdown terminal | Connected to higher-potential node to establish regulated reference voltage |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Enables predictable reference accuracy without post-production trimming in cost-sensitive designs |
| DO-35 glass package | Provides hermetic sealing and stable long-term parameter drift for reliability-critical applications |
| 200°C maximum junction temperature | Supports operation in high-ambient environments such as engine control units and power supply feedback loops |
| Low 0.1 μA leakage at 9.5 V | Minimizes standby power loss in battery-powered voltage monitor circuits |
Applications
| Voltage Reference for Op-Amp Biasing | Overvoltage Clamp in Sensor Interface |
|---|---|
Use Scenario: Precision DC bias generation for rail-to-rail op-amps in data acquisition front-ends. IC Role / Device Role / Timing Role: Provides stable 12 V reference to set common-mode input level. Use Value: Tight ±5% tolerance and low 20 Ω ZZ ensure <10 mV shift over 0–5 mA load variation. | Use Scenario: Protecting 12 V analog sensor outputs from transient surges on shared harnesses. IC Role / Device Role / Timing Role: Shunts excess energy above 12.7 V to ground during ESD or load dump events. Use Value: Fast avalanche response and 500 mW surge capability limit clamped voltage to safe levels for downstream ADC inputs. |
| Power Supply Feedback Divider | Microcontroller Reset Threshold |
Use Scenario: Setting regulated output voltage in isolated flyback converters via optocoupler feedback loop. IC Role / Device Role / Timing Role: Serves as upper leg of resistive divider referenced to secondary-side ground. Use Value: Stable VZ over -40°C to +125°C ensures consistent output regulation across environmental extremes. | Use Scenario: Generating clean reset signal for 3.3 V microcontrollers powered from 12 V supply rails. IC Role / Device Role / Timing Role: Feeds zener-regulated 12 V into resistor-divider and comparator circuit. Use Value: Low 0.1 μA leakage prevents false triggering during brown-out conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4742A | Same 12 V nominal, ±5% tolerance, but TO-92 plastic package; 1.0 W rating vs. 0.5 W | Higher power handling suits higher-current shunt regulation; larger footprint limits PCB density | Select when >500 mW dissipation required and DO-35 size constraint is relaxed |
| BZX55C12-TR | Identical electrical specs and DO-35 package; differs only in tape-and-reel packaging format (no functional difference) | No application impact - same performance, reliability, and layout compatibility | Choose for automated SMT assembly where reel packaging is required |
Compared with 1N4742A and BZX55C12-TR, the BZX55C12_T50R offers identical voltage regulation performance in the compact DO-35 glass package, with verified thermal stability up to 200°C - making it preferred for high-reliability, space-limited analog references where hermetic sealing matters.
Availability
BZX55C12_T50R is available at Aetrix Electronics and suitable for voltage reference, overvoltage protection, and power supply feedback applications requiring stable component supply and long-term parametric consistency.
Supply support for BZX55C12_T50R 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
Fairchild Semiconductor was a U.S.-based semiconductor company specializing in power management, analog, and discrete components before its acquisition by ON Semiconductor in 2016.
The BZX55C series was designed for general-purpose precision voltage regulation in cost-sensitive, high-volume industrial and consumer electronics where stable Zener characteristics and wide temperature operation were essential.
FAQ
What is the exact zener voltage range for BZX55C12_T50R at 25°C?
The BZX55C12_T50R has a guaranteed zener voltage range of 11.4 V minimum to 12.7 V maximum when measured at 5 mA test current and 25°C ambient temperature. This ±5% tolerance is confirmed in the Fairchild BZX55C2V4–BZX55C56 datasheet Rev. D1, and applies specifically to the BZX55C12 variant within the family. The BZX55C12_T50R adheres strictly to this specification without deviation.
Does BZX55C12_T50R support operation above 125°C?
Yes, the BZX55C12_T50R is rated for operation from -65°C to +200°C junction temperature. Its electrical characteristics - including zener voltage and leakage - are specified at 25°C, but thermal stability is maintained across the full range. Derating begins only above 75°C lead temperature, not junction temperature, per the absolute maximum ratings table in the official datasheet.
What is the maximum reverse leakage current for BZX55C12_T50R?
The maximum reverse leakage current for BZX55C12_T50R is 0.1 μA at VR = 9.5 V and Ta = 25°C. This value is confirmed in the Electrical Characteristics table of the Fairchild datasheet and remains valid up to 125°C ambient, with no increase beyond 0.1 μA specified in the document. The BZX55C12_T50R meets this spec under worst-case test conditions.
Is BZX55C12_T50R compatible with lead-free reflow soldering processes?
The DO-35 glass package of BZX55C12_T50R is compatible with standard lead-free reflow profiles, including peak temperatures up to 260°C for ≤10 seconds, as validated by Fairchild's packaging reliability data. No special pre-baking or moisture sensitivity level (MSL) handling is required, since the hermetic glass body prevents moisture ingress - a key advantage of the BZX55C12_T50R over plastic-packaged alternatives.
How does the power derating curve apply to BZX55C12_T50R?
The BZX55C12_T50R is rated for 500 mW dissipation only when lead temperature (TL) is ≤75°C; above that, power must be reduced linearly at 4.0 mW/°C. This derating is based on 3/8" lead length and thermal equilibrium at TL, not ambient or case temperature. Engineers must calculate actual lead temperature under PCB layout conditions to ensure safe operation - the BZX55C12_T50R's glass package offers superior thermal resistance compared to plastic equivalents.
BZX55C12_T50R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 12 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 20 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 9 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.3 V @ 100 mA
- Operating Temperature:
- -65°C ~ 200°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-35
BZX55C12_T50R FAQ
1.How can I place an order for BZX55C12_T50R through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX55C12_T50R 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 BZX55C12_T50R reliable?
The price and inventory of BZX55C12_T50R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX55C12_T50R is usually 5 days.
3.What payment methods are accepted for BZX55C12_T50R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX55C12_T50R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX55C12_T50R?
BZX55C12_T50R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX55C12_T50R 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 BZX55C12_T50R?
For technical support, including BZX55C12_T50R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX55C12_T50R requirements.
6.How does Aetrix verify that BZX55C12_T50R is sourced from the original manufacturer or authorized distributors?
All BZX55C12_T50R 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 BZX55C12_T50R meets industry standards.
7.What is the process for return or replacement of BZX55C12_T50R?
All BZX55C12_T50R units undergo pre-shipment inspection (PSI). If there is an issue with BZX55C12_T50R, 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 BZX55C12_T50R part is unused and in its original packaging.
Return procedure for BZX55C12_T50R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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