UDZS27B RR Taiwan Semiconductor Zener Diode (Other) In Stock
Taiwan Semiconductor UDZS27B RR is a 27 V Zener diode in a compact SOD-323 surface mount package rated at 200 mW power dissipation with a ±5% voltage tolerance, ideal for precision voltage clamping and regulation in portable electronics. It features a reverse voltage of 27 V, a low junction capacitance, and fast reverse recovery suitable for high-frequency noise suppression. Available from authorized distributors with worldwide shipping.
- Manufacturer
- Taiwan Semiconductor
- Package
- Other
- Pin Count
- 2
- Lifecycle
- ACTIVE
- Datasheet
- UDZS27B RR Datasheet PDF
- Category
- Zener Diode
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 27 V nominal Zener voltage with ±5% tolerance for reliable voltage clamping and reference applications up to 200 mW power dissipation
- Compact SOD-323 surface mount package occupying less than 5 mm² PCB area, optimized for space-constrained portable and wearable electronics
- Low leakage current and tight Zener voltage tolerance ensure stable voltage regulation across the operating temperature range of -55 °C to +150 °C
- Fast reverse recovery time suitable for transient suppression and noise filtering in high-frequency switching power supply feedback networks
- RoHS-compliant construction with tape-and-reel (RR) packaging for automated SMT pick-and-place assembly at high volume
Applications
The UDZS27B RR is widely used for voltage clamping, overvoltage protection, and precision reference in portable consumer electronics, IoT sensor nodes, and battery-powered devices where the 27 V, 200 mW Zener characteristic provides reliable protection for downstream circuitry. In switching power supply designs, it serves as a feedback reference clamp in flyback converters and PWM controllers operating at voltages near 27 V. Its compact SOD-323 package and tape-and-reel format make it ideal for high-volume SMT production in LED driver modules and low-power industrial sensor circuits.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What is the Zener voltage and power rating of the UDZS27B RR, and what does the ±5% tolerance mean for circuit design?
The UDZS27B RR has a nominal Zener voltage of 27 V with a ±5% tolerance, meaning the actual breakdown voltage ranges from 25.65 V to 28.35 V. It is rated for 200 mW continuous power dissipation. Designers must account for this tolerance when setting clamp thresholds in overvoltage protection circuits, ensuring the protected rail always stays at least 1 V to 2 V below the clamp level across production variation.
Which PCB package does the UDZS27B RR use, and how does its size benefit portable device designs?
The UDZS27B RR is housed in the SOD-323 surface mount package, which measures approximately 1.7 mm x 1.25 mm and occupies less than 5 mm² of PCB footprint. This compact size is ideal for space-constrained portable electronics, wearable devices, and IoT sensor nodes where board area budgets are under 100 mm² and multiple protection diodes must fit within a single PCB region.
In which power supply topologies is the UDZS27B RR commonly used as a voltage reference or clamp?
The UDZS27B RR is commonly used in flyback converter feedback networks, PWM controller clamp circuits, and linear regulator reference chains operating near 27 V. Its 200 mW power rating is sufficient for feedback snubber applications where peak transient current is limited to below 7 mA. It also provides overvoltage clamping on 24 V industrial sensor supply rails where transient spikes can exceed 27 V and must be suppressed to protect downstream ICs.
What operating temperature range does the UDZS27B RR support for industrial and automotive designs?
The UDZS27B RR operates across a junction temperature range of -55 °C to +150 °C, with a power derating of 1.6 mW/°C above 25 °C ambient. At 85 °C ambient, the derated maximum power dissipation is approximately 104 mW, which must be factored into thermal design for industrial control boards and automotive accessory circuits requiring reliable 27 V Zener clamping across wide temperature environments.
How does tape-and-reel (RR) packaging of UDZS27B RR support high-volume automated assembly?
The RR suffix indicates the UDZS27B RR ships on tape-and-reel in standard 7-inch or 13-inch reels, compatible with 8 mm carrier tape for automated pick-and-place machines. This allows placement of thousands of SOD-323 Zener diodes per hour in high-volume SMT lines, eliminating manual handling and ensuring consistent polarity orientation on the PCB footprint for reflow soldering profiles up to 260 °C per JEDEC J-STD-020.
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