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
What are the key features of UDZS27B RR?
- 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
What is UDZS27B RR used for?
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) |
Where can I find the UDZS27B RR datasheet?
UDZS27B RR Datasheet DownloadOfficial datasheet from Taiwan Semiconductor
What are equivalent replacements for UDZS27B RR?
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.
Related Guides
C0402C103K3RACTU Selection Guide: Choosing a 10 nF 0402 MLCC
Select C0402C103K3RACTU by voltage margin, X7R behavior, tolerance, 0402 assembly risk, and qualified alternatives.
Aug 4, 2026
STM32H753VIT6 MCU Selection Guide: Memory, Package, Connectivity, and Security
Choose STM32H753VIT6 by evaluating memory architecture, LQFP-100 pin fit, connectivity, security, power, and sourcing tradeoffs.
Aug 4, 2026
STM32H753VIT6 High-Performance MCU Design Guide
Practical STM32H753VIT6 design guidance for power, clocks, memory, DMA, PCB layout, bring-up, and production recovery.
Aug 3, 2026
STM32H753ZIT6 Selection Guide for High-Performance Embedded Systems
Select the STM32H753ZIT6 by evaluating compute, memory, LQFP144 pinout, power, interfaces, security, and sourcing requirements.
Aug 3, 2026
Why Buy from FindMyChip
About Taiwan Semiconductor
Taiwan Semiconductor is a leading electronic component manufacturer. FindMyChip sources Taiwan Semiconductor ICs directly from authorized China distributors, offering competitive pricing and reliable stock.
In Stock · 24h Response · Worldwide Shipping
Response within 24 hours · Worldwide shipping
“FindMyChip sourced our entire STM32 BOM in 48 hours when our usual distributor had 16-week lead times.”
You May Also Like
KDZVTR15B
ROHM Semiconductor
Zener Diode
KDZVTR36B
ROHM Semiconductor
Zener Diode
KDZVTR5.6B
ROHM Semiconductor
Zener Diode
KDZVTR24B
ROHM Semiconductor
Zener Diode
KDZVTR6.2B
ROHM Semiconductor
Zener Diode
KDZVTR18B
ROHM Semiconductor
Zener Diode
KDZLVTFTR68
ROHM Semiconductor
Zener Diode
KDZLVTFTR56
ROHM Semiconductor
Zener Diode
KDZTR24B
ROHM Semiconductor
Zener Diode
KDZVTR5.1B
ROHM Semiconductor
Zener Diode
BZX84C2V4-E3-08
Vishay
Zener Diode
BZT52C15-E3-08
Vishay
Zener Diode
3SMAJ5927B-TP
Micro Commercial Components (MCC)
Zener Diode
BZT52C5V1S-7-F
Diodes Inc.
Zener Diode
SMAZ5V6-TP
Micro Commercial Components (MCC)
Zener Diode
BZX84C10-E3-08
Vishay
Zener Diode
BZX84J-B24,115
Nexperia
Zener Diode
BZX84C39-E3-08
Vishay
Zener Diode
BZT52C12T-7
Diodes Inc.
Zener Diode
JANTX1N4620UR-1
Microsemi Corporation
Zener Diode
SMBJ5350B-TP
Micro Commercial Components (MCC)
Zener Diode
CD0603-Z13
Bourns
Zener Diode
TZX5V1B-TAP
Vishay
Zener Diode
AZ23C5V6-E3-08
Vishay
Zener Diode