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Taiwan Semiconductor Corporation BZT52B51 RHG
- Part No.:
- BZT52B51 RHG
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Zener Diodes
- Package:
- SOD-123F
- Datasheet:
-
BZT52B51 RHG.pdf
- Description:
- DIODE ZENER 51V 500MW SOD123F
- Quantity:
- Payment:
- Shipping:
Inventory:2,818
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Product details
Overview
BZT52B51 RHG from Taiwan Semiconductor is a surface-mount 51 V ±2% tolerance Zener diode in SOD-123F package, rated for 500 mW power dissipation, with 180 Ω dynamic impedance at 2 mA test current and 0.045 μA reverse leakage at 35.7 V, used for precision voltage regulation and overvoltage protection in low-power analog circuits.
For engineers reviewing the BZT52B51 RHG datasheet, BZT52B51 RHG pinout, BZT52B51 RHG application, or BZT52B51 RHG equivalent, key selection criteria include zener voltage tolerance (±2%), thermal resistance (350 °C/W), cathode-band polarity marking, moisture sensitivity level 1, and halogen-free green compound compliance per IEC 61249-2-21.
Technical Context
The BZT52B51 RHG operates as a silicon planar junction Zener diode optimized for stable voltage reference and clamping in ambient temperatures from −65 °C to +150 °C. Its 51.00 V nominal zener voltage is specified at IZT = 2 mA with ZZT = 180 Ω, and it maintains VBR ≥ 49.98 V at IZK = 0.5 mA with ZZK = 376 Ω.
Designed for reflow soldering at 260 °C/10 s, the device features matte tin-plated terminals over nickel underplate, RoHS-compliant lead-free construction, and SOD-123F mechanical outline (3.3–3.9 mm length, 1.5–1.7 mm width, 0.5–0.7 mm height) with cathode band polarity indication.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 49.98–52.02 V @ IZT = 2 mA - ensures tight regulation window for 51 V reference designs |
| Power Dissipation (PD) | 500 mW - supports continuous operation up to ~10 mA at 51 V without derating below 25 °C |
| Dynamic Impedance (ZZT) | 180 Ω @ IZT = 2 mA - defines small-signal AC impedance affecting regulation stability under load variation |
| Reverse Leakage (IR) | 0.045 μA @ VR = 35.7 V - enables ultra-low standby current in battery-backed protection circuits |
| Thermal Resistance (RθJA) | 350 °C/W - requires careful PCB copper area planning to maintain TJ < 150 °C at full PD |
| Operating Temperature | −65 °C to +150 °C - qualified for industrial and automotive under-hood environments |
| Package | SOD-123F - compact 3.6 × 1.6 × 0.6 mm surface-mount footprint compatible with standard SMT pick-and-place |
Pinout & Package
Two-terminal device in SOD-123F plastic package: anode (unmarked end) and cathode (band-marked end). Polarity is unambiguous per JEDEC standard; no internal bonding wires or substrate connections beyond the two leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener reference ground node | Connected to lower-potential side of regulated circuit; must sink current during zener conduction |
| Cathode | Zener breakdown terminal / regulated output node | Marked by visible band; supplies stable 51 V when reverse-biased above VZ; connects to supply rail being clamped |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance | Enables single-supply 51 V reference accuracy without post-assembly trimming or calibration |
| Halogen-free green compound | Meets IEC 61249-2-21 for environmentally compliant manufacturing and end-of-life disposal |
| Moisture Sensitivity Level 1 | Eliminates bake preconditioning before reflow, reducing production cycle time and cost |
| 260 °C/10 s soldering guarantee | Withstands standard lead-free reflow profiles without parametric shift or delamination |
| Matte tin/Ni lead finish | Ensures reliable solder wetting and intermetallic formation per MIL-STD-202 Method 208 |
Applications
| Industrial Sensor Signal Conditioning | USB-C Power Delivery Clamp |
|---|---|
|
Use Scenario: Stabilizing excitation voltage for 4–20 mA loop-powered pressure transmitters operating from 24 V rails. IC Role / Device Role / Timing Role: Zener reference diode providing precise 51 V clamp to protect op-amp input stages from transient surges. Use Value: Prevents damage from induced lightning surges while maintaining <0.05 μA leakage that avoids loading low-current sensor outputs. |
Use Scenario: Overvoltage protection on USB-C CC lines during hot-plug events where VBUS may couple noise into control logic. IC Role / Device Role / Timing Role: Standby-mode shunt clamp limiting CC line voltage to 51 V during fault conditions. Use Value: Blocks >35 V transients with sub-μA leakage, preserving USB-C enumeration timing integrity and avoiding false disconnect detection. |
| Programmable Logic Controller I/O Protection | Automotive Body Control Module Reference |
|
Use Scenario: Protecting 24 V digital input channels against load dump and ISO 7637-2 pulse 5a transients. IC Role / Device Role / Timing Role: Fast-response shunt regulator clamping input nodes to safe voltage during 100 ms surge events. Use Value: Withstands 500 mW peak dissipation for 10 ms pulses and maintains stable VZ across −40 °C to +85 °C operating range. |
Use Scenario: Providing stable 51 V reference for LIN bus voltage monitor circuitry in door module ECUs. IC Role / Device Role / Timing Role: Precision voltage reference enabling accurate detection of battery undervoltage/overvoltage thresholds. Use Value: ±2% tolerance ensures threshold accuracy within 1.02 V over temperature, meeting AEC-Q101 stress requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5251B-7-F (Diodes Inc.) | Same 51 V ±2%, but SOT-23 package (higher RθJA = 400 °C/W); VF = 0.9 V @ 10 mA vs. 1.0 V typical for BZT52B51 RHG | Higher thermal resistance limits continuous power in confined layouts; smaller footprint saves board space | Select when board real estate is constrained and thermal margin allows derating to 350 mW |
| SZBZX84-B51LT1G (ON Semi) | 51 V ±5% tolerance; SOT-23 package; 410 mW rating; IR = 0.1 μA @ 35.7 V (2.2× higher leakage) | Looser tolerance increases reference uncertainty; higher leakage affects ultra-low-power monitoring | Select only for non-critical clamping where cost is primary and 5% VZ variation is acceptable |
Compared with MMBZ5251B-7-F and SZBZX84-B51LT1G, the BZT52B51 RHG delivers tighter voltage tolerance, lower leakage, and superior thermal performance in the industry-standard SOD-123F footprint-making it preferred for precision regulation and high-reliability industrial applications.
Availability
BZT52B51 RHG is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, USB-C power delivery clamp circuits, and programmable logic controller I/O protection requiring stable component supply and long-term lifecycle support.
Supply support for BZT52B51 RHG 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
Taiwan Semiconductor is a vertically integrated analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in high-reliability power management and signal conditioning components.
The BZT52B51 RHG belongs to Taiwan Semiconductor's Small Signal Product family, engineered for precision voltage reference and transient suppression in space-constrained, thermally demanding industrial and automotive systems.
FAQ
What is the maximum steady-state zener current (IZM) for BZT52B51 RHG?
The maximum steady-state zener current IZM for BZT52B51 RHG is 35.7 mA, calculated from PD = 500 mW and VZ = 51 V (IZM = PD / VZ). This value assumes operation at 25 °C ambient with adequate PCB heat sinking; derating is required above 25 °C per the admissible power dissipation curve in DS_S1405026.
Does BZT52B51 RHG meet automotive qualification standards?
BZT52B51 RHG is not AEC-Q101 qualified, though it operates across −65 °C to +150 °C and supports automotive-adjacent applications like body control modules. For production automotive use, Taiwan Semiconductor recommends verifying qualification status per specific lot documentation and consulting their automotive product roadmap for AEC-Q101 variants.
What does the 'RHG' suffix indicate in BZT52B51 RHG?
The 'RHG' suffix in BZT52B51 RHG denotes SOD-123F package (RH) and halogen-free green compound (G), per Taiwan Semiconductor's ordering information. It confirms compliance with IEC 61249-2-21 and RoHS Directive 2011/65/EU, distinguishing it from non-green variants.
How is the zener voltage tested for BZT52B51 RHG?
Zener voltage for BZT52B51 RHG is tested under a 10 ms pulse condition per Note 1 in DS_S1405026, using IZT = 2 mA. This method avoids self-heating errors during measurement and ensures repeatability across production lots, yielding the specified 49.98–52.02 V range at 25 °C ambient.
Can BZT52B51 RHG be used in series for higher voltage references?
Yes, BZT52B51 RHG can be cascaded in series to achieve higher reference voltages (e.g., two devices yield ~102 V), but matching unit-to-unit VZ tolerance and thermal coupling must be considered. Uneven heating may cause current hogging; external balancing resistors are recommended for stable series operation.
BZT52B51 RHG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Series:
- -
- Package/Case:
- SOD-123F
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 51 V
- Tolerance:
- ±2%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 180 Ohms
- Current - Reverse Leakage @ Vr:
- 45 nA @ 35.7 V
- Voltage - Forward (Vf) (Max) @ If:
- 1 V @ 10 mA
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123F
BZT52B51 RHG FAQ
1.How can I place an order for BZT52B51 RHG through Aetrix?
Please submit a Request for Quotation (RFQ) for BZT52B51 RHG 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 BZT52B51 RHG reliable?
The price and inventory of BZT52B51 RHG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZT52B51 RHG is usually 5 days.
3.What payment methods are accepted for BZT52B51 RHG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT52B51 RHG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZT52B51 RHG?
BZT52B51 RHG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZT52B51 RHG 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 BZT52B51 RHG?
For technical support, including BZT52B51 RHG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT52B51 RHG requirements.
6.How does Aetrix verify that BZT52B51 RHG is sourced from the original manufacturer or authorized distributors?
All BZT52B51 RHG 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 BZT52B51 RHG meets industry standards.
7.What is the process for return or replacement of BZT52B51 RHG?
All BZT52B51 RHG units undergo pre-shipment inspection (PSI). If there is an issue with BZT52B51 RHG, 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 BZT52B51 RHG part is unused and in its original packaging.
Return procedure for BZT52B51 RHG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZT52B51 RHG Tags
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MM5Z5V1ST1G
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