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Vishay General Semiconductor - Diodes Division BZX55B4V7-TR
- Part No.:
- BZX55B4V7-TR
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
BZX55B4V7-TR.pdf
- Description:
- DIODE ZENER 4.7V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:27,948
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Product details
Overview
BZX55B4V7-TR from Vishay Semiconductors is a precision 4.7 V Zener diode in DO-35 package, designed for voltage regulation and reference applications with ±1% nominal tolerance (4.6–4.8 V), 5 mA test current, < 0.5 μA reverse leakage at 1 V, and 80 Ω dynamic resistance at 1 kHz. It delivers stable reference performance in low-power analog circuits and power supply feedback loops.
For engineers reviewing the BZX55B4V7-TR datasheet, BZX55B4V7-TR pinout, BZX55B4V7-TR application, or BZX55B4V7-TR equivalent, key selection criteria include zener voltage accuracy, temperature coefficient (–0.05 to +0.02 %/K), thermal resistance (300 K/W), power dissipation (500 mW), and DO-35 package compatibility with through-hole PCB layouts.
Technical Context
The BZX55B4V7-TR operates as a two-terminal voltage reference device with sharp reverse breakdown characteristics and low noise. Its zener voltage is specified at 5 mA test current (IZT1) and exhibits a temperature coefficient ranging from –0.05 %/K at 25 °C to +0.02 %/K at 150 °C, enabling predictable drift behavior across industrial temperature ranges.
It features a maximum dynamic resistance of 80 Ω at 1 kHz and 5 mA, ensuring minimal AC impedance in regulation paths. With a maximum reverse leakage current of 0.5 μA at VR = 1 V and forward voltage ≤1.5 V at 200 mA, it supports both precision clamping and low-current biasing functions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 4.6–4.8 V at IZT = 5 mA - tight 1% tolerance enables accurate voltage referencing without trimming. |
| Power Dissipation (Ptot) | 500 mW at TL = 25 °C with 4 mm lead length - defines maximum steady-state thermal load in standard mounting. |
| Dynamic Resistance (ZZ) | ≤80 Ω at f = 1 kHz, IZT = 5 mA - ensures low AC impedance for stable regulation under varying load conditions. |
| Reverse Leakage (IR) | < 0.5 μA at VR = 1 V - minimizes quiescent current loss in battery-powered or high-impedance reference nodes. |
| Temperature Coefficient (TKVZ) | –0.05 to +0.02 %/K - supports predictable voltage drift compensation over –65 to +175 °C operating range. |
| Junction-to-Ambient RthJA | 300 K/W - determines thermal rise per watt; requires adequate PCB copper or lead length management for reliability. |
| Forward Voltage (VF) | ≤1.5 V at IF = 200 mA - allows use as low-drop rectifier or clamp in dual-polarity protection schemes. |
Pinout & Package
DO-35 (DO-204AH) glass axial package, 3.9 mm max body diameter, 26 mm min lead length, cathode identified by band. Total weight ≈125 mg. UL 94 V-0 molding compound, MSL level 1, peak soldering temperature 260 °C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; connected to lower potential in zener mode | Required for proper polarity in voltage reference or clamping configurations - reversal causes open-circuit behavior. |
| Cathode | Current exit terminal in forward bias; marked with band; higher potential in zener mode | Must be biased positive relative to anode to activate zener breakdown; critical for correct orientation on PCB. |
Key Features
| Feature | Design Value |
|---|---|
| Very sharp reverse characteristic | Enables precise, low-hysteresis voltage clamping with minimal knee voltage spread across production lots. |
| Low reverse current level | Sub-microamp leakage at 1 V reverse bias preserves signal integrity and extends battery life in portable references. |
| Very high stability | Guaranteed long-term voltage drift <1% after 1000 hrs at rated power - suitable for unadjusted instrumentation. |
| Low noise | Minimal broadband noise generation supports clean DC references in audio, sensor, and ADC front-end circuits. |
Applications
| Industrial Power Supply Feedback | Microcontroller Voltage Reference |
|---|---|
Use Scenario: Regulating output voltage in isolated flyback or buck-derived auxiliary supplies. IC Role / Device Role / Timing Role: Zener reference element in optocoupler feedback loop or TL431 bias network. Use Value: Tight 4.7 V tolerance and low dynamic resistance maintain ±1% output regulation across line/load variations. |
Use Scenario: Providing stable analog reference for internal ADCs or external DACs in embedded controllers. IC Role / Device Role / Timing Role: Low-noise, low-drift voltage source replacing higher-cost bandgap references where 1% accuracy suffices. Use Value: Sub-μA leakage and –0.05 to +0.02 %/K TKVZ enable stable readings across –40 to +85 °C ambient. |
| Overvoltage Protection Clamp | Signal Level Shifting |
Use Scenario: Protecting I/O pins of FPGAs, microcontrollers, or sensors against ESD or transient overvoltage. IC Role / Device Role / Timing Role: Bidirectional clamping device (anode-to-ground, cathode-to-signal) limiting excursion to 4.7 V + VF. Use Value: Sharp breakdown and 80 Ω dynamic resistance limit clamping voltage overshoot during fast transients. |
Use Scenario: Biasing logic-level interfaces between 3.3 V and 5 V domains using passive level translation. IC Role / Device Role / Timing Role: Cathode-connected to 5 V rail, anode driving 3.3 V node - sets offset voltage via zener drop. Use Value: Predictable 4.7 V breakdown enables repeatable 0.3 V headroom margin for 3.3 V tolerant inputs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4732A-T | 5% tolerance (4.47–4.94 V), 100 Ω ZZ, 1 W rating, DO-41 package | Higher power handling but looser voltage spec; larger footprint | Select when higher power margin is needed and ±5% regulation is acceptable. |
| BZX85C4V7 | 5% tolerance (4.47–4.94 V), 100 Ω ZZ, 1.3 W rating, DO-41 package | Higher Ptot and thermal mass; less suitable for space-constrained boards | Prefer for high-reliability industrial supplies where derating and long-term stability outweigh size constraints. |
Compared with BZX55B4V7-TR, the 1N4732A-T and BZX85C4V7 offer higher power ratings but wider voltage tolerances and larger DO-41 packages - making BZX55B4V7-TR preferable for compact, precision-limited designs requiring 1% VZ accuracy and DO-35 compatibility.
Availability
BZX55B4V7-TR is available at Aetrix Electronics and suitable for industrial power supplies, microcontroller reference circuits, overvoltage protection networks, and signal level-shifting interfaces requiring stable component supply and consistent parametric performance across production batches.
Supply support for BZX55B4V7-TR 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
Vishay Semiconductors is a global leader in discrete semiconductors, specializing in diodes, MOSFETs, optoelectronics, and passive components with emphasis on reliability, precision, and automotive-grade qualification.
The BZX55-Series is part of Vishay's small-signal Zener portfolio engineered for voltage stabilization in cost-sensitive, space-constrained applications where tight tolerance, low noise, and long-term stability are essential.
FAQ
What is the exact zener voltage tolerance of BZX55B4V7-TR?
The BZX55B4V7-TR has a guaranteed zener voltage range of 4.6 V to 4.8 V at 5 mA test current, corresponding to ±1% nominal tolerance around 4.7 V. This specification is verified per Vishay Document 85604 Rev. 2.0 and applies strictly under Tamb = 25 °C with pulse testing to avoid self-heating effects. The BZX55B4V7-TR maintains this tolerance across production lots without calibration.
Can BZX55B4V7-TR be used in surface-mount designs?
No - the BZX55B4V7-TR uses a DO-35 (DO-204AH) axial glass package with 26 mm minimum lead length, designed exclusively for through-hole mounting. It lacks SMD-compatible terminations or tape-and-reel packaging for pick-and-place. For SMT alternatives, consider Vishay's PLASTIC-packaged BZX84-B4V7 or ON Semiconductor's MMBZ5225BS, not the BZX55B4V7-TR.
What is the maximum allowable continuous power dissipation for BZX55B4V7-TR?
The BZX55B4V7-TR has a maximum continuous power dissipation (Ptot) of 500 mW at TL = 25 °C with 4 mm lead length. Derating is required above 25 °C ambient: approximately 1.67 mW/°C reduction beyond 25 °C, based on its 300 K/W junction-to-ambient thermal resistance. Exceeding this limit risks irreversible parametric shift or catastrophic failure. The BZX55B4V7-TR must be operated within this envelope for rated lifetime.
How does temperature affect the zener voltage of BZX55B4V7-TR?
The BZX55B4V7-TR exhibits a temperature coefficient (TKVZ) of –0.05 %/K at 25 °C and +0.02 %/K at 150 °C, indicating a crossover point near 70–80 °C where drift is minimized. Over the full –65 to +175 °C range, total VZ shift remains within ±3%, validated by Vishay's Fig. 3 and Fig. 4. This behavior is intrinsic to the BZX55B4V7-TR's silicon process and cannot be compensated externally.
Is BZX55B4V7-TR suitable for low-noise analog reference applications?
Yes - the BZX55B4V7-TR is explicitly characterized for low noise in Vishay's datasheet (Document 85604), with "low noise" listed as a core feature. Its sharp reverse characteristic and sub-μA leakage contribute to minimal broadband noise injection into sensitive nodes. When decoupled with ≥100 nF ceramic capacitance and operated at 5 mA, the BZX55B4V7-TR delivers stable, low-ripple reference voltage suitable for 12-bit ADCs and precision op-amp biasing.
BZX55B4V7-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Series:
- BZX55
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 4.7 V
- Tolerance:
- ±2%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 80 Ohms
- Current - Reverse Leakage @ Vr:
- 500 nA @ 1 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.5 V @ 200 mA
- Operating Temperature:
- -65°C ~ 175°C
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AH (DO-35)
BZX55B4V7-TR FAQ
1.How can I place an order for BZX55B4V7-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX55B4V7-TR 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 BZX55B4V7-TR reliable?
The price and inventory of BZX55B4V7-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX55B4V7-TR is usually 5 days.
3.What payment methods are accepted for BZX55B4V7-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX55B4V7-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX55B4V7-TR?
BZX55B4V7-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX55B4V7-TR 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 BZX55B4V7-TR?
For technical support, including BZX55B4V7-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX55B4V7-TR requirements.
6.How does Aetrix verify that BZX55B4V7-TR is sourced from the original manufacturer or authorized distributors?
All BZX55B4V7-TR 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 BZX55B4V7-TR meets industry standards.
7.What is the process for return or replacement of BZX55B4V7-TR?
All BZX55B4V7-TR units undergo pre-shipment inspection (PSI). If there is an issue with BZX55B4V7-TR, 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 BZX55B4V7-TR part is unused and in its original packaging.
Return procedure for BZX55B4V7-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX55B4V7-TR Tags
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