My Inquiry
My Account
Vishay General Semiconductor - Diodes Division BZM55C51-TR
- Part No.:
- BZM55C51-TR
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- Single Zener Diodes
- Package:
- 2-SMD, No Lead
- Datasheet:
-
BZM55C51-TR.pdf
- Description:
- DIODE ZENER 51V 500MW MICROMELF
- Quantity:
- Payment:
- Shipping:
Inventory:4,140
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BZM55C51-TR from Vishay Semiconductors is a silicon planar Zener diode in MicroMELF (SOD-80) package, designed for precision voltage regulation and reference applications. It delivers a nominal Zener voltage of 51 V at 2.5 mA test current, with dynamic resistance of 125 Ω, temperature coefficient of +0.04 %/K at 25 °C, and reverse leakage current < 0.1 μA at 39 V, suitable for low-drift analog references in industrial power supplies.
For engineers reviewing the BZM55C51-TR datasheet, BZM55C51-TR pinout, BZM55C51-TR application, or BZM55C51-TR equivalent, key selection criteria include Zener voltage tolerance (48–54 V), thermal stability across -65 to +175 °C, low-noise operation, hermetic glass-sealed construction, and compatibility with reflow/wave soldering per J-STD-020 MSL level 1.
Technical Context
The BZM55C51-TR employs a planar-diffused silicon junction optimized for sharp reverse breakdown and high long-term stability. Its Zener voltage exhibits a positive temperature coefficient (+0.04 %/K at 25 °C, +0.12 %/K at 125 °C), indicating improved regulation under elevated ambient conditions compared to lower-voltage variants.
Designed for single-diode configuration, it operates within 500 mW total power dissipation (Tamb = 25 °C, RthJA ≤ 300 K/W), with forward voltage of 1.5 V at 200 mA and junction temperature limit of 175 °C - enabling use in compact, thermally constrained voltage-reference circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener voltage (VZ) | 48–54 V nominal 51 V at IZT = 2.5 mA - defines stable regulation point for feedback networks |
| Dynamic resistance (ZZ) | 125 Ω at IZT = 2.5 mA - determines load regulation error sensitivity to current variation |
| Reverse leakage (IR) | < 0.1 μA at VR = 39 V - ensures minimal quiescent current in high-impedance bias/reference paths |
| Temperature coefficient | +0.04 %/K at 25 °C - enables predictable VZ drift compensation in wide-temperature designs |
| Power dissipation | 500 mW - sets maximum continuous power handling on standard epoxy-glass PCBs |
| Junction temperature | 175 °C - supports operation in harsh environments including industrial motor controls and power converters |
| Package | MicroMELF (SOD-80) - hermetically sealed glass body with 1.2 mm diameter, enabling high reliability and moisture resistance |
Pinout & Package
MicroMELF (SOD-80) package: cylindrical glass body with axial leads; cathode identified by surface band; dimensions: 1.8 mm length × 1.2 mm diameter; weight ≈ 12 mg; UL 94 V-0 molding compound; MSL level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / reference ground node | Connected to circuit common in shunt regulator configurations; carries forward current up to 200 mA |
| Cathode | Zener breakdown terminal / regulated output node | Provides stable 51 V reference when reverse-biased; must be held at higher potential than anode |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass sealing | Prevents moisture ingress and parameter drift over decades - critical for aerospace and medical calibration references |
| Very sharp reverse characteristic | Enables precise clamping and low-knee-voltage regulation without soft turn-on ambiguity |
| Low reverse leakage current | < 0.1 μA at 39 V ensures negligible loading on high-impedance op-amp feedback networks |
| High stability and low noise | Supports sub-ppm/h drift in precision references; avoids signal corruption in sensitive analog front-ends |
| Fits SOD-323 footprint compatibility | Enables drop-in replacement evaluation on existing layouts despite MicroMELF mechanical form factor |
Applications
| Industrial Power Supply Reference | Automotive ECU Voltage Clamp |
|---|---|
Use Scenario: Stabilizing feedback voltage in isolated DC-DC converters for PLC I/O modules. IC Role / Device Role / Timing Role: Shunt Zener reference providing 51 V setpoint to TL431 error amplifier input. Use Value: Tight 48–54 V tolerance and +0.04 %/K TC ensure ±0.5 % output regulation over -40 to +105 °C ambient. | Use Scenario: Overvoltage protection for 48 V battery management system monitoring circuits. IC Role / Device Role / Timing Role: Clamping transient spikes above 51 V to protect ADC inputs and microcontroller GPIOs. Use Value: Low 125 Ω dynamic resistance limits clamping voltage overshoot during fast transients (e.g., load dump). |
| Test Equipment Calibration Standard | Telecom Line Interface Protection |
Use Scenario: Serving as primary voltage reference in portable multimeter internal DAC calibration. IC Role / Device Role / Timing Role: Precision Zener element in temperature-compensated reference ladder network. Use Value: Hermetic seal and < 0.1 μA leakage maintain long-term accuracy (< 20 ppm/year drift) without recalibration. | Use Scenario: Protecting Ethernet PHY interface from induced surges on outdoor PoE lines. IC Role / Device Role / Timing Role: Secondary clamping stage after primary TVS, absorbing residual energy at 51 V threshold. Use Value: Sharp knee and high stability prevent false triggering while ensuring robust secondary protection coordination. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZM55B51-TR | Narrower VZ tolerance (50–52 V vs. 48–54 V); same 2.5 mA IZT, 125 Ω ZZ, +0.04 %/K TC | Better suited for tight-tolerance feedback loops where 51.0 ± 1.0 V is required | Select BZM55B51-TR when absolute voltage accuracy outweighs drift margin; BZM55C51-TR preferred for thermal robustness in variable-temperature systems |
| 1N4733A-T | Dual-in-line DO-41 package; 51 V nominal, ±5 % tolerance; 17 Ω ZZ; higher leakage (≤ 5 μA) | Higher power (1 W) but larger footprint and inferior stability/noise performance | Choose 1N4733A-T only for legacy through-hole designs requiring higher power; BZM55C51-TR offers superior miniaturization and long-term drift control |
Compared with BZM55B51-TR and 1N4733A-T, the BZM55C51-TR balances wider voltage tolerance with superior thermal stability and hermetic reliability - making it optimal for space-constrained, high-reliability industrial references where long-term calibration integrity is critical.
Availability
BZM55C51-TR is available at Aetrix Electronics and suitable for industrial power supplies, automotive ECUs, test equipment calibration, and telecom line interfaces requiring stable component supply with traceable sourcing and lifecycle continuity.
Supply support for BZM55C51-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 high-reliability diodes, MOSFETs, optoelectronics, and passive components for demanding industrial, automotive, and computing applications.
The BZM55-Series targets precision voltage reference and stabilization needs in compact, high-stability systems - emphasizing hermetic sealing, low noise, and wide-temperature performance over cost-driven general-purpose use.
FAQ
What is the Zener voltage tolerance of the BZM55C51-TR?
The BZM55C51-TR has a Zener voltage range of 48 V to 54 V at 2.5 mA test current, with nominal value 51 V. This ±6 % tolerance reflects its "C" grade classification per Vishay's BZM55-Series specification, balancing accuracy and manufacturability for industrial-grade references. The BZM55C51-TR is not rated for tighter tolerances like the "B" grade (50–52 V).
Can the BZM55C51-TR be used in surface-mount reflow processes?
Yes, the BZM55C51-TR in MicroMELF (SOD-80) package is qualified for reflow soldering with peak temperature up to 260 °C per J-STD-020 MSL level 1. Its glass-body construction and axial lead geometry require appropriate pad layout per Vishay's recommended footprints (1.4 × 0.9 mm for reflow), and thermal profiling must avoid thermal shock to the hermetic seal.
How does the temperature coefficient of the BZM55C51-TR affect its regulation accuracy?
The BZM55C51-TR exhibits a +0.04 %/K temperature coefficient at 25 °C and +0.12 %/K at 125 °C, meaning its Zener voltage increases predictably with temperature. This positive drift allows designers to compensate for other negative-coefficient components in the system, improving overall thermal stability - especially valuable in unregulated power rails where ambient shifts exceed 50 °C.
Is the BZM55C51-TR suitable for low-current reference applications?
Yes, the BZM55C51-TR draws less than 0.1 μA reverse leakage current at 39 V, making it ideal for ultra-low-power reference nodes in battery-operated instrumentation or high-impedance sensor biasing. Its 2.5 mA test current is standardized for specification; actual operating current can be reduced to 100 μA or lower while maintaining usable regulation, though dynamic resistance rises accordingly.
What is the maximum power dissipation rating for the BZM55C51-TR?
The BZM55C51-TR has a maximum total power dissipation of 500 mW at Tamb = 25 °C with RthJA ≤ 300 K/W. Derating is required above 25 °C - approximately 3.3 mW/°C - down to zero at 175 °C junction temperature. This rating assumes mounting on epoxy-glass PCB with specified copper area; exceeding it risks parametric shift or catastrophic failure.
BZM55C51-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Series:
- BZM55
- Package/Case:
- 2-SMD, No Lead
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 51 V
- Tolerance:
- -
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 700 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 39 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.5 V @ 200 mA
- Operating Temperature:
- -65°C ~ 175°C
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- MicroMELF
BZM55C51-TR FAQ
1.How can I place an order for BZM55C51-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for BZM55C51-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 BZM55C51-TR reliable?
The price and inventory of BZM55C51-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZM55C51-TR is usually 5 days.
3.What payment methods are accepted for BZM55C51-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZM55C51-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZM55C51-TR?
BZM55C51-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZM55C51-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 BZM55C51-TR?
For technical support, including BZM55C51-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZM55C51-TR requirements.
6.How does Aetrix verify that BZM55C51-TR is sourced from the original manufacturer or authorized distributors?
All BZM55C51-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 BZM55C51-TR meets industry standards.
7.What is the process for return or replacement of BZM55C51-TR?
All BZM55C51-TR units undergo pre-shipment inspection (PSI). If there is an issue with BZM55C51-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 BZM55C51-TR part is unused and in its original packaging.
Return procedure for BZM55C51-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZM55C51-TR Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
Tech Hub
Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.
Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
