My Inquiry
My Account
Nexperia USA Inc. BZT5250H-B39X
- Part No.:
- BZT5250H-B39X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SOD-123F
- Datasheet:
-
BZT5250H-B39X.pdf
- Description:
- DIODE ZENER 39V 375MW SOD123F
- Quantity:
- Payment:
- Shipping:
Inventory:6,425
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BZT5250H-B39X from Nexperia is a low-current Zener diode in SOD123F package, designed for precision voltage regulation at 39 V nominal Zener voltage with ±5 % tolerance (C-series), specified at 50 µA test current and featuring 350 Ω differential resistance at 2 mA. It delivers stable reference voltage in battery-powered sensor nodes and low-power microcontroller reset circuits.
For engineers reviewing the BZT5250H-B39X datasheet, BZT5250H-B39X pinout, BZT5250H-B39X application, or BZT5250H-B39X equivalent, key selection criteria include its 39 V Zener voltage, 350 Ω dynamic impedance at 2 mA, 830 mW total power dissipation on optimized PCB pad, intentional leakage optimization for noise reduction, and SOD123F surface-mount compatibility.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain a stable 39 V reference under low-bias conditions (IZ = 50 µA to 2 mA), with temperature coefficient of +0.05 mV/K and diode capacitance of 45 pF at 0 V. Its thermal resistance from junction to solder point is 70 K/W when mounted on a 1 cm² cathode pad.
The device exhibits non-repetitive peak reverse power dissipation up to 40 W for 100 µs pulses and supports ambient operation from –55 °C to +150 °C. Its forward voltage is ≤ 0.9 V at 10 mA, enabling use in dual-role bias/reference paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 39 V nominal, ±5 % tolerance (C-series), measured at IZ = 2 mA - ensures predictable clamping in low-power reference rails |
| Differential Resistance (rdiff) | 350 Ω max at IZ = 2 mA - defines voltage regulation stiffness under varying load current |
| Reverse Current (IR) | ≤ 0.05 µA at VR = 31.2 V - enables ultra-low standby leakage in always-on monitoring circuits |
| Total Power Dissipation (Ptot) | 830 mW at Tamb ≤ 25 °C with 1 cm² cathode pad - sets maximum continuous DC power handling in compact layouts |
| Forward Voltage (VF) | ≤ 0.9 V at IF = 10 mA - allows bidirectional use as clamp or bias diode without excessive forward drop |
| Diode Capacitance (Cd) | 45 pF at f = 1 MHz, VR = 0 V - limits high-frequency noise coupling in analog signal conditioning paths |
| Junction Temperature (Tj) | 150 °C maximum - determines thermal derating margin in sealed or high-ambient industrial enclosures |
Pinout & Package
SOD123F plastic surface-mount package: 2.6 mm × 1.6 mm × 1.1 mm body, flat lead profile, cathode marked by bar on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (K) | Cathode | Connected to regulated output node; marking bar identifies this terminal - critical for correct polarity in shunt regulator configuration |
| 2 (A) | Anode | Connected to ground or lower-potential rail; forms reverse-biased junction with cathode to enable Zener breakdown conduction |
Key Features
| Feature | Design Value |
|---|---|
| Low-test-current specification | Rated at IZ = 50 µA - enables stable regulation in µA-level bias networks typical of IoT sensor sleep modes |
| Optimized leakage profile | Intentional minor rise in leakage per AN90031 - reduces switching transients and broadband noise in precision analog front-ends |
| Thermal performance | Rth(j-sp) = 70 K/W to cathode solder point - supports reliable operation without heatsinking in space-constrained PCBs |
| Robust surge capability | 40 W non-repetitive peak power for 100 µs - withstands ESD-induced transients in unshielded industrial interfaces |
| Standardized footprint | SOD123F outline with 2.9 mm × 1.6 mm reflow land pattern - ensures compatibility with automated assembly and IPC-7351B design rules |
Applications
| Industrial Sensor Signal Conditioning | Portable Medical Device Reference |
|---|---|
Use Scenario: Precision 39 V reference for 24-bit sigma-delta ADC biasing in wireless pressure transmitters. IC Role / Device Role / Timing Role: Shunt Zener regulator providing stable excitation voltage to bridge sensor and reference input to ADC. Use Value: 350 Ω rdiff and +0.05 mV/K TC minimize gain drift across –40 °C to +85 °C operating range. |
Use Scenario: Low-power voltage clamp for microcontroller reset circuit in battery-operated pulse oximeters. IC Role / Device Role / Timing Role: Reverse-biased Zener holding reset line at 39 V until brown-out detection triggers controlled shutdown. Use Value: 0.05 µA leakage at 31.2 V prevents premature discharge of backup coin-cell during 5-year shelf life. |
| Automotive Body Control Module Monitoring | Smart Energy Meter Auxiliary Supply |
Use Scenario: Overvoltage protection for LIN bus transceiver supply rail in door module ECUs. IC Role / Device Role / Timing Role: Clamping diode limiting transient spikes to 39 V during load dump events. Use Value: 40 W non-repetitive surge rating absorbs ISO 7637-2 Pulse 5a energy without degradation. |
Use Scenario: Secondary reference generation from 48 V DC-DC converter output in DIN-rail metering hardware. IC Role / Device Role / Timing Role: Zener-based feedback divider element stabilizing isolated flyback auxiliary winding voltage. Use Value: 830 mW Ptot with 1 cm² pad sustains continuous 15 mA bias current under full-load thermal conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZT52-C39 | Same 39 V nominal voltage, ±5 % tolerance, but rated at IZ = 5 mA (not 50 µA); rdiff = 130 Ω max | Higher test current suits higher-power bias networks; less suitable for µA-level standby regulation | Select when load current exceeds 1 mA and tighter dynamic impedance is required |
| MMSZ5250B | 39 V Zener, ±5 %, SOD-123 package, but specified at IZ = 20 mA; rdiff = 70 Ω max; Ptot = 500 mW | Higher power rating and lower impedance support active regulation loops, but higher leakage (≤ 1 µA) | Prefer for feedback paths in switching regulators where 20 mA bias is available and noise sensitivity is lower |
Compared with BZT5250H-B39X, BZT52-C39 offers lower impedance at higher current but sacrifices low-bias accuracy, while MMSZ5250B trades off leakage and thermal headroom for improved regulation stiffness in medium-current applications.
Availability
BZT5250H-B39X is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, portable medical device reference, automotive body control module monitoring, and smart energy meter auxiliary supply requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for BZT5250H-B39X 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
Nexperia is a global semiconductor expert delivering high-performance logic, discrete, and MOSFET devices with focus on efficiency, reliability, and miniaturization for industrial and consumer electronics.
The BZT5250H series belongs to Nexperia's low-current Zener diode product line, engineered specifically for precision voltage reference and clamping in battery-constrained, noise-sensitive, and thermally limited applications.
FAQ
What is the Zener voltage tolerance and test condition for BZT5250H-B39X?
The BZT5250H-B39X has a nominal Zener voltage of 39 V with ±5 % tolerance (C-series), verified at IZ = 2 mA and Tj = 25 °C. Its voltage range is 37.05 V to 40.95 V under these conditions, and it is also characterized at 50 µA for low-bias applications per datasheet Table 9.
Can BZT5250H-B39X be used in place of standard 1N4739A Zeners?
No - BZT5250H-B39X is not a direct replacement for 1N4739A. It uses a different test current (2 mA vs. 31 mA), has higher differential resistance (350 Ω vs. ~15 Ω), and is optimized for low-current operation. Substitution requires verification of bias network compliance with 50 µA–2 mA operating range and thermal layout adjustments.
What is the maximum continuous reverse power this diode can handle on a standard PCB?
At Tamb ≤ 25 °C with a 1 cm² cathode mounting pad on FR4 PCB, the BZT5250H-B39X supports up to 830 mW continuous reverse power dissipation. Derating is required above 25 °C ambient using Rth(j-a) = 150 K/W (typical) - e.g., 415 mW at 75 °C ambient.
Does the "X" suffix in BZT5250H-B39X indicate a special variant?
Yes - the "X" suffix denotes tape-and-reel packaging per standard Nexperia ordering convention (e.g., BZT5250H-B39X = SOD123F packaged in 10,000-piece reel). Electrical and thermal specifications remain identical to the base BZT5250H-B39 part; only packaging differs.
BZT5250H-B39X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZT5250H
- Package/Case:
- SOD-123F
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 39 V
- Tolerance:
- ±2%
- Power - Max:
- 375 mW
- Impedance (Max) (Zzt):
- 130 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 29.6 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123F
BZT5250H-B39X FAQ
1.How can I place an order for BZT5250H-B39X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZT5250H-B39X 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 BZT5250H-B39X reliable?
The price and inventory of BZT5250H-B39X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZT5250H-B39X is usually 5 days.
3.What payment methods are accepted for BZT5250H-B39X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZT5250H-B39X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZT5250H-B39X?
BZT5250H-B39X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZT5250H-B39X 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 BZT5250H-B39X?
For technical support, including BZT5250H-B39X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZT5250H-B39X requirements.
6.How does Aetrix verify that BZT5250H-B39X is sourced from the original manufacturer or authorized distributors?
All BZT5250H-B39X 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 BZT5250H-B39X meets industry standards.
7.What is the process for return or replacement of BZT5250H-B39X?
All BZT5250H-B39X units undergo pre-shipment inspection (PSI). If there is an issue with BZT5250H-B39X, 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 BZT5250H-B39X part is unused and in its original packaging.
Return procedure for BZT5250H-B39X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZT5250H-B39X 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
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 …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
