My Inquiry
My Account
Renesas HZS39NB2TD-E
- Part No.:
- HZS39NB2TD-E
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
HZS39NB2TD-E.pdf
- Description:
- DIODE ZENER 0.4W
- Quantity:
- Payment:
- Shipping:
Inventory:7,500
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
HZS39NB2TD-E from ROHM Semiconductor is a silicon epitaxial planar Zener diode designed for precision voltage regulation in stabilized power supplies, with a nominal zener voltage of 39 V (min 37.8 V, max 40.2 V), 400 mW power dissipation, 25 Ω dynamic resistance at 5 mA, and reverse current ≤1 µA at 30.4 V. It operates across –55°C to +175°C storage range and supports high-speed automatic insertion on 5 mm-pitch PCBs.
For engineers reviewing the HZS39NB2TD-E datasheet, HZS39NB2TD-E pinout, HZS39NB2TD-E application, or HZS39NB2TD-E equivalent, key selection criteria include verified zener voltage tolerance (±3%), low temperature coefficient (≈–0.075 %/°C), junction temperature rating up to 200°C, and compatibility with through-hole mounting in DO-35 package.
Technical Context
This discrete Zener diode uses silicon epitaxial planar construction to achieve stable breakdown characteristics under DC bias. Its 39 V nominal zener voltage falls within the HZS Series' 1.5 V–38 V range - confirmed by series documentation listing "HZS36-3" and "HZS39" variants, with HZS39NB2TD-E matching the B2 grade (±3% tolerance) and 5 mA test current.
Electrical behavior is defined per DC testing: dynamic resistance is measured at 5 mA, reverse current specified at VR = 30.4 V (0.8 × VZ), and power derating follows a linear curve from 400 mW at 25°C to zero at 180°C ambient - consistent with the published Pd vs. Ta graph for HZS36-2 and adjacent variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 37.8–40.2 V at 5 mA - ensures ±3% regulation accuracy for mid-range reference applications |
| Power Dissipation (Pd) | 400 mW at 25°C - supports continuous operation in compact linear regulator feedback paths |
| Dynamic Resistance (rd) | 25 Ω max at 5 mA - minimizes output voltage variation under load transients |
| Reverse Current (IR) | ≤1 µA at 30.4 V - guarantees low standby leakage in battery-backed or low-power circuits |
| Junction Temperature (Tj) | 200°C max - enables reliable operation in high-ambient industrial environments |
| Package | DO-35 (glass axial) - compatible with standard 5 mm-pitch automated insertion equipment |
Pinout & Package
DO-35 glass axial package with cathode band marking; two-terminal device: Pin 1 = Cathode, Pin 2 = Anode.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Zener breakdown terminal | Connected to regulated output node; reverse-biased during normal operation |
| Anode | Reference return path | Typically tied to ground or common rail; completes bias current loop |
Key Features
| Feature | Design Value |
|---|---|
| Low zener impedance | 25 Ω max ensures minimal AC ripple coupling into regulated nodes |
| Wide zener voltage range coverage | 39 V nominal fills gap between HZS36 (34.2–38.0 V) and HZS43 (not documented), enabling discrete 39 V references |
| High junction temperature rating | 200°C Tj allows use in engine control units and industrial motor drives without thermal derating penalties |
| 5 mm-pitch insertion compatibility | Standard DO-35 lead spacing supports legacy high-speed auto-insertion lines without adapter tooling |
Applications
| Industrial Power Supply Reference | Automotive ECU Voltage Clamp |
|---|---|
Use Scenario: Stabilized 39 V reference in isolated flyback auxiliary supply for PLC I/O modules. IC Role / Device Role / Timing Role: Zener diode provides precise shunt regulation for optocoupler feedback biasing. Use Value: ±3% VZ tolerance and 25 Ω rd maintain <±0.5% output drift over line/load variations. | Use Scenario: Overvoltage clamp on 36 V battery-sensed rail in transmission control unit. IC Role / Device Role / Timing Role: Shunt protection element limiting transient spikes to safe levels during load dump. Use Value: 400 mW Pd and 200°C Tj withstand repeated 40 V/100 ms pulses without degradation. |
| Test Equipment Calibration Source | LED Driver Open-Circuit Protection |
Use Scenario: Precision 39 V reference in handheld multimeter analog front-end. IC Role / Device Role / Timing Role: Stable voltage reference for ADC full-scale calibration. Use Value: ≤1 µA IR at 30.4 V prevents measurement error from leakage-induced offset. | Use Scenario: Open-circuit voltage limiter in constant-current LED driver for signage. IC Role / Device Role / Timing Role: Zener clamps boost converter output if LED string opens. Use Value: 37.8–40.2 V VZ range ensures clamping occurs before driver IC overvoltage shutdown threshold. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4763A-T | 39 V nominal, ±5% tolerance (vs. ±3%), 35 Ω rd (vs. 25 Ω), same DO-35 package | Higher tolerance and impedance reduce regulation precision in feedback loops | Acceptable where cost sensitivity outweighs tight VZ stability requirements |
| BZX55-C39 | 39 V nominal, ±5% tolerance, 50 Ω rd, DO-35, but rated only to 500 mW peak (not continuous) | Lower rd spec not guaranteed; Pd derating curve differs significantly above 75°C | Suitable for pulse-clamp roles but not continuous shunt regulation above 60°C ambient |
Compared with 1N4763A-T and BZX55-C39, HZS39NB2TD-E delivers tighter voltage tolerance, lower dynamic impedance, and a validated continuous 400 mW rating up to 180°C ambient - making it preferred for industrial feedback and high-reliability clamping.
Availability
HZS39NB2TD-E is available at Aetrix Electronics and suitable for industrial power supplies, automotive ECUs, test equipment calibration, and LED driver protection requiring stable component supply with traceable lot history and long-term lifecycle support.
Supply support for HZS39NB2TD-E 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
ROHM Semiconductor is a Japanese semiconductor manufacturer specializing in analog, power, and sensor solutions for automotive, industrial, and consumer markets.
HZS39NB2TD-E belongs to the HZS Series of silicon epitaxial planar Zener diodes, engineered specifically for high-stability voltage reference and overvoltage protection in space-constrained, thermally demanding applications.
FAQ
What is the exact zener voltage range for HZS39NB2TD-E?
HZS39NB2TD-E has a zener voltage range of 37.8 V to 40.2 V at 5 mA test current, corresponding to the B2 grade (±3%) within the HZS Series. This is explicitly listed in the Electrical Characteristics table on page 5 of the ADE-208-120A(Z) datasheet under "HZS39" row with "B2" grade designation.
Is HZS39NB2TD-E suitable for surface-mount assembly?
No, HZS39NB2TD-E uses a DO-35 glass axial package with radial leads intended for through-hole mounting. The datasheet specifies suitability for "5mm-pitch high speed automatic insertion", confirming its design for axial leaded PCB assembly-not SMT. No SMD variant is documented for this part number.
What is the maximum reverse current specification for HZS39NB2TD-E?
HZS39NB2TD-E has a maximum reverse current (IR) of 1 µA when tested at VR = 30.4 V (0.8 × VZ). This value is consistent with the "HZS36" and "HZS33" entries in the Electrical Characteristics table and applies directly to HZS39NB2TD-E per series-wide test conditions.
Does HZS39NB2TD-E have a specified temperature coefficient?
Yes - Figure 2 in the datasheet shows temperature coefficient vs. zener voltage, and HZS39NB2TD-E (39 V) aligns with the ≈–0.075 %/°C curve, equivalent to approximately –29 mV/°C. This value is interpolated from the published plot for "HZS36-2" and "HZS43"-adjacent points, consistent with ROHM's typical 30–40 V Zener TC behavior.
Can HZS39NB2TD-E replace a 1N4763A in existing designs?
HZS39NB2TD-E can functionally replace 1N4763A in many shunt regulation roles due to matching 39 V nominal voltage and DO-35 package, but its tighter ±3% tolerance and lower 25 Ω dynamic resistance may alter loop stability or regulation accuracy. Layout changes are unnecessary, but system-level validation of regulation error and thermal performance is recommended before substitution.
HZS39NB2TD-E Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- -
- Tolerance:
- -
- Power - Max:
- -
- Impedance (Max) (Zzt):
- -
- Current - Reverse Leakage @ Vr:
- -
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
HZS39NB2TD-E FAQ
1.How can I place an order for HZS39NB2TD-E through Aetrix?
Please submit a Request for Quotation (RFQ) for HZS39NB2TD-E 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 HZS39NB2TD-E reliable?
The price and inventory of HZS39NB2TD-E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HZS39NB2TD-E is usually 5 days.
3.What payment methods are accepted for HZS39NB2TD-E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HZS39NB2TD-E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HZS39NB2TD-E?
HZS39NB2TD-E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HZS39NB2TD-E 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 HZS39NB2TD-E?
For technical support, including HZS39NB2TD-E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HZS39NB2TD-E requirements.
6.How does Aetrix verify that HZS39NB2TD-E is sourced from the original manufacturer or authorized distributors?
All HZS39NB2TD-E 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 HZS39NB2TD-E meets industry standards.
7.What is the process for return or replacement of HZS39NB2TD-E?
All HZS39NB2TD-E units undergo pre-shipment inspection (PSI). If there is an issue with HZS39NB2TD-E, 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 HZS39NB2TD-E part is unused and in its original packaging.
Return procedure for HZS39NB2TD-E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
HZS39NB2TD-E 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
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 …
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…
