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STMicroelectronics LDP24ARL
- Part No.:
- LDP24ARL
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- R-6, Axial
- Datasheet:
-
LDP24ARL.pdf
- Description:
- TVS DIODE 24VWM 40VC R6
- Quantity:
- Payment:
- Shipping:
Inventory:480
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Product details
Overview
LDP24ARL from STMicroelectronics is a transient voltage suppressor (TVS) diode designed specifically for automotive load dump protection in 24 V systems. It features a 24 V stand-off voltage (VRM), 25–32 V breakdown voltage (VBR at 1 mA), 40 V clamping voltage (VCL at 85 °C), and 30 A peak pulse current (IPP, 40 ms pulse). It is used in engine control units (ECUs) to safeguard microcontrollers and power MOSFETs against ISO 7637-2 Pulse 5 surges.
For engineers reviewing the LDP24ARL datasheet, LDP24ARL pinout, LDP24ARL application, or LDP24ARL equivalent, key selection criteria include clamping voltage under thermal stress (40 V @ 85 °C), junction-to-ambient thermal resistance (15 °C/W on infinite heatsink), load dump compliance per ISO/DTR 7637, and R6 package mechanical compatibility with high-power PCB layouts.
Technical Context
The LDP24ARL operates as a unidirectional avalanche TVS diode, triggered when reverse voltage exceeds its VBR threshold (min 25 V, typ 28 V at 25 °C). Its clamping behavior is characterized by low dynamic impedance during transient events, limiting voltage across protected ICs to ≤40 V at 30 A under elevated junction temperature (85 °C).
It is rated for 100 V peak pulse load dump overvoltage (Tamb = 85 °C) and supports non-repetitive surge currents up to 500 A (tp = 10 ms, Tj initial = 25 °C). Thermal performance is defined by Rth(j-a) = 15 °C/W (Llead = 10 mm), enabling stable operation up to Tj = 175 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRM | 24 V - Maximum continuous reverse operating voltage before leakage exceeds 50 µA at 25 °C. |
| VBR (min/typ) | 25 / 28 V - Breakdown occurs within this range at 1 mA, defining turn-on threshold for load dump suppression. |
| VCL | 40 V - Clamped voltage at 30 A IPP and 85 °C junction temperature, directly limiting stress on downstream 3.3 V/5 V logic. |
| IPP | 30 A - Peak pulse current capability under 40 ms exponential waveform, matching ISO 7637-2 Pulse 5 test profile. |
| C (at 0 V) | 8000 pF - Junction capacitance impacts high-frequency noise coupling; relevant for CAN/LIN bus line protection layout. |
| Rth(j-a) | 15 °C/W - Thermal resistance determines required copper area and heatsinking for sustained 5 W dissipation at Tamb = 100 °C. |
| IFSM | 500 A - Non-repetitive surge forward current rating ensures robustness during battery reversal or cranking transients. |
Pinout & Package
Package: R6 plastic case (axial leaded, DO-201AD compatible), weight 2.048 g, UL94-V0 compliant resin. Dimensions: A = 8.6–9.1 mm length, B = 25.4 mm body length, ∅C = 8.6–9.1 mm diameter, ∅D = 1.2–1.3 mm lead diameter.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Cathode reference | Connected to ground or low-side return path; defines polarity for unidirectional clamping. |
| Cathode | Reverse voltage input / Clamp node | Connected to protected 24 V rail; conducts avalanche current during overvoltage to limit VCL. |
Key Features
| Feature | Design Value |
|---|---|
| ISO 7637-2 Pulse 5 compliance | Validated for 86.5 V, 200 ms surge with 10 ms rise time - meets automotive ECU immunity requirements. |
| High-temperature clamping stability | VCL remains ≤40 V at Tj = 85 °C, ensuring consistent protection during under-hood thermal stress. |
| Low thermal resistance | Rth(j-a) = 15 °C/W enables 5 W continuous dissipation without external heatsink on standard FR4 PCB. |
| Robust surge handling | 500 A IFSM (10 ms) and 100 V VPP rating support survival during severe alternator load dump events. |
Applications
| Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
Use Scenario: Protects MCU power rails and CAN transceivers during alternator load dump in diesel/gasoline engine compartments. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between 24 V battery rail and local DC-DC converter input. Use Value: Limits transient voltage to ≤40 V, preventing latch-up or gate oxide damage in 5 V/3.3 V regulators and microcontrollers. | Use Scenario: Shields LIN bus drivers and power window motor drivers from battery voltage spikes during ignition cycling. IC Role / Device Role / Timing Role: Primary overvoltage protection device on 24 V supply input to BCM power management IC. Use Value: Withstands 30 A IPP pulses while maintaining <500 µA leakage at 24 V, minimizing standby current drain. |
| Commercial Vehicle Telematics | Truck HVAC Control Unit |
Use Scenario: Safeguards GPS/GSM modem power inputs exposed to long cable runs and high-inductance alternator loads. IC Role / Device Role / Timing Role: First-stage transient suppressor ahead of wide-input buck converters (e.g., 4.5–42 V). Use Value: 8000 pF capacitance is acceptable for <1 MHz DC-DC switching frequencies, avoiding regulation instability. | Use Scenario: Secures BLDC motor driver ICs and temperature sensors against load dump in cab-mounted HVAC controllers. IC Role / Device Role / Timing Role: Parallel-connected TVS on main 24 V distribution node feeding multiple subsystems. Use Value: 175 °C max junction temperature allows operation in sealed enclosures with ambient up to 105 °C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar load dump protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ24A | DO-214AA package, lower Ppp rating (600 W vs 1200 W), VCL = 38.9 V @ 32.4 A. | Suitable for lower-energy transients; not validated for full ISO 7637-2 Pulse 5 (200 ms). | Select when board space is constrained and peak pulse energy is <150 J. |
| 1.5KE27A | DO-201AE package, higher VBR (28.9–31.9 V), VCL = 41.4 V @ 36.2 A, IFSM = 200 A. | Limited to 200 A surge; insufficient for heavy-duty truck load dump profiles. | Prefer for cost-sensitive 12 V systems where 24 V derating margin is acceptable. |
Compared with SMBJ24A and 1.5KE27A, the LDP24ARL delivers superior thermal robustness (Rth(j-a) = 15 °C/W), higher IFSM (500 A), and explicit ISO 7637-2 Pulse 5 validation - making it the only choice for mission-critical 24 V commercial vehicle ECUs requiring guaranteed clamping under thermal stress.
Availability
LDP24ARL is available at Aetrix Electronics and suitable for engine control units, body control modules, commercial vehicle telematics, and truck HVAC control units requiring stable component supply across extended automotive lifecycles.
Supply support for LDP24ARL 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in automotive, industrial, and power management solutions with vertical manufacturing and AEC-Q101 qualified product lines.
The LDP series is ST's dedicated automotive-grade TVS portfolio engineered for ISO 7637-2 compliance, targeting load dump and jump-start transient protection in 12 V and 24 V vehicle electrical architectures.
FAQ
What is the maximum clamping voltage of LDP24ARL under real-world operating conditions?
The maximum clamping voltage is 40 V, measured at 30 A peak pulse current and junction temperature of 85 °C - matching worst-case under-hood thermal conditions during ISO 7637-2 Pulse 5 testing. This value is confirmed in the Electrical Characteristics table and Fig. 1–2 curves, and accounts for both voltage overshoot and thermal derating.
Can LDP24ARL be used in 12 V automotive systems?
No - LDP24ARL is optimized for 24 V nominal systems. Its 24 V stand-off voltage (VRM) and 25–32 V breakdown range provide insufficient margin for 12 V applications, risking premature conduction and excessive leakage. ST recommends LDP12A or SMAJ12A for 12 V use cases.
Is the R6 package RoHS and REACH compliant?
Yes - the R6 package uses lead-free terminations and UL94-V0 compliant resin, meeting RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006. STMicroelectronics provides material declarations and substance compliance reports upon request for LDP24ARL.
How does LDP24ARL differ from generic TVS diodes like P6KE27A?
LDP24ARL differs in three verified ways: (1) It is explicitly tested and documented for ISO 7637-2 Pulse 5 (load dump), unlike P6KE27A; (2) It specifies VCL at 85 °C (not 25 °C), reflecting real under-hood operation; (3) Its R6 package has higher thermal mass and lower Rth(j-a) (15 °C/W vs ~30 °C/W), enabling higher sustained power handling.
LDP24ARL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- R-6, Axial
- Series:
- LDP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 24V
- Voltage - Breakdown (Min):
- 25V
- Voltage - Clamping (Max) @ Ipp:
- 40V
- Current - Peak Pulse (10/1000µs):
- 30A (8/20µs)
- Power - Peak Pulse:
- -
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 8000pF @ 1MHz
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- R-6
LDP24ARL FAQ
1.How can I place an order for LDP24ARL through Aetrix?
Please submit a Request for Quotation (RFQ) for LDP24ARL 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 LDP24ARL reliable?
The price and inventory of LDP24ARL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LDP24ARL is usually 5 days.
3.What payment methods are accepted for LDP24ARL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LDP24ARL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LDP24ARL?
LDP24ARL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LDP24ARL 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 LDP24ARL?
For technical support, including LDP24ARL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LDP24ARL requirements.
6.How does Aetrix verify that LDP24ARL is sourced from the original manufacturer or authorized distributors?
All LDP24ARL 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 LDP24ARL meets industry standards.
7.What is the process for return or replacement of LDP24ARL?
All LDP24ARL units undergo pre-shipment inspection (PSI). If there is an issue with LDP24ARL, 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 LDP24ARL part is unused and in its original packaging.
Return procedure for LDP24ARL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LDP24ARL Tags
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